Comment on "The Tully-Fisher law and dark matter effects derived via modified symmetries" by Arraut Ivan
arXiv:2402.00081 · doi:10.1209/0295-5075/ad2728
Abstract
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.
arXiv comment2 pages, no figures. Two minor typos in the text corrected, matches the final published version