Instability of holographic dark energy models

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dc.creatorMyung, Yun Soo
dc.date2007-06-26
dc.date2007-07-20
dc.date.accessioned2026-07-07T10:56:26Z
dc.date.available2026-07-07T10:56:26Z
dc.descriptionWe investigate the difference between holographic dark energy, Chaplygin gas, and tachyon model with constant potential. For this purpose, we examine their squared speeds of sound which are evaluated to zeroth order in perturbation theory and hence depends only on time. We find that the squared speed for holographic dark energy is always negative when choosing the future event horizon as the IR cutoff, while those for Chaplygin gas and tachyon are non-negative. This means that the perfect fluid for holographic dark energy is classically unstable. Hence the holographic interpretation for Chaplygin gas and tachyon is problematic.
dc.description11 pages, 4 eps figures, to appear in PLB
dc.identifierhttps://arxiv.org/abs/0706.3757
dc.identifierhttp://arxiv.org/abs/0706.3757
dc.identifierPhys.Lett.B652:223-227,2007
dc.identifierdoi:10.1016/j.physletb.2007.07.033
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/186411
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectAstrophysics
dc.subjectHigh Energy Physics - Theory
dc.titleInstability of holographic dark energy models
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