Previous Conferences & Workshops

Mar
14
2023

Special Year Research Seminar

Geometric Representation of Structured Extensions in Ergodic Theory
Henrik Kreidler
2:00pm|Simonyi 101 and Remote Access

The Mackey-Zimmer representation theorem is a key structural result from ergodic theory: Every compact extension between ergodic measure-preserving systems can be written as a skew-product by a homogeneous space of a compact group. This is used, e.g...

Mar
13
2023

IAS/Princeton Arithmetic Geometry Seminar

The Riemann-Hilbert Correspondence in Nonarchimedean Geometry
4:30pm|Simonyi Hall 101 and Remote Access

Let X be a smooth projective variety over the field of complex numbers. The classical Riemann-Hilbert correspondence supplies a fully faithful embedding from the category of perverse sheaves on X to the category of algebraic D_X-modules. In this...

Mar
13
2023

Joint IAS/Princeton University Symplectic Geometry Seminar

Mean Action and the Calabi Invariant
Abror Pirnapasov
4:00pm|Fine 314 and Remote Access

Hutchings used Embedded Contact Homology to show the following for area-preserving disc diffeomorphisms that are a rotation near the boundary of the disc: if the asymptotic mean action on the boundary is greater than the Calabi invariant, then the...

Mar
13
2023

Members' Colloquium

Almost all Collatz Orbits Attain Almost Bounded Values
2:00pm|Simonyi Hall 101 and Remote Access - see Zoom link below

Define the Collatz map Col on the natural numbers by setting Col(n) to equal 3n+1 when n is odd and n/2 when n is even. The notorious Collatz conjecture asserts that all orbits of this map eventually attain the value 1. This remains open, even if...

Mar
13
2023

Computer Science/Discrete Mathematics Seminar I

Why Can’t We Classically Describe Quantum Systems?
Chinmay Nirkhe
11:15am|Simonyi 101 and Remote Access

A central goal of physics is to understand the low-energy solutions of quantum interactions between particles. This talk will focus on the complexity of describing low-energy solutions; I will show that we can construct quantum systems for which the...

Mar
10
2023

Special Year Informal Seminar

A Non-flag Arithmetic Regularity Lemma and Counting Lemma
Daniel Altman
1:30pm|Simonyi 101

We will discuss a version of the Green--Tao arithmetic regularity lemma and counting lemma which works in the generality of all linear forms. In this talk we will focus on the qualitative and algebraic aspects of the result.

Mar
10
2023

Probability Seminar

Conformal blocks of Liouville conformal field theory
Colin Guillarmou and Rémi Rhodes
10:15am|Simonyi 101 and Remote Access

Liouville conformal field theory is a CFT with central charge c>25 and continuous spectrum, its correlation functions on Riemann surfaces with marked points can be expressed using the bootstrap method in terms of conformal blocks. We will explain...

Mar
09
2023

Joint IAS/PU Number Theory Seminar

Structure and Randomness in the Pro-Nilpotent Tower of Number Fields
Carlo Pagano
4:30pm|Princeton University, Fine Hall 214

I will talk about a program aimed at exploiting randomness of certain "graphs of symbols" in determining the precise structure of the pro-nilpotent Galois groups of number fields, and how this has been successfully implemented in nilpotency class 2...