A covariant Lagrangian for stable nonsingular bounce
A covariant Lagrangian for stable nonsingular bounce
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用于稳定非奇异弹跳的协变拉格朗日
DOI：
10.1007/jhep09(2017)027
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发表时间：
2017-09-07
影响因子：
5.4
通讯作者：
Piao, Yun-Song
中科院分区：
文献类型：
--
作者：
Cai, Yong;Piao, Yun-Song
最近的研究证明，非奇异的反弹模型通常存在鬼波或梯度不稳定性。本文提出了一个稳定非奇异反弹的协变有效理论，它具有场的二阶导数的二次阶，但背景仅由P（λ，X）构成。有了它，我们明确地构建了一个完全稳定的非奇异反弹模型的ekpyrotic方案。
The nonsingular bounce models usually suffer from the ghost or gradient instabilities, as has been proved recently. In this paper, we propose a covariant effective theory for stable nonsingular bounce, which has the quadratic order of the second order derivative of the field ϕ but the background set only by P (ϕ, X). With it, we explicitly construct a fully stable nonsingular bounce model for the ekpyrotic scenario.