Black Hole Gravitational Lensing in the Strong Field Limit

Physics

Scientific paper

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Scientific paper

We introduce an analytical approximation to study black hole gravitational lensing in the strong field limit. It turns out that the deflection angle follows a universal formula for all types of spherically symmetric black holes. Different metrics can be distinguished by the reconstruction of the coefficients appearing in this formula. In spinning black holes the phenomenology is different because of caustic dragging and stretching to extended diamond-shapes. The time delay measurement would provide a very precise distance estimate of the lens.

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