25 citations · 135 across the 23 of their papers we have counts for
5 papers · 1 filter
Tunnelling-induced cosmic bounce in the presence of anisotropies
Jean Alexandre, Katy Clough, Silvia Pla
If we imagine rewinding the universe to early times, the scale factor shrinks and the existence of a finite spatial volume may play a role in quantum tunnelling effects in a closed…
Comment on "Gravitational Pair Production and Black Hole Evaporation"
Antonio Ferreiro, Jose Navarro-Salas, Silvia Pla
We scrutinize the recent Letter "Gravitational pair production and black hole evaporation" by M.F. Wondrak, W.D. van Suijlekom and H. Falcke [Phys. Rev. Lett. 130, 221502 (2023); a…
Instantaneous vacuum and States of Low Energy for a scalar field in cosmological backgrounds
Antonio Ferreiro, Silvia Pla
We construct the instantaneous vacuum state for a quantum scalar field coupled to another classical scalar field as described in [1]. We then compare it with the state of low energ…
Low Energy States and CPT invariance at the Big Bang
Sergi Nadal-Gisbert, José Navarro-Salas, Silvia Pla
In this paper, we analyze the quantum vacuum in a radiation-dominated and CPT-invariant universe by further imposing the quantum states to be ultraviolet regular i.e., satisfying t…
Cosmic bounce and phantom-like equation of state from tunnelling
Jean Alexandre, Silvia Pla
We allow a scalar field on a flat FLRW background metric to tunnel between two degenerate vacua. The resulting true vacuum state then violates the Null Energy Condition, and the co…