Strong gravitational lensing by Kerr-Sen dilaton-axion black hole

Details Strong gravitational lensing by Kerr-Sen dilaton-axion black hole Strong gravitational lensing by Kerr-Sen dilaton-axion black hole

Apr 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aipc..899..145g&link_type=abstract

SIXTH INTERNATIONAL CONFERENCE OF THE BALKAN PHYSICAL UNION. AIP Conference Proceedings, Volume 899, pp. 145-146 (2007).

Physics

Relativity And Gravitation, Gravitational Lenses And Luminous Arcs, Black Holes, Galactic Nuclei, Circumnuclear Matter, And Bulges

Scientific paper

In the present work we study strong field limit, quasi-equatorial lensing by the charged, stationary, axially-symmetric Kerr-Sen dilaton-axion black hole. The most outstanding effect is that the Kerr-Sen black hole caustics drift away from the optical axis and shift in clockwise direction. The intersections of the critical curves on the equatorial plane as a function of the black hole angular momentum are found and it is showed that they decrease with the metric parameter Q2 / M. The magnifying power of the lens is shown.

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