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gr-qc2022
Renormalization and a non-adiabatic vacuum choice in a radiation-dominated universe
Pau Beltrán-Palau, Sergi Nadal-Gisbert, José Navarro-Salas +1
Vacuum and particles can be naturally defined in the adiabatic regime of an expanding universe. In general, however, there is no preferred choice of a vacuum state, unless the spac…
gr-qc2022
Hadamard and boundary conditions for the Big Bang quantum vacuum
Pau Beltrán-Palau, Sergi Nadal-Gisbert, José Navarro-Salas +1
General relativity predicts final-type singularities inside black holes, as well as a cosmological initial-type singularity. Cosmic censorship protects external observers from blac…