OIST Representation Theory Seminar
Tuesday, September 15, 2020 - 16:30 to 17:30
Speaker: Chris Bowman, University of Kent
Title: Tautological p-Kazhdan–Lusztig Theory for cyclotomic Hecke algebras
Abstract: We discuss a new explicit isomorphism between (truncations of) quiver Hecke algebras and Elias–Williamson’s diagrammatic endomorphism algebras of Bott–Samelson bimodules. This allows us to deduce that the decomposition numbers of these algebras (including as examples the symmetric groups and generalised blob algebras) are tautologically equal to the associated p-Kazhdan–Lusztig polynomials, provided that the characteristic is greater than the Coxeter number. This allows us to give an elementary and explicit proof of the main theorem of Riche–Williamson’s recent monograph and extend their categorical equivalence to cyclotomic Hecke algebras, thus solving Libedinsky–Plaza’s categorical blob conjecture.
Zoom info can be found on the seminar webpage.