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arXiv 1002.2056gr-qcastro-ph.CO
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f(R)引力场中强引力透镜的几何方法

A Geometrical Approach to Strong Gravitational Lensing in f(R) Gravity

Anne Marie Nzioki, Peter K. S. Dunsby, Rituparno Goswami, Sante Carloni

摘要:

我们提出了一个框架内的f(R)引力的球对称时空中的透镜的研究。对于任意的f(R)理论,我们导出了零测地线的传播方程,以及弯曲角的表达式,然后将其应用于R^n引力的精确球对称解。我们发现,在这种情况下,与GR相比,R^n引力理论预期会有更多的弯曲,并且依赖于n的值和入射零测地线的最近接近距离的值。

英文摘要:

We present a framework for the study of lensing in spherically symmetric spacetimes within the context of f(R) gravity. Equations for the propagation of null geodesics, together with an expression for the bending angle are derived for any f(R) theory and then applied to an exact spherically symmetric solution of R^n gravity. We find that for this case more bending is expected for R^n gravity theories in comparison to GR and is dependent on the value of n and the value of distance of closest approach of the incident null geodesic.

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