Isomorphism problems of noncommutative deformations of type $D$ Kleinian singularities
HTML articles powered by AMS MathViewer
- by Paul Levy PDF
- Trans. Amer. Math. Soc. 361 (2009), 2351-2375 Request permission
Abstract:
We construct all possible noncommutative deformations of a Kleinian singularity ${\mathbb C}^2/\Gamma$ of type $D_n$ in terms of generators and relations, and solve the isomorphism problem for the associative algebras thus constructed. We prove that (in our parametrization) all isomorphisms arise from the action of the normalizer $N_{\operatorname {SL}(2)}(\Gamma )$ on ${\mathbb C}/\Gamma$. We deduce that the moduli space of isomorphism classes of noncommutative deformations in type $D_n$ is isomorphic to a vector space of dimension $n$.References
- Tomoyuki Arakawa, Representation theory of $\scr W$-algebras, Invent. Math. 169 (2007), no. 2, 219–320. MR 2318558, DOI 10.1007/s00222-007-0046-1
- V. V. Bavula, Finite-dimensionality of $\textrm {Ext}^n$ and $\textrm {Tor}_n$ of simple modules over a class of algebras, Funktsional. Anal. i Prilozhen. 25 (1991), no. 3, 80–82 (Russian); English transl., Funct. Anal. Appl. 25 (1991), no. 3, 229–230 (1992). MR 1139880, DOI 10.1007/BF01085496
- V. V. Bavula, Generalized Weyl algebras and their representations, Algebra i Analiz 4 (1992), no. 1, 75–97 (Russian); English transl., St. Petersburg Math. J. 4 (1993), no. 1, 71–92. MR 1171955
- V. V. Bavula and D. A. Jordan, Isomorphism problems and groups of automorphisms for generalized Weyl algebras, Trans. Amer. Math. Soc. 353 (2001), no. 2, 769–794. MR 1804517, DOI 10.1090/S0002-9947-00-02678-7
- P. Boddington, No-cycle algebras and representation theory, Ph.D. thesis, University of Warwick, 2004.
- —, Deformations of type $D$ kleinian singularities, arXiv:math.RA/0612853 (2006).
- E. Brieskorn, Singular elements of semi-simple algebraic groups, Actes du Congrès International des Mathématiciens (Nice, 1970) Gauthier-Villars, Paris, 1971, pp. 279–284. MR 0437798
- William Crawley-Boevey and Martin P. Holland, Noncommutative deformations of Kleinian singularities, Duke Math. J. 92 (1998), no. 3, 605–635. MR 1620538, DOI 10.1215/S0012-7094-98-09218-3
- Jan de Boer and Tjark Tjin, Quantization and representation theory of finite $W$ algebras, Comm. Math. Phys. 158 (1993), no. 3, 485–516. MR 1255424, DOI 10.1007/BF02096800
- Alberto De Sole and Victor G. Kac, Finite vs affine $W$-algebras, Jpn. J. Math. 1 (2006), no. 1, 137–261. MR 2261064, DOI 10.1007/s11537-006-0505-2
- Jacques Dixmier, Sur les algèbres de Weyl, Bull. Soc. Math. France 96 (1968), 209–242 (French). MR 242897, DOI 10.24033/bsmf.1667
- Jacques Dixmier, Quotients simples de l’algèbre enveloppante de ${\mathfrak {s}}{\mathfrak {l}}_{2}$, J. Algebra 24 (1973), 551–564 (French). MR 310031, DOI 10.1016/0021-8693(73)90127-0
- Wee Liang Gan and Victor Ginzburg, Quantization of Slodowy slices, Int. Math. Res. Not. 5 (2002), 243–255. MR 1876934, DOI 10.1155/S107379280210609X
- Timothy J. Hodges, Noncommutative deformations of type-$A$ Kleinian singularities, J. Algebra 161 (1993), no. 2, 271–290. MR 1247356, DOI 10.1006/jabr.1993.1219
- John McKay, Graphs, singularities, and finite groups, The Santa Cruz Conference on Finite Groups (Univ. California, Santa Cruz, Calif., 1979) Proc. Sympos. Pure Math., vol. 37, Amer. Math. Soc., Providence, R.I., 1980, pp. 183–186. MR 604577
- Alexander Premet, Special transverse slices and their enveloping algebras, Adv. Math. 170 (2002), no. 1, 1–55. With an appendix by Serge Skryabin. MR 1929302, DOI 10.1006/aima.2001.2063
- Peter Slodowy, Simple singularities and simple algebraic groups, Lecture Notes in Mathematics, vol. 815, Springer, Berlin, 1980. MR 584445, DOI 10.1007/BFb0090294
- S. P. Smith, A class of algebras similar to the enveloping algebra of $\textrm {sl}(2)$, Trans. Amer. Math. Soc. 322 (1990), no. 1, 285–314. MR 972706, DOI 10.1090/S0002-9947-1990-0972706-5
Additional Information
- Paul Levy
- Affiliation: Section Mathematics, Ecole Polytechnique Federal de Lausanne, Bâtiment BCH, CH-1015 Lausanne, Switzerland
- Email: paul.levy@epfl.ch
- Received by editor(s): March 21, 2007
- Published electronically: December 23, 2008
- © Copyright 2008
American Mathematical Society
The copyright for this article reverts to public domain 28 years after publication. - Journal: Trans. Amer. Math. Soc. 361 (2009), 2351-2375
- MSC (2000): Primary 16S80, 16S38
- DOI: https://doi.org/10.1090/S0002-9947-08-04593-5
- MathSciNet review: 2471922