320 results on '"HYPERGEOMETRIC functions"'
Search Results
2. Summation formulas generated by Hilbert space eigenproblem.
- Author
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Mali, Petar, Gombar, Sonja, Radošević, Slobodan, Rutonjski, Milica, Pantić, Milan, and Pavkov-Hrvojević, Milica
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INFINITE series (Mathematics) , *HYPERGEOMETRIC functions , *QUANTUM mechanics , *POTENTIAL well , *HILBERT space - Abstract
We demonstrate that certain classes of Schlömilch-like infinite series and series that include generalized hypergeometric functions can be calculated in closed form starting from a simple quantum model of a particle trapped inside an infinite potential well and using principles of quantum mechanics. We provide a general framework based on the Hilbert space eigenproblem that can be applied to different exactly solvable quantum models. Obtaining series from normalization conditions in well-defined quantum problems secures their convergence. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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3. Generalised unitary group integrals of Ingham-Siegel and Fisher-Hartwig type.
- Author
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Akemann, Gernot, Aygün, Noah, and Würfel, Tim R.
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UNITARY groups , *HAAR integral , *INTEGRALS , *HYPERGEOMETRIC functions , *EIGENVALUES , *MATHEMATICS , *DETERMINANTS (Mathematics) - Abstract
We generalise well-known integrals of Ingham-Siegel and Fisher-Hartwig type over the unitary group U(N) with respect to Haar measure, for finite N and including fixed external matrices. When depending only on the eigenvalues of the unitary matrix, such integrals can be related to a Toeplitz determinant with jump singularities. After introducing fixed deterministic matrices as external sources, the integrals can no longer be solved using Andréiéf's integration formula. Resorting to the character expansion as put forward by Balantekin, we derive explicit determinantal formulae containing Kummer's confluent and Gauß' hypergeometric function. They depend only on the eigenvalues of the deterministic matrices and are analytic in the parameters of the jump singularities. Furthermore, unitary two-matrix integrals of the same type are proposed and solved in the same manner. When making part of the deterministic matrices random and integrating over them, we obtain similar formulae in terms of Pfaffian determinants. This is reminiscent to a unitary group integral found recently by Kanazawa and Kieburg [J. Phys. A: Math. Theor. 51(34), 345202 (2018)]. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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4. Properties of κ-hypergeometric function and fractional derivatives.
- Author
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Dang, Shruti, Mittal, Ekta, Joshi, Sunil, and Menon, Mudita
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DIFFERENTIAL equations , *HYPERGEOMETRIC functions - Abstract
The object of this paper is to develop quardratic transformation of κ-hypergeometric differential equation and also develop new forms of quardratic transformation. Further we establish some properties of κ-hypergeometric function with κ-Caputo fractional derivative. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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5. Some unified integral formulae involving with general class of polynomials and generalized Hurwitz-Lerch zeta function.
- Author
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Bhadana, Krishna Gopal, Meena, Ashok Kumar, and Mishra, Vishnu Narayan
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ZETA functions , *FRACTIONAL calculus , *POLYNOMIALS , *HYPERGEOMETRIC functions , *INTEGRALS - Abstract
In the present paper, we explore some new formulae of fractional calculus, including the general class of polynomials given by Srivastava [5] and the generalized Hurwitz–Lerch zeta function given by Nadeem et al. [11]. The obtained results are in the form of hypergeometric function, which are made with the help of Hadamard product. We have also derived some important special cases from the main results. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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6. Generalized hypergeometric function and its applications to solving the equation of a beam with variable height by the Kelvin-Voight model.
- Author
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Hasanov, Anvar and Vahobov, Valijon
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HYPERGEOMETRIC functions , *HYPERGEOMETRIC series , *REPRESENTATION theory , *QUANTUM field theory , *QUANTUM groups , *EQUATIONS - Abstract
In this work we begin with a brief survey of the generalization of various Gaussian series introduced so far. One dimensional Gaussian series is Hypergeometric functions of several variables arise in quantum field theory as solutions of the Knizhnik-Zamolodchikov equations. These equations can be considered as generalized equations of hypergeometric type, and their solutions admit integral representations that generalize the classical Euler integrals for hypergeometric functions of one variable. Such an approach allows to connect special functions of the hypergeometric type with topical problems in the theory of representations of Lie algebras and quantum groups. [ABSTRACT FROM AUTHOR]
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- 2023
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7. Expansions of some double hypergeometric functions and their application to the solving boundary value problems.
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Ergashev, Tukhtasin G. and Djuraev, Norqul
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BOUNDARY value problems , *HYPERGEOMETRIC functions , *PROBLEM solving - Abstract
In this paper, we will find expansion formulas for 5 hypergeometric functions of two variables from Horn's list, which includes 34 functions, and for 11 of them, expansion formulas were previously known according to works of Burchnall and Chaundy. To solve the problem, we introduce operators that generalize the well-known Burchnall-Chaundy's operators, study the properties of these new operators, and apply them to finding expansion formulas. At the end of the paper, to give an example, we will show the application of the expansion formula for one of the five functions to determine the order of the singularity at the origin of the fundamental solution used in solving boundary value problem for the multidimensional Helmholtz's equation with one singular coefficient. [ABSTRACT FROM AUTHOR]
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- 2023
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8. Some other bilateral relations for generalized hypergeometric function.
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Srimannarayana, N., ChakradharaRao, M. V., Madhavi, M. Radha, and Satyanarayana, B.
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SPECIAL functions , *HYPERGEOMETRIC functions , *IMAGE processing , *THEORY of wave motion , *POLYNOMIALS - Abstract
Most of the results in special functions have extensive applications in modern engineering problems like wave propagation and image processing. In previous article, we discussed bilateral relations for Bn(α ,β)(x, y, v) with generalized Sylvester polynomial in modified form(MGSP) and quoted few applications as special cases. Now, in this article it has been discussed some more applications for it in continuation to it and these results are general in nature in their manifold. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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9. Certain classical properties for generalized hypergeometric polynomials.
- Author
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Bhagavan, V. S., Kameswari, P. L. Rama, and Srinivasulu, Tadikonda
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LAGUERRE polynomials , *LINEAR equations , *MATHEMATICAL physics , *GENERATING functions , *HYPERGEOMETRIC functions , *POLYNOMIALS - Abstract
In this paper, certain properties of newly defined generalized hypergeometric polynomials in two variables{Rn (β ;γ ; x, y)} have been derived, namely, recurrence relations of ascending and descending type, ordinarydifferential equation and linear generating function, which are essential to derive generating relations of various types from the group-theoretic method point of view. Furthermore, Laguerre polynomials of single and two variables, Meixner, Gottlieb and Krawtchouk polynomials are deduced as special cases, which arises in mathematical physics and communication engineering. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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10. Certain integral representations of hypergeometric polynomials.
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Kameswari, P. L. Rama, Bhagavan, V. S., and Kasyap, Varanasi L. V. S. K. B.
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JACOBI polynomials , *HYPERGEOMETRIC functions , *INTEGRAL representations , *POLYNOMIALS - Abstract
A study of few properties of 2-variable generalized hypergeometric polynomial(2VGHP) of the set Rn (β ; γ ; x, y) [1], as sum and product formulae and we derive this polynomial can be represented as some integral representations such as single and double integral representations. Many supplemental applications, as well as known and unknown hypergeometric functions can be obtained by these results. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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11. On a generalized fractional Fourier transform.
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Sharma, Komal Prasad and Bhargava, Alok
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ZETA functions , *HYPERGEOMETRIC functions , *FOURIER transforms , *BESSEL functions - Abstract
The purpose of this paper is to establish an expansion formula for the composition of a general class of functions and Srivastava polynomial function, V-function, and H-function by using fractional Fourier transform and also obtain several special results. The expansion formula being of a general nature can be transformed to yield various latest outcomes involving several frequently used functions, viz Bessel function, generalized hypergeometric function, Riemann Zeta function, Mittag-Leffler function, etc. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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12. A new extended Bessel-Maitland function.
- Author
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Gupta, Priyanka, Joshi, Sunil, and Mittal, Ekta
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INTEGRAL representations , *HYPERGEOMETRIC functions , *INTENTION , *FRACTIONAL calculus - Abstract
The intention of the current exploration is to create new extension of generalized Bessel-Maitland function. In addition, investigated several useful properties including integral representation of a new extended function of Laplace Transform, Whittaker Transform and various other transforms in terms of generalized Wright hypergeometric function. Certain belongings of the Riemann-Liouville fractional calculus connected with new extended Bessel-Maitland function are also examined. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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13. Painlevé V and confluent Heun equations associated with a perturbed Gaussian unitary ensemble.
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Yu, Jianduo, Chen, Siqi, Li, Chuanzhong, Zhu, Mengkun, and Chen, Yang
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INFORMATION theory , *SYSTEMS theory , *DIFFERENTIAL equations , *ORTHOGONAL polynomials , *DIFFERENCE equations , *EQUATIONS , *HYPERGEOMETRIC functions - Abstract
We discuss the monic polynomials of degree n orthogonal with respect to the perturbed Gaussian weight w (z , t) = | z | α ( z 2 + t) λ e − z 2 , z ∈ R , t > 0 , α > − 1 , λ > 0 , which arises from a symmetrization of a semi-classical Laguerre weight w Lag (z , t) = z γ (z + t) ρ e − z , z ∈ R + , t > 0 , γ > − 1 , ρ > 0. The weight wLag(z) has been widely investigated in multiple-input multi-output antenna wireless communication systems in information theory. Based on the ladder operator method, two auxiliary quantities, Rn(t) and rn(t), which are related to the three-term recurrence coefficients βn(t), are defined, and we show that they satisfy coupled Riccati equations. This turns to be a particular Painlevé V (PV, for short), i.e., P V λ 2 2 , − (1 − (− 1) n α) 2 8 , − 2 n + α + 2 λ + 1 2 , − 1 2 . We also consider the quantity σ n (t) ≔ 2 t d d t ln D n (t) , which is allied to the logarithmic derivative of the Hankel determinant Dn(t). The difference and differential equations satisfied by σn(t), as well as an alternative integral representation of Dn(t), are obtained. The asymptotics of the Hankel determinant under a suitable double scaling, i.e., n → ∞ and t → 0 such that s ≔ 4nt is fixed, are established. Finally, by using the second order difference equation satisfied by the recurrence coefficients, we obtain the large n full asymptotic expansions of βn(t) with the aid of Dyson's Coulomb fluid approach. By employing these results, the second differential equations satisfied by the orthogonal polynomials will be reduced to a confluent Heun equation. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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14. Energy analysis of the relativistic Klein-Gordon equation with Hyperbolic Scarf and Gendenstein III potentials using hypergeometric method.
- Author
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Naafi'ah, A., Suparmi, A., Cari, C., 'Aini, S. N., and Faniandari, S
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KLEIN-Gordon equation , *RELATIVISTIC energy , *THERMODYNAMICS , *SEPARATION of variables , *SCARVES , *HYPERGEOMETRIC functions - Abstract
The analytical solution of The Klein Gordon equation was solved using the hypergeometry method for Hyperbolic Scarf plus Gendenstein III potential. The Klein Gordon equation for spin symmetry is reduced to the differential of one-dimensional Schrodinger-like equation. The wave function and the corresponding energy eigenvalues equation are simply obtained using variable separation and hypergeometric method. The numerical result of relativistic energy is calculated by Matlab R2013. These results can be applied to determines the thermodynamic's properties of the system such as vibrational mean-energy, vibrational specific heat , and vibrational mean-free energy. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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15. Small protein number effects in stochastic models of autoregulated bursty gene expression.
- Author
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Jia, Chen and Grima, Ramon
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STOCHASTIC models , *GENE expression , *GAUSSIAN sums , *PROTEIN binding , *HYPERGEOMETRIC functions - Abstract
A stochastic model of autoregulated bursty gene expression by Kumar et al. [Phys. Rev. Lett. 113, 268105 (2014)] has been exactly solved in steady-state conditions under the implicit assumption that protein numbers are sufficiently large such that fluctuations in protein numbers due to reversible protein–promoter binding can be ignored. Here, we derive an alternative model that takes into account these fluctuations and, hence, can be used to study low protein number effects. The exact steady-state protein number distribution is derived as a sum of Gaussian hypergeometric functions. We use the theory to study how promoter switching rates and the type of feedback influence the size of protein noise and noise-induced bistability. Furthermore, we show that our model predictions for the protein number distribution are significantly different from those of Kumar et al. when the protein mean is small, gene switching is fast, and protein binding to the gene is faster than the reverse unbinding reaction. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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16. An application of subclasses of Goodman-Salagean-type harmonic univalent functions involving hypergeometric function.
- Author
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Hameed, Mustafa I., Shihab, Buthyna Najad, and Jassim, Kassim Abdulhameed
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HARMONIC functions , *UNIVALENT functions , *HYPERGEOMETRIC functions - Abstract
The main aim of this paper is to create ties between different kinds of documents. By adding a certain convolution operator involving hypergeometric functions, subclasses of harmonic univalent functions. In the open unit disk ℒ, we examine certain relations with Goodman-Salagean-Type harmonic univalent functions. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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17. Revisiting the Coulomb problem: A novel representation of the confluent hypergeometric function as an infinite sum of discrete Bessel functions.
- Author
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Alhaidari, A. D.
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BESSEL functions , *HYPERGEOMETRIC functions , *SCHRODINGER equation - Abstract
We use the tridiagonal representation approach to solve the radial Schrödinger equation for the continuum scattering states of the Coulomb problem in a complete basis set of discrete Bessel functions. Consequently, we obtain a new representation of the confluent hypergeometric function as an infinite sum of Bessel functions, which is numerically very stable and more rapidly convergent than another well-known formula. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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18. Exactly solvable piecewise analytic double well potential VD(x) = min[(x + d)2, (x − d)2] and its dual single well potential VS(x) = max[(x + d)2, (x − d)2].
- Author
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Sasaki, Ryu
- Subjects
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HARMONIC oscillators , *MIRROR symmetry , *EIGENFUNCTIONS , *EIGENVALUES , *HYPERGEOMETRIC functions , *QUANTUM tunneling - Abstract
By putting two harmonic oscillator potentials x2 side by side with a separation 2d, two exactly solvable piecewise analytic quantum systems with a free parameter d > 0 are obtained. Due to the mirror symmetry, their eigenvalues {E} for the even and odd parity sectors are determined exactly as the zeros of certain combinations of the confluent hypergeometric function F 1 1 of d and E, which are common to VD and VS but in two different branches. The eigenfunctions are the piecewise square integrable combinations of F 1 1 , the so-called U functions. By comparing the eigenvalues and eigenfunctions for various values of the separation d, vivid pictures unfold showing the tunneling effects between the two wells. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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19. Exactly solvable piecewise analytic double well potential VD(x) = min[(x + d)2, (x − d)2] and its dual single well potential VS(x) = max[(x + d)2, (x − d)2].
- Author
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Sasaki, Ryu
- Subjects
HARMONIC oscillators ,MIRROR symmetry ,EIGENFUNCTIONS ,EIGENVALUES ,HYPERGEOMETRIC functions ,QUANTUM tunneling - Abstract
By putting two harmonic oscillator potentials x
2 side by side with a separation 2d, two exactly solvable piecewise analytic quantum systems with a free parameter d > 0 are obtained. Due to the mirror symmetry, their eigenvalues {E} for the even and odd parity sectors are determined exactly as the zeros of certain combinations of the confluent hypergeometric function F 1 1 of d and E, which are common to VD and VS but in two different branches. The eigenfunctions are the piecewise square integrable combinations of F 1 1 , the so-called U functions. By comparing the eigenvalues and eigenfunctions for various values of the separation d, vivid pictures unfold showing the tunneling effects between the two wells. [ABSTRACT FROM AUTHOR]- Published
- 2023
- Full Text
- View/download PDF
20. Explicit solutions and geometric visualization of the solutions of several classes of nonlinear Schrödinger equations arising in physics.
- Author
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Popivanov, Petar and Slavova, Angela
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NONLINEAR Schrodinger equation , *SCHRODINGER equation , *HYPERGEOMETRIC functions , *ELLIPTIC functions , *SINE-Gordon equation , *PHYSICS , *VISUALIZATION , *SOLITONS - Abstract
This paper deals with three classes of nonlinear Schrödinger equations (NLSE) having general polynomial nonlinearities. We find travelling wave solutions of soliton type (smooth solitons, peakons and cuspons), periodic ones (smooth, peakons and cuspons) and kinks. In the case of some special polynomials the solutions are expressed up to the inverse map by Gauss and Appell's hypergeometric functions, by some elliptic functions of Jacobi and Weierstrass types etc. In each case the above mentioned solutions of NLSE are obtained into integral form. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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21. The plane-wave primary reflection response from an impedance gradient interface.
- Author
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Amundsen, Lasse, Ursin, Bjørn, and Landrø, Martin
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FERMI-Dirac distribution , *HYPERGEOMETRIC functions , *BORN approximation , *GAUSSIAN function , *REFLECTANCE , *REACTION-diffusion equations , *HYPERGEOMETRIC series - Abstract
A weak scattering model that allows prediction of the one-dimensional acoustic plane wave primary reflection response from an impedance gradient interface is described. The velocity and density gradient profiles are represented by a smooth approximation to the Heaviside function of the Fermi–Dirac distribution type. The profiles are described by the velocities and densities at minus and plus infinity, the reference depth of the gradient interface, and its smoothness. The primary response is derived by using the Bremmer series to reduce a generally complex reflection problem to the simpler one of the primary reflections which is a valid solution for small impedance contrasts. The reflection response can be expressed in terms of the Appellian hypergeometric functions of two variables of the first kind and Gaussian hypergeometric functions. When the reflection response is evaluated at sufficiently large distance above the reference depth, the Appellian functions are reduced to Gaussian hypergeometric functions. In the Born approximation, the reflection response simplifies. In the limit of zero frequency, the reflection coefficient in the small impedance contrast approximation can be related to the classic reflection coefficient for two impedance layers in welded contact. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
22. Comparison of Bohr and Hulthén hydrogen atomic energy levels using the time-independent solution of Schrodinger's equation and confluent hypergeometric function.
- Author
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Putra, G. S. and Akhsan, H.
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HYDROGEN as fuel , *ATOMIC hydrogen , *SCHRODINGER equation , *NUCLEAR energy , *HYPERGEOMETRIC functions , *HYDROGEN atom - Abstract
The energy for each level of the hydrogen atom was triggered by Neils Bohr, where the amount of energy decreases at every level of orbit. The value of energy depends on the principal quantum number which only applies to atoms with the s subshell of an atom with the same characteristics as the hydrogen atom. With the advancement of science, specifically in quantum physics, many potential equations aimed to solve the time-independent Schrodinger equation with the solution of the estimated value of energy. One of the applicable potential equations is the Hulthen potential which is explained about the potential at a small distance and only applies to atoms and micro-scale objects in physics and only has a solution at the azimuth quantum number value l = 0 or groups of atoms subshell s. Using the confluent hypergeometric function, the combination of the Hulthén potential and time-independent Schrödinger equation generates the estimated energy value of the hydrogen atom level, which can be used as a comparison with the estimated energy value of Bohr's hydrogen atom. This study found that the comparison between Hulthén and Bohr energy level lies in the same ratio 1:1 [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
23. A representation of the Dunkl oscillator model on curved spaces: Factorization approach.
- Author
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Najafizade, Amene, Panahi, Hossein, Chung, Won Sang, and Hassanabadi, Hassan
- Subjects
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CARTESIAN plane , *LAGUERRE polynomials , *FACTORIZATION , *SEPARATION of variables , *CARTESIAN coordinates , *JACOBI polynomials , *HYPERGEOMETRIC functions - Abstract
In this paper, we study the Dunkl oscillator model in a generalization of superintegrable Euclidean Hamiltonian systems to the two-dimensional curved ones with a m:n frequency ratio. This defined model of the two-dimensional curved systems depends on a curvature/deformation parameter of the underlying space involving reflection operators. The curved Hamiltonian H κ admits the separation of variables in both geodesic parallel and polar coordinates, which generalizes the Cartesian coordinates of the plane. Similar to the behavior of the Euclidean case, which is the κ → 0 limit case of the curved space, the superintegrability of a curved Dunkl oscillator is naturally understood from the factorization approach viewpoint in that setting. Therefore, their associated sets of polynomial constants of motion (symmetries) as well as algebraic relations are obtained for each of them separately. The energy spectrum of the Hamiltonian H κ and the separated eigenfunctions are algebraically given in terms of hypergeometric functions and in the special limit case of null curvature occur in the Laguerre and Jacobi polynomials. Finally, the overlap coefficients between the two bases of the geodesic parallel and polar coordinates are given by hypergeometric polynomials. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
24. Finite-part integration in the presence of competing singularities: Transformation equations for the hypergeometric functions arising from finite-part integration.
- Author
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Villanueva, Lloyd L. and Galapon, Eric A.
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STIELTJES transform , *STIELTJES integrals , *EQUATIONS , *INTEGRAL representations , *HYPERGEOMETRIC functions , *HYPERGEOMETRIC series - Abstract
Finite-part integration is a recently introduced method of evaluating convergent integrals by means of the finite-part of divergent integrals [E. A. Galapon, Proc. R. Soc., A 473, 20160567 (2017)]. Current application of the method involves exact and asymptotic evaluation of the generalized Stieltjes transform ∫ 0 a f (x) / (ω + x) ρ d x under the assumption that the extension of f(x) in the complex plane is entire. In this paper, the method is elaborated further and extended to accommodate the presence of competing singularities of the complex extension of f(x). Finite-part integration is then applied to derive consequences of known Stieltjes integral representations of the Gauss function and the generalized hypergeometric function that involve Stieltjes transforms of functions with complex extensions having singularities in the complex plane. Transformation equations for the Gauss function are obtained from which known transformation equations are shown to follow. In addition, building on the results for the Gauss function, transformation equations involving the generalized hypergeometric function 3F2 are derived. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
25. Solution of Bohr Mottelson equation for modified wood Saxon potential using the hypergeometric method.
- Author
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Permatahati, L. K., Suparmi, A., Cari, C., Andaresta, W., Purnama, Budi, Nugraha, Dewanta Arya, and Anwar, Fuad
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ATOMIC nucleus , *SPHERICAL coordinates , *PHASE transitions , *HARMONIC oscillators , *WAVE functions , *HYPERGEOMETRIC functions - Abstract
The Bohr Mottelson model investigates the collective behavior of atomic nucleus [1]. The collective models are the combination of liquid drop model and shell model [2]. It is used to describes rotational and vibrational of the nucleus and also the deformed nucleus that corresponds to the excitation energy [3]. By solving the Bohr Mottelson, properties and mechanism involved in atomic nucleus can be obtained, such as energy spectrum and shape phase transitions [4]. The Bohr Mottelson has been solved for modified Davidson potential [5], Eckart potential [2], Kratzer potential [6], Killingbeck potential [7], Hulthen plus ring shape potential and three dimensional harmonic oscillator potential [8]. This study, the Bohr Mottelson equation is solved for modified Wood Saxon potential in spherical coordinates. By using hypergeometric method, the energy and the wave function of Bohr Mottelson equation were obtained. Numerically, the energy spectrum was calculated by applying energy equation in MATLAB R2013A software. While, the wave functions were investigated using hypergeometric method. The results show that the energy spectrum was increased by the increase of quantum numbers (n and L). The unnormalized wave functions were expressed in hypergeometric terms. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
26. Solution of fractional kinetic equations by using integral transform.
- Author
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Agarwal, Garima, Mathur, Ruchi, and Sharma, Rajesh
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INTEGRAL equations , *HYPERGEOMETRIC functions , *INTEGRAL transforms - Abstract
In the present article the author develop the solution of Fractional Kinetic Equation in a new and further generalized form by involving the ζ-Gauss Hypergeometric Functions as Kinetic Equations are having great importance in certain astrophysical problems. The change of chemical composition in star like the sun can be computed by this new generalized form of Kinetic equations. The main fold generality of the ζ-Gauss Hypergeometric Functions is discussed in terms of the solution of the Fractional Kinetic Equation. Special case involving the Gauss Hypergeometric function are also considered. The obtained results imply more precisely the known results and easily computable solution can also be established by the given results. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
27. Fractional Calculus of Some “New” but Not New Special Functions: K-, Multi-index-, and S-Analogues.
- Author
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Kiryakova, Virginia
- Subjects
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SPECIAL functions , *FRACTIONAL calculus , *HYPERGEOMETRIC functions , *BESSEL functions - Abstract
This paper is a continuation, as Part 2, of the recent author’s papers [18], [19], [20], where we have emphasized on our general and unified approach to evaluate operators of fractional calculus of a very general class of special functions. Namely, we have results for images of the Wright generalized hypergeometric functions (W. g.h.f.-s) under the operators of classical and generalized fractional calculus. Thus, great part of results published by other authors in numerous papers (for part of them - see references in the above mentioned 3 papers and also, herein) come as immediate particular cases. It is because the special functions considered there are all of them Wright g.h.f.-s, and the FC operators like the Riemann-Liouville (RL), Erdélyi-Kober (EK), Saigo, Marichev-Saigo-Maeda (MSM), etc., are all of them particular cases of the operators of Generalized Fractional Calculus (GFC), [11]. We gave previously long list of illustrative examples for the efficiency of the general approach, and now continue it. Recently, some authors repeated the job to evaluate FC operators of some special functions which they introduced and considered as “new” ones. Among them are some examples of the so-called k-analogues of the Bessel and Mittag-Leffler functions, generalized multi-index Bessel and Mittag-Leffler functions, K- and M-series and S -functions. In Section 5 we show that all these are just cases, again, of the Wright generalized hypergeometric function. Then, the results provided by the mentioned authors can come easily from our general ones. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
28. Solutions for the Lévy-Leblond or parabolic Dirac equation and its generalizations.
- Author
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Bao, Sijia, Constales, Denis, De Bie, Hendrik, and Mertens, Teppo
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DIRAC operators , *DIRAC equation , *SPHERICAL functions , *HYPERGEOMETRIC functions , *SPHERICAL harmonics , *GENERALIZATION , *PARABOLIC operators - Abstract
In this paper, we determine solutions for the Lévy-Leblond operator or a parabolic Dirac operator in terms of hypergeometric functions and spherical harmonics. We subsequently generalize our approach to a wider class of Dirac operators depending on 4 parameters. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
29. On collisional free-free photon absorption in warm dense matter.
- Author
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Meyer-ter-Vehn, J. and Ramis, R.
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LIGHT absorption , *ELECTRON-ion collisions , *ELECTRON distribution , *MATTER , *HYPERGEOMETRIC functions , *ELECTRON gas , *PHOTONS - Abstract
The rate of photon absorption in warm dense matter induced by free-free electron-ion collisions is derived from Sommerfeld's cross section for nonrelativistic bremsstrahlung emission, making use of detailed balance relations. Warm dense matter is treated as a metal-like state in the approximation of a uniform degenerate electron gas and a uniform ion background. Total absorption rates are averaged over the electron Fermi distribution. A closed expression is obtained for the absorption rate, depending on temperature, density, and photon energy, which scales with ion charge Z. It is evaluated numerically for the full nonrelativistic parameter space, which requires different representations of the hypergeometric functions involved. The results are valid for photon frequencies larger than the plasma frequency of the medium. They are compared with approximate formulas in various asymptotic regions. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
30. Quantum statistical properties of multiphoton hypergeometric coherent states and the discrete circle representation.
- Author
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Arjika, S., Calixto, M., and Guerrero, J.
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HILBERT space , *HYPERGEOMETRIC functions , *COHERENT states , *SCHRODINGER operator , *CIRCLE , *HERMITE polynomials - Abstract
We review the definition of hypergeometric coherent states, discussing some representative examples. Then, we study mathematical and statistical properties of hypergeometric Schrödinger cat states, defined as orthonormalized eigenstates of kth powers of nonlinear f-oscillator annihilation operators, with f of the hypergeometric type. These "k-hypercats" can be written as an equally weighted superposition of hypergeometric coherent states ∣zl⟩, l = 0, 1, ..., k − 1, with zl = ze2πil/k a kth root of zk, and they interpolate between number and coherent states. This fact motivates a continuous circle representation for high k. We also extend our study to truncated hypergeometric functions (finite dimensional Hilbert spaces), and a discrete exact circle representation is provided. We also show how to generate k-hypercats by amplitude dispersion in a Kerr medium and analyze their generalized Husimi Q-function in the super- and sub-Poissonian cases at different fractions of the revival time. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
31. Use of Quantum Calculus Approach In Mathematical Sciences and Its Role In Geometric Function Theory.
- Author
-
Ahuja, Om P. and Çetinkaya, Asena
- Subjects
- *
GEOMETRIC function theory , *THETA functions , *UNIVALENT functions , *CALCULUS , *ANALYTIC number theory , *HYPERGEOMETRIC functions , *GAMMA functions - Abstract
The study of 300 years old history of quantum calculus or q−calculus or q−disease, since the Bernoulli and Euler, is often considered to be one of the most difficult subjects to engage in mathematics. Nowadays there is a rapid growth of activities in the area of q−calculus due to its applications in various fields such as mathematics, mechanics, and physics. The history of study of q−calculus may be illustrated by its wide variety of applications in quantum mechanics, analytic number theory, theta functions, hypergeometric functions, theory of finite differences, gamma function theory, Bernoulli and Euler polynomials, Mock theta functions, combinatorics, umbral calculus, multiple hypergeometric functions, Sobolev spaces, operator theory, and more recently in the theory of analytic and harmonic univalent functions. In q−calculus, we are generally interested in q−analogues that arise naturally, rather than in arbitrarily contriving q−analogues of known results. While focusing on excitement and romance with development of q−calculus and its applications in certain fields of mathematical sciences and physics, we will also look at q−analogues of some of the recent results in geometric function theory and, in particular, theory of analytic and harmonic univalent functions in the unit disc. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
32. Generalized Special Solutions to Modified Kompaneets Equation.
- Author
-
Mihu, Denisa-Andreea, Dariescu, Marina-Aura, and Amanoloaei, Gheorghe
- Subjects
- *
PHOTON scattering , *SPECTRUM analysis , *NONLINEAR theories , *DISTRIBUTION (Probability theory) , *HYPERGEOMETRIC functions - Abstract
In the stationary regime, configurations of corrected Kompaneets equation have been analyzed within a theoretically approach and the spectrum evolution for the scattered photons has been derived. A particular attention has been granted to the impact of the nonlinearity on the spectrum distorsions, mainly to the closed form special solutions expressed in terms of Heun functions. In the nonrelativistic limit, stationary solutions of the Kompaneets equation bring into attention the Heun double confluent functions. On the other side, when various type of corrections come into play, the photon distribution functions are governed by the Heun triconfluent functions. In magnetar's magnetosphere, where the resonant Compton scattering is more important than the Compton one, the photon number density can be written in terms of Hermite and confluent hypergeometric functions. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
33. A New Exact Solution for Convective Flows of a Rotating Viscous Incompressible Fluid.
- Author
-
Prosviryakov, E. Yu.
- Subjects
- *
CONVECTIVE flow , *VISCOUS flow , *INCOMPRESSIBLE flow , *FLUID dynamics , *HYPERGEOMETRIC functions - Abstract
A new exact solution of the overdetermined system of Oberbeck-Boussinesq equations is obtained. The shear flow of a non-uniformly rotating viscous incompressible fluid is considered. It is shown that the exact solutions of Oberbeck-Boussinesq equations are expressed by means of hypergeometric functions. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
34. Effective transport properties of arrays of multicoated or graded spheres with spherically transversely isotropic constituents.
- Author
-
Hsin-Yi Kuo and Tungyang Chen
- Subjects
- *
ELECTRIC conductivity , *ISOTROPY subgroups , *RAYLEIGH scattering , *HYPERGEOMETRIC series , *HYPERGEOMETRIC functions - Abstract
This work is concerned with the determination of the effective conductivity and potential fields of a periodic array of spherically transversely isotropic spheres in an isotropic matrix. We generalize Rayleigh’s method to account for the periodic arrangements of the inclusions. The inclusions considered in the formulation could be multicoated, generally graded, or exponentially graded. For the multicoated spheres, we derive a recurrence procedure valid for any number of coatings. We show that a (2×2) array alone can mathematically represent the effect of the multiple coatings. For a graded inclusion, the method of Frobenius is adopted to obtain series solutions for the potential fields. For an exponentially graded sphere, we show that the admissible potential field in the inclusion admits a closed-form expression in terms of confluent hypergeometric functions. All these types of inclusions can be characterized by simple scalar coefficients Tl in the estimate of effective conductivities. Simple orthorhombic, body-centered orthorhombic, and face-centered orthorhombic lattice structures are considered in the formulation. Numerical results are presented for selected systems with sufficient accuracy. We demonstrate that the anisotropy of the spheres can strongly influence the potential fields inside the inclusions. The effects of spherical anisotropy, multiple coatings, and the grading factor are also studied. [ABSTRACT FROM AUTHOR]
- Published
- 2006
- Full Text
- View/download PDF
35. Hypergeometric Method for Klein-Gordon Equation with Trigonometric Poschl-Teller and Trigonometric Scarf II Potentials.
- Author
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Dianawati, Dyah Ayu, Suparmi, A., Cari, C., Anggraini, Dian, Ulfa, Uli, Fitri, Dewi Cahya, and Mega, Prayogi
- Subjects
- *
HYPERGEOMETRIC functions , *TRIGONOMETRIC functions , *QUANTUM mechanics , *DIFFERENTIAL equations , *QUANTUM numbers - Abstract
The Hypergeometric method was used to solve the Klein-Gordon equation with Trigonometric Poschl-Teller and Trigonometric Scarf II potentials. By using variable and parameter substitutions, Klein-Gordon equation for spin symmetry case was reduced into second-order differential equation. The radial part of Klein-Gordon equation with radial trigonometric Poschl-Teller potentials was solved in the scheme of centrifugal approximation by using hypergeometric method. The relativistic energy equation was obtained and calculated numerically by using Matlab R2013 software. On the other hand, wave function equation was obtained and visualized by Matlab R2013 software. The energy value depends on n, k, and μ values, while the quantum number and mass have effect for distribution of particle in visualization of wave function. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
36. Solution of Schrodinger Equation with q-Deformed Momentum in Coulomb Potential using Hypergeometric Method.
- Author
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Dianawati, Dyah Ayu, Suparmi, A., and Cari, C.
- Subjects
- *
SCHRODINGER equation , *COULOMB potential , *HYPERGEOMETRIC functions , *WAVE functions , *QUANTUM theory - Abstract
The Hypergeometric method was used to describe radial equations by probeneus approaximation at a singular regular point. Schrodinger equations radial part was reduced into differential equations with variable substitution. By using q-deformed momentum parameter and Coulomb potential as well as variable substitution, the second order of Schrodinger equation with centrifugal approach for q-deformed momentum in Coulomb potential can be solved with Hypergeometric method. The analytical result of energy spectrum and wave function with quantum number and qdeformed variations, while the numerical result for energy spectrum can be calculated by using Matlab 2013 software. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
37. Special Functions and Heat Polynomials for the Solution of Free Boundary Problems.
- Author
-
Kharin, Stanislav N.
- Subjects
- *
BOUNDARY value problems , *HEAT equation , *HYPERGEOMETRIC functions , *INTEGRAL functions , *POLYNOMIALS - Abstract
The method of special functions and heat polynomials for the solution of problems for the heat equation in domains with moving boundaries is developed for the generalized and axisymmetric heat equations. The corresponding generating and associated functions are introduced. Examples of application of this method for the solution of some problems are presented. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
38. Lower Bound Estimation for Eigenvalues for Many Interval BVP's with Eigenparameter Dependent Boundary Conditions.
- Author
-
Olğar, Hayati, Muhtarov, Fahreddin S., and Mukhtarov, Oktay Sh.
- Subjects
- *
BOUNDARY value problems , *STURM-Liouville equation , *DIFFERENTIAL equations , *CHEBYSHEV polynomials , *HYPERGEOMETRIC functions - Abstract
The present paper deals with multi-interval Sturm-Liouville equations with eigenparameter dependent boundary-transmission conditions. Such type of problems cannot be treated with the usual techniques within the standard framework os classical Sturmian theory. It is well-known that any eigenvalue of the classical Sturm-Liouville problems can be related to its eigenfunction by the Rayleigh quotient and some useful results can be obtained from the Rayleigh quotient without solving the differential equation. For instance, it can be quite useful in estimating the eigenvalues. In this study we present a new technique for investigation some computational aspects of the eigenvalues. Particularly, we give an operator-pencil formulation of the problem and establish lower bound estimation for eigenvalues by using modified Rayleigh quotient. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
39. Discrete Fractional Solutions of an Associated Laguerre Equation.
- Author
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Yılmazer, Resat and Bas, Erdal
- Subjects
- *
FRACTIONAL calculus , *LAGUERRE geometry , *OPERATOR theory , *INITIAL value problems , *HYPERGEOMETRIC functions , *FINITE differences - Abstract
In this article, we will give theorems for the discrete fractional solutions of the homogeneous and nonhomogeneous associated Laguerre equation by using discrete fractional nabla operator. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
40. Discrete Fractional Solutions of a Legendre Equation.
- Author
-
Yılmazer, Resat
- Subjects
- *
FRACTIONAL calculus , *LEGENDRE'S functions , *DIFFERENTIAL equations , *BESSEL functions , *LINEAR differential equations , *HYPERGEOMETRIC functions , *OPERATOR theory - Abstract
One of the most popular research interests of science and engineering is the fractional calculus theory in recent times. Discrete fractional calculus has also an important position in fractional calculus. In this work, we acquire new discrete fractional solutions of the homogeneous and non homogeneous Legendre differential equation by using discrete fractional nabla operator. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
41. Linearization and Krein-like functionals of hypergeometric orthogonal polynomials.
- Author
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Dehesa, J. S., Moreno-Balcázar, J. J., and Toranzo, I. V.
- Subjects
- *
LINEAR systems , *KREIN spaces , *HYPERGEOMETRIC functions , *FUNCTIONALS , *QUANTUM theory - Abstract
The Krein-like r-functionals of the hypergeometric orthogonal polynomials {pn(x)}, with the kernel of the form x s [ ω (x) ] β p m 1 (x) ... p m r (x) being ω(x) the weight function on the interval Δ ∈ R , are determined by means of the Srivastava linearization method. The particular 2-functionals, which are particularly relevant in quantum physics, are explicitly given in terms of the degrees and the characteristic parameters of the polynomials. They include the well-known power moments and the novel Krein-like moments. Moreover, various related types of exponential and logarithmic functionals are also investigated. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
42. Use of fractional calculus to evaluate some improper integrals of special functions.
- Author
-
Kiryakova, Virginia
- Subjects
- *
FRACTIONAL calculus , *INTEGRALS , *SPECIAL functions , *HYPERGEOMETRIC functions , *OPERATOR theory - Abstract
In this paper we point out on some author's ideas and developments, combined with few basic classical results, that show how one can do the task posed in the title at once, and in rather general case: for both operators of generalized fractional calculus and generalized hypergeometric functions. In this way, the greater part of the results in the publications mentioned in References (and many others not in this limited list) are well predicted and come just as very special cases of the discussed general scheme. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
43. Construction of Normal-Regular Decisions of Bessel Typed Special System.
- Author
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Tasmambetov, Zhaksylyk N. and Talipova, Meiramgul Zh.
- Subjects
- *
NUMERICAL solutions to partial differential equations , *HYPERGEOMETRIC functions , *DEGENERATE differential equations , *BESSEL functions , *MATHEMATICAL singularities - Abstract
Studying a special system of differential equations in the separate production of the second order is solved by the degenerate hypergeometric function reducing to the Bessel functions of two variables. To construct a solution of this system near regular and irregular singularities, we use the method of Frobenius-Latysheva applying the concepts of rank and antirank. There is proved the basic theorem that establishes the existence of four linearly independent solutions of studying system type of Bessel. To prove the existence of normal-regular solutions we establish necessary conditions for the existence of such solutions.The existence and convergence of a normally regular solution are shown using the notion of rank and antirank. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
44. Solution of Degenerate Hypergeometric System of Horn Consisting of Three Equations.
- Author
-
Tasmambetov, Zhaksylyk N. and Zhakhina, Ryskul U.
- Subjects
- *
HYPERGEOMETRIC functions , *DEGENERATE differential equations , *NUMERICAL solutions to partial differential equations , *FROBENIUS groups , *ORTHOGONAL polynomials - Abstract
The possibilities of constructing normal-regular solutions of a system consisting of three partial differential equations of the second order are studied by the Frobenius-Latysheva method. The method of determining unknown coefficients is shown and the relationship of the studied system with the system, which solution is Laguerre's polynomial of three variables is indicated. The generalization of the Frobenius-Latysheva method to the case of a system consisting of three equations makes it possible to clarify the relationship of such systems, which solutions are special functions of three variables. These systems include the functions of Whittaker and Bessel, 205 special functions of three variables from the list of M.Srivastava and P.W. Carlsson, as well as orthogonal polynomials of three variables. All this contributes to the further development of the analytic theory of systems consisting of three partial differential equations of the second order. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
45. A Linear Operator and Associated Families of Meromorphically q-Hypergeometric Functions functions.
- Author
-
Challab, Khalid A., Darus, Maslina, and Ghanim, Firas
- Subjects
- *
LINEAR operators , *MEROMORPHIC functions , *HYPERGEOMETRIC functions , *MATHEMATICAL bounds , *CONVEX domains - Abstract
In this article, we derive a new class of meromorphically analytic functions, which is defined by means of a Hadamard product (or convolution) involving some suitably normalized meromorphically q-Hypergeometric functions. A characterization property giving the coefficient bounds is obtained. The other related properties, which are studied in this paper, include distortion and the radii of meromorphic starlikeness and meromorphic convexity. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
46. Hypergeometric Steady Solution of Hydromagnetic Nano Liquid Film Flow over an Unsteady Stretching Sheet.
- Author
-
Metri, Prashant G., Narayana, Mahesha, and Silvestrov, Sergei
- Subjects
- *
MAGNETOHYDRODYNAMICS , *LIQUID films , *UNSTEADY flow , *NONLINEAR equations , *PARTIAL differential equations , *NUSSELT number , *HYPERGEOMETRIC functions - Abstract
In this paper, we examine the hydromagnetic boundary layer flow and heat transfer characteristics of a laminar nanoliquid film over an unsteady stretching sheet is presented. The highly nonlinear partial differential equations governing flow and heat transport are simplified using similarity transformation. The analytical solutions of the resulting ODEs are obtained for some special case of nano liquid film using hypergeometric power series functions, and from which the analytical solutions of the original problem are presented. The influence of pertinent parameters such as the magnetic parameter, the solid volume fraction of nanoparticles and the type of nanofluid on the flow, heat transfer, Nusselt number and skin friction coefficient is discussed analytically. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
47. A New Class Of Meromorphically Analytic Functions With Applications To The Generalized Hypergeometric Functions.
- Author
-
Albehbah, Mostafa and Darus, Maslina
- Subjects
- *
ANALYTIC functions , *MEROMORPHIC functions , *SET theory , *GENERALIZABILITY theory , *HYPERGEOMETRIC functions , *MATHEMATICAL bounds - Abstract
We introduce a new subclass of meromorphically analytic functions, which is defined by means of a Hadamard product or convolution. A characterization property such as the coefficient bound is obtained for this class. The other related properties, which are investigated in this paper, include the distortion and the radius of starlikeness. We also consider several applications of our main results to the generalized hypergeometric functions. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
48. Irregular conformal blocks and connection formulae for Painlevé V functions.
- Author
-
Lisovyy, O., Nagoya, H., and Roussillon, J.
- Subjects
- *
PAINLEVE equations , *FREDHOLM equations , *ORDINARY differential equations , *HYPERGEOMETRIC functions , *MATHEMATICAL physics - Abstract
We prove a Fredholm determinant and short-distance series representation of the Painlevé V tau function τ t associated with generic monodromy data. Using a relation of τ t to two different types of irregular c = 1 Virasoro conformal blocks and the confluence from Painlevé VI equation, connection formulas between the parameters of asymptotic expansions at 0 and i∞ are conjectured. Explicit evaluations of the connection constants relating the tau function asymptotics as t → 0, +∞, i∞ are obtained. We also show that irregular conformal blocks of rank 1, for arbitrary central charge, are obtained as confluent limits of the regular conformal blocks. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
49. Weighted Hurwitz numbers and topological recursion: An overview.
- Author
-
Alexandrov, A., Chapuy, G., Eynard, B., and Harnad, J.
- Subjects
- *
HURWITZ polynomials , *TOPOLOGY , *RECURSION theory , *HYPERGEOMETRIC functions , *GENERATING functions , *GRASSMANN manifolds - Abstract
Multiparametric families of hypergeometric τ-functions of KP or Toda type serve as generating functions for weighted Hurwitz numbers, providing weighted enumerations of branched covers of the Riemann sphere. A graphical interpretation of the weighting is given in terms of constellations mapped onto the covering surface. The theory is placed within the framework of topological recursion, with the Baker function at t = 0 shown to satisfy the quantum spectral curve equation, whose classical limit is rational. A basis for the space of formal power series in the spectral variable is generated that is adapted to the Grassmannian element associated with the τ-function. Multicurrent correlators are defined in terms of the τ-function and shown to provide an alternative generating function for weighted Hurwitz numbers. Fermionic vacuum state expectation value representations are provided for the adapted bases, pair correlators, and multicurrent correlators. Choosing the weight generating function as a polynomial and restricting the number of nonzero “second” KP flow parameters in the Toda τ-function to be finite implies a finite rank covariant derivative equation with rational coefficients satisfied by a finite “window” of adapted basis elements. The pair correlator is shown to provide a Christoffel-Darboux type finite rank integrable kernel, and the WKB series coefficients of the associated adjoint system are computed recursively, leading to topological recursion relations for the generators of the weighted Hurwitz numbers. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
50. Re-expansion method for generalized radiation impedance of a circular aperture in an infinite flange.
- Author
-
Homentcovschi, Dorel and Bercia, Romeo
- Subjects
- *
SOUND , *ACOUSTIC radiation , *OPTICAL apertures , *POLYNOMIALS , *HYPERGEOMETRIC functions - Abstract
The paper applies the re-expansion method to analyze the sound radiation from a flanged circular pipe. The axial velocity in the aperture is expressed by means of some orthogonal polynomials combining the properties of Jacobi's polynomials and hypergeometric functions, and also accounting for the velocity singularities at the edge points of the aperture. This makes it possible to reveal the physical parameters of the problem with a very limited number of terms. Besides the classical case when the flange covers the whole plane outside the pipe, the method also permits one to study also the case of the flange extending with zero thickness over a part of the circular pipe. Finally, the paper includes the extension of the results beyond the plane wave region achieving good accuracy and convergence. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
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