Gravitational lensing by $k-n$ generalized black-bounce space-times
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arXiv
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| Hauptverfasser: | , , , , |
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| Format: | Preprint |
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2025
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| author | Furtado, C. Moreira, A. L. A. Nascimento, J. R. Petrov, A. Yu. Porfirio, P. J. |
| author_facet | Furtado, C. Moreira, A. L. A. Nascimento, J. R. Petrov, A. Yu. Porfirio, P. J. |
| contents | We study gravitational lensing by $k-n$ generalized black-bounce space-times both in regimes of weak and strong field approximations. These metrics interpolate between regular black holes and one-way or traversable wormholes. First, we investigate the light-like geodesic trajectories and derive an analytical expression for the deflection angle in terms of the bounce parameter in the weak-field gravitational regime. We then turn to the strong-field gravitational regime and display the behavior of the bending angle as a function of both the impact parameter and the bounce parameter. Next, using the lens equations, we analyze how the observables for \textit{Sagittarius} A* behave concerning the bounce parameter. We obtain the shadow's radii for some black-bounce metrics and plot the graph of their sizes, comparing them with the Schwarzschild one. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_19920 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Gravitational lensing by $k-n$ generalized black-bounce space-times Furtado, C. Moreira, A. L. A. Nascimento, J. R. Petrov, A. Yu. Porfirio, P. J. General Relativity and Quantum Cosmology We study gravitational lensing by $k-n$ generalized black-bounce space-times both in regimes of weak and strong field approximations. These metrics interpolate between regular black holes and one-way or traversable wormholes. First, we investigate the light-like geodesic trajectories and derive an analytical expression for the deflection angle in terms of the bounce parameter in the weak-field gravitational regime. We then turn to the strong-field gravitational regime and display the behavior of the bending angle as a function of both the impact parameter and the bounce parameter. Next, using the lens equations, we analyze how the observables for \textit{Sagittarius} A* behave concerning the bounce parameter. We obtain the shadow's radii for some black-bounce metrics and plot the graph of their sizes, comparing them with the Schwarzschild one. |
| title | Gravitational lensing by $k-n$ generalized black-bounce space-times |
| topic | General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2504.19920 |