Bounding the Cosmological Constant using Galactic Rotation Curves from the SPARC Dataset
arXiv:2405.16650 · doi:10.1103/PhysRevD.110.063028
Abstract
Dark energy (and its simplest model, the Cosmological Constant or ) acts as a repulsive force that opposes gravitational attraction. Assuming galaxies maintain a steady state over extended periods, the estimated upper limit on studies its pushback to the attractive gravitational force of dark matter. From the SPARC dataset, we select galaxies that are best fitted by the Navarro-Frenk-White (NFW) and Hernquist density models. Introducing the presence of in these galaxies helps to establish the upper limit on its repulsive force. This upper limit on is around ~kg/m, only two orders of magnitude higher than the one measured by Planck. {We show that for galaxies with detectable velocities far from the galaxy core, the upper limit on is lower. Furthermore, we show that galaxies and other systems follow the same principle: for larger orbital periods the upper limit on is lower. Consequently, we address the implications for future measurements on the upper limit and the condition for detecting the impact of on galactic scales.
arXiv comment9 pages; 7 figures; Modified version;
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