Inhomogeneous Equation of State of the Universe: Phantom Era, Future Singularity and Crossing the Phantom Barrier

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dc.creatorNojiri, Shin'ichi
dc.creatorOdintsov, Sergei D.
dc.date2005-05-24
dc.date2005-07-28
dc.date.accessioned2026-07-07T10:45:12Z
dc.date.available2026-07-07T10:45:12Z
dc.descriptionThe dark energy universe equation of state (EOS) with inhomogeneous,Hubble parameter dependent term is considered. The motivation to introduce such a term comes from time-dependent viscosity considerations and modifications of general relativity. For several explicit examples of such EOS it is demonstrated how the type of future singularity changes, how the phantom epoch emerges and how crossing of phantom barrier occurs. Similar cosmological regimes are considered for the universe with two interacting fluids and for universe with implicit EOS. For instance, the crossing of phantom barrier is realized in easier way, thanks to the presence of inhomogeneous term. The thermodynamical dark energy model is presented where the universe entropy may be positive even at phantom era as a result of crossing of w=-1 barrier.
dc.descriptionLaTeX, 13 pages, refs. added, version to appear in PRD
dc.identifierhttps://arxiv.org/abs/hep-th/0505215
dc.identifierhttp://arxiv.org/abs/hep-th/0505215
dc.identifierPhys.Rev.D72:023003,2005
dc.identifierdoi:10.1103/PhysRevD.72.023003
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/182843
dc.subjectHigh Energy Physics - Theory
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.titleInhomogeneous Equation of State of the Universe: Phantom Era, Future Singularity and Crossing the Phantom Barrier
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