Schütt, Matthias - Q_l-cohomology projective planes and singular Enriques surfaces in characteristic two

epiga:3990 - Épijournal de Géométrie Algébrique, June 26, 2019, Volume 3
Q_l-cohomology projective planes and singular Enriques surfaces in characteristic two

Authors: Schütt, Matthias

We classify singular Enriques surfaces in characteristic two supporting a rank nine configuration of smooth rational curves. They come in one-dimensional families defined over the prime field, paralleling the situation in other characteristics, but featuring novel aspects. Contracting the given rational curves, one can derive algebraic surfaces with isolated ADE-singularities and trivial canonical bundle whose Q_l-cohomology equals that of a projective plane. Similar existence results are developed for classical Enriques surfaces. We also work out an application to integral models of Enriques surfaces (and K3 surfaces).


Source : oai:arXiv.org:1703.10441
Volume: Volume 3
Published on: June 26, 2019
Submitted on: October 12, 2017
Keywords: Mathematics - Algebraic Geometry,Mathematics - Number Theory,14J28, 14J27


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