Quantum Fluctuations and Particle Production of Coherently Oscillating Inflaton
Abstract
Description
We study a massive inflaton minimally coupled to the FRW Universe using the semiclassical gravity derived from canonical quantum gravity. It is found that the semiclassical quantum gravity leads to the power-law expansion $t^{2/3}$ in an oscillatory phase of the inflaton. The particle production of the inflaton in the expanding Universe restricts the duration of stable coherent oscillations and parametric resonance. The semiclassical gravity shows a significant difference that the Hubble constant does not oscillate in contrast with the oscillatory behavior in classical gravity.
ReVTeX, No Figures, 12 Pages, Reference added
ReVTeX, No Figures, 12 Pages, Reference added