Comment on "The Tully-Fisher law and dark matter effects derived via modified symmetries" by Arraut Ivan
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| Format: | Preprint |
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2024
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| _version_ | 1866929302882222080 |
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| author | Costa, L. Filipe O. Frutos-Alfaro, F. Natário, José Soffel, Michael |
| author_facet | Costa, L. Filipe O. Frutos-Alfaro, F. Natário, José Soffel, Michael |
| contents | It has been claimed in I. Arraut, 2023 EPL 144 29003 [arXiv:2311.05652] that General Relativity can generate effects equivalent to dark matter, based on a "new modified symmetry that emerges at galactic scale". We show that (i) the spacetime considered is unphysical, violating energy conditions everywhere; (ii) actually no new symmetry emerges, which results from incorrect definitions of angular momentum, velocity, and arclength in the proposed geometry; (iii) no Tully-Fisher law, or flat rotation curves are obtained either, they simply result from a series of errors in the equations. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2402_00081 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Comment on "The Tully-Fisher law and dark matter effects derived via modified symmetries" by Arraut Ivan Costa, L. Filipe O. Frutos-Alfaro, F. Natário, José Soffel, Michael General Relativity and Quantum Cosmology Astrophysics of Galaxies High Energy Physics - Theory It has been claimed in I. Arraut, 2023 EPL 144 29003 [arXiv:2311.05652] that General Relativity can generate effects equivalent to dark matter, based on a "new modified symmetry that emerges at galactic scale". We show that (i) the spacetime considered is unphysical, violating energy conditions everywhere; (ii) actually no new symmetry emerges, which results from incorrect definitions of angular momentum, velocity, and arclength in the proposed geometry; (iii) no Tully-Fisher law, or flat rotation curves are obtained either, they simply result from a series of errors in the equations. |
| title | Comment on "The Tully-Fisher law and dark matter effects derived via modified symmetries" by Arraut Ivan |
| topic | General Relativity and Quantum Cosmology Astrophysics of Galaxies High Energy Physics - Theory |
| url | https://arxiv.org/abs/2402.00081 |