A force proportional to velocity squared derived from spacetime algebra
  The underlying geometri of spacetime algebra allows one to derive a force by
contracting the relativistic generalization of angular momentum, M, with the
mass-current, mw, where w is a proper 4-vector velocity. By applying this force
to a cosmological object, a repulsive inverse distance-square law is found,
which is proportional to the velocity dispersion squared of that structure. It
is speculated if this finding may be relevant to the recent suggestion, that
such a force may accelerate the expanding universe with no need for a
cosmological constant.
