Red/Blue shifts of photons in a Hayward black hole immersed in perfect fluid dark matter
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866911710567202816 |
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| author | López, L. Marlene. López, L. A. |
| author_facet | López, L. Marlene. López, L. A. |
| contents | We investigate the red/blue shifts of photons emitted by particles moving along stable circular orbits around a Hayward regular black hole immersed in perfect fluid dark matter (PFDM). The PFDM contribution modifies the horizon structure and shifts the characteristic radii associated with circular motion, including the photon sphere and the ISCO radius. We show that the redshift reaches its minimum in the pure Hayward case and increases for nonzero values of the PFDM parameter, whereas the blueshift exhibits the opposite behavior. We also analyze the black hole shadow and compare the results with the observational constraints from Sgr A*. Positive values of the PFDM parameter reduce the shadow radius, while negative values produce larger deviations from the Schwarzschild case. These results suggest that frequency shifts and black hole shadows may provide observational signatures of PFDM effects in strong gravitational fields. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2605_24102 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Red/Blue shifts of photons in a Hayward black hole immersed in perfect fluid dark matter López, L. Marlene. López, L. A. General Relativity and Quantum Cosmology We investigate the red/blue shifts of photons emitted by particles moving along stable circular orbits around a Hayward regular black hole immersed in perfect fluid dark matter (PFDM). The PFDM contribution modifies the horizon structure and shifts the characteristic radii associated with circular motion, including the photon sphere and the ISCO radius. We show that the redshift reaches its minimum in the pure Hayward case and increases for nonzero values of the PFDM parameter, whereas the blueshift exhibits the opposite behavior. We also analyze the black hole shadow and compare the results with the observational constraints from Sgr A*. Positive values of the PFDM parameter reduce the shadow radius, while negative values produce larger deviations from the Schwarzschild case. These results suggest that frequency shifts and black hole shadows may provide observational signatures of PFDM effects in strong gravitational fields. |
| title | Red/Blue shifts of photons in a Hayward black hole immersed in perfect fluid dark matter |
| topic | General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2605.24102 |