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Licensed Unlicensed Requires Authentication Published by De Gruyter July 6, 2009

Prym-Tyurin varieties via Hecke algebras

  • Angel Carocca , Herbert Lange , Rubí E. Rodríguez and Anita M. Rojas


Let G denote a finite group and π : ZY a Galois covering of smooth projective curves with Galois group G. For every subgroup H of G there is a canonical action of the corresponding Hecke algebra ℚ[H\G/H] on the Jacobian of the curve X = Z/H. To each rational irreducible representation 𝒲 of G we associate an idempotent in the Hecke algebra, which induces a correspondence of the curve X and thus an abelian subvariety P of the Jacobian JX. We give sufficient conditions on 𝒲, H, and the action of G on Z for P to be a Prym-Tyurin variety. We obtain many new families of Prym-Tyurin varieties of arbitrary exponent in this way.

Received: 2007-11-21
Revised: 2008-06-12
Published Online: 2009-07-06
Published in Print: 2009-September

© Walter de Gruyter Berlin · New York 2009

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