A New Model of Agegraphic Dark Energy

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dc.creatorWei, Hao
dc.creatorCai, Rong-Gen
dc.date2007-08-07
dc.date2008-02-14
dc.date.accessioned2026-07-07T11:18:28Z
dc.date.available2026-07-07T11:18:28Z
dc.descriptionIn this note, we propose a new model of agegraphic dark energy based on the Károlyházy relation, where the time scale is chosen to be the conformal time $η$ of the Friedmann-Robertson-Walker (FRW) universe. We find that in the radiation-dominated epoch, the equation-of-state parameter of the new agegraphic dark energy $w_q=-1/3$ whereas $Ω_q=n^2a^2$; in the matter-dominated epoch, $w_q=-2/3$ whereas $Ω_q=n^2a^2/4$; eventually, the new agegraphic dark energy dominates; in the late time $w_q\to -1$ when $a\to\infty$, and the new agegraphic dark energy mimics a cosmological constant. In every stage, all things are consistent. The confusion in the original agegraphic dark energy model proposed in arXiv:0707.4049 disappears in this new model. Furthermore, $Ω_q\ll 1$ is naturally satisfied in both radiation-dominated and matter-dominated epochs where $a\ll 1$. In addition, we further extend the new agegraphic dark energy model by including the interaction between the new agegraphic dark energy and background matter. In this case, we find that $w_q$ can cross the phantom divide.
dc.description8 pages, revtex4; v2: Phys. Lett. B in press; v3: published version
dc.identifierhttps://arxiv.org/abs/0708.0884
dc.identifierhttp://arxiv.org/abs/0708.0884
dc.identifierPhys.Lett.B660:113-117,2008
dc.identifierdoi:10.1016/j.physletb.2007.12.030
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/193355
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Theory
dc.titleA New Model of Agegraphic Dark Energy
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