The Harris-Venkatesh conjecture for derived Hecke operators III: local constants

Abstract

The first two papers in this series prove the Harris-Venkatesh conjecture on derived Hecke operators and its refinement with the Stark conjecture for imaginary dihedral modular forms of weight $1$. This paper explicitly describes the constants appearing in the Harris-Venkatesh conjecture for dihedral modular forms by evaluating $\mathrm{GL}(2)\times \mathrm{GL}(2)$ Rankin-Selberg periods and zeta integrals on newforms and optimal forms. One consequence is a formula for the ratio between Petersson norms and adjoint $L$-values. These calculations also extend to exotic modular forms of odd level and to exotic modular forms with $2$-ordinary Deligne-Serre representation.

arXiv comment48 pages. Expanded details, typo fixes, and results renumbered. Sequel to arXiv:2301.00570 and arXiv:2305.08956