%0 Journal Article
%T Adiabatic regularization and preferred vacuum state for the lambda phi^4 field theory in cosmological spacetimes
%A Ferreiro, A.
%A Pla, S.
%J Physical Review D
%D 2022
%V 106
%N 6
%I Amer Physical Soc
%@ 2470-0010
%G English
%F Ferreiro+Pla2022
%O WOS:000862258200010
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=5382), last updated on Mon, 24 Oct 2022 14:28:32 +0000
%X We extend the method of adiabatic regularization by introducing an arbitrary parameter μfor a scalar field with quartic self-coupling in a Friedmann-Lemaitre-Robertson-Walker spacetime at one-loop order. The subtraction terms constructed from this extended version allow us to define a preferred vacuum state at a fixed time ri 1/4 ri0 for this theory. We compute this vacuum state for two commonly used background fields in cosmology, specially in the context of preheating. We also give a possible prescription for an adequate value for mu.
%R 10.1103/PhysRevD.106.065015
%U https://arxiv.org/abs/2206.08200
%U https://doi.org/10.1103/PhysRevD.106.065015
%P 065015-12pp