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arXiv 1901.03055gr-qc
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Rastall引力理论中的引力坍缩

Gravitational Collapse in Rastall Gravity

A. H. Ziaie, H. Moradpour, S. Ghaffari

摘要:

研究了均匀理想流体在Rastall引力场中的球对称引力坍缩。考虑到线性状态方程(EoS)的流体剖面,我们研究的条件下,崩溃的情况下,可能会结束在时空奇点。根据模型参数的不同,奇点可能是裸露的,也可能被视界覆盖。我们发现一个非零的Rastall参数可能会影响视视界的形成,因此,裸奇点可能会形成的EoS参数值的均匀理想流体的崩溃在广义相对论(GR)终止于黑洞形成。因此,由此产生的奇点的可见性取决于Rastall参数。我们得到的解决方案尊重弱能量条件(WEC),这是至关重要的物理模型的有效性。

英文摘要:

We study spherically symmetric gravitational collapse of a homogeneous perfect fluid in Rastall gravity. Considering a linear equation of state (EoS) for the fluid profiles, we examine the conditions under which the collapse scenario could end in a spacetime singularity. Depending on the model parameters, the singularity could be either naked or covered by a horizon. We find that a non-vanishing Rastall parameter could affect the formation of apparent horizon so that, naked singularities may form for those values of EoS parameter for which a homogeneous perfect fluid collapse in general relativity (GR) terminates at the black hole formation. Hence the visibility of the resulting singularity depends on the Rastall parameter. The solutions we obtain respect the weak energy condition (WEC) which is crucial for physical validity of the model.

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