11 citations · 24 across the 12 of their papers we have counts for
6 papers · 1 filter
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…
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…
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…
Renormalization and decoupling for the Yukawa model in curved spacetime
Sergi Nadal-Gisbert, Antonio Ferreiro, José Navarro-Salas
We consider the renormalization of the one-loop effective action for the Yukawa interaction. We compute the beta functions in the generalized DeWitt-Schwinger subtraction scheme. F…
Renormalization, running couplings and decoupling for the Yukawa model in curved spacetime
Antonio Ferreiro, Sergi Nadal-Gisbert, José Navarro-Salas
The decoupling of heavy fields as required by the Appelquist-Carazzone theorem plays a fundamental role in the construction of any effective field theory. However, it is not a triv…
Note on the pragmatic mode-sum regularization method: translational-splitting in a cosmological background
Pau Beltrán-Palau, Adrián del Río, Sergi Nadal-Gisbert +1
The point-splitting renormalization method offers a prescription to calculate finite expectation values of quadratic operators constructed from quantum fields in a general curved s…