The warm inflationary universe

TL;DR

This paper discusses warm inflation, emphasizing the role of dissipation and fluctuations in inflationary dynamics, their quantum field theory origins, and potential observational signatures, bridging cosmology and particle physics.

Contribution

It provides a comprehensive review of warm inflation, highlighting its theoretical foundations and potential observational tests, advancing understanding beyond traditional inflation models.

Findings

Dissipative processes can leave observable signatures in the cosmic microwave background.

Quantum field theory approaches underpin the understanding of warm inflation mechanisms.

Warm inflation offers a viable alternative to standard inflation with distinct predictions.

Abstract

In the past decade, the importance of dissipation and fluctuation to inflationary dynamics has been realized and has led to a new picture of inflation called warm inflation. Although these phenomena are common to condensed matter systems, for inflation models their importance has only recently started to be appreciated. The article describes the motivation for these phenomenon during inflation and then examines their origins from first principles quantum field theory treatments of inflation models. Cosmology today is a data intensive field and this is driving theory to greater precision and predictability. This opens the possibility to consider tests for detecting observational signatures of dissipative processes, which will be discussed. In addition it will be discussed how particle physics and cosmology are now working in tandem to push the boundaries of our knowledge about fundamental physics.