An explanation for galaxy rotation curves using a Clifford multivector   spacetime framework
  We explore the consequences of space and time described within the Clifford multivector of three dimensions $ Cl_{3,0}$, where space consists of three-vectors and time is described with the three bivectors of this space. When describing the curvature around massive bodies, we show that this model of spacetime when including the Hubble expansion naturally produces the correct galaxy rotation curves without the need for dark matter. 
James M.Chappell, Nicolangelo Iannella, Azhar Iqbal and Derek Abbott
math-ph gr-qc math.MP