Primordial Perturbation in Horava-Lifshitz Cosmology
Primordial Perturbation in Horava-Lifshitz Cosmology
复制标题
Horava-Lifshitz 宇宙学中的原初微扰
DOI：
10.1016/j.physletb.2009.09.047
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发表时间：
2009-04
影响因子：
4.4
通讯作者：
Piao YS
中科院分区：
文献类型：
--
作者：
Piao YS
Recently, Hořava has proposed a renormalizable theory of gravity with critical exponent z=3 in the UV. This proposal might imply that the scale invariant primordial perturbation can be generated in any expansion of early universe with a∼tnand n>1/3, which, in this Letter, will be confirmed by solving the motion equation of perturbation mode on super sound horizon scale for any background evolution of early universe. It is found that if enough efolding number of primordial perturbation suitable for observable universe is required, then n≳1 needs to be satisfied, unless the scale of UV regime is quite low. However, the possible UV completeness of HL gravity helps to relax this bound.
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