Cosmological aspects of hydrodynamic treatment of the Einstein–Vlasov equations Victor V. Vedenyapin, Nikolay N. Fimin and Valery M. Chechetkin Eur. Phys. J. Plus, 137 9 (2022) 1022 Published online: 08 September 2022 DOI: 10.1140/epjp/s13360-022-03257-7