Oscillating universe in Hořava-Lifshitz gravity
Oscillating universe in Hořava-Lifshitz gravity
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DOI：
10.1103/physrevd.82.064024
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发表时间：
2010-06
影响因子：
5
通讯作者：
K. Maeda;Yosuke Misonoh;Tsutomu Kobayashi
中科院分区：
文献类型：
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作者：
K. Maeda;Yosuke Misonoh;Tsutomu Kobayashi
我们研究了广义Horava-Lifshitz引力下各向同性和均匀宇宙的动力学，并对真空时空的所有可能演化进行了分类。在没有详细的平衡条件的情况下，我们发现各种相结构的真空时空依赖于耦合常数以及空间曲率K和宇宙常数{λ}。当{λ}>0，K={+-}1或{λ}=0，K=-1时，得到了一个反弹宇宙解，而当{λ}>=}0，K=1或{λ}<0，K={+-}1时，得到了一个振荡时空解.我们还提出了从振荡时空到暴胀宇宙的量子隧穿方案，导致宏观循环宇宙。
We study the dynamics of isotropic and homogeneous universes in the generalized Horava-Lifshitz gravity, and classify all possible evolutions of vacuum spacetime. In the case without the detailed balance condition, we find a variety of phase structures of vacuum spacetimes depending on the coupling constants as well as the spatial curvature K and a cosmological constant {Lambda}. A bounce universe solution is obtained for {Lambda}>0, K={+-}1 or {Lambda}=0, K=-1, while an oscillation spacetime is found for {Lambda}{>=}0, K=1, or {Lambda}<0, K={+-}1. We also propose a quantum tunneling scenario from an oscillating spacetime to an inflationary universe, resulting in a macroscopic cyclic universe.