Combining general relativity, massive QED and Very Long Baseline Interferometry to gravitationally constrain the photon mass

A constraint between the photon mass and the parameters γ (the deflection parameter determined by experimentalists) and ν (the photon frequency) is found by judiciously combining General Relativity and Massive QED. By adopting this scenario and by considering as inputs the most recent measurements of the solar gravitational deflection of radio waves obtained by means of the Very Long Baseline Interferometry, gravitational upper bounds on the photon mass are estimated.