4 papers
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…
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…