11 results on '"Arkady Berenstein"'
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2. Noncommutative Catalan numbers
- Author
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Vladimir Retakh and Arkady Berenstein
- Subjects
Pure mathematics ,0102 computer and information sciences ,01 natural sciences ,Representation theory ,Combinatorics ,Catalan number ,Quadratic equation ,Mathematics::K-Theory and Homology ,Mathematics::Quantum Algebra ,Mathematics - Quantum Algebra ,FOS: Mathematics ,Quantum Algebra (math.QA) ,Discrete Mathematics and Combinatorics ,Mathematics - Combinatorics ,Representation Theory (math.RT) ,0101 mathematics ,Commutative property ,Binomial coefficient ,Mathematics ,Mathematics::Combinatorics ,Mathematics::Operator Algebras ,Laurent polynomial ,010102 general mathematics ,Quantum algebra ,Noncommutative geometry ,010201 computation theory & mathematics ,Combinatorics (math.CO) ,Mathematics - Representation Theory - Abstract
The goal of this paper is to introduce and study noncommutative Catalan numbers $C_n$ which belong to the free Laurent polynomial algebra in $n$ generators. Our noncommutative numbers admit interesting (commutative and noncommutative) specializations, one of them related to Garsia-Haiman $(q,t)$-versions, another -- to solving noncommutative quadratic equations. We also establish total positivity of the corresponding (noncommutative) Hankel matrices $H_m$ and introduce accompanying noncommutative binomial coefficients., 12 pages AM LaTex, a picture and proof of Lemma 3.6 are added, misprints corrected
- Published
- 2017
3. Canonical bases of quantum Schubert cells and their symmetries
- Author
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Jacob Greenstein and Arkady Berenstein
- Subjects
Pure mathematics ,General Mathematics ,010102 general mathematics ,General Physics and Astronomy ,Basis (universal algebra) ,Characterization (mathematics) ,Bilinear form ,01 natural sciences ,Mathematics::Quantum Algebra ,0103 physical sciences ,Homogeneous space ,Standard basis ,Mathematics - Quantum Algebra ,FOS: Mathematics ,Quantum Algebra (math.QA) ,010307 mathematical physics ,0101 mathematics ,Representation Theory (math.RT) ,Mathematics::Representation Theory ,Quantum ,Mathematics - Representation Theory ,Mathematics - Abstract
The goal of this work is to provide an elementary construction of the canonical basis $\mathbf B(w)$ in each quantum Schubert cell~$U_q(w)$ and to establish its invariance under modified Lusztig's symmetries. To that effect, we obtain a direct characterization of the upper global basis $\mathbf B^{up}$ in terms of a suitable bilinear form and show that $\mathbf B(w)$ is contained in $\mathbf B^{up}$ and its large part is preserved by modified Lusztig's symmetries., AMSLaTeX, 32 pages,typos corrected
- Published
- 2016
4. Mystic Reflection Groups
- Author
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Yuri Bazlov and Arkady Berenstein
- Subjects
Pure mathematics ,Class (set theory) ,Group (mathematics) ,Zhàng ,Combinatorics ,Reflection (mathematics) ,Mathematics - Quantum Algebra ,FOS: Mathematics ,Quantum Algebra (math.QA) ,Geometry and Topology ,Isomorphism ,Representation Theory (math.RT) ,Mathematical Physics ,Analysis ,Mathematics - Representation Theory ,Mathematics - Abstract
This paper aims to systematically study mystic reflection groups that emerged independently in the paper [Selecta Math. (N.S.) 14 (2009), 325-372, arXiv:0806.0867] by the authors and in the paper [Algebr. Represent. Theory 13 (2010), 127-158, arXiv:0806.3210] by Kirkman, Kuzmanovich and Zhang. A detailed analysis of this class of groups reveals that they are in a nontrivial correspondence with the complex reflection groups $G(m,p,n)$. We also prove that the group algebras of corresponding groups are isomorphic and classify all such groups up to isomorphism.
- Published
- 2013
5. Cocycle Twists and Extensions of Braided Doubles
- Author
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Arkady Berenstein and Yuri Bazlov
- Subjects
010101 applied mathematics ,16G99 ,Mathematics::Quantum Algebra ,010102 general mathematics ,Mathematics - Quantum Algebra ,FOS: Mathematics ,Quantum Algebra (math.QA) ,Representation Theory (math.RT) ,0101 mathematics ,16. Peace & justice ,01 natural sciences ,Mathematics - Representation Theory - Abstract
It is well known that central extensions of a group G correspond to 2-cocycles on G. Cocycles can be used to construct extensions of G-graded algebras via a version of the Drinfeld twist introduced by Majid. We show how 2-cocycles can be defined for an abstract monoidal category C, following Panaite, Staic and Van Oystaeyen. A braiding on C leads to analogues of Nichols algebras in C, and we explain how the recent work on twists of Nichols algebras by Andruskiewitsch, Fantino, Garcia and Vendramin fits in this context. Furthermore, we propose an approach to twisting the multiplication in braided doubles, which are a class of algebras with triangular decomposition over G. Braided doubles are not G-graded, but may be embedded in a double of a Nichols algebra, where a twist may be carried out if careful choices are made. This is a source of new algebras with triangular decomposition. As an example, we show how to twist the rational Cherednik algebra of the symmetric group by the cocycle arising from the Schur covering group, obtaining the spin Cherednik algebra introduced by Wang., 60 pages, LaTeX; v2: references added, misprints corrected
- Published
- 2012
6. Affine buildings for dihedral groups
- Author
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Michael Kapovich and Arkady Berenstein
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20G15 ,Hyperbolic geometry ,Group Theory (math.GR) ,Algebraic geometry ,53C20 ,Dihedral group ,math.RT ,Mathematics::Group Theory ,Mathematics - Metric Geometry ,FOS: Mathematics ,Physical Sciences and Mathematics ,20E42 ,math.GR ,Representation Theory (math.RT) ,Topology (chemistry) ,Projective geometry ,Mathematics ,51E24 ,math.MG ,Metric Geometry (math.MG) ,Algebra ,Differential geometry ,Geometry and Topology ,Affine transformation ,Mathematics - Group Theory ,Mathematics - Representation Theory - Abstract
We construct rank 2 thick nondiscrete affine buildings associated with an arbitrary finite dihedral group., Comment: 40 pages, 10 figures
- Published
- 2008
7. Quantum cluster algebras
- Author
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Arkady Berenstein and Andrei Zelevinsky
- Subjects
Cluster algebra ,Mathematics(all) ,General Mathematics ,01 natural sciences ,Representation theory ,Quadratic algebra ,Mathematics - Algebraic Geometry ,0103 physical sciences ,Mathematics - Quantum Algebra ,FOS: Mathematics ,Cartan matrix ,Quantum Algebra (math.QA) ,Quantum torus ,Representation Theory (math.RT) ,0101 mathematics ,20G42 ,Mathematics::Representation Theory ,Algebraic Geometry (math.AG) ,CCR and CAR algebras ,Mathematics ,Ring theory ,Quantum group ,14M17, 22E46 ,010102 general mathematics ,Double Bruhat cell ,Algebra ,Operator algebra ,Algebra representation ,010307 mathematical physics ,Mathematics - Representation Theory - Abstract
Cluster algebras were introduced by S. Fomin and A. Zelevinsky in math.RT/0104151; their study continued in math.RA/0208229, math.RT/0305434. This is a family of commutative rings designed to serve as an algebraic framework for the theory of total positivity and canonical bases in semisimple groups and their quantum analogs. In this paper we introduce and study quantum deformations of cluster algebras., Minor corrections; final version, to appear in Advances in Mathematics; 41 pages
- Published
- 2004
8. Quasiharmonic polynomials for Coxeter groups and representations of Cherednik algebras.
- Author
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Arkady Berenstein and Yurii Burman
- Subjects
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POLYNOMIALS , *HARMONIC functions , *COXETER groups , *REPRESENTATIONS of algebras , *DEFORMATIONS (Mechanics) , *HOMOTOPY theory , *MODULES (Algebra) , *DIMENSIONAL analysis - Abstract
We introduce and study deformations of finite-dimensional modules over rational Cherednik algebras. Our main tool is a generalization of usual harmonic polynomials for each Coxeter group --- the so-called quasiharmonic polynomials. A surprising application of this approach is the construction of canonical elementary symmetric polynomials and their deformations for all Coxeter groups. [ABSTRACT FROM AUTHOR]
- Published
- 2009
- Full Text
- View/download PDF
9. Noncommutative Dunkl operators and braided Cherednik algebras.
- Author
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Yuri Bazlov and Arkady Berenstein
- Subjects
- *
NONCOMMUTATIVE algebras , *MATHEMATICAL transformations , *FRACTIONAL calculus , *MATHEMATICAL analysis - Abstract
Abstract. We introduce braided Dunkl operators $$\underline{\nabla}_1,\ldots,\underline{\nabla}_n$$ that act on a q-symmetric algebra $$S_{\bf q}({\mathbb{C}}^n)$$ and q-commute. Generalising the approach of Etingof and Ginzburg, we explain the q-commutation phenomenon by constructing braided Cherednik algebras $$\underline{{\mathcal{H}}}$$ for which the above operators form a representation. We classify all braided Cherednik algebras using the theory of braided doubles developed in our previous paper. Besides ordinary rational Cherednik algebras, our classification gives new algebras $$\underline{{\mathcal{H}}}(W_+)$$ attached to an infinite family of subgroups of even elements in complex reflection groups, so that the corresponding braided Dunkl operators $$\underline{\nabla}_i$$ pairwise anticommute. We explicitly compute these new operators in terms of braided partial derivatives and W+-divided differences. [ABSTRACT FROM AUTHOR]
- Published
- 2009
- Full Text
- View/download PDF
10. Braided symmetric and exterior algebras.
- Author
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Arkady Berenstein and Sebastian Zwicknagl
- Published
- 2007
11. Double Poisson brackets on free associative algebras
- Author
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Odesskii, Alexander, Roubtsov, Vladimir, Sokolov, Vladimir, Laboratoire Angevin de Recherche en Mathématiques (LAREMA), Université d'Angers (UA)-Centre National de la Recherche Scientifique (CNRS), Arkady Berenstein, Vladimir Retakh, Chercheur indépendant, GEANPYL, and Roubtsov, Vladimir
- Subjects
[PHYS.MPHY]Physics [physics]/Mathematical Physics [math-ph] ,17B80, 17B63, 32L81, 14H70 ,FOS: Physical sciences ,01 natural sciences ,[MATH.MATH-MP]Mathematics [math]/Mathematical Physics [math-ph] ,Mathematics::Quantum Algebra ,0103 physical sciences ,Mathematics - Quantum Algebra ,associative Yang-Baxter equations ,FOS: Mathematics ,Quantum Algebra (math.QA) ,0101 mathematics ,[MATH.MATH-MP] Mathematics [math]/Mathematical Physics [math-ph] ,[MATH.MATH-RT] Mathematics [math]/Representation Theory [math.RT] ,[MATH]Mathematics [math] ,Mathematics::Symplectic Geometry ,[MATH.MATH-QA] Mathematics [math]/Quantum Algebra [math.QA] ,Nonlinear Sciences - Exactly Solvable and Integrable Systems ,double Poisson structures ,[MATH.MATH-RT]Mathematics [math]/Representation Theory [math.RT] ,010308 nuclear & particles physics ,010102 general mathematics ,[PHYS.MPHY] Physics [physics]/Mathematical Physics [math-ph] ,16. Peace & justice ,[MATH.MATH-QA]Mathematics [math]/Quantum Algebra [math.QA] ,Exactly Solvable and Integrable Systems (nlin.SI) - Abstract
We discuss double Poisson structures in sense of M. Van den Bergh on free associative algebras focusing on the case of quadratic Poisson brackets. We establish their relations with an associative version of Young-Baxter equations, we study a bi-hamiltonian property of the linear-quadratic pencil of the double Poisson structure and propose a classification of the quadratic double Poisson brackets in the case of the algebra with two free generators. Many new examples of quadratic double Poisson brackets are proposed., Comment: 19 pages, latex
- Published
- 2013
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