Do Relativistic Corrections Affect Microlensing Amplification? | Zendy

J. Ebina | Zendy; Takafumi Osuga | Zendy; Hideki Asada | Zendy; M. Kasai | Zendy

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Do Relativistic Corrections Affect Microlensing Amplification?

Author(s) -

J. Ebina,

Takafumi Osuga,

Hideki Asada,

M. Kasai

Publication year - 2000

Publication title -

progress of theoretical physics

Language(s) - English

Resource type - Journals

eISSN - 1347-4081

pISSN - 0033-068X

DOI - 10.1143/ptp.104.1317

Subject(s) - gravitational microlensing , physics , amplification factor , gravitational lens , order (exchange) , lens (geology) , astrophysics , quantum electrodynamics , theoretical physics , particle physics , stars , optics , galaxy , amplifier , optoelectronics , redshift , cmos , finance , economics

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 withrespect to $G$. Despite this fact, conventional studies are still based on thelowest-order lens equation. Then the question naturally arises: Why are theseconventional studies justified? We carefully study the relativistic correctionto the amplification factor at $O(G^2)$. We show that the amplification factorfor each image is corrected. However, the total amplification remains unchangedat this order.Comment: 4 pages (PTPTeX); accepted for publication in Prog. Theor. Phy

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