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General Relativity and Quantum Cosmology

arXiv:0706.3757 (gr-qc)
[Submitted on 26 Jun 2007 (v1), last revised 20 Jul 2007 (this version, v2)]

Title:Instability of holographic dark energy models

Authors:Yun Soo Myung
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Abstract: We 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.
Comments: 11 pages, 4 eps figures, to appear in PLB
Subjects: General Relativity and Quantum Cosmology (gr-qc); Astrophysics (astro-ph); High Energy Physics - Theory (hep-th)
Report number: INJE-TP-07-05
Cite as: arXiv:0706.3757 [gr-qc]
  (or arXiv:0706.3757v2 [gr-qc] for this version)
  https://doi.org/10.48550/arXiv.0706.3757
Journal reference: Phys.Lett.B652:223-227,2007
Related DOI: https://doi.org/10.1016/j.physletb.2007.07.033

Submission history

From: Yun Soo Myung [view email]
[v1] Tue, 26 Jun 2007 05:09:59 UTC (210 KB)
[v2] Fri, 20 Jul 2007 04:49:54 UTC (276 KB)
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