Cosmological gravitational particle production and its implications for cosmological relics
Abstract
Cosmological gravitational particle production (CGPP) is the creation of particles in an expanding universe due solely to their gravitational interaction. These particles can play an important role in the cosmic history through their connection to various cosmological relics including dark matter, gravitational wave radiation, dark radiation, and the baryon asymmetry. This review explains the phenomenon of CGPP as a consequence of quantum fields in a time-dependent background, catalogs known results for the spectra and cosmological abundance of gravitationally produced particles of various spins, and explores the phenomenological consequences and observational signatures of CGPP.
Keywords
Cite
@article{arxiv.2312.09042,
title = {Cosmological gravitational particle production and its implications for cosmological relics},
author = {Edward W. Kolb and Andrew J. Long},
journal= {arXiv preprint arXiv:2312.09042},
year = {2025}
}
Comments
51 pages + references; invited article for Reviews of Modern Physics; v2 - matches published version