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arXiv 1801.05070gr-qcastro-ph.COhep-th
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有限曲率不变量球对称解的奇异性

Singularities in Spherically Symmetric Solutions with Limited Curvature Invariants

Daisuke Yoshida, Robert H. Brandenberger

摘要:

我们研究静态的,球对称的引力理论的解决方案,有有限的曲率不变量,旨在消除史瓦西时空的奇异性。我们发现,如果我们只限制Gauss-Bonnet项和Ricci标量,那么在原点的奇异性仍然存在。此外,我们发现事件视界可以发展出曲率奇点。我们还研究了一类新的理论,其中的所有组成部分的黎曼张量有界。我们发现在这个理论中,二次曲率不变量在事件视界的发散是可以避免的。然而,由于额外自由度的动力学而产生的其他类型的奇点不能被去除,时空仍然是奇异的。

英文摘要:

We investigate static, spherically symmetric solutions in gravitational theories which have limited curvature invariants, aiming to remove the singularity in the Schwarzschild space-time. We find that if we only limit the Gauss-Bonnet term and the Ricci scalar, then the singularity at the origin persists. Moreover we find that the event horizon can develop a curvature singularity. We also investigate a new class of theories in which all components of the Riemann tensor are bounded. We find that the divergence of the quadratic curvature invariants at the event horizon is avoidable in this theory. However, other kinds of singularities due to the dynamics of additional degrees of freedom cannot be removed, and the space-time remains singular.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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