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Advances in High Energy Physics
Volume 2015, Article ID 635625, 9 pages
Research Article

Null Geodesics and Strong Field Gravitational Lensing in a String Cloud Background

1Department of Mathematics, University of the Punjab, Quaid-e-Azam Campus, Lahore 54590, Pakistan
2Department of Mathematics, Lahore College for Women University, Lahore 54000, Pakistan

Received 2 March 2015; Accepted 1 May 2015

Academic Editor: Juan José Sanz-Cillero

Copyright © 2015 M. Sharif and Sehrish Iftikhar. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The publication of this article was funded by SCOAP3.


This paper is devoted to studying two interesting issues of a black hole with string cloud background. Firstly, we investigate null geodesics and find unstable orbital motion of particles. Secondly, we calculate deflection angle in strong field limit. We then find positions, magnifications, and observables of relativistic images for supermassive black hole at the galactic center. We conclude that string parameter highly affects the lensing process and results turn out to be quite different from the Schwarzschild black hole.