arXiv Astrophysics#science
Bounds on $\Lambda$ at the Galactic Centertranslating…
Factuality: 70/100UnknownarXiv Media House
arXiv:2606.13356v1 Announce Type: cross
Abstract: We constrain the cosmological constant $\Lambda$ using astrometric and spectroscopic observations of the S2, S1, and S14 stars orbiting Sgr A$^*$. The stellar motion is modelled by numerically integrating timelike geodesics in Schwarzschild-de Sitter spacetime, including relativistic redshift and time-delay corrections. Orbital and spacetime parameters are inferred using a Bayesian MCMC analysis. The resulting posterior distributions place upper