Thermodynamics of apparent horizon and Friedmann equations in big bounce universe
Thermodynamics of apparent horizon and Friedmann equations in big bounce universe
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DOI：
10.1007/s10714-016-2055-0
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发表时间：
2014-12
影响因子：
2.8
通讯作者：
Molin Liu;Yuling Yang;Jianbo Lu;Lixin Xu
中科院分区：
文献类型：
--
作者：
Molin Liu;Yuling Yang;Jianbo Lu;Lixin Xu
在本文中，我们研究了一个大反弹宇宙的典型非奇异的大反弹，而不是一个奇异的大爆炸。该宇宙学模型可以描述FRW模型中辐射主导的早期宇宙和物质主导的晚期宇宙。热力学和引力之间的联系在这里被观察到。在冷宇宙和热宇宙的早期阶段，我们发现只有一个几何包含一个具有一般状态参数的4D de Sitter宇宙。我们还发现，早期宇宙中的视视界的形式强烈地依赖于额外维度，这表明额外维度的影响原则上可以在早期宇宙中找到。此外，我们表明，在冷宇宙和热宇宙的后期阶段，视视界开始反弹的时刻基本上与宇宙学标量因子的行为保持一致。
In this paper, we study a big bounce universe typified by a non-singular big bounce, as opposed to a singular big bang. This cosmological model can describe radiation dominated early universe and matter dominated late universe in FRW model. The connections between thermodynamics and gravity are observed here. In the early stage of both cold and hot universes, we find there is only one geometry containing a 4D de Sitter universe with a general state parameter. We also find the form of the apparent horizon in the early universe strongly depends on the extra dimension, which suggests that the influence of the extra dimension could in principle be found in the early universe. Moreover, we show that in the late stages of both cold and hot universes, the moment when the apparent horizon begins to bounce keeps essentially in step with the behavior of the cosmological scalar factor.