
TL;DR
Warm inflation introduces classical primordial perturbations and concurrent particle production during inflation, with models that address key inflationary challenges and are supported by quantum field theory, offering a promising avenue for cosmological research.
Contribution
This review synthesizes the development of warm inflation, emphasizing its dynamics derived from quantum field theory and its potential to resolve inflation model building issues.
Findings
Warm inflation allows for inflaton masses larger than the Hubble scale.
It enables sub-Planckian inflaton field excursions.
The approach integrates quantum field theory to compute dissipative effects.
Abstract
Warm inflation has normalized two ideas in cosmology, that in the early universe the initial primordial density perturbations generally could be of classical rather than quantum origin and that during inflation, particle production from interactions amongst quantum field, and its backreaction effects, can occur concurrent with inflationary expansion. When we first introduced these ideas, both were met with resistance, but today they are widely accepted as possibilities with many models and applications based on them, which is an indication of the widespread influence of warm inflation. Open quantum field theory, which has been utilized in studies of warm inflation, is by now a relevant subject in cosmology, in part due to this early work. In this review I first discuss the basic warm inflation dynamics. I then outline how to compute warm inflation dynamics from first principles quantum…
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Taxonomy
TopicsCosmology and Gravitation Theories · Black Holes and Theoretical Physics · Dark Matter and Cosmic Phenomena
