TBA by Joris Roos
- Series
- Analysis Seminar
- Time
- Wednesday, April 16, 2025 - 14:00 for 1 hour (actually 50 minutes)
- Location
- Skiles 005
- Speaker
- Joris Roos – University of Massachusetts Lowell – joris_roos@uml.edu
TBD
TBA
Please Note: Zoom link: https://gatech.zoom.us/j/91390791493?pwd=QnpaWHNEOHZTVXlZSXFkYTJ0b0Q0UT09
TBA
Given an r-uniform hypergraph H, the random Turán number ex(Grn,p,H) is the maximum number of edges in an H-free subgraph of Grn,p, where Grn,p is the Erdős-Rényi random hypergraph with parameter p. In the case when H is not r-partite, the problem has been essentially solved independently by Conlon-Gowers and Schacht. In the case when H is r-partite, the degenerate case, only some sporadic results are known.
The Sidorenko conjecture is a notorious problem in extremal combinatorics. It is known that its hypergraph analog is not true. Recently, Conlon, Lee, and Sidorenko discovered a relation between the Sidorenko conjecture and the Turán problem.
In this talk, we introduce some recent results on the degenerate random Turan problem and its relation to the hypergraph analog of the Sidorenko conjecture.
The work deals with the existence of solutions of an integro-differential equation in the case of the normal diffusion and the influx/efflux term proportional to the Dirac delta function in the presence of the drift term. The proof of the existence of solutions relies on a fixed point technique. We use the solvability conditions for the non-Fredholm elliptic operators in unbounded domains and discuss how the introduction of the transport term influences the regularity of the solutions.
https://gatech.zoom.us/j/94295986362?pwd=8euEJ3ojkWl5c3Y3hLyXTiKBts3Rrq.1
Beta-ensembles generalize the eigenvalue distributions of self-adjoint
real, complex, and quaternion matrices for beta=1,2, and 4,
respectively. These ensembles naturally extend to two dimensions by
introducing operations such as corner truncation, addition, or
multiplication of matrices. In this talk, we will explore the edge
asymptotics of the resulting two-dimensional ensembles. I will present
the Airy-beta line ensemble, a universal object that governs the
asymptotics of time-evolving largest eigenvalues. This ensemble
consists of an infinite collection of continuous random curves,
parameterized by beta. I will share recent progress in developing a
framework to describe this remarkable structure.