On asymptotic behaviour of galactic rotation curves in superfluid vacuum
  theory
  The logarithmic superfluid theory of physical vacuum predicts that gravity is
an induced phenomenon, which has a multiple-scale structure. At astronomical
scales, as the distance from a gravitating center increases, gravitational
potential and corresponding spacetime metric are dominated by a Newtonian
(Schwarzschild) term, followed by a logarithmic term, finally by linear and
quadratic (de Sitter) terms. Correspondingly, rotation curves are predicted to
be Keplerian in the inner regions of galaxies, mostly flat in the outer
regions, and non-flat in the utmost outer regions. We compare theory's
predictions with the furthest rotation curves data points available for a
number of galaxies: using a two-parameter fit, we perform a preliminary
estimate which disregards the combined effect of gas and stellar disc, but is
relatively simple and uses minimal assumptions for galactic luminous matter.
The data strongly points out at the existence of a crossover transition from
flat to non-flat regimes at galactic outskirts.
