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arxiv: 1711.10222 · v2 · pith:EM7U2BS4new · submitted 2017-11-28 · 🧮 math.AG

Biregular models of log Del Pezzo surfaces with rigid singularities

classification 🧮 math.AG
keywords modelssurfacesbiregularmathbbcodimensionfamiliespezzoembedding
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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 $\mathbb{N}$. 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 \(\mathbb{P}^2 \times \mathbb{P}^2 \). 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 \(\mathbb {Q}\)-Gorenstein deformation to a toric variety.

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