# Seminars & Events for 2016-2017

December 14, 2016
3:00pm - 4:00pm
##### A Minkowski inequality for hypersurfaces in the Anti-deSitter-Schwarzschild manifold
###### Differential Geometry & Geometric Analysis Seminar

We prove a sharp inequality for hypersurfaces in the Anti-deSitter-Schwarzschild manifold. This inequality generalizes the classical Minkowski inequality for surfaces in the three dimensional Euclidean space, and has a natural interpretation in terms of the Penrose inequality for collapsing null shells of dust.

Speaker: Pei-Ken Hung , Columbia University
Location:
Fine Hall 314
December 14, 2016
4:30pm - 5:30pm
##### Subexponential growth, measure rigidity, strong property (T) and Zimmer's conjecture
###### Department Colloquium

Lattices in higher rank simple Lie groups, like SL(n,R) for n>2, are known to be extremely rigid.  Examples of this are Margulis' superrigidity theorem, which shows they have very few linear represenations, and Margulis' arithmeticity theorem, which shows they are all constructed via number theory.  Motivated by these and other results, in 1983 Zimmer made a number of conjectures about actio

Speaker: David Fisher , Indiana University
Location:
Fine Hall 314
December 15, 2016
11:00am - 12:15pm
##### Possible lattice distortions in the Hubbard model for graphene
###### Ergodic Theory & Statistical Mechanics

Please note special time and location.

Speaker: Rupert Frank, California Institute of Technology
Location:
Fine Hall 1201
December 15, 2016
12:30pm - 1:30pm
##### Lagrangian analyticity in fluid mechanics
###### Graduate Student Seminar

The incompressible Euler equations imply that the Lagrangian trajectories of individual water particles are automatically analytic in time, as long as the velocity field is slightly better than differentiable in the space variables. We'll discuss some of the mechanisms in different fluid models that allow for this property, and some that break it.

Speaker: Matt Hernandez , Princeton University
Location:
Fine Hall 110
December 15, 2016
2:00pm - 3:30pm
##### Families of mild mixing interval exchange transformations
###### Ergodic Theory & Statistical Mechanics

Almost every interval exchange transformation is rigid. In this talk I will describe recent work showing that for an infinite class of permutations the set of mild mixing interval exchange transformations has full Hausdorff dimension.

Speaker: Donald Robertson, University of Utah
Location:
December 15, 2016
3:00pm - 4:30pm
##### Independent sets, local algorithms and random regular graphs
###### Discrete Mathematics Seminar

An ''ndependent set'' in a graph is a set of vertices that have no edges between them. How large can an independent set be in a random d-regular graph? How large can it be if we are to construct it using a (possibly randomized) algorithm that is local in nature? I will discuss a notion of local algorithms for combinatorial optimization problems on large, random d-regular graphs.

Speaker: Mustazee Rahman , MIT
Location:
Fine Hall 224
December 15, 2016
4:30pm - 5:30pm
##### SPECIAL LECTURE: Results Related to the CR Yamabe Problem
###### Differential Geometry & Geometric Analysis Seminar

This is a special lecture in Geometric Analysis.  Please note different day, time and location.  I will talk about the CR Yamabe problem and its related results, including the CR Yamabe flow, uniqueness and compactness of the CR Yamabe problem.

Speaker: Pak Tung Ho, Sogang University
Location:
Fine Hall 1001
December 15, 2016
4:30pm - 5:30pm
##### TBA - Tolga Etgü
###### Topology Seminar
Speaker: Tolga Etgü , Koç University / Princeton University
Location:
Fine Hall 314
December 15, 2016
4:30pm - 5:30pm
##### On the spectrum of Faltings' height
###### Princeton University/IAS Number Theory Seminar

The arithmetic complexity of an elliptic curve defined over a number field is naturally quantified by the (stable) Faltings height. Faltings' spectrum is the set of all possible Faltings' heights. The corresponding spectrum for the Weil height on a projective space and the Neron-Tate height of an Abelian variety is dense on a semi-infinite interval.

Speaker: Juan Rivera-Letelier, University of Rochester
Location:
Fine Hall 214
December 15, 2016
4:30pm - 5:30pm
##### The Zakharov-Lvov stochastic model for the wave turbulence
###### Analysis of Fluids and Related Topics

I will discuss the stochastic model of wave turbulence, suggested in 70's by Zakharov-Lvov and present some rigorous results, concerning this theory. Next I will explain the heuristic derivation of the wave kinetic equation for the model and finally present the plan of a rigorous justification of the kinetic equation in a work under preparation with Galina Perelman.

Speaker: Sergei Kuksin , Universite Paris-Diderot
Location:
Fine Hall 322
February 2, 2017
10:45am - 11:45am
##### Relative quantum product and open WDVV equations
###### Joint PU/IAS Symplectic Geometry Seminar

The standard WDVV equations are PDEs in the potential function that generates Gromov-Witten invariants. These equations imply relations on the invariants, and sometimes allow computations thereof, as demonstrated by Kontsevich-Manin (1994). We prove analogous equations for open Gromov-Witten invariants that we defined in a previous work.

Speaker: Sara Tukachinsky , Montreal
Location:
IAS Room S-101
February 2, 2017
4:30pm - 5:30pm
##### Superconnections and special cycles
###### Princeton University/IAS Number Theory Seminar

I will start by explaining Quillen's notion of a superconnection, and then will use it to define some natural

Speaker: Luis Garcia , University of Toronto
Location:
Fine Hall 214
February 6, 2017
3:00pm - 4:30pm
##### The Kakeya needle problem for rectifiable sets
###### Analysis Seminar

We show that the classical results about rotating a line segment in arbitrarily small area, and the existence of a Besicovitch and a Nikodym set hold if we replace the line segment by an arbitrary rectifiable set.  This is a joint work with Alan Chang.

Speaker: Marianna Csörnyei , University of Chicago
Location:
Fine Hall 314
February 7, 2017
4:30pm - 5:30pm
##### Theta functions for affine log CY varieties
###### Algebraic Geometry Seminar

Gross, Hacking, Siebert and I conjecture that the vector space of regular functions on an affine log CY (with maximal boundary) comes with a canonical basis, generalizing the monomial basis on a torus, in which the structure constants for the multiplication rule are given by counts of rational curves on the mirror.

Speaker: Sean Keel , University of Texas at Austin
Location:
Fine Hall 322
February 8, 2017
2:30pm - 3:30pm
##### Nonconvex Recovery of Low-Complexity Models
###### PACM IDeAS

Nonconvex optimization plays important role in wide range of areas of science and engineering — from learning feature representations for visual classification, to reconstructing images in biology, medicine and astronomy, to disentangling spikes from multiple neurons. The worst case theory for nonconvex optimization is dismal: in general, even guaranteeing a local minimum is NP hard.

Speaker: John Wright, Columbia University
Location:
Fine Hall 224
February 8, 2017
3:00pm - 4:00pm
##### Random walk on free solvable groups
###### Probability Seminar

The study of free solvable groups has been advocated and pursued by Anatoly Vershik and others with various perspectives in mind. I will discuss random walks on free finitely generated solvable groups in the general context of geometric group theory and with an emphasize on exploring what algebraic properties are reflected in the behavior of various random walk.

Speaker: Laurent Saloff-Coste, Cornell University
Location:
Fine Hall 214
February 8, 2017
3:00pm - 4:00pm
##### Optimal regularity of three dimensional mass minimizing cones
###### Differential Geometry & Geometric Analysis Seminar

In this talk I will present the following regularity results in minimal surface theory: the singular points of a mass minimizing three dimensional cone in the Euclidean space are contained in at most finitely many half lines (joint with C. De Lellis and L. Spolaor).

Speaker: Emanuele Spadaro, University of Leipzig
Location:
Fine Hall 314
February 8, 2017
4:30pm - 5:30pm
##### Classical and quantum geometric Langlands via quantization in positive characteristic
###### Department Colloquium

Geometric Langlands is an algebro-geometric and categorified analog of the Langlands program, introduced by A.Beilinson and V.Drinfeld. It can be understood as a certain non-commutative Fourier-Mukai transform between two moduli spaces associated to an algebraic curve and a Langlands dual pair of algebraic groups.

Speaker: Roman Travkin , IAS
Location:
Fine Hall 314
February 9, 2017
10:45am - 11:45am
##### Gromov-Witten theory of locally conformally symplectic manifolds and the Fuller index
###### Joint PU/IAS Symplectic Geometry Seminar

We review the classical Fuller index which is a certain rational invariant count of closed orbits of a smooth vector field, and then explain how in the case of a Reeb vector field on a contact manifold $C$, this index can be equated to a Gromov-Witten invariant counting holomorphic tori in the locally conformally symplectic manifold $C \times S^1$.

Speaker: Yakov Savelyev , University of Colima, Mexico
Location:
IAS Room S-101
February 9, 2017
12:30pm - 1:30pm
##### Remarkable identities in the counting functions for cubic and quartic rings
###### Graduate Student Seminar

Let h(D) be the number of cubic rings having discriminant D, and let h'(D) be the number of cubic rings having discriminant -27D where the traces of all elements are divisible by 3. (In each case, weight rings by the reciprocal of their number of automorphisms.) At first glance, there is no relation between these two quantities, nor was there expected to be until in 1997, Y.

Speaker: Evan O'Dorney , Princeton University
Location:
Fine Hall 110