Deformations of singularities and variation of GIT quotients

Laza, Radu

doi:10.1090/S0002-9947-08-04660-6

Deformations of singularities and variation of GIT quotients

Author: Radu Laza
Journal: Trans. Amer. Math. Soc. 361 (2009), 2109-2161
MSC (2000): Primary 14J17, 14B07, 32S25; Secondary 14L24
DOI: https://doi.org/10.1090/S0002-9947-08-04660-6
Published electronically: November 12, 2008
MathSciNet review: 2465831
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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 consisting of a plane quintic curve and a line. We construct this moduli space in two ways: via the periods of 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 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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