# Algebra, Topology and the Grothendieck-Teichmüller group

August 28, 2022 to September 2, 2022
Europe/Zurich timezone

## Towards a $\mathrm{KRV_2}$ action in the derived category

Aug 29, 2022, 5:00 PM
50m

### Speaker

Chris Rogers (Reno)

### Description

Let $X$ be a smooth complex variety. In previous joint work with V. Dolgushev and T. Willwacher, we exhibited an explicit action of $\mathrm{GRT_1}$ on the Gerstenhaber algebra $H^\ast(X,\mathcal{T}_{\mathrm{poly}})$. This action produces a large supply of nontrivial $\mathrm{GRT}_1$ representations. After reviewing this construction, I will discuss extending it to an action of $\mathrm{KRV}_2$ on the set of those isomorphisms $H^\ast(X,\mathcal{T}_{\mathrm{poly}}) \cong HH^*(X)$ which correct the HKR map between the harmonic and Hochschild structures of $X$. A key ingredient is the recent characterization of $\mathrm{KRV}_2$ by Z. Dancso, I. Halacheva, and M. Robertson as automorphisms of a wheeled PROP. This is joint work in progress with M. Robertson.

### Presentation materials

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