  The most important criteria for a successful inflation are to explain the
observed temperature anisotropy in the cosmic microwave background radiation,
and exiting inflation in a vacuum where it can excite the Standard Model quarks
and leptons required for the success of Big Bang Nucleosynthesis. In this paper
we provide the first ever closed string model of inflation where the inflaton
couplings to hidden sector, moduli sector, and visible sector fields can be
computed, showing that inflation can lead to reheating the Standard Model
degrees of freedom before the electro-weak scale.
