For Feigin-Odesskii elliptic algebras whose characteristic variety is a product or symmetric product of an elliptic curve, the canonical map to the twisted homogeneous coordinate ring is surjective and its relations are generated in degrees at most three.
Finite quotients of powers of an elliptic curve
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abstract
Let $E$ be an elliptic curve. When the symmetric group $\Sigma_{g+1}$ of order $(g+1)!$ acts on $E^{g+1}$ in the natural way, the subgroup $E_0^{g+1}$, consisting of those $(g+1)$-tuples whose coordinates sum to zero, is stable under the action of $\Sigma_{g+1}$. It is isomorphic to $E^g$. This paper concerns the structure of the quotient variety $E^g/\Sigma$ when $\Sigma$ is a subgroup of $\Sigma_{g+1}$ generated by simple transpositions. In an earlier paper we observed that $E^g/\Sigma$ is a bundle over a suitable power, $E^N$, with fibers that are products of projective spaces. This paper shows that $E^g/\Sigma$ has an \'etale cover by a product of copies of $E$ and projective spaces with an abelian Galois group.
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math.AG 1years
2019 1verdicts
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Maps from Feigin and Odesskii's elliptic algebras to twisted homogeneous coordinate rings
For Feigin-Odesskii elliptic algebras whose characteristic variety is a product or symmetric product of an elliptic curve, the canonical map to the twisted homogeneous coordinate ring is surjective and its relations are generated in degrees at most three.