Strong q -analogues for values of the Dirichlet beta function

An infinite class of relations between modular forms is constructed that generalizes evaluations of the Dirichlet beta function at odd positive integers. The work is motivated by a base case appearing in Ramanujan’s Notebooks and a parallel construction for the Riemann zeta function. The identities are shown to be strong [Formula: see text]-analogues by virtue of their reduction to the classical beta evaluations as [Formula: see text] and explicit evaluations at CM points for [Formula: see text]. We also determine asymptotic formulas for the Fourier coefficients of the associated modular forms.