## Prairie Mathematics Colloquium: Payman Eskandari

- Date: 01/26/2023
- Time: 14:30

University of Regina

Periods in number theory and algebraic geometry

Periods are numbers that arise as integrals of rational functions with coefficients in Q over sets that are cut out by polynomial inequalities with coefficients in Q. More conceptually, periods are numbers that arise from the natural isomorphism between the singular and algebraic de Rham cohomologies of algebraic varieties (or more generally, singular and de Rham realizations of motives) over Q.

Examples of periods include algebraic numbers, π, log(2) and other special values of the logarithm function, and special values of the Riemann zeta function (or more generally, multiple zeta values). It is expected that every algebraic relation between periods should "come from geometry": this is the moral of Grothendieck's period conjecture, a very deep and fascinating conjecture of Grothendieck that connects number theory with geometry.

The goal of this talk is to give an introduction to periods and Grothendieck's period conjecture. In the final part of the talk we will describe some recent related work (joint with K. Murty).

This event is part of the Prairie Mathematics Colloquium.

**Location**: Live Stream. Join with Zoom link.

More details listed here.

**Time**: Social tea break at __2pm Central__, Talk at __2.30pm Central__.