TY  - JOUR
AU  - Beltran-Palau, P.
AU  - del Rio, A.
AU  - Nadal-Gisbert, S.
AU  - Navarro-Salas, J.
PY  - 2021
DA  - 2021//
TI  - Note on the pragmatic mode-sum regularization method: Translational-splitting in a cosmological background
T2  - Phys. Rev. D
JO  - Physical Review D
SP  - 105002
EP  - 9pp
VL  - 103
IS  - 10
PB  - Amer Physical Soc
AB  - The point-splitting renormalization method offers a prescription to calculate finite expectation values of quadratic operators constructed from quantum fields in a general curved spacetime. It has been recently shown by Levi and Ori that when the background metric possesses an isometry, like stationary or spherically symmetric black holes, the method can be upgraded into a pragmatic procedure of renormalization that produces efficient numerical calculations. In this paper we show that when the background enjoys three-dimensional spatial symmetries, like homogeneous expanding universes, the above pragmatic regularization technique reduces to the well-established adiabatic regularization method.
SN  - 2470-0010
UR  - https://arxiv.org/abs/2103.17218
UR  - https://doi.org/10.1103/PhysRevD.103.105002
DO  - 10.1103/PhysRevD.103.105002
LA  - English
N1  - WOS:000655874400009
ID  - Beltran-Palau_etal2021
ER  -