%0 Journal Article
%T R-summed form of adiabatic expansions in curved spacetime
%A Ferreiro, A.
%A Navarro-Salas, J.
%A Pla, S.
%J Physical Review D
%D 2020
%V 101
%N 10
%I Amer Physical Soc
%@ 2470-0010
%G English
%F Ferreiro_etal2020
%O WOS:000532656100007
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=4395), last updated on Thu, 28 May 2020 08:11:09 +0000
%X The Feynman propagator in curved spacetime admits an asymptotic (Schwinger-DeWitt) series expansion in derivatives of the metric. Remarkably, all terms in the series containing the Ricci scalar R can be summed exactly. We show that this (nonperturbative) property of the Schwinger-DeWitt series has a natural and equivalent counterpart in the adiabatic (Parker-Fulling) series expansion of the scalar modes in an homogeneous cosmological spacetime. The equivalence between both R-summed adiabatic expansions can be further extended when a background scalar field is also present.
%R 10.1103/PhysRevD.101.105011
%U https://arxiv.org/abs/2003.09610
%U https://doi.org/10.1103/PhysRevD.101.105011
%P 105011-12pp