Deformations of singularities and variation of GIT quotients

Details Deformations of singularities and variation of GIT quotients Deformations of singularities and variation of GIT quotients

Publishing date

2006-06-30

URL

arxiv.org/abs/math/0607003v2

Journals

Trans. Amer. Math. Soc. 361 (2009), no. 4, 2109-2161

Science

Mathematics

Field

Algebraic Geometry

Additional info

52 pages, revised version

Type

Scientific paper

Abstract

We study the deformations of the minimally elliptic surface singularity $N_{16}$. A standard argument reduces the study of the deformations of $N_{16}$ to the study of the moduli space of pairs $(C,L)$ consisting of a plane quintic curve and a line. We construct this moduli space in two ways: via the periods of $K3$ surfaces and by using geometric invariant theory (GIT). The GIT construction depends on the choice of the linearization. In particular, for one choice of linearization we recover the space constructed via $K3$ surfaces and for another we obtain the full deformation space of $N_{16}$. The two spaces are related by a series of explicit flips. In conclusion, by using the flexibility given by GIT and the standard tools of Hodge theory, we obtain a good understanding of the deformations of $N_{16}$.

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