Stability of singularity-free cosmological solutions in Hořava-Lifshitz gravity

Yosuke Misonoh*, Mitsuhiro Fukushima, Shoichiro Miyashita

*この研究の対応する著者

研究成果: Article査読

9 被引用数 (Scopus)

抄録

We study the stability of singularity-free cosmological solutions with a positive cosmological constant based on the projectable Hořava-Lifshitz (HL) theory. In the HL theory, the isotropic and homogeneous cosmological solutions with bounce can be realized if the spatial curvature is nonzero. By performing a perturbation analysis around nonflat Friedmann-Lemaître-Robertson-Walker (FLRW) spacetime, we derive a quadratic action and discuss the stability, i.e., ghost and tachyon-free conditions. Although the squared effective mass of scalar perturbation must be negative in the infrared regime, we can avoid tachyon instability by considering strong Hubble friction. Additionally, we estimate the backreaction from the perturbations on the background geometry, especially against an anisotropic perturbation in closed FLRW spacetime. It turns out that certain types of bouncing solution may be spoiled even if all perturbation modes are stable.

本文言語English
論文番号044044
ジャーナルPhysical Review D
95
4
DOI
出版ステータスPublished - 2017 2 28

ASJC Scopus subject areas

  • 物理学および天文学(その他)

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