Papers › Computation of GIT quotients of semisimple groups

Computation of GIT quotients of semisimple groups

15 Aug 2023arXiv:2308.08049links table onlyarchive 2025-07-28

Patricio Gallardo, Jesus Martinez-Garcia, Han-Bom Moon, David Swinarski

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We describe three algorithms to determine the stable, semistable, and torus-polystable loci of the GIT quotient of a projective variety by a reductive group. The algorithms are efficient when the group is semisimple. By using an implementation of our algorithms for simple groups, we provide several applications to the moduli theory of algebraic varieties, including the K-moduli of algebraic varieties, the moduli of algebraic curves and the Mukai models of the moduli space of curves for low genus. We also discuss a number of potential improvements and some natural open problems arising from this work.

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