Microlocal characterization of Lusztig sheaves for affine quivers and 𝑔-loops quivers

Hennecart, Lucien

doi:10.1090/ert/595

Microlocal characterization of Lusztig sheaves for affine quivers and $g$-loops quivers
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by Lucien Hennecart

Represent. Theory 26 (2022), 17-67

DOI: https://doi.org/10.1090/ert/595

Published electronically: February 11, 2022

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Abstract:

We prove that for extended Dynkin quivers, simple perverse sheaves in Lusztig category are characterized by the nilpotency of their singular support. This proves a conjecture of Lusztig in the case of affine quivers. For cyclic quivers, we prove a similar result for a larger nilpotent variety and a larger class of perverse sheaves. We formulate conjectures concerning similar results for quivers with loops, for which we have to use the appropriate notion of nilpotent variety, due to Bozec, Schiffmann and Vasserot. We prove our conjecture for $g$-loops quivers ($g\geq 2$).

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