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IRREVERSIBLE GRAVITATIONAL COLLAPSE: BLACK STARS OR BLACK HOLES?

机译：不可思议的重力崩溃：黑星还是黑洞？

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摘要

It is well known that the concept of black hole has been considered very fascinating by scientists even before the introduction of Einstein's general relativity. They should be the final result of an irreversible gravitational collapse of very massive bodies.However, an unsolved problem concerning such objects is the presence of a space-time singularity in their core. Such a problem was present starting by the first historical papers concerning black holes. It is a common opinion that this problem could be solved when a correct quantum gravity theory will be, finally, constructed.In this work we review a way to remove black hole singularities at a classical level i.e. without arguments of quantum gravity. By using a particular non-linear electrodynamics Lagrangian, an exact solution of Einstein field equations is shown. The solution prevents the collapsing object to reach the gravitational radius, thus the final result becomes a black star, i.e. an astrophysical object where both of singularities and event horizons are removed. Such solution is not only a mathematical artifice. In fact, this kind of Lagrangian has been recently used in various analysis in astrophysics, like surface of neutron stars and pulsars. The authors also recently adapted the analysis on a cosmological context by showing that the big-bang singularity can be removed too.
机译：众所周知，甚至在引入爱因斯坦广义相对论之前，科学家就已经将黑洞的概念吸引到了。它们应该是非常巨大的物体发生不可逆的引力坍塌的最终结果。但是，有关此类物体的一个尚未解决的问题是它们的核心存在时空奇点。从有关黑洞的第一批历史论文开始就存在这样的问题。普遍的看法是，当最终构建正确的量子引力理论时，可以解决此问题。在这项工作中，我们回顾了一种在经典水平上消除黑洞奇点的方法，即无需量子引力的论点。通过使用特定的非线性电动力学拉格朗日，显示了爱因斯坦场方程的精确解。该解决方案防止了坍缩的物体达到重力半径，因此最终结果成为一颗黑星，即一个天体物理物体，其中奇异点和事件视界都被去除了。这样的解决方案不仅是数学手段。实际上，这种拉格朗日算子最近已用于天体物理学的各种分析中，例如中子星和脉冲星的表面。作者最近还通过证明也可以消除大爆炸奇点来适应宇宙背景的分析。

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  • 来源
    《Hadronic Journal》 |2011年第2期|p.149-160|共12页
  • 作者

    Cristian Corda; Herman J. Mosquera Cuesta;

  • 作者单位

    Institute for Basic Research, Palm Harbor, Florida 34684 U.S A. International Institute for Theoretical Physics and Mathematics Eistein-Galilei, Via Santa Gonda, 14-59100 Prato, Italy;

    Departmento de Fisica Universidade Estadual Vale do Acarau Avenida da Universidade 850 Campus da Betania, CEP 62.040-370, Sobral, Ceara, Brazil Instituto de Cosmologia, Relatividade e Astrofisica (ICRA-BR), Centro Brasilero de Pasquisas Fisicas, Rua Dr. Xavier Sigaud 150 CEP 22290-180, Urea Rio de Janeiro, RJ, Brazil;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    Black holes; singularity; nonlinear electrodynamics; extremely elec- tromagnetic compact objects;

    机译：黑洞;奇异性;非线性电动力学;极电磁致密物体;

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