Gravitational lensing in the strong field limit for Kar's metric

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.

v3: 18 pages, 5 figures, references and an Appendix added

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• Gravitational lensing around Kehagias-Sfetsos compact objects surrounded by plasma