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# Events for 11/11/2019 from all calendars

## Working Seminar on Quantum Computation and Quantum Information

## Working Seminar in Groups, Dynamics, and Operator Algebras

## Geometry Seminar

## Frontiers in Mathematics Lecture Series

## AMUSE

**Time:** 12:30PM - 1:45PM

**Location:** BLOC 624

**Speaker:** Li Gao, TAMU

**Title:** *Quantum Brascamp-Lieb Inequalities*

**Time:** 2:00PM - 3:00PM

**Location:** BLOC 624

**Speaker:** Alexander Weygandt, Texas A&M University

**Title:** *From weakly nuclear splittings to nuclearity*

**Time:** 3:00PM - 4:00PM

**Location:** BLOC 628

**Speaker:** M. Michalek, MPI Leipzig

**Title:** *Singularities of secant and tangential varieties of Segre-Veronese varieties*

**Abstract:** We will show applications of ideas from statistics to study classical objects in algebraic geometry. A change of coordinates, inspired by computation of cumulants, reveals a toric structure on secant variety of any Segre-Veronese variety. We will show how to exploit this structure to study the singularities.

**Time:** 4:00PM - 5:00PM

**Location:** Blocker 117

**Speaker:** Mikhail Gromov, Courant Institute and IHES

**Title:** *"What are Live Structures and what kind of Mathematics can account for them?"*

**Time:** 6:00PM - 7:00PM

**Location:** BLOC 220

**Speaker:** Gregory Berkolaiko, Dept of Mathematics, Texas A&M University

**Title:** *Diabolical points and where to find them*

**Abstract:** Wave propagation through periodic medium (such as a crystal or a layered material) is described by dispersion relation, which in most practical computations is a plot of eigenvalues of a matrix which depends on several parameters. Gaps in the dispersion relation correspond to wave frequencies that do not propagate through the material. Diabolical points refer to a special feature in the dispersion relation, a location where two eigenvalues collide. Those are special because a small perturbation of the medium (for example, by a external magnetic field) can create a new gap and thereby turn a conductor into an insulator. We describe the idea behind a numerical algorithm we designed to locate diabolical points for a parametric family of real symmetric matrices. Based on an undergraduate research project of Advait Parulekar.

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