2 papers
gr-qc2025
Can Relativistic Effects explain Galactic Dynamics without Dark Matter?
L. Filipe O. Costa, José Natário
We show that, contrary to some recent claims, relativistic effects cannot mimic dark matter in the galactic rotation curves and gravitational lensing.
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…