Seminars Sorted by Series

Working Seminar on Algebraic Number Theory

Mar
28
2019

Working Seminar on Algebraic Number Theory

Hida theory and Ohta's canonical comparison map
Giada Grossi
2:15pm|Princeton University, Fine 1201

From Romyar's AWS notes:

  • Sections 4.1 and 4.2.

Regarding the proof of Ohta's comparison isomorphism:

  • Discuss Fukaya-Kato Section 1.7, which explains some p-adic Hodge theory background.
  • Discuss some elements of Ohta's proof, from Sections 3...
Apr
04
2019

Working Seminar on Algebraic Number Theory

p-adic L-functions in one and two variables
Kim Tuan Do
2:15pm|Simonyi Hall 101

Introduce the L-function, and then the p-adic L-function, of a cusp form, and the of a Hida family of cups forms. What we need is in Fukaya-Kato Sections 4.4-4.5. See also: Mazur-Tate-Teitelbaum and Mazur's "Anomalous eigenforms" note.

Working Seminar on Nonabelian Hodge Theory

Working Seminar on Representation Theory

Oct
19
2016

Working Seminar on Representation Theory

Categorification of the positive half of $\mathbb{U}_q(\mathfrak{sl}_2)$
11:00am|S-101

We will talk about the categorification of the positive half of the quantum group $\mathbb{U}_q(\mathfrak{sl}_2)$ using the module categories over NilHecke algebras. We hope to explain the idea of categorification using this example.

Nov
09
2016

Working Seminar on Representation Theory

$\mathbb C$-representation theory of $p$-adic groups through the glass of types
11:00am|S-101

It is well known that representations of open compact subgroups (called types) play a fundamental role in studying representations of $p$-adic groups. We give an overview of the theory (after Bernstein, Moy-Prasad, Bushnell-Kutzko) in connection...

Dec
07
2016

Working Seminar on Representation Theory

Mirror symmetry on the Bruhat-Tits building and representations of $p$-adic groups
11:00am|S-101

It is an old question in representation theory whether any finitely-generated smooth representation of a $p$-adic group has a resolution by representations induced from (finite-dimensional representations of) compact subgroups. We construct such a...

Jan
27
2017

Working Seminar on Representation Theory

A Gelfand-Graev Formula and Stable Transfer Factors for $mathrm{SL}_n$
Daniel Johnstone
2:00pm

A result of Gelfand and Graev shows that the supercuspidal representations of $\mathrm{SL}_2$ are neatly parameterized by characters of elliptic tori, and that the stable character data for all such representations may be collected into a single...

Feb
10
2017

Working Seminar on Representation Theory

Canonical bases arising from quantum symmetric pairs
2:00pm

A quantum symmetric pair consists of a quantum group and its coideal subalgebra. The coideal subalgebra is a quantum analog of the fixed point subalgebra of the enveloping algebra with respect to certain involution. In this talk, we shall describe...

Feb
24
2017

Working Seminar on Representation Theory

Cocenters and representations of affine Hecke algebras
2:00pm

It is known that the number of conjugacy classes of a finite group equals the number of irreducible representations (over complex numbers). The conjugacy classes of a finite group give a natural basis of the cocenter of its group algebra. Thus the...

Workshop on Additive Combinatorics and Algebraic Connections

Oct
24
2022

Workshop on Additive Combinatorics and Algebraic Connections

Random Character Varieties
10:00am|Simonyi 101 and Remote Access

Abstract: Irreducibility of random polynomials of large degree has been studied recently in works by several authors (in particular by Bary-Soroker, Kozma, Koukoulopoulos and by Varju and myself). We study analogous problems in the setting of word...

Oct
24
2022

Workshop on Additive Combinatorics and Algebraic Connections

The Polynomial Method and High-degree Varieties
Miguel Walsh
11:15am|Simonyi 101 and Remote Access

Abstract: We will discuss some results on high-degree varieties designed to expand the reach of the polynomial method and explain their applications in incidence geometry.

Oct
24
2022

Workshop on Additive Combinatorics and Algebraic Connections

The Failure of the Periodic Tiling Conjecture
2:00pm|Simonyi 101 and Remote Access

Abstract: Translational tiling is a covering of a space using translated copies of a building block, called a "tile", without any positive measure overlaps. What are the possible ways that a space can be tiled?
The most well known conjecture in this...

Oct
25
2022

Workshop on Additive Combinatorics and Algebraic Connections

Polynomial Maps With Noisy Input-Distributions
Jop Briet
10:00am|Simonyi 101 and Remote Access

Abstract: A problem from theoretical computer science posed by Buhrman asks to show that a certain class of circuits (NC0[+]) is bad at decoding error correcting codes under random noise. (This would be in contrast with an analogous class of quantum...