Avoidance of future singularities in loop quantum cosmology
Avoidance of future singularities in loop quantum cosmology
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DOI：
10.1103/physrevd.74.043514
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发表时间：
2006-05
影响因子：
5
通讯作者：
M. Sami;Parampreet Singh;S. Tsujikawa
中科院分区：
文献类型：
--
作者：
M. Sami;Parampreet Singh;S. Tsujikawa
We consider the fate of future singularities in the effective dynamics of loop quantum cosmology. Nonperturbative quantum geometric effects which lead to ${\ensuremath{\rho}}^{2}$ modification of the Friedmann equation at high energies result in generic resolution of singularities whenever energy density $\ensuremath{\rho}$ 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.
