Rovelli 2014 普朗克星

主要内容:
作者认为大质量恒星坍缩成黑洞的时候可以并不真的成为黑洞，而是由于所谓的“量子引力压”抵抗住了引力（注意在视界面以内），从而称为普朗克星。这个量子引力压可以产生反弹，然后以霍金辐射的形式，看起来像黑洞蒸发。所观测到的可能就是一个伽马暴，当然不是大多数和超新星成协的伽马暴。因为从坍缩到反弹虽然在当地系可以是很短的时间，但是由于巨大的引力红移，在观测者看是一个超级长的时间，可能就和霍金算的黑洞蒸发的时间一样吧，不过如果一样的话现在就看不到，太长了。

作者所要解决的问题是恒星在坍缩成黑洞，然后再蒸发的过程中信息丢失了。但如果没有奇点，信息就不丢失。

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Title:		Planck stars
Authors:		Rovelli, Carlo; Vidotto, Francesca
Publication:		eprint arXiv:1401.6562
Publication Date:		01/2014
Origin:		ARXIV
Keywords:		General Relativity and Quantum Cosmology, Astrophysics - High Energy Astrophysical Phenomena, High Energy Physics - Theory
Comment:		6 pages, 3 figures. Nice paper
Bibliographic Code:		2014arXiv1401.6562R

Abstract

A star that collapses gravitationally can reach a further stage of its life, where quantum-gravitational pressure counteracts weight. The duration of this stage is very short in the star proper time, yielding a bounce, but extremely long seen from the outside, because of the huge gravitational time dilation. Since the onset of quantum-gravitational effects is governed by energy density ---not by size--- the star can be much larger than planckian in this phase. The object emerging at the end of the Hawking evaporation of a black hole can then be larger than planckian by a factor $(m/m_{\scriptscriptstyle P})^n$, where $m$ is the mass fallen into the hole, $m_{\scriptscriptstyle P}$ is the Planck mass, and $n$ is positive. We consider arguments for $n=1/3$ and for $n=1$. There is no causality violation or faster-than-light propagation. The existence of these objects alleviates the black-hole information paradox. More interestingly, these objects could have astrophysical and cosmological interest: they produce a detectable signal, of quantum gravitational origin, around the $10^{-14} cm$ wavelength.

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