Cosmological analogies, Lagrangians, and symmetries for convective–radiative heat transfer Valerio Faraoni, Farah Atieh and Steve Dussault Eur. Phys. J. C, 80 8 (2020) 706 Published online: 06 August 2020 DOI: 10.1140/epjc/s10052-020-8292-0