Previous Conferences & Workshops

Feb
25
2015

Topology of Algebraic Varieties

Automorphisms of smooth canonically polarised surfaces in characteristic 2
Nikolaos Tziolas
11:15am|S-101

Let $X$ be a smooth canonically polarised surface defined over an algebraically closed field of characteristic 2. In this talk I will present some results about the geometry of $X$ in the case when the automorphism scheme $\mathrm{Aut}(X)$ of $X$ is...

Feb
24
2015

Topology of Algebraic Varieties

Projectivity of the moduli space of KSBA stable pairs and applications
Zsolt Patakfalvi
2:00pm|S-101

KSBA (Kollár-Shepherd-Barron-Alexeev) stable pairs are higher dimensional generalizations of (weighted) stable pointed curves. I will present a joint work in progress with Sándor Kovács on proving the projectivity of this moduli space, by showing...

Feb
24
2015

Computer Science/Discrete Mathematics Seminar II

Computing inverses
Louis Rowen
10:30am|S-101

We compare methods of computing inverses of matrices over division rings. The most direct way is via Cohn's theory of full matrices, which was improved by Malcolmson, Schofield, and Westreich. But it is simpler to work with finite dimensional...

Feb
23
2015

Members’ Seminar

Arthur's trace formula and distribution of Hecke eigenvalues for $\mathrm{GL}(n)$
2:00pm|S-101

A classical problem in the theory of automorphic forms is to count the number of Laplace eigenfunctions on the quotient of the upper half plane by a lattice $L$. For $L$ a congruence subgroup in $\mathrm{SL}(2,\mathbb Z)$ the Weyl law was proven by...

Feb
23
2015

Computer Science/Discrete Mathematics Seminar I

Lower bounds for clique vs. independent set
11:15am|S-101

We prove an $\omega(\log n)$ lower bound on the conondeterministic communication complexity of the Clique vs. Independent Set problem introduced by Yannakakis (STOC 1988, JCSS 1991). As a corollary, this implies superpolynomial lower bounds for the...

Feb
20
2015

Joint IAS/Princeton University Symplectic Geometry Seminar

The symplectic displacement energy
Peter Spaeth
1:30pm|S-101

To begin we will recall Banyaga's Hofer-like metric on the group of symplectic diffeomorphisms, and explain its conjugation invariance up to a factor. From there we will prove the positivity of the symplectic displacement energy of open subsets in...

Feb
19
2015

Joint IAS/Princeton University Number Theory Seminar

Eigencurve over the boundary of the weight space
Liang Xiao
4:30pm|S-101

Eigencurve was introduced by Coleman and Mazur to parametrize modular forms varying $p$-adically. It is a rigid analytic curve such that each point corresponds to an overconvegent eigenform. In this talk, we discuss a conjecture on the geometry of...

Feb
19
2015

Joint IAS/Princeton University Symplectic Geometry Seminar

Existence of Lefschetz fibrations on Stein/Weinstein domains
2:30pm|Fine 110, Princeton University

I will describe joint work with E. Giroux in which we show that every Weinstein domain admits a Lefschetz fibration over the disk (that is, a singular fibration with Weinstein fibers and Morse singularities). We also prove an analogous result for...

Feb
18
2015

Mathematical Conversations

Riemann-Hilbert problems
6:00pm|Dilworth Room

One of the central topics in Complex Analysis deals with the issue of identifying natural conditions that uniquely determine a holomorphic function. A prominent role in this regard is played by the one-sided and transmission Riemann-Hilbert problems...