Siegel modular forms of genus 2 and level 2: cohomological computations and conjectures

Jonas Bergström, Carel Faber, Gerard van der Geer

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

We study the cohomology of certain local systems on moduli spaces of principally polarized abelian surfaces with a level 2 structure. The trace of Frobenius on the alternating sum of the étale cohomology groups of these local systems can be calculated by counting the number of pointed curves of genus 2 with a prescribed number of Weierstrass points over the given finite field. This cohomology is intimately related to vector-valued Siegel modular forms. The corresponding scheme in level 1 was carried out in [FvdG]. Here we extend this to level 2 where new phenomena appear. We determine the contribution of the Eisenstein cohomology together with its S_6-action for the full level 2 structure and on the basis of our computations we make precise conjectures on the endoscopic contribution. We also make a prediction about the existence of a vector-valued analogue of the Saito-Kurokawa lift. Assuming these conjectures that are based on ample numerical evidence, we obtain the traces of the Hecke-operators T(p) for p <41 on the remaining spaces of `genuine' Siegel modular forms. We present a number of examples of 1-dimensional spaces of eigenforms where these traces coincide with the Hecke eigenvalues. We hope that the experts on lifting and on endoscopy will be able to prove our conjectures.
Original languageEnglish
JournalInternational Mathematics Research Notices
Publication statusPublished - 2008

Keywords

  • Mathematics - Algebraic Geometry
  • Mathematics - Number Theory
  • 11F46
  • 11G18
  • 14G35
  • 14J15
  • 20B25

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