Testing Extended General Relativity with galactic sizes and compact
  gravitational sources
  Considering a five-dimensional (5D) Riemannian spacetime with a particular
stationary Ricci-flat metric, we have applied the recently developed Extended
General Relativistic theory to calculate the lower limit for the size of some
relevant galaxies: the Milky Way, Andromeda and M87. Our results are in very
good agreement with observations.
