Previous Conferences & Workshops

Feb
25
2022

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

Topological entropy of Hamiltonian diffeomorphisms: a persistence homology and Floer theory perspective
Erman Cineli
9:15am|Remote Access

In this talk I will introduce barcode entropy and discuss its connections to topological entropy. The barcode entropy is a Floer-theoretic invariant of a compactly supported Hamiltonian diffeomorphism, measuring, roughly speaking, the exponential...

Feb
23
2022

Mathematical Conversations

Lego in finite groups, Hurwitz spaces, and Markoff triples
William Yun Chen
6:00pm|Birch Garden, Simons Hall

Let G be a group, and let (g,h) be a pair in G x G. Consider the group of symmetries of G x G generated by the "moves" sending (g,h) to (g,gh), (g,g^{-1}h), (g,hg), (g,hg^{-1}), (gh,h),...etc. An old question from the 50's, motivated by the study of...

Feb
23
2022

Mathematical Physics Seminar

Log-Sobolev inequality for near critical Ising and continuum $\varphi^4$ measures
Roland Bauerschmidt
4:30pm|Simonyi Hall 101 and Remote Access

I will present results on Glauber dynamics of Ising models and continuum
$\varphi^4$ measures.

For ferromagnetic Ising models, we show that the log-Sobolev constant satisfies a simple bound expressed only in terms of the susceptibility of the model...

Feb
23
2022

Topics in Geometry

Quantitative Heegaard Floer cohomology and the Calabi invariant [CGHMSS] Part III: Background on Heegaard-Floer
Ipsita Datta
2:00pm|Simonyi Hall 101 and Remote Access
Feb
23
2022

Arithmetic Groups

Effective equidistribution of some one-parameter unipotent flows with polynomial rates I & II
Elon Lindenstrauss
11:00am|Simonyi 101 and Remote Access

A landmark result of Ratner states that if $G$ is a Lie group, $\Gamma$ a lattice in $G$ and if $u_t$ is a one-parameter $Ad$-unipotent subgroup of $G$, then for any $x \in G/\Gamma$ the orbit $u_t.x$ is equidistributed in a periodic orbit of some...

Feb
22
2022

Seminar in Analysis and Geometry

On the Lagrangian cobordism relation on Legendrian links
Joshua Sabloff
2:00pm|Simonyi Hall 101 and Remote Access

Lagrangian cobordism induces a preorder on the set of Legendrian links in any contact 3-manifold. We show that any finite collection of null-homologous Legendrian links in a tight contact 3-manifold with a common rotation number has an upper bound...

Feb
22
2022

Computer Science/Discrete Mathematics Seminar II

Derandomization and its connections throughout complexity theory
Liije Chen
10:30am|Simonyi Hall 101 and Remote Access

This is the second talk in a three-part series presented together with Roei Tell.

The series is intended to survey the fast-paced recent developments in the study of derandomization. We will present:

  1. A revised version of the classical hardness...