Spherical collapse model in agegraphic dark energy cosmologies
نویسندگان
چکیده
منابع مشابه
On the spherical collapse model in dark energy cosmologies
We study the spherical collapse model in dark energy cosmologies, in which dark energy is modelled as a minimally coupled scalar field. We first follow the standard assumption that dark energy does not cluster on the scales of interest. Investigating four different popular potentials in detail, we show that the predictions of the spherical collapse model depend on the potential used. We also in...
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A new dark energy model, named as “agegraphic dark energy”, has been proposed by one of us (R. G. Cai) in arXiv:0707.4049, based on the Károlyházy uncertainty relation, which arises from the quantum mechanics together with general relativity. In this note, we extend the original agegraphic dark energy model by including the interaction between the agegraphic dark energy and the pressureless (da...
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We investigate a spherical overdensity model for the non-clustering dark energy (DE) with the constant equation of state, ωde in a flat universe. In this case, the exact solution for the evolution of the scale factor is obtained for general ωde. We also obtain the exact (when ωde = −13) and the approximate (when ωde 6= −13) solutions for the ratio of the overdensity radius to its value at the t...
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Recently a new model of dynamical dark energy, or time-varying Λ, was proposed by Cai [arXiv:0707.4049] by relating the energy density of quantum fluctuations in a Minkowski spacetime, namely ρq ≡ 3n2m2P /t, where n ∼ O(1) and t is the cosmic time, to the present day dark energy density. In this note, we show that the model can be adjusted to the present values of dark energy density parameter ...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2017
ISSN: 2470-0010,2470-0029
DOI: 10.1103/physrevd.96.063519