• 2019 Aug 19

NT & AG Seminar: Maarten Solleveld (Radboud) "Cuspidal Langlands parameters"

2:00pm to 3:00pm

Location:

Ross 70
In the representation theory of reductive p-adic groups, a lot of general structure was developed by Bernstein: supercuspidal representations, cuspidal support, Bernstein components and so on.
• 2019 Aug 07

NT & AG Seminar: Sandeep Varma "Bernstein projectors for SL(2)"

2:00pm to 3:00pm

Location:

Ross 70
Let G be the group SL(2) over a finite extension F of Q_p, p odd. For a fixed r ≥ 0, we identify the elements of the Bernstein center of G supported in the Moy-Prasad G-domain G_{r^+}, by characterizing them spectrally. We study the behavior of convolution with such elements on orbital integrals of functions in C^∞_c(G(F)), proving results in the spirit of semisimple descent. These are ‘depth r versions’ of results proved for general reductive groups by J.-F. Dat, R. Bezrukavnikov, A. Braverman and D. Kazhdan.
• 2019 Jul 01

Minicourse: Jared Weinstein (Boston University "Geometrization of the local Langlands program"

2:00pm to 4:00pm

Location:

Ross 70
Prof. Jared Weinstein (Boston University) will give a series of 3 talks titled "Geometrization of the local Langlands program"
• 2019 Jun 30

Minicourse: Jared Weinstein (Boston University "Geometrization of the local Langlands program"

2:00pm to 4:00pm

Location:

Ross 70
Prof. Jared Weinstein (Boston University) will give a series of 3 talks titled "Geometrization of the local Langlands program"
• 2019 Jun 26

Minicourse: Jared Weinstein (Boston University "Geometrization of the local Langlands program"

2:00pm to 4:00pm

Location:

Ross 70
Prof. Jared Weinstein (Boston University) will give a series of 3 talks titled "Geometrization of the local Langlands program"
• 2019 Jun 17

NT & AG Lunch: Michael Temkin "The explicit local and global class field theory"

1:00pm to 2:00pm

Location:

Faculty lounge
I will finish the theory of Lubin-Tate, and start the last topic of this series -- Drinfeld's elliptic modules and CFT of function fields.
• 2019 Jun 10

NT & AG Seminar - Dan Edidin - An intrinsic characterization of cofree representations of reductive groups''

1:00pm to 2:00pm

Location:

Ross 70
Title: An intrinsic characterization of cofree representations of reductive groups
• 2019 Jun 03

NT & AG Seminar: Shuddhodan K V (HUJI) "Self maps of varieties over finite fields"

2:30pm to 3:30pm

Location:

Ross building 70
Title: Title: Self maps of varieties over finite fields Abstract: Esnault and Srinivas proved that as in Betti cohomology over the complex numbers, the value of the entropy of an automorphism of a smooth proper surface over a finite field $\F_q$ is taken in the subspace spanned by algebraic cycles inside $\ell$-adic cohomology. In this talk we will discuss some analogous questions in higher dimensions motivated by their results and techniques.
• 2019 Jun 03

NT & AG Lunch: Michael Temkin "The explicit local class field theory"

1:00pm to 2:00pm

Location:

Faculty lounge, Math building
I'll tell a couple of anecdotes related to imaginary quadratic fields (e.g. primes in the sequence n^2+n+41), and then open a new story -- local CFT and the explicit construction of K^ab due to Lubin-Tate.
• 2019 May 27

NT & AG Seminar "A dream desingularization algorithm", Michael Temkin

2:30pm to 3:30pm

Abstract: Any birational geometer would agree that the best algorithm for resolution of singularities should run by defining a simple invariant of the singularity and iteratively blowing up its maximality locus. The only problem is that already the famous example of Whitney umbrella shows that this is impossible, and all methods following Hironaka had to use some history and resulted in more complicated algorithms. Nevertheless, in a recent work with Abramovich and Wlodarczyk we did construct such an algorithm, and an independent description of a similar