Quantum Inflaton Dynamics

TL;DR

This paper demonstrates that the quantum dynamics of a scalar field during early universe inflation can be modeled by a two-dimensional nonlinear system, revealing how quantum fluctuations influence inflationary behavior.

Contribution

It introduces a novel approach to describe quantum inflaton dynamics using a two-dimensional nonlinear system with angular momentum, incorporating nonperturbative quantum effects.

Findings

Gaussian states with large quantum fluctuations explain early inflation features

Quantum contributions significantly impact inflationary dynamics

Model provides a new framework for quantum cosmology studies

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.