The non-adiabatic pressure in general scalar field systems

被引：71
|
作者：
Christopherson, Adam J. [1 ]
Malik, Karim A. [1 ]
机构：
[1] Queen Mary Univ London, Astron Unit, Sch Math Sci, London E1 4NS, England
来源：
PHYSICS LETTERS B | 2009年 / 675卷 / 02期
基金：
英国科学技术设施理事会;
关键词：
Scalar fields in cosmology; Non-adiabatic pressure; Sound speed; PERTURBATIONS; EVOLUTION;
D O I：
10.1016/j.physletb.2009.04.003
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We discuss the non-adiabatic or entropy perturbation, which controls the evolution Of the Curvature perturbation in the uniform density gauge, for a scalar field system minimally coupled to gravity with non-canonical action. We highlight the differences between the sound and the phase speed in these systems. and show that the non-adiabatic pressure perturbation vanishes in the single field case, resulting in the conservation Of the Curvature perturbation oil large scales. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码：159 / 163
页数：5
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