Quantum out-of-equilibrium cosmology Sayantan Choudhury, Arkaprava Mukherjee, Prashali Chauhan and Sandipan Bhattacherjee Eur. Phys. J. C, 79 4 (2019) 320 Published online: 09 April 2019 DOI: 10.1140/epjc/s10052-019-6751-2