@Article{Ferreiro_etal2020,
author="Ferreiro, A.
and Navarro-Salas, J.
and Pla, S.",
title="R-summed form of adiabatic expansions in curved spacetime",
journal="Physical Review D",
year="2020",
publisher="Amer Physical Soc",
volume="101",
number="10",
pages="105011--12pp",
abstract="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.",
optnote="WOS:000532656100007",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=4395), last updated on Thu, 28 May 2020 08:11:09 +0000",
issn="2470-0010",
doi="10.1103/PhysRevD.101.105011",
opturl="https://arxiv.org/abs/2003.09610",
opturl="https://doi.org/10.1103/PhysRevD.101.105011",
language="English"
}