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arXiv 2402.07957gr-qc
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能动量平方引力中的引力坍缩:奇点的性质

Gravitational Collapse in Energy-momentum squared gravity: Nature of singularities

Prabir Rudra

AI总结:

本文研究了能动量平方引力(EMSG)背景下的引力坍缩机制,通过Vaidya度规推导场方程并分析两种曲率-物质耦合模型,发现坍缩最终状态通常不形成黑洞而是支持裸奇点的形成。

摘要:

在本文中,我们探讨了能动量平方引力(EMSG)背景下的坍缩场景。EMSG声称包含源自模拟圈量子引力的量子引力效应的项。因此,该框架允许在有限时间内发生反弹,从而避免奇点。由此自然产生的问题是:是否存在形成黑洞的现实可能性,还是量子引力效应足够强以至于能完全避免这种病态?受此启发,我们致力于研究EMSG背景下的引力坍缩机制,并探究该过程的最终命运。我们用Vaidya度规对大质量恒星的时空进行建模,并推导了EMSG中的场方程。然后,利用这些方程,我们继续研究了两种具有不同曲率-物质耦合形式的特定EMSG模型中的引力坍缩机制。主要目标是探测作为坍缩最终状态的奇点(如果形成)的性质。我们发现,这些模型通常都不允许将黑洞的形成作为坍缩的最终状态,相反,它们支持裸奇点的形成。这可归因于基本层面上引力相互作用的量子涨落。

英文摘要:

In this paper, we explore a collapsing scenario in the background of energy-momentum squared gravity (EMSG). EMSG claims to have terms that originate from the quantum gravity effects mimicking loop quantum gravity. As a result, the framework admits a bounce at a finite time thus avoiding a singularity. So the question that naturally arises: Is there any realistic chance of the formation of a black hole or the quantum gravity effects are strong enough to totally avoid such a pathology? Motivated by this we are interested in studying a gravitational collapse mechanism in the background of EMSG and investigate the fate of such a process. We model the spacetime of a massive star by the Vaidya metric and derive the field equations in EMSG. Then using the equations we go on to study a gravitational collapse mechanism, on two specific models of EMSG with different forms of curvature-matter coupling. The prime objective is to probe the nature of singularity (if formed) as the end state of the collapse. We see that none of the models generically admit the formation of black holes as the end state of collapse, but on the contrary, they support the formation of naked singularities. This can be attributed to the quantum fluctuations of the gravitational interactions at the fundamental level.

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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