Siegel modular forms of degree three and the cohomology of local systems
By Jonas Bergström, Carel Faber, Gerard van der Geer. 2011
71 citations recorded by the source corpus.
We give an explicit conjectural formula for the motivic Euler characteristic of an arbitrary symplectic local system on the moduli space $$\mathcal{A }_3$$ of principally polarized abelian threefolds. The main term of the formula is a conjectural motive of Siegel modular forms of a certain type; the remaining terms admit a surprisingly simple description in terms of the motivic Euler characteristics for lower genera. The conjecture is based on extensive counts of curves of genus three and abelian threefolds over finite fields. It provides a lot of new information about vector-valued Siegel modular forms of degree three, such as dimension formulas and traces of Hecke operators. We also use it to predict several lifts from genus 1 to genus 3, as well as lifts from $$\mathrm{G }_2$$ and new congruences of Harder type.
Subfields: Geometry and Topology, Mathematical Physics
View Paper: https://www.semanticscholar.org/paper/f2a809d2c2f6fef809d8ca5e922d42a3aec3acae
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In Geometry and Topology
In Mathematical Physics
Citations in the corpus
- Cohomology of local systems on the moduli of principally polarized abelian surfaces (2013, background): “See also [Bergström, Faber, and van der Geer 2014, Section 6] for a more detailed description.”