Particle creation and decay in nonminimally coupled models of gravity

• Type: Article in International Scientific Journal
• Date: 2019

Authors

Azevedo, RPL (Author) Other; Avelino, PP (Author) FCUP

Journal

Title: Physical Review D

Vol. 99

ISSN: 2470-0010

Publisher: American Physical Society

Indexing

ISI Web of Knowledge - 10 Citations

Scopus - 11 Citations

Other information

Authenticus ID: P-00Q-BNM

DOI: 10.1103/physrevd.99.064027

Abstract (EN): In extended models of gravity, a nonminimal coupling to matter has been assumed to lead to irreversible particle creation. In this paper, we challenge this assumption. We argue that a nonminimal coupling of the matter and gravitational sectors results in a change in particle momentum on a cosmological time scale, irrespective of particle creation or decay. We further argue that particle creation or decay associated with a nonminimal coupling to gravity could only happen as a result of significant deviations from a homogeneous Friedmann-Lemaitre-Robertson-Walker geometry on microscopic scales and provide a phenomenological description of the impact of particle creation or decay on the cosmological evolution of the density of the matter fields.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 5