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arXiv 1612.04889gr-qchep-th
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不完全是黑洞

Not quite a black hole

Bob Holdom, Jing Ren

摘要:

天体物理学上的黑洞候选者,虽然长期以来被认为有视界,但可能是没有视界的超紧凑物体。这种有趣的可能性是由黑洞信息悖论和与量子引力的合理基本联系激发的。渐近自由二次引力是广义相对论的UV完备。一个抓住其主要特征的经典理论被用来寻找源于物质的解决方案。我们发现,足够密集的物质产生了一种新的无视界结构,2-2-孔,它密切匹配外部史瓦西解下降到普朗克适当长度的未来的地平线。2-2-洞的特征是内部的体积缩小和看似无害的类时曲率奇点。内部也有一个新的缩放行为相对于2-2-孔的物理质量。这导致了极深的引力势,粒子通过碰撞被有效地捕获。作为一般的静态解,2-2黑洞可能是引力坍缩的近黑终点。对于2-2孔内部的外部探测器来说,有一个相当大的时间延迟,这决定了合并后引力波信号中回波的间隔。

英文摘要:

Astrophysical black hole candidates, although long thought to have a horizon, could be horizonless ultra-compact objects. This intriguing possibility is motivated by the black hole information paradox and a plausible fundamental connection with quantum gravity. Asymptotically free quadratic gravity is considered here as the UV completion of general relativity. A classical theory that captures its main features is used to search for solutions as sourced by matter. We find that sufficiently dense matter produces a novel horizonless configuration, the 2-2-hole, which closely matches the exterior Schwarzschild solution down to about a Planck proper length of the would-be horizon. The 2-2-hole is characterized by an interior with a shrinking volume and a seemingly innocuous timelike curvature singularity. The interior also has a novel scaling behavior with respect to the physical mass of the 2-2-hole. This leads to an extremely deep gravitational potential in which particles get efficiently trapped via collisions. As a generic static solution, the 2-2-hole may then be the nearly black endpoint of gravitational collapse. There is a considerable time delay for external probes of the 2-2-hole interior, and this determines the spacing of echoes in a post-merger gravitational wave signal.

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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