Dicke superradiance, Bose-Einstein condensation of photons and spontaneous symmetry breaking Vivek M. Vyas, Prasanta K. Panigrahi and V. Srinivasan Eur. Phys. J. Plus, 137 7 (2022) 815 Published online: 15 July 2022 DOI: 10.1140/epjp/s13360-022-03047-1