Department of Mathematics,
University of California San Diego
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Math 209 - Number Theory Seminar
Zuhair Mullath
University of Massachusetts, Amherst
Unobstructed Galois deformation problems associated to GSp(4)
Abstract:
To a cuspidal automorphic representation of GSp(4) over $\mathbb Q$, one can associate a compatible system of Galois representations $\{\rho_p\}_{p \; \mathrm{prime}}$. For $p$ sufficiently large, the deformation theory of the mod-$p$ reduction $\overline \rho_p$ is expected to be unobstructed -- meaning the universal deformation ring is a power series ring. The global obstructions to deforming $\overline \rho_p$ is controlled by certain adjoint Bloch-Kato Selmer groups, which are expected to be trivial for $p$ large enough. \\ \\ I will talk about some recent results showing that there are no local obstructions to the deformation theory of $\overline \rho_p$ for almost all $p$. \\ \\ This is joint work with M. Broshi, C. Sorensen, and T. Weston.
Host: Kiran Kedlaya
February 18, 2021
1:00 PM
Location: See https://www.math.ucsd.edu/\~{}nts/
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