English

Biregular models of log Del Pezzo surfaces with rigid singularities

Algebraic Geometry 2019-02-14 v2

Abstract

We construct biregular models of families of log Del Pezzo surfaces with rigid cyclic quotient singularities such that a general member in each family is wellformed and quasismooth. Each biregular model consists of infinite series of such families of surfaces; parameterized by the natural numbers N\mathbb{N}. Each family in these models is represented by either a codimension 3 Pfaffian format modelled on the Pl\"ucker embedding of Gr(2,5) or a codimension 4 format modelled on the Segre embedding of P2×P2\mathbb{P}^2 \times \mathbb{P}^2 . In particular, we show the existence of two biregular models in codimension 4 which are bi parameterized, giving rise to an infinite series of models of families of log Del Pezzo surfaces. We identify those models of surfaces which do not admit a Q\mathbb {Q}-Gorenstein deformation to a toric variety.

Keywords

Cite

@article{arxiv.1711.10222,
  title  = {Biregular models of log Del Pezzo surfaces with rigid singularities},
  author = {Muhammad Imran Qureshi},
  journal= {arXiv preprint arXiv:1711.10222},
  year   = {2019}
}

Comments

27 pages, Improved version following referee's comments. To appear in AMS's Math. of Comp