%0 Journal Article %T Negative Gravitational Mass: A Perfect Solution for Primordial Inflation and Dark Energy in the Early Universe %A St¨¦phane Le Corre %J Open Access Library Journal %V 9 %N 11 %P 1-25 %@ 2333-9721 %D 2022 %I Open Access Library %R 10.4236/oalib.1109473 %X This paper proposes a physical solution to primordial inflation. It occurs by a scalar field with a slow-rolling period. It starts at the phase transition giving rise to the gravitational interaction at time ti ~ 10-44 s, Planck time, and ends at time tf ~ 10-42 s (or more exactly about 70 e-folds later). This scalar field is carried by a primordial particle of inert mass mp ~ 10-8 kg, and size rp ~ 10-35 s. This mass and this time are compliant with the energy density expected at this date, namely 1019 GeV, obtained from the potential of this scalar field. This solution assumes the existence of particles with negative gravitational mass and positive inert mass, a hypothesis compatible with General Relativity. The incredible adequacy of this solution with what is expected and required by the theory of inflation appears as a strong indication of the validity of both this hypothesis of negative gravitational mass and that of primordial inflation. %K Cosmology %K Cosmic Inflation %K Dark Energy %K Negative Mass %U http://www.oalib.com/paper/6784393