# Seminars & Events for 2016-2017

September 28, 2016
4:30pm - 5:30pm
##### Weyl law for the volume spectrum
###### Department Colloquium

We will present our proof that the volume spectrum of a Riemannian manifold satisfies a Weyl law. This was a  conjecture of Gromov. The talk is based on  joint work with Liokumovich and Neves.

Speaker: Fernando Codá Marques, Princeton University
Location:
Fine Hall 314
September 29, 2016
12:30pm - 1:30pm
##### Ergodic theory and negative curvature

Ergodic theory is a very robust method to understand/distinguish dynamical systems. To a Riemannian manifold (M,g) we can associate a canonical dynamical system, its geodesic flow. During this talk we will discuss the ergodic theory of geodesic flow on negatively curved manifolds.

Speaker: Anibal Velozo , Princeton University
Location:
Fine Hall 110
September 29, 2016
2:00pm - 3:30pm
##### A modification of the moment method and stochastically evolving partitions at the edge
###### Ergodic Theory & Statistical Mechanics

This talk is about a modification of the moment method applied to extract limiting distributions of the first, second, and so on rows of randomly evolving partitions.

Speaker: in-Jee Jeong , Princeton University
Location:
September 29, 2016
3:00pm - 4:30pm
##### Symmetric intersecting families
###### Discrete Mathematics Seminar

A family of sets is said to be intersecting if any two sets in the family have nonempty intersection. Families of sets subject to various intersection conditions have been studied over the last fifty years and a common feature of many of the results in the area is that the extremal families are often quite asymmetric.

Speaker: Bhargav Narayanan , Cambridge University
Location:
Fine Hall 224
September 29, 2016
3:00pm - 4:00pm
##### Spanier-Whitehead $K$-duality
###### Algebraic Topology Seminar

Classical Spanier-Whitehead duality was introduced for the stable homotopy category of finite CW complexes. We consider a noncommutative version, termed Spanier-Whitehead $K$-duality, which is defined on the category of $C^*$-algebras whose $K$-theory is finitely generated and that satisfy the UCT, with morphisms the Kasparov $KK$-groups.

Speaker: Claude Schochet, Technion University
Location:
Fine Hall 322
September 29, 2016
4:30pm - 5:30pm
##### Asymptotic behavior of supercuspidal representations and Sato-Tate equidistribution for families
###### Princeton University/IAS Number Theory Seminar

We establish properties of families of automorphic representations as we vary prescribed supercuspidal representations at a given finite set of primes. For the tame supercuspidals, we prove the limit multiplicity property with error terms. Thereby we obtain a Sato-Tate equidistribution for the Hecke eigenvalues.

Speaker: Ju-Lee Kim , MIT
Location:
IAS Room S-101
October 3, 2016
3:00pm - 4:30pm
##### Global Existence, Blowup and Scattering for large data Supercritical and other wave equations
###### Analysis Seminar

PLEASE NOTE NEW START TIME OF 3:00.   I present a new approach to classify the asymptotic behavior of certain classes of wave equations, supercritical and others, with large initial data. In some cases, as for Nirenberg type equations, a fairly complete classification of the solutions (finite time blowup or global existence and scattering) is proved.

Speaker: Avy Soffer , Rutgers University
Location:
Fine Hall 314
October 3, 2016
4:00pm - 5:00pm
##### Network clustering with higher order structures
###### PACM/Applied Mathematics Colloquium

Spectral clustering is a well-known way to partition a graph or network into clusters or communities with provable guarantees on the quality of the clusters. This guarantee is known as the Cheeger inequality and it holds for undirected graphs. We'll discuss a new generalization of the Cheeger inequality to higher-order structures in networks including network motifs.

Speaker: David Gleich, Purdue University
Location:
Fine Hall 214
October 4, 2016
1:30pm - 2:30pm
##### Packaging the construction of Kuranishi structure on the moduli space of pseudo-holomorphic curve
###### Joint PU/IAS Symplectic Geometry Seminar

This is a part of my joint work with Oh-Ohta-Ono and is a part of project to rewrite the whole story of virtual fundamental chain in a way easier to use. In general we can construct virtual fundamental chain on (basically all) the moduli space of pseudo-holomorphic curve. It depends on the choices.

Speaker: Kenji Fukaya , Stony Brook University
Location:
IAS Room S-101
October 4, 2016
3:00pm - 4:00pm
##### Projective Dehn twist via Lagrangian cobordism
###### Joint PU/IAS Symplectic Geometry Seminar

In this talk, I would like to explain my joint work with Weiwei Wu about understanding projective Dehn twist using Lagrangian cobordism.

Speaker: Cheuk Yu Mak , IAS
Location:
IAS Room S-101
October 4, 2016
4:30pm - 5:30pm
##### Elliptic Calabi-Yau 3-folds, Jacobi forms, and derived categories
###### Algebraic Geometry Seminar

By physical considerations, Huang, Katz and Klemm conjectured in 2015 that topological string partition functions for elliptic Calabi-Yau 3-folds are governed by certain Jacobi forms. This gives strong structure results for curve counting invariants of elliptic CY 3-folds. I will explain a mathematical approach to prove (part of) the HKK Conjecture.

Speaker: Junliang Shen, ETH Zurich
Location:
Fine Hall 322
October 5, 2016
2:00pm - 3:00pm
##### Mean field evolution of fermonic systems
###### Mathematical Physics Seminar

Please note different day (Wednesday), time and location (Jadwin 303).   In this talk I will discuss the dynamics of interacting fermionic systems in the mean field regime. Compared to the bosonic case, fermionic mean field scaling is naturally coupled with a semiclassical scaling, making the analysis more involved.

Speaker: Marcello Porta, Zurich University
Location:
October 5, 2016
3:00pm - 4:00pm
##### Fill-ins, extensions, scalar curvature, and quasilocal mass
###### Differential Geometry & Geometric Analysis Seminar

There is a special relationship between the Jacobi operator and the ambient scalar curvature operator, which we'll exploit. First, I'll talk about a "cut-and-fill" technique that simplifies 3-manifolds of nonnegative scalar curvature.

Speaker: Christos Mantoulidis, Stanford University
Location:
Fine Hall 314
October 6, 2016
12:30pm - 1:30pm
##### Lefschetz Pencils

We will discuss Lefschetz pencils and will prove Lefschetz's theorem on hyperplane sections (without using transcendental methods), which will give us a more or less full understanding of the (co)homology of nonsingular complex algebraic varieties up to the middle dimension.

Speaker: Jack Sempliner , Princeton University
Location:
Fine Hall 110
October 6, 2016
2:00pm - 3:30pm
##### Supersymmetric approach in the random matrix theory
###### Ergodic Theory & Statistical Mechanics

In this talk I will give a brief outline of the Grassmann integration technique (which is also called the supersymmetry approach) and its application to the rigorous study of main spectral characteristics of random matrices.

Speaker: Tetiana Shcherbyna , Princeton University
Location:
October 6, 2016
2:30pm - 3:30pm
##### From Integrability to Medical Imaging and to the Asymtotics of the Riemann Zeta Function
###### PACM IDeAS

It is often realized that this technique can actually be used for the solution of a plethora of other problems,and thus it becomes a mathematical method.In this lecture, a review will be presented of how a concrete problem in the area of integrability led to the development of a new method in mathematical physics for analyzing boundary value problems for linear and for integrable nonlinear PDEs

Speaker: Thanasis Fokas, University of Cambridge
Location:
Fine Hall 224
October 6, 2016
3:00pm - 4:30pm
##### Complexity-separating graph classes for vertex, edge and total colouring
###### Discrete Mathematics Seminar

Given a class A of graphs and a decision problem X belonging to NP, we say that a full complexity dichotomy of A was obtained if one describes a partition of A into subclasses such that X is classified as polynomial or NP-complete when restricted to each subclass.

Speaker: Celina de Figueiredo, Rio de Janeiro
Location:
Fine Hall 224
October 6, 2016
4:30pm - 5:30pm
##### Conway mutation and knot Floer homology
###### Topology Seminar

Mutant knots are notoriously hard to distinguish. Many, but not all, knot invariants take the same value on mutant pairs. Khovanov homology with coefficients in Z/2Z is known to be mutation-invariant, while the bigraded knot Floer homology groups can distinguish mutants such as the famous Kinoshita-Terasaka and Conway pair.

Speaker: Peter Lambert-Cole , Indiana University
Location:
Fine Hall 314
October 6, 2016
4:30pm - 5:30pm
##### The Unpolarized Shafarevich Conjecture for K3 Surfaces
###### Princeton University/IAS Number Theory Seminar

Shafarevich made the following conjecture for higher genus curves: the set of isomorphism classes of genus g curves over K (a number field) with good reduction outside S (a fixed finite set of primes) is finite.  Faltings proved this and the analogous conjecture for abelian varieties of given degree. Zarhin proved this finiteness across all degrees.

Speaker: Yiwei She , Columbia University
Location:
Fine Hall 214
October 6, 2016
4:30pm - 6:00pm
##### Generated Jacobian equations and regularity: optimal transport, geometric optics, and beyond
###### Differential Geometry & Geometric Analysis Seminar

PLEASE NOTE SPECIAL DAY, TIME AND LOCATION.  Equations of Monge-Amp{\`e}re type arise in numerous contexts, and solutions often exhibit very subtle properties; due to the highly nonlinear nature of the equation, and its degenerate ellipticity.

Speaker: Jun Kitagawa, Michigan State University
Location:
Fine Hall 1001