{\Lambda} CDM is Consistent with SPARC Radial Acceleration Relation
Abstract
Recent analysis \citep{McGaugh2016} 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 $\Lambda CDM$. In this letter we show that 32 galaxies from the MUGS2
match the SPARC acceleration relation. These cosmological simulations of star
forming, rotationally supported discs were simulated with a {\sc WMAP3}
$\Lambda CDM$ cosmology, and match the SPARC acceleration relation with less
scatter than the observational data. These results show that this acceleration
relation is a consequence of dissipative collapse of baryons, rather than being
evidence for exotic dark-sector physics or new dynamical laws.