Warm Inflation in the Adiabatic Regime- a Model, an Existence Proof for Inflationary Dynamics in Quantum Field Theory

TL;DR

This paper explores warm inflation within a multi-field quantum field theory framework, demonstrating solutions for expansion and perturbations in an adiabatic regime, and discusses its particle physics implications.

Contribution

It provides an existence proof for inflationary dynamics in quantum field theory under adiabatic, near-equilibrium conditions with a large number of fields.

Findings

Solutions for e-folds and density perturbations are obtained.

The model is consistent with observations in the adiabatic regime.

Requires a large number of fields (>10^4) for particle physics compatibility.

Abstract

Warm inflation is examined in a multi-field model. Solutions are obtained for expansion e-folds and scalar density perturbations. Nonequilibrium dynamics is restricted to a regime that is displaced only slightly from thermal equilibrium and in which all macroscopic motion is adiabatic. In such a regime, nonequilibrium dynamics is well defined, provided macroscopic motions that displace the thermal equilibrium state occur sufficiently slow. The solution has adjustable parameters that permit observational consistency with respect to expansion e-folds and density perturbations in the full adiabatic regime, thus insuring a valid solution regime. For particle physics, the model is nonstandard since it requires a large number of fields, $> 10^4$. A particle physics/string interpretation of the model and solutions is discussed, which can accommodate the large field number requirement.