Cédric Bonnafé Institut Montpelliérain Alexander Grothendieck français


Geometry, Topology, Algebra Team

GDR TLAG

Ph.D. Students

Books
Preprints
Publications
Proceedings
Thesis, HDR
Courses
Talks
Senior Researcher at the CNRS

Head of the Geometry, Topology, Algebra team

Address
Université de Montpellier
Institut Montpelliérain Alexander Grothendieck
Case Courrier 051
Place Eugène Bataillon
34095 MONTPELLIER Cedex
FRANCE

Office 327
Tel : +33-467-14-93-38
Fax : +33-467-14-93-16

E-mail
surname.name@umontpellier.fr
(surname=cedric, name=bonnafe)


Kazhdan-Lusztig Cells with Unequal Parameters, Algebra and Applications 24, Springer-Verlag London, Ltd., London, 2017. xxv+348 pp.
Representations of SL(2,q), Algebra and Applications 13, Springer-Verlag London, Ltd., London, 2011. xxii+186 pp.
Traduit par G. Williamson


Ph.D. Students


On-going

Finished



Books :


Kazhdan-Lusztig Cells with Unequal Parameters, Algebra and Applications 24, Springer-Verlag London, Ltd., London, 2017. xxv+348 pp.

Representations of SL(2,q), Algebra and Applications 13, Springer-Verlag London, Ltd., London, 2011. xxii+186 pp.
Traduit par G. Williamson

Preprints :

Publications :

  1. A construction of the Shephard-Todd group G32 through the Weyl group of type E6, preprint (2023), to appear in Portug. Mat., arxiv:2310.19560

  2. Regular automorphisms and Calogero-Moser families, to appear in Rev. Unión Mat. Argent., preprint (2021). arXiv:2112.13685.

  3. On the Calogero-Moser space associated with dihedral groups II. The equal parameter case, to appear in Ann. Math. Blaise Pascal, preprint (2021). arXiv:2112.12401.

  4. With U. Thiel, Computational aspects of Calogero-Moser spaces, Selecta Math. 29 (2023). arXiv:2112.15495.

  5. With A. Sarti, Complex reflection groups and K3 surfaces II. The groups G29, G30 and G31, J. Korean Math. Soc. 60 (2023), 695-743. arXiv:2112.12400.

  6. Automorphisms and symplectic leaves of Calogero-Moser spaces, J. Aust. Math. Soc. 115 (2023), 26-57. arXiv:2112.12405.

  7. Calogero-Moser spaces vs unipotent representations, to appear in Pure and App. Math. Quart., arXiv:2112.13684.

  8. Avec G. Bellamy, B. Fu, D. Juteau, P. Levy et E. Sommers, A new family of isolated symplectic singularities with trivial local fundamental group, Proc. London Math. Soc. 126 (2023), 1496-1521. arXiv:2112.15494.

  9. Avec J. Germoni, Calogero-Moser cells of dihedral groups at equal parameters, Ann. Math. Blaise Pascal 29 (2022), 187-208. arXiv:2112.13683.

  10. With A. Sarti, Complex reflection groups and K3 surfaces I, Épijournal de Géométrie Algébrique 5 (2021), arXiv:2005.04460.

  11. With A. Sarti, K3 surfaces with maximal finite automorphism groups containing M20, Ann. Inst. Fourier. 71 (2021), 711-730. arXiv:1910.05955.

  12. With R. Maksimau, Fixed points in smooth Calogero-Moser spaces, Ann. Inst. Fourier. 71 (2021), 643-678. arXiv:1803.04287.

  13. With R. Rouquier, An asymptotic cell category for cyclic groups, J. of Alg. 558 (2020), 102-128. arXiv:1708.09730.

  14. With O. Dudas and R. Rouquier, Translation by the full twist and Deligne-Lusztig varieties, J. Algebra 558 (2020), 129-145 arXiv:1810.09403.

  15. With P. Shan, On the cohomology of Calogero-Moser spaces, Int. Math. Res. Not. IMRN 2020, 1091-1111. arXiv:1708.09729.

  16. Some singular curves and surfaces arising from invariants of complex reflection groups, to appear in Exper. Math. arXiv:1807.01056. For the smoothness of the exposition, I have decided to put the Magma codes in another rather uninteresting text, but which allows to check computations:

  17. On the Calogero-Moser space associated with dihedral groups, Ann. Math. Blaise Pascal 25 (2018), 265-298. arXiv:1708.09728.

  18. With J.-F. Dat and R. Rouquier, Derived categories and Deligne-Lusztig varieties II, Annals of Mathematics 185 (2017), 609-670. arXiv:1511.04714.

  19. Blocks of the Grothendieck ring of equivariant bundles on a finite group, New Zealand J. Math. 48 (2018), 157-163. arXiv:1405.5903.

  20. With M. Geck, Hecke algebras with unequal parameters and Vogan's left cell invariants, Representations of reductive groups (célébrant les 60 ans de David Vogan), Progr. Math. 312, Birkhäuser/Springer, Cham, 2015. arXiv:1502.01661.

  21. Cells and cacti, Int. Math. Res. Notices (2015). arXiv:1506.07737.

  22. Constructible characters and b-invariant, Bull. of the Belgian Math. Soc. 22 (2015), 377-390. arXiv:1302.2721.

  23. With M. Geck, Conjugacy classes of involutions and Kazhdan-Lusztig cells, Represent. Theory 18 (2014), 155-182. arXiv:1205.4092.

  24. With R. Rouquier, Calogero-Moser versus Kazhdan-Lusztig cells, Pacific J. Math. 261 (2013), 45-51. arXiv:1201.0585.

  25. A progenerator for representations of SL(n,q) in transverse characteristic, Comptes Rendus Math. 349 (2011), 731-733. arxiv:1103.4031

  26. With G. Kemper, Some complete intersection symplectic quotients in positive characteristic: invariants of a vector and a covector, J. of Algebra 335 (2011), 96-112. arxiv:1006.4762

  27. With J. Michel, Computational proof of the Mackey formula for q > 2, Journal of Algebra 327 (2011), 506-526. arxiv:1003.4922

  28. With M. Geck, L. Iancu and T. Lam, On domino insertion and Kazhdan-Lusztig cells in type $B_n$, Representation theory of algebraic groups and quantum groups, 33-54, Progress in Mathematics, 284, Birkhäuser/Springer, New York, 2010. arxiv:math/0609279

  29. On Kazhdan-Lusztig cells in type B, Journal of Alg. Comb. 31 (2010), 53-82. arxiv:0806.0214. Erratum to: On Kazhdan-Lusztig cells in type $B$, J. Algebraic Combin. 35 (2012), 515-517. HAL

  30. With M. Dyer, Semidirect product decomposition of Coxeter groups, Comm. in Algebra 38 (2010), 1549-1574. arxiv:0805.4100

  31. Semicontinuity properties of Kazhdan-Lusztig cells, New Zealand Journal of Mathematics 39 (2009), 171-192. arxiv:0808.3522

  32. Automorphisms of Coxeter groups and Lusztig's conjectures for Hecke algebras with unequal parameters, Nagoya J. Math. 195 (2009), 153-164. arxiv:0805.4269

  33. With R. Rouquier, Compactification des variétés de Deligne-Lusztig, Annales de l'Institut Fourier 59 (2009), 621-640. arxiv:0801.1556

  34. With N. Jacon, Cellular structures on Hecke algebras of type B, Journal of Algebra 321 (2009), 3089-3111 (volume célébrant les 60 ans de G. Lehrer). arxiv:0712.3662

  35. Topologie sur l'ensemble des parties positives d'un réseau, Ann. Sc. Math. Québec 32 (2008), 11-27. arxiv:0808.3518

  36. With G. Pfeiffer, Around Solomon's descent algebras, Algebras and Representation Theory 11 (2008), 577-602. arxiv:math/0601317

  37. With R. Kessar, On the endomorphism algebra of modular Gelfand-Graev representations, Journal of Algebra 320 (2008), 2847-2870. arxiv:0708.3540

  38. Representation theory of Mantaci-Reutenauer algebras, Algebras and Representation Theory 11 (2008), 307-346. arxiv:math/0605621

  39. With R. Rouquier, Affineness of Deligne-Lusztig varieties for minimal length elements, Journal of Algebra 320 (2008), 1200-1206. arXiv:0708.1246

  40. On the character ring of a finite group, Publ. Math. Univ. Franche-Comté (2006), 5-23. arxiv:math/0604224

  41. Sur les caractères des groupes réductifs finis a centre non connexe : applications aux groupes spéciaux linéaires et unitaires Astérisque 306 (2006), 165 pages. arxiv:math/0504078

  42. Two-sided cells in type B (asymptotic case), J. Algebra 304 (2006), 216-236. arxiv:math/0502086

  43. With R. Rouquier, Coxeter orbits and modular representations Nagoya J. Math. 183 (2006), 1-34 (volume célébrant les 60 ans de G. Lusztig). arxiv:math/0511737

  44. With G. Lehrer and J. Michel, Twisted invariant theory for reflection groups, Nagoya J. Math. 182 (2006), 135-170 (volume célébrant les 60 ans de G. Lusztig). arxiv:math/0505087

  45. With R. Rouquier, On the irreducibility of Deligne-Lusztig varieties, Comptes Rendus Math. Acad. Sci. Paris 343 (2006), 37-39. arxiv:math/0601373

  46. A note on the Grothendieck ring of the symmetric group, Comptes Rendus Math. Acad. Sci. Paris 342 (2006), 533-538. arxiv:math/0511043

  47. With C. Hohlweg, Generalized descent algebra and construction of irreducible characters of hyperoctahedral groups, With an appendix by P. Baumann and C. Hohlweg : Comparison with Specht's construction, Ann. Inst. Fourier 56 (2006), 131-181. arxiv:math/0409199

  48. Quasi-isolated elements in reductive groups, Comm. Algebra 33 (2005), 2315-2337. arxiv:math/0402276

  49. Actions of relative Weyl groups II, J. Group Theory 8 (2005), 351-387. arxiv:math/0304500,

  50. Actions of relative Weyl groups I, J. Group Theory 7 (2004), 1-37. arxiv:math/0111224

  51. Sur les éléments unipotents réguliers des sous-groupes de Levi, Canad. J. Math. 56 (2004), 246-276. pdf

  52. A note on centralizers of unipotent elements, Ital. J. Pure Appl. Math. 16 (2004), 163-171. pdf

  53. Une (nouvelle ?) construction du groupe de réflexions complexe $G_{31}$, Bull. Math. Soc. Sci. Math. Roumanie (N.S.) 45(93) (2002), 133-143 (2003). arxiv:math/0302042

  54. With L. Iancu, Left cells in type $B_n$ with unequal parameters, Representation Theory 7 (2003), 587-609. arxiv:math/0302037

  55. With R. Rouquier, Catégories dérivées et variétés de Deligne-Lusztig, Publ. I.H.E.S. 97 (2003), 1-59. arxiv:math/0201146

  56. With D. Bessis and R. Rouquier, Quotients et extensions de groupes de réflexion, Math. Ann. 323 (2002), 405-436. arxiv:math/0102137

  57. Opérateurs de torsion dans SL(n,q) et SU(n,q), Bull. S.M.F. 128 (2000), 309-345. pdf

  58. Mackey formula in type A, Proc. London Math. Soc. 80 (2000), 545-574. pdf. Corrigenda : Mackey formula in type A, Proc. London Math. Soc. 86 (2003), 435-442. pdf

  59. Regular unipotent elements, C.R. Acad. Sc. 328 (1999), 275-280. pdf

  60. On a theorem of Shintani, J. of Algebra 218 (1999), 229-245. pdf

  61. Produit en couronne de groupes linéaires, J. of Algebra 211 (1999), 57-98. pdf

  62. Formule de Mackey pour q grand, J. of Algebra 201 (1998), 207-232. pdf

Proceedings:

  • Endomorphism algebra of an induced cuspidal character sheaf, Workshop Quantum groups and related topics, Karuizawa (Japon, Juin 2003), pdf

Other texts:

Thesis, Habilitation :

Courses :

  • Master course at the Université de Franche-Comté (2004) : Invariants polynomiaux des groupes finis - groupes de réflexions, en construction (!). pdf

  • Course Algebra IV (Santa Cruz, Fall 2006) : Modules (tensor product, Jacobson radical, projective, injective...) and Algebraic geometry, en construction (!). pdf (la partie sur les modules est essentiellement tirée des notes du cours de R. Boltje)

  • Correction de l'épreuve de Mathématiques générales (agrégation 1998) pdf

  • Correction partielle de l'épreuve de Mathématiques générales (agrégation 1994) pdf

Talks :