Computing Hilbert modular forms over fields with nontrivial class group

  • Authors:
  • Lassina Dembélé;Steve Donnelly

  • Affiliations:
  • Institut für Experimentelle Mathematik, Essen, Germany;School of Mathematics and Statistics, University of Sydney, NSW, Sydney, Australia

  • Venue:
  • ANTS-VIII'08 Proceedings of the 8th international conference on Algorithmic number theory
  • Year:
  • 2008

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Abstract

We exhibit an algorithm for the computation of Hilbert modularforms over an arbitrary totally real number field of even degree,extending results of the first author. We present some new instancesof the conjectural Eichler-Shimura construction for totally real numberfields over the fields Q(√10) and Q(√85) and their Hilbert class fields,and in particular some new examples of modular abelian varieties witheverywhere good reduction over those fields.