Previous Conferences & Workshops

Jan
23
2023

Joint IAS/PU Arithmetic Geometry Seminar

Dual Abelian Varieties Over a Local Field Have Equal Volumes
4:30pm|Princeton University, Fine Hall 314

A top degree differential form \omega on a smooth algebraic variety X over a local field K gives rise to a (real valued) measure on X(K). The Serre duality yields a natural isomorphism between 1-dimensional spaces of global top degree forms on an...

Jan
23
2023

Computer Science/Discrete Mathematics Seminar I

Non-measurability of the inverse theorem for the Gowers norms
11:15am|Simonyi 101 and Remote Access

Over a high-dimensional vector space $F_p^n $over a fixed finite field $F_p$, the inverse theorem for the Gowers norm asserts that a bounded function f on this space that has a large Gowers $U^{k+1}$ norm, must necessarily correlate with a phase...

Jan
20
2023

Special Year Informal Seminar

Dynamical Degrees of Endomorphisms of Affine Surfaces
Marc Abboud
1:30pm|Simonyi 101

Let $f: \mathbf C^2 \rightarrow \mathbf \C^2$ be a polynomial transformation. The dynamical degree of $f$ is defined as $\lim_n (\text{deg} f^n)^{1/n}$, where $\text{deg} f^n$ is the degree of the $n$-th iterate of $f$. In 2007, Favre and Jonsson...

Jan
20
2023

Probability Seminar

Langevin Dynamics of Yang-Mills in 2D and 3D
Hao Shen
11:15am|Simonyi 101 and Remote Access

We will discuss stochastic quantization i.e. Langevin dynamic of the Yang-Mills model on two and three dimensional torus. This is described by a Lie algebra valued stochastic PDE driven by space-time white noise. We construct $(local)$ solution to...

Jan
20
2023

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

Arnold Conjecture Over Integers
Shaoyun Bai
9:15am|Remote Access

We show that for any closed symlectic manifold, the number of 1-periodic orbits of any non-degenerate Hamiltonian is bounded from below by a version of total Betti number over Z, which takes account of torsions of all characteristics. The proof...

Jan
18
2023

Analysis and Mathematical Physics

Regularity of Vortex and SQG Patches
3:00pm|Simonyi Hall 101 and Remote Access

I will review some recent progress on regularity properties of vortex and SQG patches. In particular, I will present an example of a vortex patch with continuous initial curvature that immediately becomes infinite but returns to $(C^2)$ class at all...

Jan
18
2023

Special Year Learning Seminar

Bounds in the Inverse Theorem for the Gowers Norms (for Certain Groups)
10:30am|Simonyi 101 and Remote Access

The inverse theorem for the Gowers U^{s+1}-norms has a central place in modern additive combinatorics, but all known proofs of it are difficult and most do not give effective bounds.

Over this seminar and the next, I will give an outline of a proof...

Jan
17
2023

Special Year Research Seminar

On Furstenberg Systems for Some Aperiodic Multiplicative Functions
2:00pm|Simonyi 101 and Remote Access

The Chowla conjecture from 1965 predicts that all autocorrelations of the Liouville function vanish. In fact, after an adaptation, the Chowla conjecture was expected to hold for all aperiodic multiplicative functions with values in the unit disc (cf...