Avoidance of future singularities in loop quantum cosmology

M. Sami, Parampreet Singh, Shinji Tsujikawa

研究成果: Article

124 引用 (Scopus)

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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.

元の言語English
記事番号043514
ジャーナルPhysical Review D - Particles, Fields, Gravitation and Cosmology
74
発行部数4
DOI
出版物ステータスPublished - 2006

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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