Inflation and late-time acceleration from a double-well potential with
  cosmological constant
  A model of a universe without big bang singularity is presented, which
displaysanearly inflationary period ending just before a phase transition to a
deflationary epoch. The model produces enough heavy particles so as to reheat
the universe at temperatures in the MeV regime. After the reheating, it
smoothly matches the standard $\Lambda$CDM scenario.
