Adiabatic perturbations in pre-big bang models: Matching conditions and scale invariance
Adiabatic perturbations in pre-big bang models: Matching conditions and scale invariance
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DOI：
10.1103/physrevd.66.083503
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发表时间：
2002-03
影响因子：
5
通讯作者：
R. Durrer;Filippo Vernizzi
中科院分区：
文献类型：
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作者：
R. Durrer;Filippo Vernizzi
在低能量下，宇宙的ekpyrotic模型的四维有效作用量相当于大爆炸前模型的一个稍微修改的版本。我们讨论这些模型中的宇宙学扰动。特别是，我们解决的问题，从一个崩溃的扩展阶段完全一般性的扰动匹配。我们表明，一般来说，一个获得
At low energy, the four-dimensional effective action of the ekpyrotic model of the universe is equivalent to a slightly modified version of the pre big bang model. We discuss cosmological perturbations in these models. In particular we address the issue of matching the perturbations from a collapsing to an expanding phase in full generality. We show that, generically, one obtains