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Suppose that the early Universe starts with a cosmological $\Lambda$-termoriginating from quantum spacetime at the Planck scale. Dark energy drivesinflation and reheating by reducing its value for massive particle-antiparticlepairs production and oscillation, resulting in a holographic and massive pairplasma state. The back-and-forth reaction of dark energy and massive pairsslows inflation to its end and starts reheating by rapidly producing stable andunstable pairs. We introduce the Boltzmann-type rate equation describing theback-and-forth reaction. It forms a close set with Friedman equations andreheating equations for unstable pairs decay to relativistic particles. Thenumerical solutions show preheating, massive pairs dominated and genuinereheating episodes. We obtain the reheating temperature and entropy in terms ofthe tensor-to-scalar ratio $0 < r < 0.047$ consistently with observations.Stable massive pairs represent cold dark matter particles and weakly interactwith dark energy. The resultant cold dark matter abundance $\Omega_c\sim10^{-1}$ is about a constant in time.

Massive particle pair production and oscillation in Friedman Universe: reheating energy and entropy, and cold dark matter