Study explores possibility that dark photons could be a heat source for intergalactic gas
(Top panel) Fit to Doppler parameter distribution and Lyman-alpha forest column density distribution function at z=0.1 assuming a maximum contribution of dark photon heating to linewidths. The contours show the projection of the 68% and 95% intervals for the mass and the mixing parameter of the dark photon. Colors correspond to different assumptions about the …