Week of April 30, 2023

Mon May 1, 2023
12:00pm - zoom - Probability and Analysis Webinar
Alexia Yavicoli - (University of British Columbia)
TBA

https://sites.google.com/view/paw-seminar

Tue May 2, 2023
4:00pm - ISEB 1200 - Differential Geometry
Sumio Yamada - (Gakushuin University)
Harmonic maps in general relativity

Herman Weyl in 1916 described the Schwarzschild metric
by a single harmonic function with a pole.  Since then, the Einstein
equation with time symmetry can be regarded as an elliptic variational
problem, and I will report on the recent progress in this direction,
including a series of collaborative work with Gilbert Weinstein and Marcus
Khuri.  We will introduce spactimes of dimension four and five with some
rotational symmetries, and discuss the difference in 4 and 5, and some new
geometric consequences..

Wed May 3, 2023
12:00pm to 1:00pm - RH 340A - UCI Mathematics Alumni Lectures
Nick Treuer - (Texas A&M University)
Alumni Talk

In this talk, I will discuss my experience as a math Ph.D. student at UCI (2015-2021), the job application process for postdoctoral research positions in math and differences and similarities between being a Ph.D. student and a visiting assistant professor.

 

1:00pm to 2:00pm - 440R Rowland Hall - Combinatorics and Probability
Jonathan Shi - (UCSD)
Sum-of-squares proofs for the trace power method

The sum-of-squares framework converts proofs into algorithms so long as those proofs can be formulated as sum-of-squares proofs—proofs that demonstrate their conclusions via the non-negativity of square polynomials. This is a powerful framework that captures many inequalities known in analysis. We formulate sum-of-squares proofs for the trace power method by giving sum-of-squares proofs for non-commutative (matrix) inequalities including the Araki-Lieb-Thirring inequality and Holder's inequality for Schatten norms, and sketch how one might use these proofs to obtain algorithms to constructively find solutions to random optimization problems whose upper bounds can be proven by techniques in random matrix and spin glass theory. Based on work in progress with Juspreet Singh Sandhu.

Fri May 5, 2023
3:00am to 4:00am - RH440R - Nonlinear PDEs
Lei Zhang - (University of Florida)
Asymptotic behavior of solutions to the Yamabe equation in low dimensions

In this talk I will report recent progress on the Yamabe equation defined either on a punctured disk of a smooth manifold or outside a compact subset of $\mathbb R^n$ with an asymptotically flat metric.  What we are interested in is the behavior of solutions near the singularity. It is well known that the study of the Yamabe equation is sensitive to the dimension of the manifold and is closely related to the Positive Mass Theorem. In my recent joint works with Jingang Xiong (Beijing Normal University) and Zhengchao Han (Rutgers) we proved dimension-sensitive results and our work showed connection to other problems. 

1:00pm - RH 114 - Graduate Seminar
Katya Krupchyk - (UCI)
Inverse problems for elliptic PDE