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# JANUARY 26, 2023

SPEAKER:   Payman Eskandari, Assistant Professor, University of Winnipeg, Department of Mathematics and Statistics

TITLE:   "Periods in Number Theory and Algebraic Geometry"

ABSTRACT:   Periods are numbers that arise as integrals of rational functions with coefficients in $\mathbb{Q}$ over sets that are cut out by polynomial inequalities with coefficients in $\mathbb{Q}$. 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 $\mathbb{Q}$.

Examples of periods include algebraic numbers, $\pi$, $\log(2)$ 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).

TIME:  All in the Central Time Zone

• Meet and Greet:  2:00pm-2:30pm​

• Talk:  2:30pm-3:20pm

• Questions:  3:20pm-3:30pm

LOCATION:  The event will take place via Zoom.

MEETING ID: 926 2224 0845

PASSCODE: 37641920

January 26, 2023: ScheduleItem
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