Monodromic model for Khovanov–Rozansky homology

<jats:title>Abstract</jats:title> <jats:p>We describe a new geometric model for the Hochschild cohomology of Soergel bimodules based on the monodromic Hecke category studied earlier by the first author and Yun. Moreover, we identify the objects representing individu...

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Bibliographic Details
Main Authors: Bezrukavnikov, Roman, Tolmachov, Kostiantyn
Other Authors: Massachusetts Institute of Technology. Department of Mathematics
Format: Article
Language:English
Published: Walter de Gruyter GmbH 2022
Online Access:https://hdl.handle.net/1721.1/145612
Description
Summary:<jats:title>Abstract</jats:title> <jats:p>We describe a new geometric model for the Hochschild cohomology of Soergel bimodules based on the monodromic Hecke category studied earlier by the first author and Yun. Moreover, we identify the objects representing individual Hochschild cohomology groups (for the zero and the top degree cohomology this reduces to an earlier result of Gorsky, Hogancamp, Mellit and Nakagane). These objects turn out to be closely related to explicit character sheaves corresponding to exterior powers of the reflection representation of the Weyl group. Applying the described functors to the images of braids in the Hecke category of type A we obtain a geometric description for Khovanov–Rozansky knot homology, essentially different from the one considered earlier by Webster and Williamson.</jats:p>