Ultra-compact Objects of Non-minimally Coupled Dark Matter
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866914189744799744 |
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| author | Benetti, Francesco Lapi, Andrea Silveravalle, Samuele Liberati, Stefano |
| author_facet | Benetti, Francesco Lapi, Andrea Silveravalle, Samuele Liberati, Stefano |
| contents | In the framework of a collisionless dark matter fluid which is non-minimally coupled to gravity, we investigate the existence and properties of static, spherically symmetric solutions of the general relativistic field equations. We show that the non-minimal coupling originates an (anisotropic) pressure able to counteract gravity and to allow the formation of regular, horizonless ultra-compact objects of dark matter (NMC-UCOs). We then analyze the orbits of massive and massless particles in the gravitational field of NMC-UCOs, providing some specific example and a general discussion in terms of phase portraits. Finally, we study the gravitational lensing effects around NMC-UCOs, and effectively describe these in terms of a pseudo-shadow. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_07533 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Ultra-compact Objects of Non-minimally Coupled Dark Matter Benetti, Francesco Lapi, Andrea Silveravalle, Samuele Liberati, Stefano General Relativity and Quantum Cosmology In the framework of a collisionless dark matter fluid which is non-minimally coupled to gravity, we investigate the existence and properties of static, spherically symmetric solutions of the general relativistic field equations. We show that the non-minimal coupling originates an (anisotropic) pressure able to counteract gravity and to allow the formation of regular, horizonless ultra-compact objects of dark matter (NMC-UCOs). We then analyze the orbits of massive and massless particles in the gravitational field of NMC-UCOs, providing some specific example and a general discussion in terms of phase portraits. Finally, we study the gravitational lensing effects around NMC-UCOs, and effectively describe these in terms of a pseudo-shadow. |
| title | Ultra-compact Objects of Non-minimally Coupled Dark Matter |
| topic | General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2412.07533 |