Spherical gravitational collapse in N dimensions

Spherical gravitational collapse in N dimensions
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N 维球形引力塌缩

DOI:
10.1103/physrevd.76.084026
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发表时间:
2006
期刊:
影响因子:
5
通讯作者:
P. Joshi
P. Joshi
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Rituparno Goswami;P. Joshi

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我们在这里研究具有任意维数和一般 I 型物质场的时空中的球对称引力塌缩,这是一个广泛的类别,包括大多数物理上合理的物质形式。我们证明,给定物质的初始数据,即坍缩演化的初始表面 t=t{sub i} 处的初始密度和压力分布,存在我们在此构建的爱因斯坦方程的其余初始数据函数和解类别,使得时空演化达到最终状态,即黑洞或裸奇点,这取决于初始数据和所选演化的性质,并受弱能量条件的有效性影响。根据黑洞物理学中的宇宙审查假说对结果进行了讨论和分析。这里的形式主义将早期关于四个维度引力塌缩的结果结合起来进行统一处理。此外,早期的工作还被推广到更高维的时空,以便研究维数对黑洞或裸奇点坍缩可能的最终结果的影响。更多» 对维数没有采用任何限制,并且避免了其他限制性假设,例如时空的自相似性,以保持处理的普遍性。我们的方法使我们能够在一定程度上考虑与引力塌缩中裸奇点的发生相关的通用性和稳定性方面。« less
We investigate here spherically symmetric gravitational collapse in a space-time with an arbitrary number of dimensions and with a general type I matter field, which is a broad class that includes most of the physically reasonable matter forms. We show that given the initial data for matter in terms of the initial density and pressure profiles at an initial surface t=t{sub i} from which the collapse evolves, there exist the rest of the initial data functions and classes of solutions of Einstein equations which we construct here, such that the space-time evolution goes to a final state which is either a black hole or a naked singularity, depending on the nature of initial data and evolutions chosen, and subject to validity of the weak energy condition. The results are discussed and analyzed in the light of the cosmic censorship hypothesis in black hole physics. The formalism here combines the earlier results on gravitational collapse in four dimensions in a unified treatment. Also the earlier work is generalized to higher-dimensional space-times to allow a study of the effect of the number of dimensions on the possible final outcome of the collapse in terms of either a black hole or naked singularity.more » No restriction is adopted on the number of dimensions, and other limiting assumptions such as self-similarity of space-time are avoided, in order to keep the treatment general. Our methodology allows us to consider to an extent the genericity and stability aspects related to the occurrence of naked singularities in gravitational collapse.« less
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