Analytical Kerr-Sen dilaton-axion black hole lensing in the weak deflection limit

Journal Article · Fri Jan 15 04:00:00 EST 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.81.023005· OSTI ID:21409029

Gyulchev, Galin N; Yazadjiev, Stoytcho S ^[1]

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1. Department of Theoretical Physics, Faculty of Physics, Sofia University, 5 James Bourchier Boulevard, 1164 Sofia (Bulgaria)

We investigate analytical gravitational lensing by charged, stationary, axially symmetric Kerr-Sen dilaton-axion black holes in the weak-deflection limit. Approximate solutions to the lightlike equations of motion are present up to and including third-order terms in M/b, a/b, and r{sub {alpha}/}b, where M is the black hole mass, a is the angular momentum, r{sub {alpha}=}Q{sup 2}/M, Q being the charge and b is the impact parameter of the light ray. We compute the positions of the two weak field images, the corresponding signed and absolute magnifications up to post-Newtonian order. It is shown that there are static post-Newtonian corrections to the signed magnification and their sum as well as to the critical curves, which are functions of the charge. The shift of the critical curves as a function of the lens angular momentum is found, and it is shown that they decrease slightly with the increase of the charge. The pointlike caustics drift away from the optical axis and do not depend on the charge. All of the lensing quantities are compared to particular cases as Schwarzschild and Kerr black holes as well as the Gibbons-Maeda-Garfinkle-Horowitz-Strominger black hole.

• OSTI ID: 21409029
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 2 Vol. 81; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
79 ASTRONOMY AND ASTROPHYSICS
ANGULAR MOMENTUM
APPROXIMATIONS
AXIAL SYMMETRY
BLACK HOLES
CALCULATION METHODS
COMPUTERIZED SIMULATION
CORRECTIONS
DIFFERENTIAL EQUATIONS
EQUATIONS
EQUATIONS OF MOTION
GRAVITATIONAL FIELDS
GRAVITATIONAL LENSES
IMPACT PARAMETER
KERR FIELD
LENSES
MASS
MATHEMATICAL SOLUTIONS
METRICS
PARTIAL DIFFERENTIAL EQUATIONS
SCHWARZSCHILD METRIC
SIMULATION
SYMMETRY