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arXiv 1108.4385gr-qcastro-ph.CO
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广义引力理论中热力学量的研究

Study of Thermodynamic Quantities in Generalized Gravity Theories

Surajit Chattopadhyay, Ujjal Debnath, Samarpita Bhattacharya

摘要:

本文研究了Brans-Dicke、Ho $\check{\text r}$ ava-Lifshitz和$f(R)$引力等广义引力理论中的宇宙温度、热容和声速平方等热力学量。我们已经考虑过宇宙充满了暗物质和暗能量。我们还考虑了开模型、闭模型和平坦模型的状态方程参数。我们已经观察到,在所有情况下,物态方程的行为都象一个精粹。宇宙的温度和热容量被发现在所有情况下随着宇宙的膨胀而减小。在Brans-Dicke和$f(R)$引力理论中,发现声速平方在开、闭和平坦模型中表现出增加的行为;在Ho $\check{\text r}$ ava-Lifshitz引力理论中,发现声速平方在开和闭模型中表现出减小的行为。然而,对于平坦宇宙,在Ho $\check{\text r}$ ava-Lifshitz引力中,声速的平方保持恒定。

英文摘要:

In this work, we have studied the thermodynamic quantities like temperature of the universe, heat capacity and squared speed of sound in generalized gravity theories like Brans-Dicke, Ho$\check{\text r}$ava-Lifshitz and $f(R)$ gravities. We have considered the universe filled with dark matter and dark energy. Also we have considered the equation of state parameters for open, closed and flat models. We have observed that in all cases the equation of state behaves like quintessence. The temperature and heat capacity of the universe are found to decrease with the expansion of the universe in all cases. In Brans-Dicke and $f(R)$ gravity theories the squared speed of sound is found to exhibit increasing behavior for open, closed and flat models and in Ho$\check{\text r}$ava-Lifshitz gravity theory it is found to exhibit decreasing behavior for open and closed models with the evolution of the universe. However, for flat universe, the squared speed of sound remains constant in Ho$\check{\text r}$ava-Lifshitz gravity.

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