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Mod $\ell$ Weil representations and Deligne--Lusztig inductions for unitary groups

Published 14 Feb 2020 in math.RT and math.NT | (2002.05872v2)

Abstract: We study the mod $\ell$ Weil representation of a finite unitary group and related Deligne--Lusztig inductions. In particular, we study their decomposition as representations of a symplectic group, and give a construction of a mod $\ell$ Howe correspondence for $(\mathrm{Sp}_{2n},\mathrm{O}_2-)$ including the case where $p=2$.

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