Linear independence measures for Chowla--Selberg periods

Abstract

We use simultaneous Pad\'e approximations to $_3F_2$ hypergeometric functions to estimate from below linear forms in $1$, $\pi\sqrt d$, $\Omega_D/\pi$ and $\pi/\Omega_D$ with integral coefficients, for certain choices of positive integer $d$ and negative integer $D$, where $\Omega_D$ is (the square of) a Chowla--Selberg period attached to the imaginary quadratic field $Q(\sqrt{D})$.