Equilibration of a quantum field in de Sitter space-time

被引：6

作者：

Albrecht, Andreas ^{[1
]}

Holman, R. ^{[2
]}

Richard, Benoit J. ^{[1
]}

机构：

[1] Univ Calif Davis, Dept Phys, Davis, CA 95616 USA

[2] Carnegie Mellon Univ, Dept Phys, Pittsburgh, PA 15213 USA

来源：

PHYSICAL REVIEW D | 2015年 / 91卷 / 04期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevD.91.043517

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We address the following question: To what extent can a quantum field tell if it has been placed in de Sitter space? Our approach is to use the techniques of nonequilibrium quantum field theory to compute the time evolution of a state which starts off in flat space for (conformal) times eta < eta(0) and then evolves in a de Sitter background turned on instantaneously at eta = eta(0). We find that the answer depends on what quantities one examines. We study a range of them, all based on two-point correlation functions, and analyze which ones approach the standard Bunch-Davies values over time. The outcome of this analysis suggests that the nature of the equilibration process in this system is similar to that in more familiar systems.

引用

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