Strong field gravitational lensing in scalar tensor theories

Details Strong field gravitational lensing in scalar tensor theories Strong field gravitational lensing in scalar tensor theories

2006-02-22

arxiv.org/abs/gr-qc/0602087v2

Class.Quant.Grav.23:6101-6113,2006

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

20 pages, accepted in Class. Quantum Grav., final version

Scientific paper

10.1088/0264-9381/23/22/002

Strong field gravitational lensing in the Brans-Dicke theory has been studied. The deflection angle for photons passing very close to the photon sphere is estimated for the static spherically symmetric space-time of the theory and the position and magnification of the relativistic images are obtained. Modeling the super massive central object of the galaxy by the Brans-Dicke space-time, numerical values of different strong lensing observable are estimated. It is found that against the expectation there is no significant scalar field effect in the strong field observable lensing parameters. This observation raises question on the potentiality of the strong field lensing to discriminate different gravitational theories.

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