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arXiv 1005.3673gr-qcastro-ph.COhep-th
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开放宇宙学模型中爱因斯坦静态宇宙的稳定性

Stability of the Einstein Static Universe in open cosmological models

Rosangela Canonico, Luca Parisi

摘要:

当宇宙学方程中出现修正项时,广义相对论的爱因斯坦静态解的稳定性会发生改变。本文在最近提出的两个量子引力模型的框架下研究了静态解的存在性和稳定性。本文将先前已知的对圈量子宇宙学半经典体系中的爱因斯坦静态解的分析推广到开放的宇宙学模型中,发现了静态中性稳定解,并在细致平衡和可投射条件下,在Horava-Lifshitz引力框架中进行了类似的分析.在开放的宇宙学模型中,所发现的两个解可以是不稳定的,也可以是中性稳定的,这取决于参数的取值。

英文摘要:

The stability properties of the Einstein Static solution of General Relativity are altered when corrective terms arising from modification of the underlying gravitational theory appear in the cosmological equations. In this paper the existence and stability of static solutions are considered in the framework of two recently proposed quantum gravity models. The previously known analysis of the Einstein Static solutions in the semiclassical regime of Loop Quantum Cosmology with modifications to the gravitational sector is extended to open cosmological models where a static neutrally stable solution is found. A similar analysis is also performed in the framework of Horava-Lifshitz gravity under detailed balance and projectability conditions. In the case of open cosmological models the two solutions found can be either unstable or neutrally stable according with the admitted values of the parameters.

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