Particle creation and decay in nonminimally coupled models of gravity

• Tipo: Artigo em Revista Científica Internacional
• Data: 2019

Autores

Azevedo, RPL (Autor) Outra; Avelino, PP (Autor) FCUP

Revista

Título: Physical Review D

Vol. 99

ISSN: 2470-0010

Editora: American Physical Society

Indexação

ISI Web of Knowledge - 10 Citações

Scopus - 11 Citações

Outras Informações

ID Authenticus: 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 5