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Preprint Sep 2026

The Morita classes are nonzero

We prove that all Morita classes $\mu_k \in H_{4k}(Aut(F_{2k+2});\mathbb{Q})$ are nonzero using a novel description of the Hopf algebra structure on Steinberg homology. We prove analogous results with twisted coefficients. Our results disprove a case of a finiteness conjecture of Kontsevich.

A. Kupers, Jeremy Miller, Peter Patzt · 1 citation
Preprint Sep 2026

Double Steinberg coinvariants for special linear groups

For a field $F$ we study the coinvariants for the $SL_n(F)$-action on the double Steinberg module $St_n(F) \otimes St_n(F)$ and show they have a rich algebraic structure: for $n = 2$ it is the Grothendieck-Witt group of $F$, and for all $n$ they assemble to a graded nonunital $\mathbb{Z}[F^\times]$-algebra, whose ratio...

Tatiana Abdelnaim, David Chan, A. Kupers et al. · 0 citations

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