Super-horizon primordial black holes
Super-horizon primordial black holes
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DOI：
10.1103/physrevd.72.044021
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发表时间：
2005-08
影响因子：
5
通讯作者：
T. Harada;B. Carr
中科院分区：
文献类型：
--
作者：
T. Harada;B. Carr
本文讨论了在平坦Friedmann背景下描述原初黑洞的爱因斯坦方程的一类新的解。如果史瓦西黑洞通过一个过渡区被修补到弗里德曼背景上，就会出现这样的解。如果黑洞的视界大于宇宙学的视视界，它们是可能的。这种解决方案有许多奇怪的特点。特别是，人们必须仔细定义黑洞和宇宙学视界，然后发现当黑洞大于弗里德曼宇宙学视视界时，黑洞事件视界内包含的质量减少，尽管它的面积总是增加。这些解决方案涉及两个不同的未来零无限，并解释为转换的白色洞到黑洞。虽然这样的解可能不会像标准的PBH那样从引力坍缩中形成，但它们没有任何非物理性，因为所有的能量和因果关系条件都得到了满足。他们的共形图是扩展史瓦西解的Kruskal图和平坦弗里德曼背景下黑洞的共形图的自然融合。在本文中，这样的解决方案是获得数值formoro球对称的宇宙包含一个无质量的标量场，但它很可能是存在的更一般的物质场和不太对称的系统。«少
We discuss a new class of solutions to the Einstein equations which describe a primordial black hole (PBH) in a flat Friedmann background. Such solutions arise if a Schwarzschild black hole is patched onto a Friedmann background via a transition region. They are possible providing the black hole event horizon is larger than the cosmological apparent horizon. Such solutions have a number of strange features. In particular, one has to define the black hole and cosmological horizons carefully and one then finds that the mass contained within the black hole event horizon decreases when the black hole is larger than the Friedmann cosmological apparent horizon, although its area always increases. These solutions involve two distinct future null infinities and are interpreted as the conversion of a white hole into a black hole. Although such solutions may not form from gravitational collapse in the same way as standard PBHs, there is nothing unphysical about them, since all energy and causality conditions are satisfied. Their conformal diagram is a natural amalgamation of the Kruskal diagram for the extended Schwarzschild solution and the conformal diagram for a black hole in a flat Friedmann background. In this paper, such solutions are obtained numerically formore » a spherically symmetric universe containing a massless scalar field, but it is likely that they exist for more general matter fields and less symmetric systems.« less