Past Events

E.g., Apr 20, 2024

Neda Abasi

UBC
Ergodic Theory and Dynamical Systems

March 18, 2024

ESB 4127

We study the family of one dimensional piecewise smooth dynamical systems in which two classic theorems are still permanent. One of them is Birkhoff Transitivity Theorem and the other one is Banks, Brooks, Cairns, Davis and Stacey Theorem. Baker like maps with N-branches ( N>2 ) constitute an... Read more

Trevor Campbell

UBC
Trevor Campbell's Talk: Bayesian Inference for Big Data

March 15, 2024

ESB 1012 (PIMS building)

Since shortly after the popularization of stochastic gradient optimization methods in machine learning---which now scale model training to billions of examples and beyond---researchers have been trying to use the same basic data subsampling techniques to speed up computational Bayesian inference... Read more

Amanda Young

UIUC
On Gapped Ground State Phases of Decorated AKLT Models

March 14, 2024

ESB 4133

A central question in the study of quantum many-body systems is the classification of quantum phases of matter, and one of the fundamental quantities for classifying a model's phase is whether or not it has a spectral gap above the ground state energy. In their seminal work, Affleck, Kennedy,... Read more

  • Differential geometry
  • Mathematical Physics
  • Partial Differential Equations

Evan Miller


Finite-time blowup for an Euler and hypodissipative Navier–Stokes model equation on a restricted constraint space

March 14, 2024

ESB 4133

In this talk, I will introduce the restricted Euler and hypodissipative Navier-Stokes equations. These equations are analogous to the Euler and hypodissipative Navier-Stokes equations, respectively, but with the Helmholtz projection replaced by a projection onto a more restrictive constraint... Read more

  • Differential geometry
  • Mathematical Physics
  • Partial Differential Equations

Simone Coccia

UBC
Analogues of the Hilbert Irreducibility Theorem for integral points on surfaces

March 14, 2024

ESB 4133

We will discuss conjectures and results regarding the Hilbert Property, a generalization of Hilbert's irreducibility theorem to arbitrary algebraic varieties. In particular, we will explain how to use conic fibrations to prove the Hilbert Property for the integral points on certain surfaces,... Read more

  • Number Theory

Giulio Tiozzo

University of Toronto
Roots of Alexander polynomials of random positive braids

March 13, 2024

As originally observed experimentally by Dehornoy, roots of Alexander polynomials of random knots display interesting patterns. In this work, joint with N. Dunfield, we prove several results on the distribution of such roots in the complex plane, and discuss further conjectures that originate... Read more

  • Probability

Paul Bressloff

Imperial College London
Single-particle diffusion across a semipermeable membrane

March 13, 2024

ESB 4133

Diffusion through semipermeable interfaces has a wide range of applications, including molecular transport through biological membranes, reverse osmosis, synaptic receptor trafficking, and drug delivery. In this talk I develop a probabilistic model of interfacial diffusion based on snapping out... Read more

  • Mathematical Biology

Kenny Moore

UBC
Plane colorings and arithmetic progressions

March 12, 2024

ESB 4133 (PIMS library)

A conjecture of Erdős, Graham, Montgomery, Rothschild, Spencer and Straus states that, with the exception of equilateral triangles, any two-coloring of the plane will have a monochromatic congruent copy of every three-point configuration. In this presentation, we will discuss the recent proof of... Read more

  • Discrete mathematics

Balazs Elek

UBC
Heaps, Crystals and Preprojective Algebra Modules

March 11, 2024

MATH 126

A Kashiwara crystal is a combinatorial gadget associated to a representation of a reductive algebraic group that enables us to understand the structure of the representation in purely combinatorial terms. We will describe a type-independent combinatorial construction of crystals of the form $B_w... Read more

  • Algebra and Algebraic geometry

Alan Chang

Washington University in St. Louis
Venetian blinds, digital sundials, and efficient coverings

March 11, 2024

ESB 4133 (PIMS library)

Davies's efficient covering theorem states that we can cover any measurable set in the plane by lines without increasing the total measure. This result has a dual formulation, known as Falconer's digital sundial theorem, which states that we can construct a set in the plane to have any desired... Read more

  • Harmonic Analysis and Fractal Geometry