R-summed form of adiabatic expansions in curved spacetime

被引：6
作者：
Ferreiro, Antonio [1 ,2 ]
Navarro-Salas, Jose [1 ,2 ]
Pla, Silvia [1 ,2 ]
机构：
[1] Univ Valencia, CSIC, Fac Fis, Ctr Mixto,Dept Fis Teor, Valencia 46100, Spain
[2] Univ Valencia, CSIC, Fac Fis, Ctr Mixto,IFIC, Valencia 46100, Spain
来源：
PHYSICAL REVIEW D | 2020年 / 101卷 / 10期
关键词：
ENERGY-MOMENTUM TENSOR; FEYNMAN PROPAGATOR; HEAT KERNEL; COVARIANT TECHNIQUE; REGULARIZATION; FIELD;
D O I：
10.1103/PhysRevD.101.105011
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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.
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页数：12
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