Do Relativistic Corrections Affect Microlensing Amplification?

概要

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Studies of gravitational microlensing are usually based on the lens equation, which is valid only to first order in the gravitational constant G. However, the amplification factor of microlensing is a second-order quantity with respect to G. Despite the fact, conventional studies are still based onthe lowest-order lens equation. Then the question naturally arises: Why are these conventional studies justified? We carefully study the relativistic correction to the amplification factor at O(G^2). We show that the amplification factor for each image is corrected. However, the total amplification remains unchanged at this order.
理論物理学刊行会の論文
2000-12-25