Linear potentials in galaxy halos by Asymmetric Wormholes
  A spherically symmetric space-time solution for a diffusive two measures
theory is studied. An asymmetric wormhole geometry is obtained where the metric
coefficients have a linear term for galactic distances and the analysis of
Mannheim and collaborators, can then be used to describe the galactic rotation
curves. For cosmological distances, a de-Sitter space-time is realized. Centre
of gravity coordinates for the wormhole is introduced which are the most
suitable for the collective motion of a wormhole. The wormholes connect
universes with different vacuum energy densities which may represent different
universes in a "landscape scenario". The metric coefficients depend on the
asymmetric wormhole parameters. The coefficient of the linear potential is
proportional to both the mass of the wormhole and the cosmological constant of
the observed universe. Similar results are also expected in other theories like
$k$-essence theories, that may support wormholes.
