# Seminars & Events for 2011-2012

December 2, 2011
3:00pm - 4:00pm
##### Large Time Behavior of Periodic Viscosity Solutions of Integro-differential Equations
###### Differential Geometry & Geometric Analysis Seminar

In this talk, I will present some recent results on the asymptotic behavior of periodic viscosity solutions of parabolic integro-differential equations (where nonlocal terms are associated with Levy-It\^o operators). In particular, we address the problem to mixed integro-differential equations, e.g.

Speaker: Adina Ciomaga, University of Chicago
Location:
Fine Hall 314
December 2, 2011
4:30pm - 5:30pm
##### Ramussen's s-Invariant via Instantons and Other Remarks on Khovanov Homology as Seen by Instanton Floer Homology
###### Joint PU/IAS Symplectic Geometry Seminar
Speaker: Tom Mrowka, MIT
Location:
IAS Room S-101
December 5, 2011
4:30pm - 5:30pm
##### Nonlocal Evolution Equations
###### PACM/Applied Mathematics Colloquium

Nonlocal evolution equations have been around for a long time, but in recent years there have been some nice new developments.

Speaker: Peter Constantin, Princeton University
Location:
Fine Hall 214
December 5, 2011
4:30pm - 5:30pm
##### Nonlocal Evolution Equations
###### Analysis Seminar

Nonlocal evolution equations have been around for a long time, but in recent years there have been some nice new developments.

Speaker: Peter Constantin, Princeton University
Location:
Fine Hall 214
December 6, 2011
4:30pm - 5:30pm
##### Bertini theorems for F-singularities
###### Algebraic Topology Seminar

I will discuss Bertini theorems for F-singularities ( i.e. singularities defined by Frobenius); the proof is based on a slight generalization of Cumino-Greco-Manaresi's axiomatic approach to Bertini theorems. This is a joint work with Karl Schwede.

Speaker: Wenliang Zhang, University of Michigan
Location:
Fine Hall 322
December 7, 2011
2:00pm - 3:00pm
##### Universal conductivity in graphene; some rigorous results and open problems
###### Statistical Mechanics Seminar

Recent experiments have found an universal value for the dynamic conductivity in graphene, fully confirming theoretical predictions based on a non interacting tight binding model. This however poses a problem since one could expect a many body renormalization of the non interacting value of the conductivity due to the interaction.

Speaker: V. Mastropietro, University of Rome "Tor Vergata"
Location:
Fine Hall 224
December 7, 2011
4:30pm - 5:30pm
##### Some applications of almost mathematics
###### Department Colloquium

I will try to explain how, by inserting the word "almost" in appropriate places in a commutative algebra textbook and using the fact that $\mathbb{Q}_p$ an $\mathbb{F}_p((t))$ have the same residue field, Faltings gave a new proof of a result of Fontaine and Wintenberger relating the absolute Galois groups of these two fields.

Speaker: Sophie Morel, Harvard University
Location:
Fine Hall 314
December 8, 2011
2:15pm - 3:15pm
##### On Sidorenko's Conjecture
###### Discrete Mathematics Seminar

The Erdos-Simonovits-Sidorenko conjecture is well-known in combinatorics but it has equivalent formulations in analysis and probability theory. The shortest formulation is an integral inequality related to Mayer integrals in statistical mechanics and Feynman integrals in quantum field theory. We present new progress in the area. Part of the talk is based on joint results with J.L. Xiang Li.

Speaker: Balazs Szegedy, University of Toronto
Location:
Fine Hall 224
December 8, 2011
4:30pm - 6:30pm
##### The Jones polynomial and surfaces far from fibers
###### Topology Seminar

This talk explores relations between colored Jones polynomials and the topology of incompressible spanning surfaces in knot and link complements. Under mild diagrammatic hypotheses, we prove that the growth of the degree of the colored Jones polynomials is a boundary slope of an essential surface in the knot complement.

Speaker: David Futer, Temple University
Location:
Fine Hall 314
December 8, 2011
4:30pm - 5:30pm
##### The Jones polynomial and surfaces far from fibers
###### Topology Seminar

This talk explores relations between colored Jones polynomials and the topology of incompressible spanning surfaces in knot and link complements. Under mild diagrammatic hypotheses, we prove that the growth of the degree of the colored Jones polynomials is a boundary slope of an essential surface in the knot complement.

Speaker: David Futer, Temple University
Location:
Fine Hall 314
December 8, 2011
4:30pm - 5:30pm
##### Weights in a Serre-type conjecture for U(3)
###### Princeton University/IAS Number Theory Seminar

We consider a generalisation of Serre's conjecture for irreducible, conjugate self-dual Galois representations rho : $G_F -> GL_3(\bar F_p)$, where $F$ is an imaginary quadratic field in which $p$ splits. We previously gave a conjecture for the possible Serre weights of rho.

Speaker: Florian Herzig, University of Toronto
Location:
Fine Hall 214
December 9, 2011
4:30pm - 5:30pm
##### Bihermitian metrics and Poisson deformations
###### Joint PU/IAS Symplectic Geometry Seminar

A bihermitian metric (or generalized Kahler structure) involves a pair of complex structures and a metric compatible with both. The study of these is closely related to that of holomorphic Poisson structures on a manifold.

Speaker: Nigel Hitchin, Oxford University and Simons Center
Location:
Fine Hall 322
December 12, 2011
4:00pm - 5:00pm
##### Vinogradov estimates applied to maximal theorems related to Waring's problem
###### Analysis Seminar

I'll discuss the discrete spherical maximal function of Magyar--Stein--Wainger and it's estimates. Then I'll prove recent results for higher degrees which use Vinogradov type estimates for exponential sums to improve results about maximal functions defined on the hypersurfaces arising in Waring's problem.

Speaker: Kevin Hughes, Princeton University
Location:
Fine Hall 314
December 13, 2011
4:30pm - 5:30pm
##### Varieties fibered by good minimal models
###### Algebraic Geometry Seminar

Let $f:X->Y$ be an algebraic fiber space such that the general fiber has a good minimal model. We show that if $f$ is the Iitaka fibration then $X$ has a good minimal model. The result reduces the minimal model conjecture to the case of varieties of Kodaira dimension zero and the non-vanishing conjecture.

Speaker: Ching-Jui Lai, University of Utah
Location:
Fine Hall 322
December 14, 2011
2:00pm - 3:00pm
##### Crossing probabilities, their densities, and modular forms
###### Statistical Mechanics Seminar

A crossing probability is the probability of finding a critical cluster that touches specified boundary arcs.

Speaker: P. Kleban, Univeristy of Maine
Location:
Fine Hall 224
December 14, 2011
4:00pm - 5:00pm
##### Global Stability Results for Relativistic Fluids in Expanding Spacetimes
###### Analysis Seminar

In this talk, I will discuss the future-global nonlinear behavior of relativistic fluids evolving in expanding spacetimes. I will focus on how the global behavior of the fluid is affected by both the spacetime expansion rate and the fluid equation of state.

Speaker: Jared Speck, MIT
Location:
Fine Hall 314
December 14, 2011
4:30pm - 5:30pm
##### Theta Constant Identities on $Z_n$ Curves
###### Algebraic Geometry Seminar

In this talk we shall expose a concrete relation between the algebraic and transcendental parameters of a nonsingular $z_n$ curve.

Speaker: Hershel Farkas, Einstein Institute of Mathematics, The Hebrew University of Jerusalem
Location:
Fine Hall 322
December 15, 2011
2:15pm - 3:15pm
##### Subspace evasive sets
###### Discrete Mathematics Seminar

We describe an explicit, simple, construction of large subsets of F^n, where F is a finite field, that have small intersection with every k-dimensional affine subspace.

Speaker: Zeev Dvir, Princeton University
Location:
Fine Hall 224
December 15, 2011
4:30pm - 5:30pm
##### Mapping class groups of Heegaard splittings
###### Topology Seminar

The mapping class group of a Heegaard splitting for a given 3-manifold is the group of automorphisms of the 3-manifold that take the Heegaard surface onto itself, modulo isotopies that preserve the surface setwise. This can be viewed as a subgroup of the mapping class group of the surface.

Speaker: Jesse Johnson, Oklahoma State University
Location:
Fine Hall 314
December 15, 2011
4:30pm - 5:30pm
##### Spectral factors in endoscopic transfer
###### Princeton University/IAS Number Theory Seminar

This talk is based on some results for real groups used in Arthur's classification of global packets for classical groups. The setting is twisted endoscopy for a connected reductive algebraic group over the reals. There is a geometric transfer which generates useful test functions on the real points of an endoscopic group.