5 papers
The Hubble Tension in Light of the Symmetry of Scale Invariance
Frederic Courbin, Andre Maeder
When the expansion rate of the Universe at recombination is used to infer the present expansion rate , the value derived in the CDM model, km/s/mpc, is about in…
A Survey of Dynamical and Gravitational Lensing Tests in Scale Invariance: The Fall of Dark Matter?
Andre Maeder, Frederic Courbin
We first briefly review the adventure of scale invariance in physics, from Galileo Galilei, Weyl, Einstein, and Feynman to the revival by Dirac (1973) and Canuto et al. (1977). We…
Observational tests in scale invariance II: gravitational lensing
Andre Maeder, Frederic Courbin
We study the path of light rays passing near a massive object, in the context of the scale invariant equation of the geodesics first obtained by Dirac (1973). Using the exterior Sc…
Observational tests in scale invariance III: wide binary stars
Andre Maeder, Frederic Courbin
Recent studies of wide binary stars based on Gaia DR3 suggest that the relative orbital velocities of objects with separations s > 3'000 astronomical units are statistically larger…
Observational tests in scale invariance I: galaxy clusters and rotation of galaxies
Andre Maeder
Galaxy velocities in clusters, rotation curves of galaxies, and "vertical" oscillations in the Milky Way currently show too high velocities with respect to the masses thought to be…