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gr-qc2025
On defining astronomically meaningful Reference Frames in General Relativity
L. Filipe O. Costa, Francisco Frutos-Alfaro, José Natário +1
In a recent paper we discussed when it is possible to define reference frames nonrotating with respect to distant inertial reference objects (extension of the IAU reference systems…
gr-qc2024★ 1 cited
Comment on "The Tully-Fisher law and dark matter effects derived via modified symmetries" by Arraut Ivan
L. Filipe O. Costa, F. Frutos-Alfaro, José Natário +1
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 th…