International Journal of Theoretical Physics

, Volume 55, Issue 4, pp 2219–2236 | Cite as

Gravitational Lensing in the Strong Field Limit for Kar’s Metric

  • Carlos A. Benavides
  • Alejandro Cárdenas-Avendaño
  • Alexis Larranaga
Article

Abstract

In this paper we calculate the strong field limit deflection angle for a light ray passing near a scalar charged spherically symmetric object, described by a metric which comes from the low-energy limit of heterotic string theory. Then, we compare the expansion parameters of our results with those obtained in the Einstein’s canonical frame, obtained by a conformal transformation, and we show that, at least at first order, the results do not agree.

Keywords

Physics of black holes Strong lensing Photon sphere 

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Carlos A. Benavides
    • 1
  • Alejandro Cárdenas-Avendaño
    • 2
  • Alexis Larranaga
    • 1
  1. 1.Universidad Nacional de ColombiaBogotáColombia
  2. 2.Fundacion Universitaria Konrad LorenzBogotáColombia

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