PIRSA:25120024 Scientific Series Particle Physics

DOI10.48660/25120024

Series: Particle Physics

Broadberry, E. (2025). A simple guide to warm inflation model building. Perimeter Institute. https://pirsa.org/25120024

Broadberry, Edward. A simple guide to warm inflation model building. Perimeter Institute, Dec. 05, 2025, https://pirsa.org/25120024 

@misc{ pirsa_PIRSA:25120024,
  doi = {10.48660/25120024},
  url = {https://pirsa.org/25120024},
  author = {Broadberry, Edward},
  keywords = {Particle Physics},
  language = {en},
  title = {A simple guide to warm inflation model building},
  publisher = {Perimeter Institute},
  year = {2025},
  month = {dec},
  note = {PIRSA:25120024 see, \url{https://pirsa.org}}
}

Abstract

Inflaton couplings during warm inflation result in the production of a thermal bath. Thermal fluctuations can dominate the standard de Sitter analogues, resulting in a modified slow-roll scenario with a new source of density fluctuations. It is generally difficult to reliably calculate the predictions of warm inflation, and therefore assess its viability as a model of the early universe. We will present a fully calculable perturbative model of warm inflation, and discuss its main features. We will see that the thermal bath develops a chemical potential. The chemical potential has a rather large impact, and in extreme cases the chemical potential can stop warm inflation from happening all together.

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