A Note on Crossing the Phantom Divide in Hybrid Dark Energy Model

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dc.creatorWei, Hao
dc.creatorCai, Rong-Gen
dc.date2005-12-01
dc.date2006-02-14
dc.date.accessioned2026-07-07T10:43:26Z
dc.date.available2026-07-07T10:43:26Z
dc.descriptionRecently a lot of attention has been given to building dark energy models in which the equation-of-state parameter $w$ can cross the phantom divide $w=-1$. However, to our knowledge, these models with crossing the phantom divide only provide the possibility that $w$ can cross -1. They do not answer another question: {\em why crossing phantom divide occurs recently?} Since in many existing models whose equation-of-state parameter can cross the phantom divide, $w$ undulates around -1 randomly, {\em why are we living in an epoch $w<-1$?} This can be regarded as the second cosmological coincidence problem. In this note, we propose a possible approach to alleviate this problem within a hybrid dark energy model.
dc.description9 pages, 3 figures, Latex2e; v2: references added; v3: discussions added, accepted by Phys.Lett.B; v4: published version
dc.identifierhttps://arxiv.org/abs/astro-ph/0512018
dc.identifierhttp://arxiv.org/abs/astro-ph/0512018
dc.identifierPhys.Lett.B634:9-13,2006
dc.identifierdoi:10.1016/j.physletb.2006.01.043
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/182241
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Theory
dc.titleA Note on Crossing the Phantom Divide in Hybrid Dark Energy Model
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