2006 (IPP)

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Author: search.filters.author.Singh, ParampreetSubject: search.filters.subject.Loop quantum cosmology

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    Avoidance of future singularities in loop quantum cosmology
    (2006-05-21) Sami, M.; Singh, Parampreet; Tsujikawa, Shinji
    We consider the fate of future singularities in the effective dynamics of loop quantum cosmology. Non-perturbative 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 Planck. If the value of this ratio is greater than unity, the universe escapes the sudden future singularity and becomes oscillatory.