Pizza Seminar

2018

Date	Speaker	Title
April 23	George Lusztig	The Lie group of type E8
April 2	Max Engelstein	Not all Critical Points are Minimizers
March 19	Philippe Rigollet	The sample complexity of multi-reference alignment
February 12	Steven Johnson	Upper bounds on wave-matter interactions
February 12	Henry Cohn	The Gaussian core model in high dimensions

2017

Date	Speaker	Title
	David Jerison	The Two-Hyperplane conjecture
Spring	David Vogan	W-Graphs
Spring	Andrei Negut	Moduli of semistable sheaves and representation theory
Spring	Andrew Lawrie	Bubbling for geometric wave equations
Spring	Larry Guth	Using Fourier analysis to study diophantine equations

2013

Date	Speaker	Title
May 6	George Lusztig	Affine Hecke algebras
April 29	William Minicozzi	Geometric Flows
April 22	Gigliola Staffilani	Dispersive equations and their role beyond PDE
April 8	Jacob Fox	The Graph Regularity Method
February 25	Scott Sheffield	Log-correlated Gaussian fields

2012

Date	Speaker	Title
December 3	Steven Johnson	Mathematical formulations of radiative heat transfer
November 19	Aaron Naber	Quantitative Stratification and regularity for harmonic maps
October 29	Bill Minicozzi	Singularities and dynamics of mean curvature flow
October 15	Larry Guth	The waist inequality in geometry and combinatorics
October 1	Katrin Wehrheim	Moduli spaces of pseudoholomorphic curves
September 19	Mark Behrens	Exotic spheres
May 7	Goncalo Tabuada	Homological ⊂ Homotopical Algebra
April 2	Jared Speck	The Geometric Analysis of Wave Equations
March 12	Roman Bezrukavnikov	Representation categories found in algebraic geometry
February 27	Lie Wang	Recovery of high dimensional sparse signals
February 13	Gigliola Staffilani	Dispersive equations and their role beyond PDE

2011

Date	Speaker	Title
December 5	Mark Behrens	Calculus of functors
November 21	Sug Woo Shin	Families and equidistribution
November 7	Victor Guillemin	Riemann sums vs. Riemann integrals
October 24	Pavel Etingof	The PRIMES progam
October 3	Abhinav Kumar	Sphere packing and related optimization problems
April 25	Susan J. Sierra (Princeton)	What is a Noncommutative Polynomial Ring?
April 11	Katrin Wehrheim	How to construct topological invariants via decompositions and the symplectic category
March 28	Richard Melrose	Spin structures and singularities
March 14	Tom Mrowka	The strange world of 4-dimensional manifolds
February 14	Henry Cohn	Abstract

2010

Time: Monday, 12:00 - 1:00pm

Location: Room 2-139

Goodies: Pizza and beverages will be available at 1pm in 2-290

Date	Speaker	Title
December 6	Davesh Maulik	A classical question in algebraic geometry concerns counting curves in some ambient space. That is, if we fix some discrete parameters and geometric conditions, how many curves are there on an algebraic variety which satisfy these conditions? In the special case when the ambient space is three-dimensional, there are two approaches to these sorts of questions - via counting maps or counting sheaves. In this talk, we will introduce these approaches and explain questions/progress in understanding their relationship to each other.
November 29	Abhinav Kumar	The "exceptional" root lattices $E_6$, $E_7$, and $E_8$ arise in the classification of root lattices, Lie algebras and so on. These lattices have many remarkable properties: they are the densest lattices in their dimensions, their root systems have give rise to remarkable spherical codes, with large automorphism groups. These root systems also arise in the consideration of exceptional curves on del Pezzo surfaces in algebraic geometry. I will describe this classical connection, and time permitting, touch on another - that with rational elliptic surfaces.
November 15	Martin Bazant	Nonlinear Dynamics of Electrochemical Systems
November 1	Jacob Fox	Ramsey Theory
October 18	Jonathan Kelner	Electrical Flows, Laplacian Systems and Faster Approximation of Maximum Flow in Undirected Graphs
October 4	David Vogan	Unitary Group Representations
September 20	Scott Sheffield	How do you divide your (two-dimensional) time? SLE and teh quantum gravity zipper
April 26	Abhinav Kumar	What is the densest arrangement of spheres in Euclidean space R^n? The simplest ones to describe are those in which the sphere centers are arranged in a lattice, but even in as low as three dimensions, periodic structures (the Barlow packings) tie with the face-centered cubic (or A_3 lattice) arrangement for the top spot. In ten dimensions, the best packing known (discovered by Best) is periodic and not a lattice. One can attempt to make dense periodic configurations by minimizing (average) potential energy for a suitable potential function, such as a steeply decreasing inverse power law. I will describe recent joint work with Cohn and Schurmann which carries out these computational experiments for Gaussian potential functions, and some surprising results, including the presence of "duals" for some non-lattice periodic structures.
February 22	Sigurdur Helgason	This lecture deals with Radon's problem of determining a function f in terms of its integral over certain submanifolds. There are two sides to the problem, namely inversion formulas and support theorems. Several examples of each will be discussed.

2008

Time: Tuesday, 12:00 - 1:00pm

Location: Room 2-102

Goodies: Pizza and beverages will be available at 1pm in 2-290

Date	Speaker	Title
December 9	David Vogan	"The Uncertainty Principle for Algebraists: Research Problems About Diagonalizing Matrices"
November 18	Katrin Wehrheim	"Some Connections Between Gauge Theory and Symplectic Topology"
October 28	Scott Sheffield	"Random Fractals and Symmetry"
October 14	Mark Behrens	TBA
September 30	Bjorn Poonen	"Rational Periodic Points of Polynomials"
September 16	Tom Mrowka	"Dissecting 3-Manifolds"

2007

Time: Monday, 12:00 - 1:00pm

Location: Room 2-190

Goodies: Pizza and beverages will be available at 1pm in 2-290

Date	Speaker	Title
December 10	Lars Hesselholt	Higher algebraic K-theory
December 3	Richard Melrose	Configuration spaces and Magnetic Monopoles
November 26	Ju-Lee Kim	Harmonic analysis on $SL_2 (R)$
November 19	Mike Artin	Noncommutative Surfaces Birationally = Skew Fields of Dimension Two
November 5	John Bush	Rationalizing Nature's Designs
October 29	Toby Colding	Change of width under flows
October 22	James McKernan	A tour through birational geometry
October 15	David Vogan	How big is infinite-dimensional
October 1	Richard Stanley	Combinatorics and Representation Theory
September 17	Jacob Lurie	Topological Quantum Field Theories in Low Dimensions
September 10	Pavel Etingof	Double affine Hecke algebras