arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 2601.20140gr-qc
收藏

引力坍缩中的时间箭头问题

Arrow of time problem in gravitational collapse

University of KwaZulu-Natal(夸祖鲁-纳塔尔大学);St.Xavier’s College (Autonomous)(圣泽维尔学院(自治))

Samarjit Chakraborty, Sunil D. Maharaj, Rituparno Goswami, Sarbari Guha

AI总结:

本文研究高维引力坍缩中时间箭头问题,发现引力熵时间箭头与热力学时间箭头方向相反,揭示局部应用韦伊尔曲率假说的局限性。

摘要:

我们研究了在高维空间中,辐射星体引力坍缩背景下中性及带电物质的引力时间箭头问题。内部时空由一个无剪切的球对称度规描述,该度规充满一种耗散流体。辐射星体的外部时空取为高维Vaidya度规。我们证明,与引力熵相关的时间箭头与热力学时间箭头方向相反,无论维度如何。我们考虑了这些结果的物理后果。我们的结果与之前关于无剪切球形坍缩的研究一致,表明避免裸奇点作为终态会导致错误的时间箭头,表明局部应用韦伊尔曲率假说存在根本问题。

英文摘要:

We investigate the arrow of time problem in the context of gravitational collapse of radiating stars in higher dimensions for both neutral and charged matter. The interior spacetime is described by a shear-free spherically symmetric metric filled with a dissipative fluid. The exterior spacetime of the radiating star is taken as the higher dimensional Vaidya metric. We establish that the arrow of time associated with gravitational entropy is opposite to the thermodynamic arrow of time for all dimensions. The physical consequences of our results are considered. Our result conforms with previous studies on shear-free spherical collapse, which suggests, avoidance of the naked singularity as the end state results in a wrong arrow of time, indicating a fundamental problem with the local application of the Weyl curvature hypothesis.

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。

↑