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arXiv 0707.0042gr-qc
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史瓦西星附近静电电荷的自作用力

Self force of a static electric charge near a Schwarzschild Star

Karthik Shankar, Bernard F. Whiting

摘要:

当一个电荷在一个等密度球形恒星附近保持静止时,它会受到一种自作用力,这种自作用力与它在一个相同质量的黑洞附近所受到的力明显不同。本文给出了绝缘Schwarzschild星的自作用力(由局部惯性观测者测量)的表达式,并对中心有奇点的极端密度情形进行了计算.这个力被认为是排斥力。对导电星也进行了类似的自作用力计算。这个计算对任何静态的球形导电恒星都是有效的,因为结果与内部度规无关。当电荷被放置在离导电星很近的地方时,力被发现是吸引力,但是当电荷被放置在超过一定距离(对于半径为2.25 M的导电星,距离为2.95 M)的地方时,力被发现是排斥力。当电荷被放置在离恒星很远的地方时(无论是导电的还是绝缘的),电荷所受到的排斥力与它被放置在与恒星质量相同的黑洞的时空中时所受到的排斥力相同。

英文摘要:

When a charge is held static near a constant density spherical star, it experiences a self-force which is significantly different from the force it would experience when placed near a black hole of the same mass. In this paper, an expression for the self-force (as measured by a locally inertial observer) is given %explicitly calculated for an insulating Schwarzschild star, and the result is explicitly computed for the extreme density case, which has a singularity at its center. The force is found to be repulsive. A similar calculation of the self-force is also performed for a conducting star. This calculation is valid for any static, spherically conducting star, since the result is independent of the interior metric. When the charge is placed very close to the conducting star, the force is found to be attractive but when the charge is placed beyond a certain distance (2.95M for a conducting star of radius 2.25M), the force is found to be repulsive. When the charge is placed very far from the star (be it conducting or insulating), the charge experiences the same repulsive force it would experience when placed in the spacetime of a black hole with the same mass as the star.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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