Previous Conferences & Workshops

Dec
15
2022

Joint IAS/PU Number Theory Seminar

A Motivic Circle Method
4:30pm|Princeton University, Fine Hall 224

The circle method has been a versatile tool in the study of rational points on hypersurfaces. More recently, a version of the method over function fields, combined with spreading out techniques, has led to information about moduli spaces of rational...

Dec
14
2022

Mathematical Conversations

Rational and Integral Points on Elliptic Curves
6:00pm|Birch Garden, Simons Hall

We discuss some questions that arise when studying rational and integral points on curves, especially elliptic curves. For example, for a "random" such curve, how many rational points should it have? This will be a talk suitable for a general math...

Dec
14
2022

Analysis and Mathematical Physics

Classical Turbulence as Quantum Geometry
Alexander Migdal
4:30pm|Simonyi 101 and Remote Access

The loop equation for circulation PDF as functional of the loop shape is derived from the Hopf equation. This equation is $\textbf{exactly}$ equivalent to the Schrödinger equation in loop space, with viscosity playing the role of Planck's constant...

Dec
14
2022

Analysis and Mathematical Physics

Additive Energy of Regular Measures in One and Higher Dimensions, and the Fractal Uncertainty Principle
3:00pm|Simonyi 101 and Remote Access

We obtain new bounds on the additive energy of (Ahlfors-David type) regular measures in both one and higher dimensions, which implies expansion results for sums and products of the associated regular sets, as well as more general nonlinear functions...

Dec
13
2022

Special Year Research Seminar

Toward Classifying Reducts of the Complex Field
Chieu-Minh Tran
4:00pm|Simonyi 101 and Remote Access

We discuss some recent progress on the model-theoretic problem of classifying the reducts of the complex field (with named parameters and up to interdefinability). The tools we use include Castle’s recent solution of the Restricted Trichotomy...

Dec
13
2022

Special Year Research Seminar

Exponential Mixing and Fractal Uncertainty
Osama Khalil
2:00pm|Simonyi 101 and Remote Access

The Bowen-Ruelle conjecture predicts that geodesic flows on negatively curved manifolds are exponentially mixing with respect to all their equilibrium states. In a breakthrough in '98, Dolgopyat pioneered a method rooted in the thermodynamic...

Dec
13
2022

Computer Science/Discrete Mathematics Seminar II

A Characterization of Multiclass Learnability
Nataly Brukhim
10:30am|Simonyi Hall 101 and Remote Access

A seminal result in learning theory characterizes the PAC learnability of binary classes through the VC dimension. Extending this characterization to the general multiclass setting has been open since the late 1980s.

We resolve this problem by...

Dec
12
2022

Members' Colloquium

Varieties of Markoff Type: Arithmetic, Combinatorics, Dynamics
2:00pm|Simonyi Hall 101 and Remote Access - see Zoom link below

The Markoff equation $x^2+y^2+z^2=3xyz$, which arose in his spectacular thesis (1879), is ubiquitous in a tremendous variety of contexts. After reviewing some of these, we will discuss (briefly) asymptotics of integer points, and (in some detail)...

Dec
12
2022

Computer Science/Discrete Mathematics Seminar I

Optimization-Friendly Generic Mechanisms Without Money
11:15am|Simonyi 101 and Remote Access

Our goal is to develop a generic framework for converting modern gradient-descent based optimization algorithms into mechanisms where inputs come from self-interested agents.

We focus on aggregating preferences from n players in a context without...

Dec
09
2022

Group Theory/Dynamics Talk

How Small Can a Group or a Graph be to Admit a Non-Trivial Poisson Boundary?
1:30pm|Simonyi Hall 101 and Remote Access

We review results about random walks on groups, discussing results and conjectures relating critical constant for recurrence/transience, growth and Poisson boundary.

Much less is known about behavior of random walks on Schreier graphs. Since any...