Equatorial and quasi-equatorial gravitational lensing by Kerr black hole pierced by a cosmic string

Details Equatorial and quasi-equatorial gravitational lensing by Kerr black hole pierced by a cosmic string Equatorial and quasi-equatorial gravitational lensing by Kerr black hole pierced by a cosmic string

2011-07-15

arxiv.org/abs/1107.3023v3

Phys. Rev. D85 (2012) 064044

Physics

High Energy Physics

High Energy Physics - Theory

29 pages, 9 figures

Scientific paper

10.1103/PhysRevD.85.064044

In the present paper, we study numerically the equatorial lensing and quasiequatorial lensing by Kerr black hole pierced by a cosmic string in the strong deflection limit. We calculate the strong deflection limit coefficients and the deflection angle, which are found to depend closely on the cosmic string parameter $\beta$ and dimensionless spin $a_{*}$. The magnification and positions of relativistic images are also computed in the strong deflection limit and a two-dimensional lens equation is derived. The most important and outstanding effect is that the caustics drift away from the optical axis and shift in the clockwise direction with respect to the Kerr black hole. For fixed $a_{*}$ of the black hole, the caustics drift farther away from the optical axis for a large value of $\beta$. And for fixed $\beta$, they drift farther for high $a_{*}$. We also obtain the intersections of the critical curves with the equatorial plane, which decrease with $a_{*}$ and $\beta$. In particular, we obtain a quantity $\bar{\mu}_{k+1}/\bar{\mu}_{k}$, which is independent of the black hole spin and mass. Thus, through measuring it, one is allowed to determine the value of $\beta$ from astronomical observations.

Affiliated with

Also associated with

No associations

Rating

Equatorial and quasi-equatorial gravitational lensing by Kerr black hole pierced by a cosmic string does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Equatorial and quasi-equatorial gravitational lensing by Kerr black hole pierced by a cosmic string, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Equatorial and quasi-equatorial gravitational lensing by Kerr black hole pierced by a cosmic string will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-226108