Observational constraints on finite scale factor singularities
  We discuss the combined constraints on a Finite Scale Factor Singularity
(FSF) universe evolution scenario, which come from the shift parameter R,
baryon acoustic oscillations (BAO) A, and from the type Ia supernovae. We show
that observations allow existence of such singularities in the 2x10^9 years, in
future, at the 1{\sigma} CL, and that at the present moment of the cosmic
evolution, one cannot differentiate between cosmological scenario which allow
finite scale factor singularities and the standard dark energy models. We also
show that there is an allowed value of m = 2/3 within 1{\sigma} CL, which
corresponds to a dust-filled Einstein-de-Sitter universe limit of the early
time evolution.
