Previous Conferences & Workshops

Apr
30
2020

Joint IAS/Princeton University Number Theory Seminar

Eulerianity of Fourier coefficients of automorphic forms
Henrik Gustafsson
4:30pm|https://theias.zoom.us/j/959183254

The factorization of Fourier coefficients of automorphic forms plays an important role in a wide range of topics, from the study of L-functions to the interpretation of scattering amplitudes in string theory. In this talk I will present a transfer...

Apr
30
2020

Theoretical Machine Learning Seminar

Latent Stochastic Differential Equations for Irregularly-Sampled Time Series
David Duvenaud
3:00pm|Remote Access Only - see link below

Much real-world data is sampled at irregular intervals, but most time series models require regularly-sampled data. Continuous-time models address this problem, but until now only deterministic (ODE) models or linear-Gaussian models were efficiently...

Apr
29
2020

Mathematical Conversations

Musings about a 10-year collaboration with biological morphologists, or how to make biologists comfortable with fiber bundles.
5:30pm|Remote Access Only

In the course of this collaboration, both sides learned about the other field; to my surprise, the biologists learned to "speak" some mathematics. Also, when they saw how we approached answering their initial questions, the questions changed. And...

Apr
28
2020

Analysis Seminar

Ellipses of small eccentricity are determined by their Dirichlet (or, Neumann) spectra
Steven Morris Zelditch
11:00am|https://theias.zoom.us/j/562592856

In 1965, M. Kac proved that discs were uniquely determined by their Dirichlet (or, Neumann) spectra. Until recently, disks were the only smooth plane domains known to be determined by their eigenvalues. Recently, H. Hezari and I proved that ellipses...

Apr
28
2020

Computer Science/Discrete Mathematics Seminar II

A Framework for Quadratic Form Maximization over Convex Sets
10:30am|https://theias.zoom.us/j/360043913

We investigate the approximability of the following optimization problem, whose input is an
n-by-n matrix A and an origin symmetric convex set C that is given by a membership oracle:
"Maximize the quadratic form as x ranges over C."

This is a rich...

Apr
27
2020

Computer Science/Discrete Mathematics Seminar I

Graph and Hypergraph Sparsification
Luca Trevisan and Kobbi Nissim
11:00am|https://theias.zoom.us/j/360043913

 

A weighted graph H is a sparsifier of a graph G if H has much fewer edges than G and, in an appropriate technical sense, H "approximates" G. Sparsifiers are useful as compressed representations of graphs and to speed up certain graph algorithms...

Apr
24
2020

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

The Geography of Immersed Lagrangian Fillings of Legendrian Submanifolds
9:00am|https://princeton.zoom.us/j/745635914

Given a smooth knot K in the 3-sphere, a classic question in knot theory is: What surfaces in the 4-ball have boundary equal to K? One can also consider immersed surfaces and ask a “geography” question: What combinations of genus and double points...

Apr
23
2020

Theoretical Machine Learning Seminar

Deep Generative models and Inverse Problems
Alexandros Dimakis
3:00pm|https://theias.zoom.us/j/384099138

Modern deep generative models like GANs, VAEs and invertible flows are showing amazing results on modeling high-dimensional distributions, especially for images. We will show how they can be used to solve inverse problems by generalizing compressed...

Apr
23
2020

Joint IAS/Princeton University Number Theory Seminar

Symmetric power functoriality for holomorphic modular forms
Jack Thorne
9:00am|https://theias.zoom.us/j/959183254

Langlands’s functoriality conjectures predict the existence of “liftings” of automorphic representations along morphisms of L-groups. A basic case of interest comes from the irreducible algebraic representations of GL(2), thought of as the L-group...

Apr
22
2020

Mathematical Conversations

Sullivan's Clock: Dennis Sullivan's counter-example to the periodic orbit conjecture
5:30pm|Remote Access Only

In 1976 Dennis Sullivan gave an example of a smooth vector-field on a compact (Riemannian) 5-dimensional manifold in which all the orbits are closed but for which there is no upper bound to the length of a closed orbit. (At first this doesn't even...