Denne korte artikel gør opmærksom på, at McGaughs relation mellem den målte radiale acceleration i skivegalakser og den beregnede acceleration ud fra stjerner og gas kan forklares som et resultat af dissipativ gasdynamik i en standard ΛCDM-kosmologi; men dette bliver sikkert ikke afslutningen på denne sag.
ABSTRACT: Recent analysis (McGaugh et al. 2016) of the SPARC galaxy sample found a surprisingly tight relation between the radial acceleration inferred from the rotation curves, and the acceleration due to the baryonic components of the disc. It has been suggested that this relation may be evidence for new physics, beyond ΛCDM . In this letter we show that the 18 galaxies from the MUGS2 match the SPARC acceleration relation. These cosmological simulations of star forming, rotationally supported discs were simulated with a WMAP3 ΛCDM cosmology, and match the SPARC acceleration relation with less scatter than the observational data. These results show that this acceleration law is a consequence of dissipative collapse of baryons, rather than being evidence for exotic dark-sector physics or new dynamical laws.