Previous Conferences & Workshops

Dec
18
2025

Joint IAS/PU Number Theory

Euler Systems in the Twisted Friedberg-Jacquet Setting
Shilin Lai
3:30pm|Simonyi 101 and Remote Access

We construct the tame part of a split anticyclotomic Euler system in a setting where local multiplicity one does not hold. Instead of the traditional zeta integral approach, we prove the existence of the necessary test vectors using a new method...

Dec
17
2025

What is...?

What is String Topology?
12:45pm|Simonyi 101 and Remote Access

Given two families of loops on a closed smooth manifold, one can concatenate the loops at the intersections points of these families to obtain a new family of loops. This is the Chas–Sullivan product on the homology of the free loop space of a...

Dec
17
2025

Special Groups and Dynamics Seminar

Asymptotic dimension, Isoperimetric Problem, and Traveling Salesman Problem in Groups
10:30am|Simonyi 101 and Remote Access

In many groups, the optimal diameter for the solutions of the isoperimetric problem is asymptotically equivalent to the lower bound coming from their cardinality; in this situation one says that the Følner function is lossless with respect to the...

Dec
16
2025

Joint IAS/PU Groups and Dynamics Seminar

Partially Hyperbolic Actions of Semisimple Lie Groups
Kurt Vinhage
4:30pm|Simonyi 101

Zimmer proposed the study of higher-rank semisimple group actions in the 1980's after showing certain rigidity results, especially about associated cocycles in the measurable category. In this talk, I will describe recent progress towards...

Dec
16
2025

Joint IAS/PU Symplectic Geometry Seminar

Cohomologous Symplectic Forms with Different Gromov Widths
Shengzhen Ning
1:00pm|Simonyi 101 and Remote Access

For closed symplectic manifolds, the Gromov width is among the most fundamental symplectic capacities: it measures the size of the largest embedded symplectic ball and is sensitive to the perturbation of the symplectic forms. A natural question...

Dec
15
2025

Joint IAS/PU Arithmetic Geometry

Affine Schubert Varieties Are Splinters
Robert Cass
3:30pm|Simonyi 101 and Remote Access

Schubert varieties are known to be Frobenius split in positive characteristic by the work of Mehta and Ramanathan. More recently, Bhatt showed that the full flag variety for $GL_n$ is a splinter by entirely different methods. In this talk, we will...

Dec
15
2025

Members' Colloquium

Fundamental Groups of Algebraic Varieties and the Shafarevich Conjecture
1:30pm|Simonyi 101 and Remote Access

The fundamental group $\pi_1(X)$ is an important invariant of a complex algebraic variety X.  Despite its topological nature, it is closely connected to the geometry of many algebraic structures on X.  In this talk I want to discuss two elementary...

Dec
12
2025

Special Seminar

Wild Hurwitz Moduli Spaces and Level Structures
2:30pm|Simonyi Classroom 114

Hurwitz moduli spaces of covers of curves of degree d are classical and well studied objects if one assumes that d! is invertible and hence no wild ramification phenomena occur. There were very few attempts to study the wild case. In the most...

Dec
12
2025

IAS/Princeton/Montreal/Paris/Tel-Aviv Symplectic Geometry Zoominar

Generalized Convex Toric Domains and Symplectic Embedding Problems
Nicki Magill
9:15am|Remote Access

A convex toric domain $X_\Omega$ is a 4-dimensional subset of $\mathbb{R}^4$, defined as the preimage of a bounded convex region $\Omega$ in the positive quadrant of $\mathbb{R}^2$ under the moment map. We consider how geometric features of $\Omega$...

Dec
11
2025

Joint IAS/PU Number Theory

Simultaneous Non-Vanishing of L-Functions at the Central Point
Alexandra Florea
3:30pm|Simonyi 101 and Remote Access

In this talk, I will focus on simultaneous non-vanishing results for Dirichlet L-functions at the central point 1/2. Specifically, I will describe non-vanishing results (conditional on GRH) for two L-functions associated to Dirichlet characters in...