Null Geodesics and Strong Field Gravitational Lensing of Black Hole with Global Monopole

We study two interesting features of a black hole with an ordinary as well as phantom global monopole. Firstly, we investigate null geodesics which imply unstable orbital motion of particles for both cases. Secondly, we evaluate deflection angle in strong field regime. We then find Einstein rings, m...

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Bibliographic Details
Published in:Advances in high energy physics 2015-01, Vol.2015 (2015), p.1-11
Main Authors: Sharif, M., Iftikhar, Sehrish
Format: Article
Language:English
Subjects:
Accretion disks
Black holes
Cosmology
Dark energy
Gravity
Light
Studies
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Summary:We study two interesting features of a black hole with an ordinary as well as phantom global monopole. Firstly, we investigate null geodesics which imply unstable orbital motion of particles for both cases. Secondly, we evaluate deflection angle in strong field regime. We then find Einstein rings, magnifications, and observables of the relativistic images for supermassive black hole at the center of galaxy NGC4486B. We also examine time delays for different galaxies and present our results numerically. It is found that the deflection angle for ordinary/phantom global monopole is greater/smaller than that of Schwarzschild black hole. In strong field limit, the remaining properties of these black holes are quite different from the Schwarzschild black hole.
ISSN:1687-7357
1687-7365
DOI:10.1155/2015/854264