Classifying log del Pezzo surfaces with torus action
arXiv:2302.03095 · doi:10.1007/s13163-025-00526-8
Abstract
We consider log del Pezzo surfaces coming with a non-trivial torus action. Such a surface is 1/k-log canonical if it allows a resolution of singularities with discrepanies all greater or equal to 1/k-1. We provide a concrete classification algorithm for fixed k and give explicit results for k=1, 2 and 3. This comprises in particular the cases of Gorenstein index 1, 2 and 3.
57 pages