Hydrodynamic description of direct photon spectrum and elliptic flow in Pb + Pb collisions at LHC Sándor Lökös and Gábor Kasza Eur. Phys. J. A, 61 7 (2025) 157 Published online: 11 July 2025 DOI: 10.1140/epja/s10050-025-01625-2