Bounce beyond Horndeski with GR asymptotics and γ-crossing
Bounce beyond Horndeski with GR asymptotics and γ-crossing
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DOI：
10.1088/1475-7516/2018/10/050
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发表时间：
2018-07
影响因子：
6.4
通讯作者：
S. Mironov;V. Rubakov;V. Volkova
中科院分区：
文献类型：
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作者：
S. Mironov;V. Rubakov;V. Volkova
众所周知，超越霍恩代斯基理论承认健康的反弹宇宙学解决方案。然而，迄今为止提出的结构并没有减少到广义相对论（GR）在无限的过去或无限的未来或两者兼而有之。这个障碍就是所谓的γ交叉，它看起来是病态的。通过在幺正规范中工作，我们证实了Ijjas [1]最近的观察，即γ交叉实际上是健康的。在此基础上，我们构造了一个空间平坦、稳定的弹跳宇宙解，其渐近的过去和未来由GR描述，并采用常规的无质量标量场。
It is known that beyond Horndeski theory admits healthy bouncing cosmological solutions. However, the constructions proposed so far do not reduce to General Relativity (GR) in either infinite past or infinite future or both. The obstacle is so called γ-crossing, which off hand appears pathological. By working in the unitary gauge, we confirm the recent observation by Ijjas [1] that γ-crossing is, in fact, healthy. On this basis we construct a spatially flat, stable bouncing Universe solution whose asymptotic past and future are described by GR with conventional massless scalar field.