The CompGIT package: a computational tool for Geometric Invariant Theory quotients
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arXiv
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866912448839155712 |
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| author | Hanson, Robert Martinez-Garcia, Jesus |
| author_facet | Hanson, Robert Martinez-Garcia, Jesus |
| contents | We describe CompGIT, a SageMath package to describe Geometric Invariant Theory (GIT) quotients of projective space by simple groups. The implementation is based on algorithms described by Gallardo--Martinez-Garcia--Moon--Swinarski. In principle the package is sufficient to describe any GIT quotient of a projective variety by a simple group -- in practice it requires that the user can construct an equivariant embedding of the polarised variety into projective space. The package describes the non-stable and unstable loci up to conjugation by the group, as well as describing the strictly polystable loci. We discuss potential applications of the outputs of CompGIT to algebraic geometry problems, a well as suggesting directions for future developments. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2506_19431 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The CompGIT package: a computational tool for Geometric Invariant Theory quotients Hanson, Robert Martinez-Garcia, Jesus Algebraic Geometry Computational Geometry Mathematical Software Representation Theory Primary: 14L24, 14-04, Secondary: 14Q99, 68W30, 14J10 We describe CompGIT, a SageMath package to describe Geometric Invariant Theory (GIT) quotients of projective space by simple groups. The implementation is based on algorithms described by Gallardo--Martinez-Garcia--Moon--Swinarski. In principle the package is sufficient to describe any GIT quotient of a projective variety by a simple group -- in practice it requires that the user can construct an equivariant embedding of the polarised variety into projective space. The package describes the non-stable and unstable loci up to conjugation by the group, as well as describing the strictly polystable loci. We discuss potential applications of the outputs of CompGIT to algebraic geometry problems, a well as suggesting directions for future developments. |
| title | The CompGIT package: a computational tool for Geometric Invariant Theory quotients |
| topic | Algebraic Geometry Computational Geometry Mathematical Software Representation Theory Primary: 14L24, 14-04, Secondary: 14Q99, 68W30, 14J10 |
| url | https://arxiv.org/abs/2506.19431 |