Drinfeld Hecke algebras for symmetric groups in positive characteristic

Abstract

We investigate deformations of skew group algebras arising from the action of the symmetric group on polynomial rings over fields of arbitrary characteristic. Over the real or complex numbers, Lusztig’s graded affine Hecke algebra and analogs are all isomorphic to Drinfeld Hecke algebras, which include the symplectic reflection algebras and rational Cherednik algebras. Over fields of prime characteristic, new deformations arise that capture both a disruption of the group action and also a disruption of the commutativity relations defining the polynomial ring. We classify deformations for the symmetric group acting via its natural (reducible) reflection representation.

Keywords:

• Deformations
• Drinfeld Hecke algebra
• graded affine Hecke algebra
• modular representations
• symmetric group

2020 MATHEMATICS SUBJECT CLASSIFICATION:

• 20C08
• 20C20
• 16E40

Acknowledgments

The authors thank the referee for a very careful reading of the article and many helpful suggestions.

Additional information

Funding

A. V. Shepler was partially supported by Simons Foundation Grant #42953.