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arXiv 0802.0530gr-qcastro-phhep-th
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d维时空中的Bonnor星

Bonnor stars in d spacetime dimensions

José P. S. Lemos, Vilson T. Zanchin

摘要:

邦纳星是一种规则的静态致密平衡态,由极端尘埃流体组成,一种质量密度等于电荷密度的带电尘埃流体,加入到外部真空溶液中,在牛顿引力和广义相对论中。在四维空间中,它们服从相应的马宗达-帕帕佩特鲁系统,其中引力势是电势场的简单函数,而流体(如果存在的话)是由极端尘埃组成的。Majumdar-Papapetrou系统可以推广到d时空维度。因此,很自然地研究Bonnor解决方案在更高的d维。我们分析牛顿-库仑理论与带电流体在Majumdar-Papapetrou的背景下,在d=n+1时空维度,n的空间维数。在牛顿理论中,真空中引力势与电势的马朱姆达-帕帕佩特鲁关系式及其相关的外尔关系式与广义相对论是等价的。研究了一类球对称Bonnor星。在充分紧化下,它们形成质点荷电牛顿奇点。我们研究了带电流体的爱因斯坦-麦克斯韦理论中的模拟系统。我们重新陈述了这个系统的一些性质,并得到了d=n+1维时空中球对称的Bonnor星解。这些恒星在紧化作用下形成准黑洞。在高维中,简并压力支持的牛顿恒星或相对论恒星没有解,而电斥力支持的高维邦纳恒星在牛顿引力和广义相对论中确实有解。所以恒星的存在取决于维度的数量和潜在的场的含量。

英文摘要:

Bonnor stars are regular static compact configurations in equilibrium, composed of an extremal dust fluid, a charged dust fluid where the mass density is equal to the charge density, joined to an exterior vacuum solution, within Newtonian gravity and general relativity. In four dimensions, they obey the corresponding Majumdar-Papapetrou system, where the gravitational potential is a simple function of the electric potential field and the fluid, when there is one, is made of extremal dust. The Majumdar-Papapetrou system can be generalized to d spacetime dimensions. Thus, it is natural to study Bonnor solutions in higher d dimensions. We analyze Newton-Coulomb theory with an electrically charged fluid in a Majumdar-Papapetrou context, in d=n+1 spacetime dimensions, n the number of spatial dimensions. Within the Newtonian theory, in vacuum, the Majumdar-Papapetrou relation for the gravitational potential in terms of the electric potential, and its related Weyl relation, are equivalent, in contrast with general relativity. We study a class of spherically symmetric Bonnor stars. Under sufficient compactification they form point mass charged Newtonian singularities. We study the analogue systems in the Einstein-Maxwell theory with an electrically charged fluid. We restate some properties of this system and obtain spherically symmetric Bonnor star solutions in d=n+1 spacetime dimensions. These stars, under compactification, form quasi-black holes. Whereas there are no solutions for Newtonian or relativistic stars supported by degenerate pressure in higher dimensions, higher dimensional Bonnor stars, supported by electric repulsion, do indeed have solutions within Newtonian gravity and general relativity. So the existence of stars depends on the number of dimensions and on the underlying field content.

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