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arXiv 0706.3757gr-qcastro-phhep-th
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全息暗能量模型的不稳定性

Instability of holographic dark energy models

Yun Soo Myung

摘要:

我们研究了全息暗能量、Chaubergin气体和常势快子模型之间的区别。为此目的,我们检查他们的平方声速的评估为零阶微扰理论,因此只依赖于时间。我们发现当选择未来事件视界作为红外截止点时,全息暗能量的速度平方总是负值,而Chaubergin气体和快子的速度平方是非负值.这意味着全息暗能量的完美流体是经典的不稳定。因此,Chaubergin气体和快子的全息解释是有问题的。

英文摘要:

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.

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