Previous Conferences & Workshops

Sep
23
2025

Joint IAS/PU Symplectic Geometry Seminar

Dynamic and Topological Aspects of Hamiltonian Floer Theory on Surfaces
Dustin Connery-Grigg
1:00pm|Fine Hall 401

Given a Hamiltonian $H \in C^\infty(S^1 \times M)$, what is
the relationship between the dynamics of the isotopy generated by $H$
and the various Floer-theoretic invariants associated to $H$? In this
talk I will discuss how — in the case where $M$ is a...

Sep
23
2025

Computer Science/Discrete Mathematics Seminar II

Simulating Time With Square-Root Space (And With Details)
10:30am|Rubenstein Commons | Meeting Room 5

We will go in-depth into the proof that for all functions $t(n) \geq n$, every multitape Turing machine running in time $t$ can be simulated in space only $O(\sqrt{t \log t})$. We will attempt to be completely self-contained. To that end, we will...

Sep
22
2025

Joint IAS/PU Arithmetic Geometry

de Rham Cohomology of Holonomic D-modules
3:30pm|Princeton University, Fine 224

The talk will be devoted to the problem of finiteness of the de Rham cohomology of holonomic D-modules, with the emphasis on the nonarchimedean setting. First, I will briefly recall what holonomic D-modules are and why they are important. Next, I...

Sep
22
2025

Members' Colloquium

Unlikely Intersections and Connections to Geometry
1:30pm|Wolfensohn Hall and Remote Access

The field of unlikely Intersections presents a robust paradigm for problems in which several subjects intermingle: arithmetic, o-minimality, and hodge theory. The goal of this talk will be to introduce some of those connections. My aim is to...

Sep
22
2025

Computer Science/Discrete Mathematics Seminar I

Balancing Extensions in Posets of Large Width
Maxwell Aires
11:00am|Rubenstein Commons | Meeting Room 5

Abstract: A linear extension of $P$ is a linear ordering compatible with the poset relations. Let $p(x< y), p(y < x))$ and $\delta(P)$ be the maximum value of $\delta(x, y)$ over all $x, y$ in $P$. The following two conjectures about $\delta(P)$ are both well-known:

  1. (The "1/3-2/3 Conjecture") $\delta(P) \geq \frac{1}{3}$ whenever $P$ is not a chain.
  2. (The "Kahn-Saks Conjecture") $\delta(P) \to \frac{1}{2}$ as $w(P) \to \infty$ (where $w(P)$ is the maximum size of an antichain in $P$).

While still far from either of these, we prove a number of conditions for $\delta(P) \to \frac{1}{2}$ and $\delta(P) \geq \frac{1}{e} - o(1)$, using a mix of geometric and probabilistic techniques. Joint with Jeff Kahn.

Sep
18
2025

Joint PU/IAS Number Theory

A P-Adic Extension Theorem for Shimura Varieties and Period Images
3:30pm|Fine 110, Princeton University

Borel proved that every holomorphic map from a product of punctured unit discs to a complex Shimura variety extends to a map from a product of discs to its Bailey-Borel compactification. In joint work with Oswal, Zhu, and Patel, we proved a p-adic...

Sep
16
2025

Joint IAS/PU Groups and Dynamics Seminar

Orthogonality of Sequences, Characteristic Classes in Ergodic Theory and the Local Fourier Uniformity Problem for Small Sets
Mariusz Lemanczyk
4:30pm|314 Fine Hall

Given a bounded sequence of zero mean, we study the problem of its orthogonality to all continuous  observables in topological dynamical systems whose all invariant measures yield measure-theoretic systems belonging to a fixed characteristic class...