Derives the far-field light deflection angle for the Kerr-Sen black hole by constructing a refractive index that includes frame-dragging and compares the result to Kerr and Schwarzschild cases in general relativity.
Sen, A more exact expression for the gravitational deflection of light, derived using material medium ap- proach, Astrophysics 53, 560 (2010)
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Deflection of Light due to Kerr Sen Black Hole in Heterotic String Theory using Material Medium Approach
Derives the far-field light deflection angle for the Kerr-Sen black hole by constructing a refractive index that includes frame-dragging and compares the result to Kerr and Schwarzschild cases in general relativity.