Endoscopic lifts to the Siegel modular threefold related to Klein's cubic threefold

Takeo Okazaki, Takuya Yamauchi

Let $A_{11}^{lev}$ be the moduli space of (1,11)-polarized abelian surfaces with level structure of canonical type. Let $\chi$ be a finite character of order 5 with conductor 11. In t…