English

Finite quotients of powers of an elliptic curve

Algebraic Geometry 2020-06-24 v3 Quantum Algebra Rings and Algebras Representation Theory

Abstract

Let EE be an elliptic curve. When the symmetric group Σg+1\Sigma_{g+1} of order (g+1)!(g+1)! acts on Eg+1E^{g+1} in the natural way, the subgroup E0g+1E_0^{g+1}, consisting of those (g+1)(g+1)-tuples whose coordinates sum to zero, is stable under the action of Σg+1\Sigma_{g+1}. It is isomorphic to EgE^g. This paper concerns the structure of the quotient variety Eg/ΣE^g/\Sigma when Σ\Sigma is a subgroup of Σg+1\Sigma_{g+1} generated by simple transpositions. In an earlier paper we observed that Eg/ΣE^g/\Sigma is a bundle over a suitable power, ENE^N, with fibers that are products of projective spaces. This paper shows that Eg/ΣE^g/\Sigma has an \'etale cover by a product of copies of EE and projective spaces with an abelian Galois group.

Keywords

Cite

@article{arxiv.1905.06710,
  title  = {Finite quotients of powers of an elliptic curve},
  author = {Alex Chirvasitu and Ryo Kanda and S. Paul Smith},
  journal= {arXiv preprint arXiv:1905.06710},
  year   = {2020}
}

Comments

8 pages + references; number of changes + updated cross-references to other papers in the same series