Thermodynamical properties of apparent horizon in warped DGP braneworld

Thermodynamical properties of apparent horizon in warped DGP braneworld
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扭曲DGP膜世界中表观地平线的热力学特性

DOI:
10.1016/j.nuclphysb.2007.04.028
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发表时间:
2007-01
期刊:
影响因子:
2.8
通讯作者:
Bin Wang
Bin Wang
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Cai, Rong-Gen;Sheykhi, Ahmad;Bin Wang

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本文首先得到嵌入在(n+1)维体中的(n−)1维膜的Friedmann方程,其中包含膜的内禀曲率项(dgp模型)。然后,我们证明了无论膜上是否存在本征曲率项或整体中是否存在宇宙学常数,人们总是可以在膜的视界处以热力学第一定律的形式改写Friedmann方程,de=Tds+WdV。利用第一定律,我们求出了膜上视界的熵表达式。我们还证明了在没有内禀曲率项的情况下,用膜上的视界和用体几何表示的熵是相同的。当出现内禀曲率时,膜上视界的熵分为两部分,一部分遵循膜上的n维面积公式,另一部分与没有内禀曲率项的情况下的熵相同。有趣的是,在翘曲DGP模型中,体和膜上的熵表示是不同的。这是合理的,因为在这个模型中,膜上的重力有两部分,一部分是由(n+1)维体重力引起的,另一部分是由膜上的本征曲率项引起的。
In this paper we first obtain Friedmann equations for the (n−1)-dimensional brane embedded in the (n+1)-dimensional bulk, with intrinsic curvature term of the brane included in the action (DGP model). Then, we show that one can always rewrite the Friedmann equations in the form of the first law of thermodynamics, dE=TdS+WdV, at apparent horizon on the brane, regardless of whether there is the intrinsic curvature term on the brane or a cosmological constant in the bulk. Using the first law, we extract the entropy expression of the apparent horizon on the brane. We also show that in the case without the intrinsic curvature term, the entropy expressions are the same by using the apparent horizon on the brane and by using the bulk geometry. When the intrinsic curvature appears, the entropy of apparent horizon on the brane has two parts, one part follows the n-dimensional area formula on the brane, and the other part is the same as the entropy in the case without the intrinsic curvature term. As an interesting result, in the warped DGP model, the entropy expression in the bulk and on the brane are not the same. This is reasonable, since in this model gravity on the brane has two parts, one induced from the (n+1)-dimensional bulk gravity and the other due to the intrinsic curvature term on the brane.
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