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arXiv 1503.00666gr-qc
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渐近平坦和AdS时空中的同调性和拟自相似性

Homothety and Quasi Self Similarity in Asymptotically Flat and AdS Spacetimes

Wenli Zhao

摘要:

本文研究了球对称自引力标量场在不同维渐近平坦时空和AdS时空中的自相似解和拟自相似解。我们的主要方法依赖于减少爱因斯坦-克莱因-戈登方程组的自相似假设下的动力系统。应用标准技术在动力系统的分析,我们研究相应的相图,获得一些洞察系统的短期和长期的演变。在渐近平坦的情况下,动力系统的不动点对应于共形平坦的时空。我们观察到一个新的过渡从一个固定点到一个黑洞,我们计算相应的指数解析。在AdS时空中,我们观察到了准自相似标量场在中心附近发生干涉后散射到无穷远,对应于没有不动点的动力系统。

英文摘要:

For a spherically symmetric self-gravitating scalar field we study self similar and quasi-self similar solutions in asymptotically flat and AdS spacetimes in various dimensions. Our main approach relies on reducing the Einstein-Klein-Gordon system of equations under the self similarity assumption to a dynamical system. Applying standard techniques in the analysis of dynamical system we study the corresponding phase diagrams, gaining some insight into the short and long-term evolution of the system. In the asymptotically flat case the fixed points of the dynamical system correspond to conformally flat spacetimes. We observed a new transition from a fixed point to a black hole and we compute the corresponding exponent analytically. In the case of AdS spacetime, we observed the quasi self similar scalar field scattering to infinity after interfering near the center corresponding to the dynamical system with no fixed points.

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