Stability conditions for the Horndeski scalar field gravity model

• Tipo: Artigo em Revista Científica Internacional
• Data: 2022

Autores

Gomes, C (Autor) FCUP; Bertolami, O (Autor) FCUP

Revista

Título: Journal of Cosmology and Astroparticle Physics

Vol. 2022

Página Final: 008

ISSN: 1475-7516

Editora: Institute of Physics Publishing

Indexação

ISI Web of Knowledge - 3 Citações

Scopus - 3 Citações

Outras Informações

ID Authenticus: P-00W-BPF

DOI: 10.1088/1475-7516/2022/04/008

Abstract (EN): We constrain the viable models of Horndeski gravity, written in its equivalent Generalised Galileon version, by resorting to the Witten positive energy theorem. We find that the free function G(3)(phi, X) in the Lagrangian is constrained to be a function solely of the scalar field, G(3)(phi), and relations among the free functions are found. Other criterion for stability are also analysed, such as the attractiveness of gravity, and the Dolgov-Kawasacki instability. Some applications for cosmology are discussed.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 12