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arXiv 0811.1643gr-qcastro-ph
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Brans-Dicke理论的各向异性

Anisotropy due to Brans-Dicke Theory

Seokcheon Lee

摘要:

众所周知,Kasner形式的粘性Bianchi I型度规不能描述满足热力学第二定律和爱因斯坦引力理论中的主导能量条件的各向异性宇宙。我们在Brans-Dicke引力理论中使用Bianchi I型度规和理想流体来研究这个问题。我们证明了在这个模型中存在优势能量条件和熵增长是可能的。我们也应用这个模型来解释WMAP数据中观测到的温度各向异性的角功率谱的低四极振幅的异常。

英文摘要:

It is well known that the viscous Bianchi type-I metric of the Kasner form is not able to describe an anisotropic universe, which satisfies the second law of thermodynamics and the dominant energy condition in Einstein's theory of gravity. We investigate this problem in Brans-Dicke theory of gravity using the Bianchi type-I metric with the perfect fluid. We show that it is possible to have the dominant energy condition and the growth of entropy in this model. Also we apply this model to explain the anomaly concerning the low quadrupole amplitude of the angular power spectrum of the temperature anisotropy observed in WMAP data.

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