Previous Conferences & Workshops

Nov
21
2022

3D Dimer Block Party

Scott Sheffield and Catherine Wolfram
3:15pm|Simonyi Hall Common Room

Come play with 250 physical wooden blocks and join us in thinking about a simple open problem for dimers in 3D. No prior knowledge required. We’ll start with an ~10 minute presentation explaining the problem and then suggest some things for everyone...

Nov
21
2022

Members' Colloquium

Local Systems, Positivity and (Non-Commutative) Markov Numbers
2:00pm|Simonyi Hall 101 and Remote Access - see Zoom link below

Markov numbers are positive integers that appear in solutions of the equation x^2+y^2+z^2=3xyz. They also appear naturally when one tries to parametrize positive $SL_2(R)$-local systems on a one punctured torus. In this talk I will explain that...

Nov
21
2022

Computer Science/Discrete Mathematics Seminar I

Strong XOR Lemma for Communication with Bounded Rounds
Huacheng Yu
11:15am|Simonyi 101 and Remote Access

In this talk, we show a strong XOR lemma for bounded-round two-player randomized communication.  For a function f:X×Y→{0,1}, the n-fold XOR function f^⊕n:X^n×Y^n→{0,1} maps n input pairs (x_1,...,x_n), (y_1,...,y_n) to the XOR of the n output bits f...

Nov
18
2022

Probability Seminar

Lozenge Tilings and the Gaussian Free Field on a Cylinder
Marianna Russkikh
11:15am|Simonyi 101 and Remote Access

We discuss new results on lozenge tilings on an infinite cylinder, which may be analyzed using the periodic Schur process introduced by Borodin. Under one variant of the q^vol measure, corresponding to random cylindric partitions, the height...

Nov
17
2022

Joint IAS/PU Number Theory Seminar

Toward a Theory of Prime Detecting Sieves
4:30pm|Simonyi Hall 101 and Remote Access

Given a set of integers, we wish to know how many primes there are in the set.  Modern tools allow us to obtain an asymptotic for the number of primes, or at least a lower bound of the expected order, assuming certain strength Type-I information...

Nov
17
2022

Verlinde Dimension Formula

Verlinde Dimension Formula for the Space of Conformal Blocks and the Moduli of G-bundles
10:15am|Simonyi 101 and Remote Access

Let G be a simply-connected complex semisimple algebraic group and let C be a smooth projective curve of any genus. Then, the moduli space of semistable G-bundles on C admits so called determinant line bundles. E. Verlinde conjectured a remarkable...

Nov
16
2022

Analysis and Mathematical Physics

Branched Regularity Theorems for Stable Minimal Hypersurfaces Near Classical Cones of Density Q+1/2
4:30pm|Simonyi 101 and Remote Access

The presence of branch points and so-called density gaps heavily complicates the regularity theory for minimal submanifolds or, more precisely, stationary integral varifolds. Density gaps illustrate a mismatched symmetry between nearby varifolds...

Nov
15
2022

Special Year Research Seminar

Rigidity of Kleinian Groups via Self-Joinings
2:00pm|Simonyi 101 and Remote Access

A discrete subgroup of PSL(2,C) is called a Kleinian group. I will present  a criterion on  when a discrete faithful representation of a Kleinian group into PSL(2,C) is a conjugation, or equivalently  a criterion on when an equivariant embedding of...

Nov
15
2022

Computer Science/Discrete Mathematics Seminar II

10:30am|Simonyi Hall 101 and Remote Access

In this talk I will first review some basics about communication complexity.  Secondly I will survey some (old and new) equivalences between central problems in communication complexity and related questions in additive combinatorics.  In particular...