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A model of a universe without big bang singularity is presented, whichdisplaysanearly inflationary period ending just before a phase transition to adeflationary epoch. The model produces enough heavy particles so as to reheatthe universe at temperatures in the MeV regime. After the reheating, itsmoothly matches the standard $\Lambda$CDM scenario.

Inflation and late-time acceleration from a double-well potential with cosmological constant