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Number Theory Seminar: Semisimplicity and CM lifts

SEMINARS, NUMBER THEORY

November 15, 2023      3:00 pm
Speaker: Ananth Shankar - Northwestern University

Consider the setting of a smooth variety $S$ over $\mathbb{F}_q$, and an $\ell$-adic local on $S$ which has finite determinant and is geometrically irreducible. Work of Lafforgue proves that such...
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Number Theory Seminar: A relative Oda’s criterion

SEMINARS, NUMBER THEORY

October 11, 2023      3:00 pm
Speaker: Alex Betts - Harvard University

The Neron--Ogg--Shafarevich criterion asserts that an abelian variety over ℚp has good reduction if and only if the Galois action on its ℤℓ-linear Tate module is unramified (for ℓ different...
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Number Theory Seminar: Tate Classes and Endoscopy for GSp₄

SEMINARS, NUMBER THEORY

October 4, 2023      3:00 pm
Speaker: Naomi Sweeting - Harvard University

Weissauer proved using the theory of endoscopy that the Galois representations associated to classical modular forms of weight two appear in the middle cohomology of both a modular curve and...
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Number Theory Seminar: Harris–Venkatesh plus Stark

SEMINARS, NUMBER THEORY

September 20, 2023      3:00 pm
Speaker: Robin Zhang - MIT

The class number formula describes the behavior of the Dedekind zeta function at $s=0$ and $s=1$. The Stark conjecture extends the class number formula, describing the behavior of Artin $L$-functions...
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