Gravitational lensing in the strong field limit for Kar's metric
Carlos A. Benavides, Alejandro Cardenas-Avendano, Alexis Larranaga
TL;DR
This paper calculates the strong field gravitational lensing deflection angle for a scalar charged object in string theory, revealing discrepancies with Einstein frame results at first order.
Contribution
It provides the first calculation of strong field lensing in a string theory-derived metric and compares it with Einstein frame predictions, highlighting differences.
Findings
Strong field deflection angle computed for scalar charged objects
Discrepancies found between string theory and Einstein frame results at first order
Highlights importance of frame choice in gravitational lensing calculations
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.
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