Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-05-09
Gen.Rel.Grav.39:583-600,2007
Astronomy and Astrophysics
Astrophysics
8 pages, RevTex, 1 eps figures; discussion improved; typos corrected; references added
Scientific paper
10.1007/s10714-007-0407-5
We consider the metric exterior to a charged dilaton black hole in a de Sitter universe. We study the motion of a test particle in this metric. Conserved quantities are identified and the Hamilton-Jacobi method is employed for the solutions of the equations of motion. At large distances from the black hole the Hubble expansion of the universe modifies the effective potential such that bound orbits could exist up to an upper limit of the angular momentum per mass for the orbiting test particle. We then study the phenomenon of strong field gravitational lensing by these black holes by extending the standard formalism of strong lensing to the non-asymptotically flat dilaton-de Sitter metric. Expressions for the various lensing quantities are obtained in terms of the metric coefficients.
Majumdar Archan S.
Mukherjee Nupur
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