Quantum Inflaton Dynamics

Abstract

We show that the quantum dynamics of a real scalar field for a large class of potentials in the symmetric Gaussian state, where the nonperturbative quantum contributions are taken into account, can be described equivalently by a two-dimensional nonlinear dynamical system with a definite angular momentum (U(1) charge of a complex theory). It is found that the Gaussian state with a nearly minimal uncertainty and a large quantum fluctuation, as an initial condition, naturally explains the most of the essential features of the early stage of the inflationary Universe.

8 pages, revTeX, no figures

References in corpus (3)

• Simplest cosmological model with the scalar field
• Perturbative Expansion around the Gaussian Effective Action: The Background Field Method
• Coherence and Emergence of Classical Spacetime

Cited by in corpus (5)

• Nonequilibrium Quantum Dynamics of Second Order Phase Transitions
• Density Fluctuations in the Oscillatory Phase of Nonclassical Inflaton in FRW Universe
• Particle creation in the oscillatory phase of inflaton
• Squeezed Thermal State Representation of the Inflaton and Particle Production in Bianchi type-I Universe
• Quantum Remnant as Dark Energy and Dark Matter