Derives a factorized leading term for the strong deflection angle near degenerate photon spheres using local expansion of the effective potential and Weyl tensor measures.
Gravitational lensing by a regular black hole
3 Pith papers cite this work. Polarity classification is still indexing.
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abstract
In this paper, we study a regular Bardeen black hole as a gravitational lens. We find the strong deflection limit for the deflection angle, from which we obtain the positions and magnifications of the relativistic images. As an example, we apply the results to the particular case of the supermassive black hole at the center of our galaxy.
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gr-qc 3years
2026 3verdicts
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A conformal isothermal reformulation of optical geometry converts the Gauss-Bonnet area term for weak deflection into boundary integrals evaluated on a flat reference ray, reproducing known finite-distance results for Schwarzschild, Reissner-Nordström, and Kottler spacetimes.
A new ghost-free Born-Infeld-type f(R, G) gravity is built that admits a large family of bouncing cosmologies with varied asymptotic behaviors.
citing papers explorer
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Strong-deflection expansion of the deflection angle near a degenerate photon sphere
Derives a factorized leading term for the strong deflection angle near degenerate photon spheres using local expansion of the effective potential and Weyl tensor measures.
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Boundary-only weak deflection angles from isothermal optical geometry
A conformal isothermal reformulation of optical geometry converts the Gauss-Bonnet area term for weak deflection into boundary integrals evaluated on a flat reference ray, reproducing known finite-distance results for Schwarzschild, Reissner-Nordström, and Kottler spacetimes.
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Bouncing cosmologies from Born-Infeld-type gravity
A new ghost-free Born-Infeld-type f(R, G) gravity is built that admits a large family of bouncing cosmologies with varied asymptotic behaviors.