The non-adiabatic pressure in general scalar field systems
The non-adiabatic pressure in general scalar field systems
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DOI：
10.1016/j.physletb.2009.04.003
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发表时间：
2008-09
影响因子：
4.4
通讯作者：
Adam J. Christopherson;Karim A. Malik
中科院分区：
文献类型：
--
作者：
Adam J. Christopherson;Karim A. Malik
本文讨论了具有非正则作用量的与引力最小耦合的标量场系统的非绝热或熵微扰，它控制着均匀密度规范中曲率微扰的演化。我们强调在这些系统中的声音和相速度之间的差异，并表明，在单场的情况下，非绝热压力扰动消失，导致在大尺度上的曲率扰动的守恒。
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 on large scales.