Euler characteristic and cohomology of ${\mathrm{Sp}}_4(\mathbb{Z})$ with nontrivial coefficients

Jitendra Bajpai, Ivan Horozov, Matias Moya Giusti

In this article, the cohomology of the arithmetic group ${\mathrm{Sp}}_4(\mathbb{Z})$ with coefficients in any finite dimensional highest weight representation ${\mathcal{M}}_{\lambda }$ have b…