# Seminars & Events for 2017-2018

November 6, 2017
3:00pm - 4:00pm
##### Nonlinear stability of Minkowski spacetime for self-gravitating massive fields
###### Analysis Seminar

I will discuss the global evolution problem for self-gravitating massive matter in the context of Einstein's theory and, more generally, of the f(R)-theory of gravity. In collaboration with Yue Ma (Xian), by analyzing the Einstein equations in wave gauge coupled to Klein-Gordon equations, I have established that Minkowski spacetime is globally nonlinearly stable in presence of massive fields.

Speaker: Phillippe LeFloch , Paris 6
Location:
Fine Hall 314
November 6, 2017
4:00pm - 5:00pm
##### Symmetry methods for quantum variational principles and expectation value dynamics
###### PACM/Applied Mathematics Colloquium

Inspired by previous works by Kramer & Saraceno and Shi & Rabitz, this talk exploits symmetry methods for the variational formulation of different problems in physics and chemistry.

Speaker: Cesare Tronci, University of Surrey, Guilford, UK
Location:
Fine Hall 214
November 6, 2017
4:00pm - 5:00pm
##### Morse-Bott cohomology from homological perturbation
###### Joint PU/IAS Symplectic Geometry Seminar

In this talk, I will give a new construction of the Morse-Bott cochain complex, where the underlying vector space is generated by the cohomology of the critical manifolds. This new construction has two nice features: (1) It requires the minimum amount of transversality. (2) The choices made in the construction do not depend on the moduli spaces.

Speaker: Zhengyi Zhou, UC Berkeley
Location:
IAS Room S-101
November 7, 2017
9:30am - 3:30pm
##### Princeton-Tokyo Fluid Mechanics Workshop
###### Special Events and Conferences

A 3-day workshop bringing together researchers from Princeton and Tokyo working in the field of mathematical fluid dynamics. New recent results and possible future directions will be discussed.

Workshop Organizers:  Peter Constantin, Yoshikazu Giga, Vlad Vicol.

Speaker: various speakers,
Location:
November 7, 2017
3:00pm - 4:00pm
##### On some problems in random discrete matrices
###### Topics in Probability

In this talk we survey some interesting problems related to the singularity problem of random discrete matrices. In particular, we discuss the following problems:

1. an extension of an old problem of Odlyzko about the probability for randomly chosen $\pm 1$ vectors to intersect the hypercube \{1,-1\}^n in a non-trivial way, and

Speaker: Asaf Ferber, MIT
Location:
Fine Hall 110
November 7, 2017
4:30pm - 5:30pm
##### Hydrodynamics of integrable classical and quantum systems
###### Mathematical Physics Seminar

Discussed is the Euler-type hydrodynamics for one-dimensional integrable quantum systems, as the Lieb-Liniger delta Bose gas and the XXZ chain. Of particular interest are domain wall initial states. We will use classical hard rods as an illustration of the underlying structure.

Speaker: Herbert Spohn , Technical University Munich and Columbia University
Location:
November 7, 2017
4:30pm - 5:30pm
##### Dominating varieties by liftable ones.
###### Algebraic Geometry Seminar

Given a smooth projective variety over an algebraically closed field of positive characteristic, can we dominate it by another smooth projective variety that lifts to characteristic 0? We give a negative answer to this question.

Speaker: Remy van Dobben de Bruyn, Columbia University
Location:
Fine Hall 314
November 8, 2017
9:30am - 3:30pm
##### Princeton-Tokyo Fluid Mechanics Workshop
###### Special Events and Conferences

A 3-day workshop bringing together researchers from Princeton and Tokyo working in the field of mathematical fluid dynamics. New recent results and possible future directions will be discussed.

Workshop Organizers:  Peter Constantin, Yoshikazu Giga, Vlad Vicol.

Speaker: various speakers,
Location:
November 8, 2017
2:30pm - 3:30pm
##### Provably good convex methods for mapping problems
###### PACM IDeAS

Computing mappings or correspondences between surfaces is an important tool for many applications in computer graphics, computer vision, medical imaging, morphology and related fields. Mappings of least angle distortion (conformal) and distance distortion (isometric) are of particular interest.

Location:
Fine Hall 224
November 8, 2017
4:30pm - 5:30pm
##### Fluids and Boundaries
###### Department Colloquium

I will present recent work on two kinds of boundary interactions for incompressible fluids. I will first describe results concerning the evolution of the free boundary surrounding an elastic body immersed in a viscous incompressible fluid. At the interface elasticity meets the Navier-Stokes equations. I will then describe results concerning a nonlocal equation (SQG) in a bounded domain.

Speaker: Mihaela Ignatova , Princeton University
Location:
Fine Hall 314
November 9, 2017
9:30am - 12:30pm
##### Princeton-Tokyo Fluid Mechanics Workshop
###### Special Events and Conferences

A 3-day workshop bringing together researchers from Princeton and Tokyo working in the field of mathematical fluid dynamics. New recent results and possible future directions will be discussed.

Workshop Organizers:  Peter Constantin, Yoshikazu Giga, Vlad Vicol.

Speaker: various speakers,
Location:
Fine Hall 110
November 9, 2017
12:30pm - 1:30pm
##### Restriction problem with polynomial partitioning

In harmonic analysis, people are interested in the following problem: up to a constant, for any function, can we control the L_q norm of its Fourier transform restricted to the unit sphere, by the L_p norm of the function itself? The restriction conjecture is about all possible pairs (p, q) such that this statement holds.

Speaker: Lingfu Zhang, Princeton University
Location:
Fine Hall 110
November 9, 2017
1:30pm - 3:00pm
##### Quasi-periodic Solutions for Nonlinear Klein-Gordon Equations
###### Ergodic Theory & Statistical Mechanics

We construct time quasi-periodic solutions to the nonlinear Klein-Gordon equations on the torus in arbitrary dimensions. This generalizes the method developed in the limit-elliptic setting to the hyperelliptic one, by using in addition, a Diophantine property of algebraic numbers. It presents a general direct approach to second-order in time equations.

Speaker: Wei-Min Wang, IAS
Location:
Fine Hall 1001
November 9, 2017
3:00pm - 4:00pm
##### Hook formulas for counting skew Standard Young Tableaux with applications
###### Discrete Mathematics Seminar

Enumeration of linear extensions (total orderings) of partially ordered sets (posets) is a classical topic in discrete mathematics.

Speaker: Greta Panova, University of Pennsylvania
Location:
Fine Hall 224
November 9, 2017
3:00pm - 4:00pm
##### Basic String Topology
###### Algebraic Topology Seminar

Let M be a compact, oriented manifold and LM the space of maps of the circle into M, the free loop space of M. I will give simplified, chain level definitions for the Chas-Sullivan "loop" product and coproduct on the homology of LM, and a lift of the coproduct from relative to absolute homology.  Interactions between the product and coproduct will be discussed.

Speaker: Nancy Hingston, The College of New Jersey
Location:
Fine Hall 110
November 9, 2017
4:30pm - 5:30pm
##### Peculiar modules for 4-ended tangles
###### Topology Seminar

A peculiar module is a certain algebraic invariant of 4-ended tangles that I developed in my PhD thesis as a tool for studying the local behaviour of Heegaard Floer homology for knots and links. I will briefly explain its construction and describe its classification in terms of immersed curves on a 4-punctured sphere as well as a glueing formula.

Speaker: Claudius Zibrowius, Sherbrooke University
Location:
Fine Hall 314
November 10, 2017
2:30pm - 3:30pm
##### The ACC for log canonical threshold polytopes
###### Algebraic Geometry Seminar

The LCT (log canonical thresholds) is an invariant which measures the complexity of singularities. A conjecture due to Shokurov predicts that LCT for a single divisor satisfy the ACC (ascending chain condition), and it was proven by Hacon-McKernan-Xu.

Speaker: Jingjun Han, Peking University
Location:
Fine Hall 110
November 13, 2017
3:00pm - 4:00pm
##### Almost global existence of solutions for space periodic capillarity-gravity water waves equations
###### Analysis Seminar

We prove that any solution of the Cauchy problem for the capillarity-gravity water waves equations, in one space dimension, with periodic, even in space, initial data of small size \ep , is almost globally defined in time on Sobolev spaces, i.e.

Speaker: Massimiliano Berti, SISSA
Location:
Fine Hall 314
November 13, 2017
4:00pm - 5:00pm
##### Odd sphere bundles and symplectic manifolds
###### Joint PU/IAS Symplectic Geometry Seminar

I will motivate the consideration of a special class of odd dimensional sphere bundles over symplectic manifolds. These bundles give a novel topological perspective for symplectic geometry. In particular, the symplectic A-infinity algebra recently found by Tsai-Tseng-Yau turns out to be equivalent to the standard de Rham differential graded algebra of forms on the sphere bundles.

Speaker: Li-Sheng Tseng, University of California at Irvine
Location:
Fine Hall 224
November 13, 2017
4:00pm - 5:00pm
##### Recent developments in dimensional free estimates in harmonic analysis
###### Analysis Seminar

We will discuss some recent developments in dimensional-free bounds for the Hardy--Littlewood averaging operators defined over convex symmetric bodies in $\mathbb R^d$. Specifically we will