Back to Algebraic Geometry Seminar: Spring 2013
Algebraic Geometry Seminar
Date: Tuesday, Jan 22, 2013
Time: 3:30PM - 4:30PM
Location: LCB 215
Zachary Maddock
Columbia University
Title |
Regular del Pezzo surfaces with irregularity |
Abstract |
Over perfect fields, the geometry of regular del Pezzo surfaces has been classified, but over imperfect fields, the problem remains largely open. We construct the first examples of regular del Pezzo surfaces X that have positive irregularity h^1(X, O_X ) > 0. Our construction is by quotienting a regular, quasi-linear surface (i.e. a regular variety that is geometrically a non-reduced first-order neighborhood of a plane) by explicit rank 1 foliations. We also find a restriction on the integer pairs that are possible as the anti-canonical degree and irregularity of such surfaces. |
Algebraic Geometry