Date  Speaker  Title  Abstract 
Feb 4  Qixiao Ma  Analytic theory of abelian varieties 

Feb 11  Mitchell Faulk  The modern formulation of TQFTs 
I'll try to motivate and introduce the modern formulation of a topological quantum field theory (TQFT), inspired by Segal's and Atiyah's original axioms, as a symmetric monoidal functor from a certain bordism category to the category of vector spaces. For motivation, I'll look at classical field theories in physics, and explain how a topological quantum field theory can be viewed as a ``quantization'' of a certain classical model, called the nonlinear sigma model. If time permits, I'll discuss examples of TQFTs and their applications to other areas. 
Feb 18  Joshua Seaton  Extrapolating factorials: the Gamma function, classical and padic 
Graph the points \((n, n!)\) in the plane for positive integers \(n\); there are a continuum of curves that go through these points. So why does the Gamma function  among the infinitelymany other candidates  deserve to be regarded as the 'factorial function'? The BohrMollerupArtin Theorem tells us why, which reveals that a function satisfying a couple of mild 'factorial'like properties necessarily has to be the Gamma function. We first go through this brief, neat result. Then, in the second part of this talk, we look at the padic side of things (we will introduce padic numbers gently here, I promise.) In the ring of padic integers, the usual integers are dense. So  in high contrast to the setting over the real numbers  an integervalued function on the integers (if padically continuous) will lift uniquely to a function on the padic integers! After some minor tweaking to the function that maps \(n\) to \(n!\), we will take a brief look at its (unique) padic extension, the padic Gamma function. 
Feb 25  Linus Hamann  A journey through elliptic curves 
In this talk, we will begin with a classical overview of the definition of an elliptic curve and associated properties. Afterwords, we will introduce some of the tools and terminology used in the algebraic geometry of smooth curves, including the Picard group, differentials, and RiemannRoch. The remainder of the talk will be dedicated to using this new terminology to illuminate various features of the classical view of elliptic curves and thereby give insight into their importance. 
March 4  Irit HuqKuruvilla  The combinatorial Nullstellensatz 
In this talk I will state and prove the Combinatorial Nullstellensatz and illustrate the power of the theorem by using it to give short, beautiful solutions to many problems. The results we will prove include the CauchyDavenport theorem, a fundamental result in additive number theory, and a result about hyperplane arrangements that was the 6th problem at the 2007 International Mathematical Olympiad. This talk presumes little technical knowledge, and should be accessible to general audiences. 
March 11  Karsten Gimre  PDEs and general relativity 
I will describe some advances made in hyperbolic partial differential equations in the last thirty years, with an eye towards application in the dynamics of Einstein's field equations, in particular gravitational wave detection and formation of black holes. It will not be assumed that the audience is familiar with either hyperbolic PDE or relativity. 
March 18  Spring break  
March 25  Sander MackCrane  Moonshine  Moonshine is a sporadic collection of mysterious connections between the algebraic world of finite groups and the numbertheoretic world of modular functions. We will first introduce these worlds and discuss their independent interest. Then we will examine the moonshine that connects them, starting with its discovery and building up to some recent directions in the theory. 
April 1  Willie Dong  Regularity of the Linearized NavierStokes Equations 
In this talk, we will state the linearized NavierStokes equations, prove the existence and uniqueness of weak solutions, and use Lebesgue elliptic estimates to derive regularity results; we will introduce tools from classical functional analysis (i.e. segment property, function spaces, weak convergence) along the way. 
April 8  Robbie Lyman  Geometric Group Theory  
April 15  Matei Ionita Nilay Kumar 
BorelWeilBott and BeilinsonBernstein 
We review the basics of the representation theory of complex semisimple Lie algebras via the theory of highest weights. We make contact with algebraic/complex geometry through the theorem of BorelWeilBott, which we then generalize to BeilinsonBernstein localization. Familiarity with vector bundles and/or sheaves is recommended. 
April 22  Cosmin Pohoata  
April 29  Xiangwen Zhang 