Multigraded Hilbert series of invariants, covariants, and symplectic quotients for some rank $1$ Lie groups
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arXiv
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| Format: | Preprint |
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2022
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| author | Barringer, Austin Herbig, Hans-Christian Herden, Daniel Khalid, Saad Seaton, Christopher Walker, Lawton |
| author_facet | Barringer, Austin Herbig, Hans-Christian Herden, Daniel Khalid, Saad Seaton, Christopher Walker, Lawton |
| contents | We compute univariate and multigraded Hilbert series of invariants and covariants of representations of the circle and orthogonal group $\operatorname{O}_2$. The multigradings considered include the maximal grading associated to the decomposition of the representation into irreducibles as well as the bigrading associated to a cotangent-lifted representation, or equivalently, the bigrading associated to the holomorphic and antiholomorphic parts of the real invariants and covariants. This bigrading induces a bigrading on the algebra of on-shell invariants of the symplectic quotient, and the corresponding Hilbert series are computed as well. We also compute the first few Laurent coefficients of the univariate Hilbert series, give sample calculations of the multigraded Laurent coefficients, and give an example to illustrate the extension of these techniques to the semidirect product of the circle by other finite groups. We describe an algorithm to compute each of the associated Hilbert series. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2201_10414 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Multigraded Hilbert series of invariants, covariants, and symplectic quotients for some rank $1$ Lie groups Barringer, Austin Herbig, Hans-Christian Herden, Daniel Khalid, Saad Seaton, Christopher Walker, Lawton Rings and Algebras Commutative Algebra Symplectic Geometry Primary 13A50, Secondary 05A15, 14L30, 53D20 We compute univariate and multigraded Hilbert series of invariants and covariants of representations of the circle and orthogonal group $\operatorname{O}_2$. The multigradings considered include the maximal grading associated to the decomposition of the representation into irreducibles as well as the bigrading associated to a cotangent-lifted representation, or equivalently, the bigrading associated to the holomorphic and antiholomorphic parts of the real invariants and covariants. This bigrading induces a bigrading on the algebra of on-shell invariants of the symplectic quotient, and the corresponding Hilbert series are computed as well. We also compute the first few Laurent coefficients of the univariate Hilbert series, give sample calculations of the multigraded Laurent coefficients, and give an example to illustrate the extension of these techniques to the semidirect product of the circle by other finite groups. We describe an algorithm to compute each of the associated Hilbert series. |
| title | Multigraded Hilbert series of invariants, covariants, and symplectic quotients for some rank $1$ Lie groups |
| topic | Rings and Algebras Commutative Algebra Symplectic Geometry Primary 13A50, Secondary 05A15, 14L30, 53D20 |
| url | https://arxiv.org/abs/2201.10414 |