90 results on '"Tian-Jun Li"'
Search Results
52. General wall crossing formula
- Author
-
A. Liu and Tian-Jun Li
- Subjects
General Mathematics ,Mathematical analysis ,Wall-crossing ,Mathematics - Published
- 1995
53. Symplectic structure on ruled surfaces and a generalized adjunction formula
- Author
-
A. Liu and Tian-Jun Li
- Subjects
Symplectic vector space ,Pure mathematics ,General Mathematics ,Adjunction formula ,Mathematical analysis ,Symplectic representation ,Symplectomorphism ,Moment map ,Symplectic matrix ,Symplectic geometry ,Mathematics ,Symplectic manifold - Published
- 1995
54. Virtual Betti numbers and virtual symplecticity of 4-dimensional mapping tori
- Author
-
Yi Ni and Tian-Jun Li
- Subjects
Torus bundle ,Fiber (mathematics) ,Betti number ,General Mathematics ,Circle bundle ,010102 general mathematics ,Physics::Optics ,Geometric Topology (math.GT) ,01 natural sciences ,Mathematics::Geometric Topology ,Manifold ,Combinatorics ,Mathematics - Geometric Topology ,0103 physical sciences ,Mapping torus ,FOS: Mathematics ,Kodaira dimension ,010307 mathematical physics ,Mathematics::Differential Geometry ,0101 mathematics ,Mathematics::Symplectic Geometry ,Symplectic geometry ,Mathematics - Abstract
In this note, we compute the virtual first Betti numbers of 4-manifolds fibering over $S^1$ with prime fiber. As an application, we show that if such a manifold is symplectic with nonpositive Kodaira dimension, then the fiber itself is a sphere or torus bundle over $S^1$. In a different direction, we prove that if the 3-dimensional fiber of such a 4-manifold is virtually fibered then the 4-manifold is virtually symplectic unless its virtual first Betti number is 1., Comment: 17 pages
- Published
- 2012
- Full Text
- View/download PDF
55. W-boson electric dipole moment in the SU(3)c×SU(3)L×U(1)Xmodel
- Author
-
Tian-Jun Li and Chao-Shang Huang
- Subjects
Physics ,Particle physics ,Electric dipole moment ,Computer Science::Information Retrieval ,High Energy Physics::Phenomenology ,Higgs boson ,Lie group ,Elementary particle ,Symmetry group ,U-1 ,Upper and lower bounds ,Boson - Abstract
We diagonalize the mass matrix of Higgs bosons and obtain its eigenvalues and eigenstates in the SU(3)[sub [ital c]][times]SU(3)[sub [ital L]][times]U(1)[sub [ital X]] model. We estimate in detail the size of the electric dipole moment [ital d][sub [ital W]] of the [ital W] boson which comes from exchanging neutral and charged Higgs bosons in this model. [ital d][sub [ital W]] remains within the present upper bound of 10[sup [minus]20][ital e] cm, even for the values of relative phases of the VEV's such that [ital CP] violation is maximal.
- Published
- 1994
56. On the J-anti-invariant cohomology of almost complex 4-manifolds
- Author
-
Tedi Draghici, Weiyi Zhang, and Tian-Jun Li
- Subjects
Mathematics - Differential Geometry ,Algebra ,Pure mathematics ,Integrable system ,Differential Geometry (math.DG) ,Mathematics - Symplectic Geometry ,General Mathematics ,FOS: Mathematics ,Symplectic Geometry (math.SG) ,Invariant (mathematics) ,Cohomology ,Mathematics - Abstract
For a compact almost complex 4-manifold $(M,J)$, we study the subgroups $H^{\pm}_J$ of $H^2(M, \mathbb{R})$ consisting of cohomology classes representable by $J$-invariant, respectively, $J$-anti-invariant 2-forms. If $b^+ =1$, we show that for generic almost complex structures on $M$, the subgroup $H^-_J$ is trivial. Computations of the subgroups and their dimensions $h^{\pm}_J$ are obtained for almost complex structures related to integrable ones. We also prove semi-continuity properties for $h^{\pm}_J$., Comment: 30 pages
- Published
- 2011
- Full Text
- View/download PDF
57. Luttinger surgery and Kodaira dimension
- Author
-
Tian-Jun Li and Chung-I Ho
- Subjects
medicine.medical_specialty ,General Mathematics ,Kodaira dimension ,symbols.namesake ,Mathematics - Geometric Topology ,Mathematics::Algebraic Geometry ,Framing (construction) ,medicine ,FOS: Mathematics ,57R57 ,Mathematics::Symplectic Geometry ,Luttinger surgery ,57R17 ,Mathematics ,framing ,Mathematics::Complex Variables ,Applied Mathematics ,Torus ,Geometric Topology (math.GT) ,Mathematics::Geometric Topology ,53D35 ,Surgery ,Mathematics - Symplectic Geometry ,symbols ,Symplectic Geometry (math.SG) ,Mathematics::Differential Geometry ,Lagrangian ,Symplectic geometry - Abstract
In this note we show that the Lagrangian Luttinger surgery preserves the symplectic Kodaira dimension. Some constraints on Lagrangian tori in symplectic four manifolds with non-positive Kodaira dimension are also derived., Comment: 23 pages; to appear in Asian Journal of Mathematics
- Published
- 2011
- Full Text
- View/download PDF
58. Lagrangian spheres, symplectic surfaces and the symplectic mapping class group
- Author
-
Tian-Jun Li and Weiwei Wu
- Subjects
Computer file ,symplectomorphism group ,53D42 ,Mapping class group ,53D12 ,Algebra ,symbols.namesake ,Lagrangian sphere ,53D05 ,Mathematics - Symplectic Geometry ,FOS: Mathematics ,Isotopy ,symbols ,Symplectic Geometry (math.SG) ,SPHERES ,Geometry and Topology ,Mathematics::Symplectic Geometry ,Lagrangian ,Symplectic geometry ,Mathematics - Abstract
Given a Lagrangian sphere in a symplectic 4-manifold $(M, \omega)$ with $b^+=1$, we find embedded symplectic surfaces intersecting it minimally. When the Kodaira dimension $\kappa$ of $(M, \omega)$ is $-\infty$, this minimal intersection property turns out to be very powerful for both the uniqueness and existence problems of Lagrangian spheres. On the uniqueness side, for a symplectic rational manifold and any class which is not characteristic and ternary, we show that homologous Lagrangian spheres are smoothly isotopic, and when the Euler number is less than 8, we generalize Hind and Evans' Hamiltonian uniqueness in the monotone case. On the existence side, when $\kappa=-\infty$, we give a characterization of classes represented by Lagrangian spheres, which enables us to describe the non-Torelli part of the symplectic mapping class group.
- Published
- 2010
59. The relative symplectic cone and T2-fibrations
- Author
-
Tian-Jun Li and Josef G. Dorfmeister
- Subjects
Pure mathematics ,Symplectic group ,010102 general mathematics ,Mathematical analysis ,Geometric Topology (math.GT) ,16. Peace & justice ,Symplectic representation ,01 natural sciences ,Symplectic matrix ,Mathematics - Geometric Topology ,Symplectic vector space ,Mathematics - Symplectic Geometry ,0103 physical sciences ,FOS: Mathematics ,Symplectic Geometry (math.SG) ,010307 mathematical physics ,Geometry and Topology ,0101 mathematics ,Symplectomorphism ,Mathematics::Symplectic Geometry ,Moment map ,Symplectic manifold ,Mathematics ,Symplectic geometry - Abstract
In this note we introduce the notion of the relative symplectic cone. As an application, we determine the symplectic cone of certain T^2-fibrations. In particular, for some elliptic surfaces we verify a conjecture on the symplectic cone of minimal Kaehler surfaces raised by the second author.
- Published
- 2010
60. [Clinical study of the infra-patellar fat pad strain treated by galvanism penetration of traditional Chinese medicine combined with ultrasonic wave and manipulation]
- Author
-
You-Liang, Tian, Yue, Li, Qian, Li, Tian-Jun, Li, and Hong, Zhu
- Subjects
Male ,Treatment Outcome ,Adipose Tissue ,Ultrasonic Therapy ,Sprains and Strains ,Humans ,Female ,Patella ,Medicine, Chinese Traditional ,Middle Aged ,Musculoskeletal Manipulations ,Pain Measurement - Abstract
To evaluate the therapeutic effects of galvanism penetration of traditional Chinese medicine combined with ultrasonic wave and manipulation in the treatment of strain of the infrapatellar fat pad, to study an effective approach in the treatment of this diseas.Eighty patients were divided randomly into treatment group and control group, there were 40 cases in each group. In treatment group 40 cases were treated by galvanism penetration of traditional Chinese medicine, ultrasonic wave and manipulation, included 22 males and 18 females with an average age of (63.15 +/- 8.10) years old and a mean disease course of (6.84 +/- 3.50) years. In control group, 40 cases were treated with ultrasonic wave and manipulation, included 23 males and 17 females with an average age of (62.63 +/- 8.20) years old and the course was (6.59 +/-3.70) years. visual analogue scale (VAS) and the scales for pain with finger press were evaluated before and after treatment in two groups. The clinical effects were researched and analysed statistically.In treatment group,12 patients were in remarkable effects, 17 in good effective, 9 in effective and 2 in ineffective. As well in control group, above data were 8,15, 8 and 9 respectively. There was a significant difference in the rate of general effective between treatment group and control group (P0.05). In treatment group, the scales for VAS before and after treatment were (7.92 +/- 2.21) and (2.16 +/- 1.87) and the scales for pain with finger press before and after treatment were (3.01 +/- 0.63) and (0.86-- 0.46). As well in control group, above data were (7.71 +/2.65), (3.83 +/- 2.45), (2.98 +/- 0.61) and (1.32 +/- 0.52) respectively. The comparison of the scales for VAS and pain with finger press before and after treatment in two groups had significant difference (PO.01).Ultrasonic wave and manipulation have a good effect in the treatment of stain of the infrapatellar fat pad, when the galvanism penetration of traditional Chinese medicine is applied at the same time, the therapeutic efficiency can be improved significantly. Three therapies are used in treatment at the same, it can improve the therapeutic effect, and it is an easy, economic, practical and effective comprehensive approach.
- Published
- 2010
61. Relative Ruan and Gromov-Taubes Invariants of Symplectic 4-Manifolds
- Author
-
Tian-Jun Li and Josef G. Dorfmeister
- Subjects
Mathematics - Differential Geometry ,Pure mathematics ,Class (set theory) ,Applied Mathematics ,General Mathematics ,Deformation (meteorology) ,Mathematics - Algebraic Geometry ,Hypersurface ,Differential Geometry (math.DG) ,Mathematics - Symplectic Geometry ,FOS: Mathematics ,Symplectic Geometry (math.SG) ,Algebraic Geometry (math.AG) ,Mathematics::Symplectic Geometry ,Symplectic geometry ,Mathematics - Abstract
We define relative Ruan invariants that count embedded connected symplectic submanifolds which contact a fixed symplectic hypersurface V in a symplectic 4-manifold (X, ω) at prescribed points with prescribed contact orders (in addition to insertions on X\V). We obtain invariants of the deformation class of (X, V, ω). Two large issues must be tackled to define such invariants: (1) curves lying in the hypersurface V and (2) genericity results for almost complex structures constrained to make V pseudo-holomorphic (or almost complex). Moreover, these invariants are refined to take into account rim-tori decompositions. In the latter part of the paper, we extend the definition to disconnected submanifolds and construct relative Gromov–Taubes invariants.
- Published
- 2009
62. Symplectic birational geometry
- Author
-
Tian-Jun Li and Yongbin Ruan
- Published
- 2009
63. Symplectic Forms and Cohomology Decomposition of almost Complex Four-Manifolds
- Author
-
Tedi Draghici, Weiyi Zhang, and Tian-Jun Li
- Subjects
Algebra ,Pure mathematics ,Cup product ,General Mathematics ,Group cohomology ,De Rham cohomology ,Gromov–Witten invariant ,Equivariant cohomology ,Čech cohomology ,Cohomology ,Quantum cohomology ,Mathematics - Abstract
For any compact almost complex manifold (M, J), the last two authors [8] defined two subgroups H + J (M), H − J (M) of the degree 2 real de Rham cohomology group . These are the sets of cohomology classes which can be represented by J-invariant, respectively, J-antiinvariant real 2-forms. In this paper, it is shown that in dimension 4 these subgroups induce a cohomology decomposition of . This is a specifically four-dimensional result, as it follows from a recent work of Fino and Tomassini [6]. Some estimates for the dimensions of these groups are also established when the almost complex structure is tamed by a symplectic form and an equivalent formulation for a question of Donaldson is given.
- Published
- 2009
64. Existence of Symplectic Surfaces
- Author
-
Tian-Jun Li
- Subjects
Mathematics - Algebraic Geometry ,Mathematics - Geometric Topology ,Mathematics - Symplectic Geometry ,010102 general mathematics ,0103 physical sciences ,FOS: Mathematics ,Symplectic Geometry (math.SG) ,Geometric Topology (math.GT) ,010307 mathematical physics ,0101 mathematics ,01 natural sciences ,Algebraic Geometry (math.AG) ,Mathematics::Symplectic Geometry - Abstract
In this paper we show that every degree 2 homology class of a 2n-dimensional symplectic manifold is represented by an immersed symplectic surface if it has positive symplectic area. Moreover, the symplectic surface can be chosen to be embedded if 2n is at least 6. We also analyze the additional conditions under which embedded symplectic representatives exist in dimension 4.
- Published
- 2008
65. [Characteristics and therapeutic experiences of leg open fractures in earthquake casualties]
- Author
-
Shuo-gui, Xu, Ya-le, Wu, Jia-lin, Wang, Dao-feng, Ben, Qiang, Fu, Fu-li, Zhang, Heng-jun, Fan, Tian-jun, Li, Song, Shi, and Qiang, Li
- Subjects
Adult ,Aged, 80 and over ,Male ,China ,Adolescent ,Middle Aged ,Disasters ,Fractures, Open ,Earthquakes ,Humans ,Female ,Child ,Aged ,Leg Injuries - Published
- 2008
66. [Effect of platelet CD42a modification by mPEG-SPA with different molecular masses]
- Author
-
Yin-ze, Zhang, Wen, Xiong, Zhen, Li, Chao-peng, Shao, Tian-jun, Li, Feng, Zhao, and Bao-cheng, Yang
- Subjects
Blood Platelets ,Molecular Weight ,Platelet Glycoprotein GPIb-IX Complex ,Humans ,Succinimides ,Polyethylene Glycols - Abstract
To observe the effect platelet antigen modification by mPEG-SPA with different molecular masses.Platelet CD42a was modified by 5 kD and 20 kD mPEG-SPA, respectively, and the fluorescence intensity of CD42a was detect by flow cytometry and the three-dimensional structure of CD42a simulated to analyze the distribution of lysine in CD42a molecule.After platelet CD42a modification by 5 kD and 20 kD mPEG-SPA, the fluorescence intensity of CD42a decreased sharply by 85.54% and 88.65%, respectively, and multiple lysine regions were identified on the surface of CD42a molecule.Both 5 kD and 20 kD mPEG-SPA allow useful modification of platelet CD42a, but 20 kD mPEG-SPA is more advantageous than 5 kD mPEG-SPA.
- Published
- 2007
67. Comparing tamed and compatible symplectic cones and cohomological properties of almost complex manifolds
- Author
-
Tian-Jun Li and Weiyi Zhang
- Subjects
Mathematics - Differential Geometry ,Statistics and Probability ,Large class ,Pure mathematics ,Structure (category theory) ,Duality (optimization) ,Homology (mathematics) ,Mathematics::Geometric Topology ,Cohomology ,Mathematics - Algebraic Geometry ,Differential Geometry (math.DG) ,Mathematics - Symplectic Geometry ,FOS: Mathematics ,Symplectic Geometry (math.SG) ,Geometry and Topology ,Mathematics::Differential Geometry ,Statistics, Probability and Uncertainty ,Mathematics::Symplectic Geometry ,Algebraic Geometry (math.AG) ,Analysis ,Symplectic geometry ,Mathematics - Abstract
We introduce certain homology and cohomology subgroups for any almost complex structure and study their pureness, fullness and duality properties. Motivated by a question of Donaldson, we use these groups to relate J-tamed symplectic cones and J-compatible symplectic cones over a large class of almost complex manifolds, including all Kahler manifolds, almost Kahler 4-manifolds and complex surfaces., Comment: v3 substantially revised and title changed, v4 One main result (Theorem 1.3) substantially improved
- Published
- 2007
- Full Text
- View/download PDF
68. Birational cobordism invariance of uniruled symplectic manifolds
- Author
-
Yongbin Ruan, Jianxun Hu, and Tian-Jun Li
- Subjects
Mathematics - Differential Geometry ,Pure mathematics ,General Mathematics ,Cobordism ,Invariant (physics) ,Submanifold ,Mathematics::Geometric Topology ,Mathematics - Algebraic Geometry ,Mathematics::Algebraic Geometry ,Differential Geometry (math.DG) ,Mathematics - Symplectic Geometry ,FOS: Mathematics ,Symplectic Geometry (math.SG) ,Direct consequence ,Birational invariant ,Algebraic Geometry (math.AG) ,Mathematics::Symplectic Geometry ,Symplectic manifold ,Symplectic geometry ,Mathematics - Abstract
A symplectic manifold $(M,\omega)$ is called {\em (symplectically) uniruled} if there is a nonzero genus zero GW invariant involving a point constraint. We prove that symplectic uniruledness is invariant under symplectic blow-up and blow-down. This theorem follows from a general Relative/Absolute correspondence for a symplectic manifold together with a symplectic submanifold. A direct consequence is that symplectic uniruledness is a symplectic birational invariant. Here we use Guillemin and Sternberg's notion of cobordism as the symplectic analogue of the birational equivalence., Comment: To appear in Invent. Math
- Published
- 2006
69. Symplectic 4-manifolds with Kodaira dimension zero
- Author
-
Tian-Jun Li
- Subjects
Pure mathematics ,Algebra and Number Theory ,Mathematics::Complex Variables ,Mathematical analysis ,Symplectic representation ,Symplectic matrix ,53D35 ,Symplectic vector space ,Mathematics::Algebraic Geometry ,32J27 ,Kodaira dimension ,Geometry and Topology ,Mathematics::Differential Geometry ,Symplectomorphism ,Moment map ,Mathematics::Symplectic Geometry ,Analysis ,57R17 ,Mathematics ,Symplectic geometry ,Symplectic manifold - Abstract
We discuss the notion of the Kodaira dimension for symplectic manifolds in dimension 4. In particular, we propose and partially verify Betti number bounds for symplectic 4-manifolds with Kodaira dimension zero.
- Published
- 2006
70. Symplectic forms and surfaces of negative square
- Author
-
Tian-Jun Li and Michael Usher
- Subjects
Pure mathematics ,Symplectic group ,010308 nuclear & particles physics ,010102 general mathematics ,Mathematical analysis ,Symplectic representation ,01 natural sciences ,Symplectic matrix ,Symplectic vector space ,53D05 ,Mathematics - Symplectic Geometry ,0103 physical sciences ,FOS: Mathematics ,Symplectic Geometry (math.SG) ,Geometry and Topology ,0101 mathematics ,Symplectomorphism ,Moment map ,Mathematics::Symplectic Geometry ,Symplectic geometry ,Mathematics ,Symplectic manifold - Abstract
We introduce an analogue of the inflation technique of Lalonde-McDuff, allowing us to obtain new symplectic forms from symplectic surfaces of negative self-intersection in symplectic four-manifolds. We consider the implications of this construction for the symplectic cones of K\"ahler surfaces, proving along the way a result which can be used to simplify the intersections of distinct pseudoholomorphic curves via a perturbation., Comment: 17 pages. To appear in Journal of Symplectic Geometry
- Published
- 2006
71. On the diffeomorphism groups of rational and ruled 4-manifolds
- Author
-
Bang He Li and Tian-Jun Li
- Subjects
Algebra ,Pure mathematics ,Automorphism group ,57R50 ,Uniqueness ,Diffeomorphism ,Homology (mathematics) ,Mathematics::Geometric Topology ,Mathematics::Symplectic Geometry ,Mathematics - Abstract
Let $A(M)$ be the automorphism group of the middle homology of a smooth 4-manifold $M$ and $D(M)$ be the subgroup induced by diffeomorphisms of $M$. In this paper we give explicit generators of $D(M)$ for rational and ruled 4-manifolds. We also prove the uniqueness of reduced forms for classes with minimal genus 0 and non-negative square.
- Published
- 2006
72. Quaternionic Bundles and Betti Numbers of Symplectic 4-Manifolds with Kodaira Dimension Zero
- Author
-
Tian-Jun Li
- Subjects
Pure mathematics ,General Mathematics ,FOS: Physical sciences ,01 natural sciences ,Symplectic vector space ,Mathematics - Geometric Topology ,Mathematics::Algebraic Geometry ,0103 physical sciences ,FOS: Mathematics ,57R57 ,0101 mathematics ,Symplectomorphism ,Moment map ,Mathematics::Symplectic Geometry ,Mathematical Physics ,Symplectic manifold ,Mathematics ,Symplectic group ,Mathematics::Complex Variables ,010102 general mathematics ,Mathematical analysis ,Geometric Topology (math.GT) ,Mathematical Physics (math-ph) ,Symplectic representation ,Mathematics - Symplectic Geometry ,Kodaira dimension ,Symplectic Geometry (math.SG) ,010307 mathematical physics ,Mathematics::Differential Geometry ,Symplectic geometry - Abstract
The Kodaira dimension of a non-minimal manifold is defined to be that of any of its minimal models. It is shown in [12] that, if ω is a Kahler form on a complex surface (M,J), then κ(M,ω) agrees with the usual holomorphic Kodaira dimension of (M,J). It is also shown in [12] that minimal symplectic 4−manifolds with κ = 0 are exactly those with torsion canonical class, thus can be viewed as symplectic Calabi-Yau surfaces. Known examples of symplectic 4−manifolds with torsion canonical class are either Kahler surfaces with (holomorphic) Kodaira dimension zero or T 2−bundles over T 2 ([10], [12]). They all have small Betti numbers and Euler numbers: b+ ≤ 3, b ≤ 19 and b1 ≤ 4; and the Euler number is between 0 and 24. It is speculated in [12] that these are the only ones. In this paper we prove that it is true up to rational homology.
- Published
- 2006
- Full Text
- View/download PDF
73. Geography of symplectic 4-manifolds with Kodaira dimension one
- Author
-
Tian-Jun Li and Scott Baldridge
- Subjects
Pure mathematics ,symplectic 4–manifolds ,01 natural sciences ,57M60 ,Mathematics - Geometric Topology ,0103 physical sciences ,Simply connected space ,FOS: Mathematics ,57R57 ,0101 mathematics ,Mathematics::Symplectic Geometry ,57R17 ,Symplectic manifold ,Mathematics ,010102 general mathematics ,Geometric Topology (math.GT) ,Cohomology ,symplectic topology ,53D05 ,Mathematics - Symplectic Geometry ,57R17, 53D05, 57R57, 57M60 ,Kodaira dimension ,Symplectic Geometry (math.SG) ,010307 mathematical physics ,Geometry and Topology ,Degeneracy (mathematics) ,Symplectic geometry - Abstract
The geography problem is usually stated for simply connected symplectic 4-manifolds. When the first cohomology is nontrivial, however, one can restate the problem taking into account how close the symplectic manifold is to satisfying the conclusion of the Hard Lefschetz Theorem, which is measured by a nonnegative integer called the degeneracy. In this paper we include the degeneracy as an extra parameter in the geography problem and show how to fill out the geography of symplectic 4-manifolds with Kodaira dimension 1 for all admissible triples., Published by Algebraic and Geometric Topology at http://www.maths.warwick.ac.uk/agt/AGTVol5/agt-5-15.abs.html
- Published
- 2005
74. Uniqueness of Symplectic Canonical Class, Surface Cone and Symplectic Cone of 4-Manifolds with B+ = 1
- Author
-
Ai Ko Liu and Tian-Jun Li
- Subjects
Pure mathematics ,Algebra and Number Theory ,Symplectic group ,Mathematical analysis ,Symplectic representation ,Symplectic matrix ,Symplectic vector space ,Geometry and Topology ,Symplectomorphism ,Mathematics::Symplectic Geometry ,Moment map ,Analysis ,Symplectic manifold ,Symplectic geometry ,Mathematics - Abstract
Let M be a closed oriented smooth 4-manifold admitting symplectic structures. If M is minimal and has b+ = 1, we prove that there is a unique symplectic canonical class up to sign, and any real second cohomology class of positive square is represented by symplectic forms. Similar results hold when M is not minimal.
- Published
- 2001
75. Symplectic genus, minimal genus and diffeomorphisms
- Author
-
Bang-He Li and Tian-Jun Li
- Subjects
Pure mathematics ,Group (mathematics) ,Applied Mathematics ,General Mathematics ,Structure (category theory) ,Geometric Topology (math.GT) ,Mathematics::Geometric Topology ,Square (algebra) ,Manifold ,Mathematics - Geometric Topology ,Intersection ,Mathematics - Symplectic Geometry ,Genus (mathematics) ,FOS: Mathematics ,Symplectic Geometry (math.SG) ,Diffeomorphism ,Mathematics::Symplectic Geometry ,Symplectic geometry ,Mathematics - Abstract
In this paper, the symplectic genus for any 2-dimensional class in a 4-manifold admitting a symplectic structure is introduced, and its relation with the minimal genus is studied. It is used to describe which classes in rational and irrational ruled manifolds are realized by connected symplectic surfaces. In particular, we completely determine which classes with square at least -1 in such manifolds can be represented by embedded spheres. Moreover, based on a new characterization of the action of the diffeomorphism group on the intersection forms of a rational manifold, we are able to determine the orbits of the diffeomorphism group on the set of classes represented by embedded spheres of square at least -1 in any 4-manifold admitting a symplectic structure., Comment: 28 pages
- Published
- 2001
- Full Text
- View/download PDF
76. Soft Terms in M-theory
- Author
-
Tian-jun Li
- Subjects
Physics ,High Energy Physics - Theory ,Nuclear and High Energy Physics ,Particle physics ,Computer Science::Information Retrieval ,Supergravity ,Superpotential ,High Energy Physics::Phenomenology ,FOS: Physical sciences ,Supersymmetry ,Moduli ,High Energy Physics - Phenomenology ,General Relativity and Quantum Cosmology ,High Energy Physics::Theory ,High Energy Physics - Phenomenology (hep-ph) ,High Energy Physics - Theory (hep-th) ,Dilaton ,High Energy Physics::Experiment ,Symmetry breaking ,Gauge theory ,Mathematics::Symplectic Geometry ,Gaugino condensation ,Mathematical physics - Abstract
We discuss dilaton and Moduli dominant SUSY breaking scenarios in M-theory. In addition, for the nonperturbative superpotential from gaugino condensation, we discuss the soft terms in the simplest model (only S and T moduli fields) and in the $T^6/Z_{12}$ model from M-theory. From the phenomenology consideration, we suggest massless scalar SUSY breaking scenario., Comment: 15 pages, latex, 4 figures
- Published
- 1998
- Full Text
- View/download PDF
77. Study on the Internal Development Law of Supply-Demand Balance of Urban Road Traffic
- Author
-
Lv, Zhen, primary, Tian, Jun Li, additional, and Zou, Xiang Li, additional
- Published
- 2013
- Full Text
- View/download PDF
78. Research on the Integrated Planning of Urban Passenger Transit Network
- Author
-
Wang, Zheng Yu, primary, Tian, Jun Li, additional, Jia, Yu Wen, additional, and Li, Cheng Bin, additional
- Published
- 2013
- Full Text
- View/download PDF
79. Research on the Planning Methods of Integrated Urban Passenger Transit Network
- Author
-
Li, Cheng Bing, primary, Tian, Jun Li, additional, Jia, Hua Fei, additional, and Jia, Yu Wen, additional
- Published
- 2013
- Full Text
- View/download PDF
80. Research on China's Economic Growth and the Consumption of Energy in the Low-Carbon Economy
- Author
-
Li, Jin Ying, primary, Zhang, Chun Lian, additional, and Tian, Jun Li, additional
- Published
- 2011
- Full Text
- View/download PDF
81. J-Holomorphic Curves in a Nef Class.
- Author
-
Tian-Jun Li and Weiyi Zhang
- Subjects
- *
PARAMETRIC equations , *CURVES in design , *CURVILINEAR motion , *COMBINATORICS , *HOLOMORPHIC functions , *MATHEMATICAL complex analysis - Abstract
Taubes established fundamental properties of J-holomorphic subvarieties in dimension 4 in [8]. In this paper, we further investigate properties of reducible J-holomorphic subvarieties. We offer an upper bound of the total genus of a subvariety when the class of the subvariety is J-nef. For a spherical class, it has particularly strong consequences. It is shown that, for any tamed J, each irreducible component is a smooth rational curve. It might be even new when J is integrable. We also completely classify configurations of maximal dimension. To prove these results, we treat subvarieties as weighted graphs and introduce several combinatorial moves. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF
82. ALMOST KÄ HLER FORMS ON RATIONAL 4-MANIFOLDS.
- Author
-
TIAN-JUN LI and WEIYI ZHANG
- Subjects
- *
ENDOMORPHISMS , *CALABI-Yau manifolds , *ORTHONORMAL basis , *TRIGONOMETRIC functions , *PERMUTATION groups - Abstract
We study Nakai-Moishezon type question and Donaldson's "tamed to compatible" question for almost complex structures on rational four manifolds. By extending Taubes' subvarieties-current-form technique to J-nef genus 0 classes, we give affirmative answers of these two questions for all tamed almost complex structures on S2 bundles over S2 as well as for many geometrically interesting tamed almost complex structures on other rational four manifolds, including the del Pezzo ones. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF
83. [Untitled]
- Author
-
Tian-Jun Li
- Subjects
Algebra ,Mathematics::Algebraic Geometry ,Complex geometry ,Mathematics::K-Theory and Homology ,Mathematics::Complex Variables ,General Mathematics ,Holomorphic function ,Fibration ,Algebraic geometry ,Mathematics::Algebraic Topology ,Mathematics::Symplectic Geometry ,Symplectic geometry ,Mathematics - Abstract
Lefschetz fibration is the symplectic analogue of stable holomorphic fibration in complex geometry. A 4-dimensional stable holomorphic fibration satisfies the famous Parshin-Arakelov inequality. In this note we present an analogous inequality for a 4-dimensional Lefschetz fibration.
- Published
- 2000
84. [Untitled]
- Author
-
Tian-Jun Li and Ai Ko Liu
- Subjects
Discrete mathematics ,Series (mathematics) ,General Mathematics ,Mathematics::Differential Geometry ,Mathematics::Geometric Topology ,Mathematics::Symplectic Geometry ,Equivalence (measure theory) ,Mathematics - Abstract
).In the series of works [T1]–[T4];Taubes develops the Seiberg-Witten theory onsymplectic manifolds. In [T1];he defines the Gromov-Taubes invariants of symplectic4-manifolds counting embedded (but not necessarily connected);pseudoholomorphiccurves. (It was recently proved in [EP] that the Gromov invariants can also be constructedfrom the Ruan-Tian invariants [RT2]). In [T2];[T3];and [T4];Taubes proves;on a sym-plectic 4-manifold with b
- Published
- 1999
85. Topological charged black holes in generalized Hořava-Lifshitz gravity.
- Author
-
Tian-Jun Li, Yong-Hui Qi, Yue-Liang Wu, and Yun-Long Zhang
- Subjects
- *
BLACK holes , *QUANTUM gravity , *RICCI flow , *LAGRANGIAN functions , *THERMODYNAMICS - Abstract
As a candidate of quantum gravity in ultrahigh energy, the (3+1)-dimensional Hořava-Lifshitz (HL) gravity with critical exponent z≠1 indicates anisotropy between time and space at short distance. In the paper, we investigate the most general z=d Hořava-Lifshitz gravity in arbitrary spatial dimension d, with a generic dynamical Ricci flow parameter λ and a detailed balance violation parameter ε. In arbitrary dimensional generalized HLd+1 gravity with z≥d at long distance, we study the topological neutral black hole solutions with general λ in z=d HLd+1, as well as the topological charged black holes with λ=1 in z=d HLd+1. The HL gravity in the Lagrangian formulation is adopted, while in the Hamiltonian formulation, it reduces to Dirac-De Witt's canonical gravity with λ=1. In particular, the topological charged black holes in z=5 HL6, z=4 HL5, z=3,4 HL4, and z=2 HL3 with λ=1 are solved. Their asymptotical behaviors near the infinite boundary and near the horizon are explored, respectively. We also study the behavior of the topological black holes in the (d+1)-dimensional HL gravity with U(1) gauge field in the zero temperature limit and finite temperature limit, respectively. Thermodynamics of the topological charged black holes with λ=1, including temperature, entropy, heat capacity, and free energy are evaluated. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
86. Birational cobordism invariance of uniruled symplectic manifolds.
- Author
-
Jianxun Hu, Tian-Jun Li, and Ruan, Yongbin
- Subjects
- *
SYMPLECTIC manifolds , *GEOMETRY , *COBORDISM theory , *TABLE of contents (Documentation) , *MANIFOLDS (Mathematics) - Abstract
The article offers information on birational cobordism invariance related to uniruled symplectic manifolds. It cites table of contents of the related topic. It mentions Mori's birational geometry program. It defines birational cobordism for symplectic manifiolds. It discusses several theorems related to birational cobordism. An overview of coupling form and linear deformations is offered. Birational invariance alongwith explanation of related theorems is also discussed.
- Published
- 2008
- Full Text
- View/download PDF
87. Counting curves on elliptic ruled surface
- Author
-
Tian-Jun Li and Ai Ko Liu
- Subjects
Pure mathematics ,Ruled surface ,Computation ,Geometry ,Geometry and Topology ,Homology (mathematics) ,Mathematics::Symplectic Geometry ,Symplectic geometry ,Mathematics - Abstract
In this paper, we present some calculation of the Gromov–Witten invariants of S2 × T 2. Since the symplectic Gromov–Witten invariants in fact only depend on the deformation class of symplectic forms and we have shown in [10] that there is a unique deformation class on S2 ×T 2, we merely need to compute the Gromov–Witten invariants for some specific symplectic structure. We will actually pick some Kahler structures in the computation. Let (M,ω) be a symplectic S2 × T 2 and [S2] and [T 2] be the homology classes represented by S2 × pt and pt × T 2, respectively, and pair positively with the symplectic form ω. Denote the homology class l[S2]+d[T 2] by Al,d and we simply write A1,d as Ad . Our first result is about the embedded genus one curves of the sequence of classes Al,1. More precisely, let us define N1(Al,1) as the number of embedded genus 1 curves in the class A1,d and passing through 2l points.
- Full Text
- View/download PDF
88. Minimal genus smooth embeddings in S2 × S2 and CP2 # nCP2 with n ⩽ 8
- Author
-
Bang He Li and Tian-Jun Li
- Subjects
Combinatorics ,Genus (mathematics) ,Geometry and Topology ,Mathematics - Full Text
- View/download PDF
89. Photodynamic antimicrobial chemotherapy with the novel amino acid-porphyrin conjugate 4I: In vitro and in vivo studies.
- Author
-
Yao Yuan, Zi-Quan Liu, Heng Jin, Shi Sun, Tian-Jun Liu, Xue Wang, Hao-Jun Fan, Shi-Ke Hou, and Hui Ding
- Subjects
Medicine ,Science - Abstract
Photodynamic antimicrobial chemotherapy (PACT), as a novel and effective therapeutic modality to eradicate drug resistant bacteria without provoking multidrug resistance, has attracted increasing attention. This study examined the antimicrobial efficacy of the novel cationic amino acid-porphyrin conjugate 4I with four lysine groups against two different clinical isolated strains (drug sensitive and multidrug resistant) of the Acinetobacter baumannii species and its toxicity on murine dermal fibroblasts in vitro, as well as the therapeutic effect of PACT on acute, potentially lethal multidrug resistant strain excisional wound infections in vivo. The PACT protocol exposed 4I to illumination, exhibiting high antimicrobial efficacy on two different strains due to a high yield of reactive oxygen species (ROS) and non-selectivity to microorganisms. The photoinactivation effects of 4I against two different strains were dose-dependent. At 3.9 μM and 7.8 μM, PACT induced 6 log units of inactivation of sensitive and multidrug resistant strains. In contrast, 4I alone and illumination alone treatments had no visibly antimicrobial effect. Moreover, cytotoxicity tests revealed the great safety of the photosensitizer 4I in mice. In the in vivo study, we found 4I-mediated PACT was not only able to kill bacteria but also accelerated wound recovery. Compared with non-treated mice, over 2.89 log reduction of multidrug resistant Acinetobacter baumannii strain was reached in PACT treat mice at 24 h post-treatment. These results imply that 4I-mediated PACT therapy is an effective and safe alternative to conventional antibiotic therapy and has clinical potential for superficial drug-resistant bacterial infections.
- Published
- 2017
- Full Text
- View/download PDF
90. Incompressible Navier-Stokes equations from Einstein gravity with Chern-Simons term.
- Author
-
Rong-Gen Cai, Tian-Jun Li, Yong-Hui Qi, and Yun-Long Zhang
- Subjects
- *
NAVIER-Stokes equations , *CHERN-Simons gauge theory , *NONRELATIVISTIC quantum mechanics - Abstract
In (2+1)-dimensional hydrodynamic systems with broken parity, the shear and bulk viscosity is joined by the Hall viscosity and curl viscosity. The dual holographic model has been constructed by coupling a pseudoscalar to the gravitational Chern-Simons term in (3+1)-dimensional bulk gravity. In this paper, we investigate the nonrelativistic fluid with Hall viscosity and curl viscosity living on a finite radial cutoff surface in the bulk. Employing the nonrelativistic hydrodynamic expansion method, we obtain the incompressible Navier-Stokes equations with Hall viscosity and curl viscosity. Unlike the shear viscosity, the ratio of the Hall viscosity over entropy density is found to be cutoff scale dependent, and it tends to zero when the cutoff surface approaches the horizon of the background space-time. [ABSTRACT FROM AUTHOR]
- Published
- 2012
- Full Text
- View/download PDF
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.