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Maps from Feigin and Odesskii's elliptic algebras to twisted homogeneous coordinate rings

Part of: Algebraic geometry: Foundations Rings and algebras with additional structure Rings and algebras arising under various constructions Curves

Published online by Cambridge University Press:  11 January 2021

Alex Chirvasitu ,
Ryo Kanda Open the ORCID record for Ryo Kanda [Opens in a new window]  and
S. Paul Smith
Alex Chirvasitu
Affiliation:
Department of Mathematics, University at Buffalo, Buffalo, NY14260-2900, USA; E-mail: achirvas@buffalo.edu.
Ryo Kanda
Affiliation:
Department of Mathematics, Graduate School of Science, Osaka City University, 3-3-138, Sugimoto, Sumiyoshi, Osaka, 558-8585, Japan; E-mail: ryo.kanda.math@gmail.com.
S. Paul Smith
Affiliation:
Department of Mathematics, Box 354350, University of Washington, Seattle, WA98195, USA; E-mail: smith@math.washington.edu.

Abstract

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The elliptic algebras in the title are connected graded $\mathbb {C}$-algebras, denoted $Q_{n,k}(E,\tau )$, depending on a pair of relatively prime integers $n>k\ge 1$, an elliptic curve E and a point $\tau \in E$. This paper examines a canonical homomorphism from $Q_{n,k}(E,\tau )$ to the twisted homogeneous coordinate ring $B(X_{n/k},\sigma ',\mathcal {L}^{\prime }_{n/k})$ on the characteristic variety $X_{n/k}$ for $Q_{n,k}(E,\tau )$. When $X_{n/k}$ is isomorphic to $E^g$ or the symmetric power $S^gE$, we show that the homomorphism $Q_{n,k}(E,\tau ) \to B(X_{n/k},\sigma ',\mathcal {L}^{\prime }_{n/k})$ is surjective, the relations for $B(X_{n/k},\sigma ',\mathcal {L}^{\prime }_{n/k})$ are generated in degrees $\le 3$ and the noncommutative scheme $\mathrm {Proj}_{nc}(Q_{n,k}(E,\tau ))$ has a closed subvariety that is isomorphic to $E^g$ or $S^gE$, respectively. When $X_{n/k}=E^g$ and $\tau =0$, the results about $B(X_{n/k},\sigma ',\mathcal {L}^{\prime }_{n/k})$ show that the morphism $\Phi _{|\mathcal {L}_{n/k}|}:E^g \to \mathbb {P}^{n-1}$ embeds $E^g$ as a projectively normal subvariety that is a scheme-theoretic intersection of quadric and cubic hypersurfaces.

Keywords

Elliptic algebraSklyanin algebratwisted homogeneous coordinate ringcharacteristic variety

MSC classification

Primary: 14A22: Noncommutative algebraic geometry
Secondary: 16S38: Rings arising from non-commutative algebraic geometry 16W50: Graded rings and modules 14H52: Elliptic curves
Type
Algebra
Information
Forum of Mathematics, Sigma , Volume 9 , 2021 , e4
Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
© The Author(s), 2020. Published by Cambridge University Press

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