Avoidance of future singularities in loop quantum cosmology

M. Sami*, Parampreet Singh, Shinji Tsujikawa

*この研究の対応する著者

研究成果査読

128 被引用数 (Scopus)

抄録

We consider the fate of future singularities in the effective dynamics of loop quantum cosmology. Nonperturbative quantum geometric effects which lead to ρ2 modification of the Friedmann equation at high energies result in generic resolution of singularities whenever energy density ρ diverges at future singularities of Friedmann dynamics. Such quantum effects lead to the avoidance of a big rip, which is followed by a recollapsing universe stable against perturbations. Resolution of sudden singularity, the case when pressure diverges but energy density approaches a finite value depends on the ratio of the latter to a critical energy density of the order of the Planck value. If the value of this ratio is greater than unity, the universe escapes the sudden future singularity and becomes oscillatory.

本文言語English
論文番号043514
ジャーナルPhysical Review D - Particles, Fields, Gravitation and Cosmology
74
4
DOI
出版ステータスPublished - 2006
外部発表はい

ASJC Scopus subject areas

  • 核物理学および高エネルギー物理学
  • 物理学および天文学(その他)

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