Previous Conferences & Workshops

Nov
11
2015

Minerva Distinguished Visitor Lectures at Princeton University

II: Dynamics on moduli spaces of hyperbolic surfaces
4:30pm|McDonnell A02, Princeton University

In the second lecture, I will discuss several natural geometric flows defined on bundles over the moduli spaces of curves. I will describe basic ergodic properties of these flows. I will discuss some open questions and some of the progress made in...

Nov
10
2015

Joint IAS/Princeton University Number Theory Seminar

On the Moy-Prasad filtration and supercuspidal representations
2:00pm

Reeder and Yu gave recently a new construction of certain supercuspidal representations of $p$-adic reductive groups (called epipelagic representations). Their construction relies on the existence of stable vectors in the first Moy-Prasad filtration...

Nov
10
2015

Computer Science/Discrete Mathematics Seminar II

Exponential separation of communication and external information
10:30am|S-101

We show an exponential gap between communication complexity and external information complexity, by analyzing a communication task suggested as a candidate by Braverman [Bra13]. Previously, only a separation of communication complexity and internal...

Nov
09
2015

Minerva Distinguished Visitor Lectures at Princeton University

I: Geometry and dynamics on hyperbolic surfaces
4:30pm|McDonnell A02, Princeton University

The first lecture will give some background on the geometry and dynamics on hyperbolic surfaces. I will give a brief overview of Teichmüller theory and properties of the mapping class groups and the space of geodesic currents. I will discuss some...

Nov
09
2015

Members’ Seminar

Hard Lefschetz theorem and Hodge-Riemann relations for combinatorial geometries
2:00pm|S-101

A conjecture of Read predicts that the coefficients of the chromatic polynomial of a graph form a log-concave sequence for any graph. A related conjecture of Welsh predicts that the number of linearly independent subsets of varying sizes form a log...

Nov
09
2015

Computer Science/Discrete Mathematics Seminar I

Cutting plane method: A faster algorithm for many (combinatorial) optimization problems
Yin Tat Lee
11:15am|S-101

Many polynomial-time solvable (combinatorial) optimization problems can be reduced to the feasibility problem and the intersection problem. In this talk, I will present the first nearly cubic time algorithm for both problems using a new cutting...

Nov
07
2015

Workshop on Topology: Identifying Order in Complex Systems

Interactive visualization of 2-D persistence modules
5:00pm|S-101

In topological data analysis, we often study data by associating to the data a filtered topological space, whose structure we can then examine using persistent homology. However, in many settings, a single filtered space is not a rich enough...

Nov
07
2015

Workshop on Topology: Identifying Order in Complex Systems

Hierarchical clustering on asymmetric networks
Facundo Mémoli
3:30pm|S-101

The problem of determining clusters in a data set admits different interpretations depending on whether the data is metric, symmetric but not necessarily metric, or asymmetric. Whereas there is a good degree of understanding of what are the natural...

Nov
07
2015

Workshop on Topology: Identifying Order in Complex Systems

Topological and combinatorial methods in Theoretical Distributed Computing
Dmitry Feichtner-Kozlov
2:00pm|S-101

In the first half of the talk I will give a very compressed introduction into parts of Theoretical Distributed Computing from the point of view of mathematician. I will describe how to construct simplicial models whose combinatorics contains...

Nov
07
2015

Workshop on Topology: Identifying Order in Complex Systems

Topological effects in metals: from chiral and gyrotropic magnetic effects to quenched Majoranas
Joel Moore
11:30am|S-101

The recent advances in our understanding of topological states of free-fermion insulators give some valuable concepts and tools for the analysis of metals. The first part of this talk focuses on low-energy electrodynamic responses of simple metals...