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We propose a complete cosmological scenario based on a flipped SU(5) $\times$U(1) GUT model that incorporates Starobinsky-like inflation, taking thesubsequent cosmological evolution carefully into account. A single mastercoupling, $\lambda_6$, connects the singlet, GUT Higgs and matter fields,controlling 1) inflaton decays and reheating, 2) the gravitino production rateand therefore the non-thermal abundance of the supersymmetric cold dark matterparticle, 3) neutrino masses and 4) the baryon asymmetry of the Universe.

Cosmology with a Master Coupling in Flipped SU(5) $\times$ U(1): The $\lambda_6$ Universe