# Seminars & Events for 2013-2014

November 13, 2013
4:30pm - 6:00pm
##### Tales of Our Forefathers
###### Department Colloquium

This is not a mathematics talk but it is a talk for mathematicians. Too often, we think of historical mathematicians as only names assigned to theorems. With vignettes and anecdotes, I'll convince you they were also human beings and that, as the Chinese say, "May you live in interesting times" really is a curse.

Speaker: Barry Simon, Caltech
Location:
Fine Hall 314
November 14, 2013
12:30pm - 1:30pm
##### I got 3 open problems but an application ain't one

I will describe and talk about 3 open math problems related to my work. They involve number theory, algebraic geometry, and random matrices. Would love to hear your thoughts on any of them.

Speaker: Afonso Bandeira , Princeton University
Location:
Fine Hall 314
November 14, 2013
2:00pm - 3:30pm
##### Introduction to the quantum theory of experiments
###### Ergodic Theory & Statistical Mechanics
Speaker: Juerg Froehlich, ETH Zurich
Location:
Fine Hall 601
November 14, 2013
3:00pm - 4:00pm
##### Stable homology for moduli spaces of manifolds
###### Algebraic Topology Seminar

THIS IS A JOINT ALGEBRAIC TOPOLOGY / TOPOLOGY SEMINAR. There will be two separate talks: 3:00-4:00 pm (Fine 214) and 4:30-5:30 pm (Fine 314). For a compact manifold $W$, possibly with boundary, we shall let $\mathrm{Diff}(W)$ denote the topological group of diffeomorphisms of $W$ fixing a neighborhood of $\partial W$. PLEASE CLICK ON SEMINAR TITLE FOR COMPLETE ABSTRACT.

Speaker: Søren Galatius , Stanford University
Location:
Fine Hall 214
November 14, 2013
4:30pm - 6:00pm
##### Fragile matroids and excluded minors
###### Discrete Mathematics Seminar

Matroids abstract the notions of linear/geometric/algebraic dependence. More specifically, a matroid consists of a finite collection of points, and a distinguished family of dependent subsets. PLEASE CLICK ON SEMINAR TITLE FOR COMPLETE ABSTRACT.

Speaker: Dillon Mayhew, Victoria University of Wellington
Location:
Fine Hall 224
November 14, 2013
4:30pm - 5:30pm
##### Potentially Singular Solutions of the 3D Incompressible Euler Equations
###### Analysis of Fluids and Related Topics

Whether the 3D incompressible Euler equations can develop a singularity in finite time from smooth initial data is one of the most challenging problems in mathematical fluid dynamics. This work attempts to provide an affirmative answer to this long-standing open question from a numerical point of view, by presenting a class of potentially singular solutions to the Euler equations computed in axisymmetric geometries. PLEASE CLICK ON SEMINAR TITLE FOR COMPLETE ABSTRACT.

Speaker: Gou Luo , Caltech
Location:
Fine Hall 322
November 14, 2013
4:30pm - 5:30pm
##### Independence of l and local terms
###### Princeton University/IAS Number Theory Seminar

Let $k$ be an algebraically closed field and let $c:C\rightarrow X\times X$ be a correspondence. Let $\ell$ be a prime invertible in $k$ and let $K\in D^b_c(X, \overline {\mathbb{Q}}_\ell )$ be a complex. An action of $c$ on $K$ is by definition a map $u:c_1^*K\rightarrow c_2^!K$.

Speaker: Martin Olsson, University of California - Berkeley
Location:
IAS Room S-101
November 14, 2013
4:30pm - 5:30pm
##### Homological stability for moduli spaces of manifolds
###### Topology Seminar

THIS IS A JOINT TOPOLOGY / ALGEBRAIC TOPOLOGY SEMINAR. There will be two separate talks: 3:00-4:00 pm (Fine 214) and 4:30-5:30 pm (Fine 314). For a compact manifold $W$, possibly with boundary, we shall let $\mathrm{Diff}(W)$ denote the topological group of diffeomorphisms of $W$ fixing a neighborhood of $\partial W$. PLEASE CLICK ON SEMINAR TITLE FOR COMPLETE ABSTRACT.

Speaker: Søren Galatius, Stanford University
Location:
Fine Hall 314
November 15, 2013
1:30pm - 2:30pm
##### Calabi-Yau mirror symmetry: from categories to curve-counts
###### Joint PU/IAS Symplectic Geometry Seminar

I will report on joint work with Nick Sheridan concerning structural aspects of mirror symmetry for Calabi-Yau manifolds.

Speaker: Tim Perutz, University of Texas at Austin
Location:
IAS Room S-101
November 15, 2013
3:00pm - 4:00pm
##### Singularities of the L^2 curvature flow
###### Differential Geometry & Geometric Analysis Seminar

The L2 norm of the Riemannian curvature tensor is a natural energy to associate to a Riemannian manifold, especially in dimension 4. A natural path for understanding the structure of this functional and its

Speaker: Jeffry Streets, University of California-Irvine
Location:
Fine Hall 314
November 18, 2013
3:15pm - 4:15pm
##### Higher-order analogues of the exterior derivative complex
###### Analysis Seminar

I will begin by presenting earlier joint work with E. M. Stein concerning div-curl type inequalities for the exterior derivative complex and its adjoint in Euclidean space R^n.

Speaker: Loredana Lanzani , University of Arkansas
Location:
Fine Hall 314
November 18, 2013
4:30pm - 5:30pm
##### The evolution of social traits in network structured populations
###### PACM/Applied Mathematics Colloquium

Over many decades theoretical biologists have grappled with the question of how to measure the relative selective advantage of different behavioral strategies. The various approaches to this question have fallen into one of the following categories: fixation probability of a mutant allele in a wild type population, some measures of gene frequency and gene frequency change, and a formulation of a different type of fitness called the inclusive fitness.
PLEASE CLICK ON COLLOQUIUM TITLE FOR COMPLETE ABSTRACT.

Speaker: Corina Tarnita , Princeton University - EEB
Location:
Fine Hall 214
November 19, 2013
4:30pm - 5:30pm
##### Rational curves in the log category
###### Algebraic Geometry Seminar

In birational geometry, log pairs are introduced for studying open varieties and for reducing problems to lower dimensional case. In this talk, I will explain that this framework can be used to study rational curves on varieties. I will introduce A^1-connectedness for log smooth pairs, i.e., the interior admits lots of rational curves which meet the boundary once.

Speaker: Yi Zhu, University of Utah
Location:
Fine Hall 322
November 20, 2013
4:30pm - 5:30pm
##### TBA - Kiselev
###### Analysis of Fluids and Related Topics

PLEASE NOTE SPECIAL DAY (WEDNESDAY) AND LOCATION.

Speaker: Alex Kiselev , University of Wisconsin
Location:
Fine Hall 214
November 21, 2013
12:30pm - 1:30pm
##### Computations in Algebraic Geometry

This will be a fairly expository talk on the role of computation in algebraic geometry. I will discuss basics of Groebner bases and the geometry associated to them. These give an easy way to construct algorithms to solve many computational problems about projective varieties.

Speaker: Charlie Stibitz , Princeton University
Location:
Fine Hall 314
November 21, 2013
2:00pm - 3:30pm
##### Renormalization group and stochastic PDEs
###### Ergodic Theory & Statistical Mechanics

I will discuss some recent works on applying rigorous renormalization group methods to the study of stochastic PDEs. I will mainly focus on a model of turbulent transport by the shear flow.

Speaker: Hao Shen , Princeton University
Location:
Fine Hall 601
November 21, 2013
4:30pm - 5:30pm
##### Scale invariant solutions to Navier Stokes equation and implications to Leray-Hopf weak solutions
###### Analysis of Fluids and Related Topics

In this talk, I will first discuss the existence of scale invariant solutions to Navier Stokes equation with arbitrary $-1$ homogeneous initial data. Since these solutions may not be small, linearized analysis seem to suggest nontrivial bifurcations.

Speaker: Hao Jia , University of Chicago
Location:
Fine Hall 322
November 21, 2013
4:30pm - 5:30pm
##### Genus of abstract modular curves with level l structure
###### Princeton University/IAS Number Theory Seminar

To any bounded family of \F_l-linear representations of the etale fundamental of a curve X one can associate families of abstract modular curves which, in this setting, generalize the `usual' modular curves with level l structure (Y_0(l), Y__1(l), Y(l) etc.). Under mild hypotheses, it is expected that the genus (and even the geometric gonality) of these curves goes to infty with l.

Speaker: Anna Cadoret , IAS/Ecole Polytechnique
Location:
IAS Room S-101
November 21, 2013
4:30pm - 5:30pm
##### Topological Actions of Connected Compact Lie Groups on Manifolds
###### Algebraic Topology Seminar

THIS IS A JOINT ALGEBRAIC TOPOLOGY / TOPOLOGY SEMINAR. PLEASE NOTE DIFFERENT TIME AND LOCATION. We survey some new methods and results on existence and on topological classification
of actions of connected, compact Lie groups on manifolds. PLEASE CLICK ON SEMINAR TITLE FOR COMPLETE ABSTRACT.

Speaker: Sylvain Cappell, Courant Institute, NYU
Location:
Fine Hall 314
November 21, 2013
4:30pm - 5:30pm
##### Topological Actions of Connected Compact Lie Groups on Manifolds
###### Topology Seminar

THIS IS A JOINT TOPOLOGY / ALGEBRAIC TOPOLOGY SEMINAR. We survey some new methods and results on existence and on topological classification of actions of connected, compact Lie groups on manifolds. PLEASE CLICK ON SEMINAR TITLE FOR COMPLETE ABSTRACT.

Speaker: Sylvain Cappell, Courant Institute, NYU
Location:
Fine Hall 314