Quick Search:

uzh logo
Browse by:

Zurich Open Repository and Archive

Maintenance: Tuesday, 5.7.2016, 07:00-08:00

Maintenance work on ZORA and JDB on Tuesday, 5th July, 07h00-08h00. During this time there will be a brief unavailability for about 1 hour. Please be patient.

Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-16760

Sereno, M; de Luca, F (2008). Primary caustics and critical points behind a Kerr black hole. Physical Review D, 78(2):023008.

Accepted Version
PDF (Accepted manuscript, Version 2)
View at publisher
Accepted Version
PDF (Accepted manuscript, Version 1)


The primary optical caustic surface behind a Kerr black hole is a four-cusped tube displaced from the line of sight. We derive the caustic surface in the nearly asymptotic region far from the black hole through a Taylor expansion of the lightlike geodesics up to and including fourth-order terms in m/b and a/b, where m is the
black hole mass, a the spin and b the impact parameter. The corresponding critical locus in the observer’s sky is elliptical and a point-like source inside the caustics will be imaged as an Einstein cross. With regard to lensing
near critical points, a Kerr lens is analogous to a circular lens perturbed by a dipole and a quadrupole potential.
The caustic structure of the supermassive black hole in the Galactic center could be probed by lensing of low
mass X-ray binaries in the Galactic inner regions or by hot spots in the accretion disk.


11 citations in Web of Science®
12 citations in Scopus®
Google Scholar™



153 downloads since deposited on 13 Mar 2009
23 downloads since 12 months

Detailed statistics

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute for Computational Science
Dewey Decimal Classification:530 Physics
Date:July 2008
Deposited On:13 Mar 2009 10:22
Last Modified:05 Apr 2016 13:07
Publisher:American Physical Society
Publisher DOI:10.1103/PhysRevD.78.023008
Related URLs:http://arxiv.org/abs/0710.5923v2

Users (please log in): suggest update or correction for this item

Repository Staff Only: item control page