Black holes and dark energy from gravitational collapse on the brane

Black holes and dark energy from gravitational collapse on the brane
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黑洞和膜上引力塌缩产生的暗能量

DOI:
10.1088/1475-7516/2007/02/027
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发表时间:
2006
影响因子:
6.4
通讯作者:
L. Gergely
L. Gergely
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
L. Gergely

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广义相对论中无压流体的引力崩塌(奥本海默-斯奈德崩塌)导致了黑洞。对薄膜世界场景中同样现象的研究表明,坍塌的尘埃球体的外部不可能是静态的。我们证明,在考虑压力的情况下,流体球体的外部可以是静态的。根据修正的引力动力学,薄膜上的引力塌陷继续进行,将最初几乎像尘埃一样的构型转变为具有张力的流体。张力源于能量动量张量中动力学方程的非线性,并且在广义相对论极限中消失。在地平线以下,这种张力将恒星转化为暗能量。对于天体物理黑洞,这种转变发生在视界以下,而对于中等质量和星系黑洞,这种转变发生在视界之外。此外,在崩塌过程中,能量密度和张力都向无限值增加。然而,无限的张力并不能阻止奇点的形成。
The gravitational collapse of a pressureless fluid in general relativity (Oppenheimer–Snyder collapse) results in a black hole. The study of the same phenomenon in the brane-world scenario has shown that the exterior of the collapsing dust sphere cannot be static. We show that by allowing for pressure, the exterior of a fluid sphere can be static. The gravitational collapse on the brane proceeds according to the modified gravitational dynamics, turning the initial nearly dust-like configuration into a fluid with tension. The tension arises from the nonlinearity of the dynamical equations in the energy–momentum tensor, and it vanishes in the general relativistic limit. Below the horizon the tension turns the star into dark energy. This transition occurs right below the horizon for astrophysical black holes and far beyond the horizon for intermediate mass and galactic black holes. Further, both the energy density and the tension increase towards infinite values during the collapse. The infinite tension, however, could not stop the formation of the singularity.
具有高斯-帽项的膜世界的协变引力方程。
DOI: --
发表时间: 2004
期刊: Phys.Rev. D69
影响因子: --
作者:
Kei-ichi Maeda;Takashi Torii
通讯作者: Takashi Torii