Global +- regularity

Kevin Tucker (University of Illinois at Chicago)

01-Apr-2021, 20:30-22:00 (3 years ago)

Abstract: Over a field of characteristic $p > 0$, a globally F-regular algebraic variety is a special type of Frobenius split variety. They are necessarily locally (strongly) F-regular, hence normal and Cohen-Macaulay, but also satisfy a number of particularly nice global properties as well. A smooth projective variety is globally F-regular if its (normalized) coordinate rings are F-regular, a condition which imposes strong positivity properties and implies Kodaira-type vanishing results. Globally F-regular varieties are closely related to complex log Fano varieties via reduction to characteristic $p > 0$.

In this talk, I will describe an analog of global F-regularity in the mixed characteristic setting called global +-regularity and introduce certain stable sections of adjoint line bundles. This is inspired by recent work of Bhatt on the Cohen-Macaulayness of the absolute integral closure, and has applications to birational geometry in mixed characteristic. This is based on arXiv:2012.15801 and is joint work with Bhargav Bhatt, Linquan Ma, Zsolt Patakfalvi, Karl Schwede, Joe Waldron, and Jakub Witaszek.

commutative algebra

Audience: researchers in the topic

( paper )


Fellowship of the Ring

Series comments: Description: National Commutative Algebra Seminar

You have to register to attend the seminar; the registration link is on the webpage. But you only have to register once. Once you register for a seminar, your registration will be carried over (in theory!) to future seminars.

Organizers: Srikanth B. Iyengar*, Karl E. Schwede
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