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arXiv 1402.6823gr-qcastro-ph.CO
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弱引力场和强引力场下Tangherlini时空中的引力透镜

Gravitational lensing in Tangherlini spacetime in the weak gravitational field and the strong gravitational field

Naoki Tsukamoto, Takao Kitamura, Koki Nakajima, Hideki Asada

摘要:

奇异透镜在弱引力场中的引力透镜效应一直是寻找不发光奇异天体的重要研究课题。基于1/r^n衰减度规的引力透镜作为一种单参数模型,可以在弱场中同时处理史瓦西透镜(n=1)和埃利斯虫洞(n=2),近年来得到了广泛的研究。然而,只有在n=1的情况下,才明确地表明强场引起的相对论透镜像对光变曲线的影响可以忽略不计。我们讨论了在最简单的Tangherlini时空模型中,当n>1时,强场引起的相对论象是否可以忽略。在强场极限下,计算了任意n的偏转角的发散部分和n=1,2,4的正则部分,在弱引力近似下,计算了任意n的偏转角。我们还比较了爱因斯坦环的半径与相对论性爱因斯坦环的半径。我们得出结论:强引力场中的像对总光变曲线的影响很小,当n>1时,即使考虑强引力场中的像,光变曲线中仍会出现时间对称的缩倍部分。

英文摘要:

The gravitational lensing effects in the weak gravitational field by exotic lenses have been investigated intensively to find nonluminous exotic objects. Gravitational lensing based on 1/r^n fall-off metric, as a one-parameter model that can treat by hand both the Schwarzschild lens (n=1) and the Ellis wormhole (n=2) in the weak field, has been recently studied. Only for n=1 case, however, it has been explicitly shown that effects of relativistic lens images by the strong field on the light curve can be neglected. We discuss whether relativistic images by the strong field can be neglected for n>1 in the Tangherlini spacetime which is one of the simplest models for our purpose. We calculate the divergent part of the deflection angle for arbitrary n and the regular part for n=1, 2 and 4 in the strong field limit, the deflection angle for arbitrary n under the weak gravitational approximation. We also compare the radius of the Einstein ring with the radii of the relativistic Einstein rings for arbitrary n. We conclude that the images in the strong gravitational field have little effect on the total light curve and that the time-symmetric demagnification parts in the light curve will appear even after taking account of the images in the strong gravitational field for n>1.

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