Stability conditions for the Horndeski scalar field gravity model

• Type: Article in International Scientific Journal
• Date: 2022

Authors

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

Journal

Title: Journal of Cosmology and Astroparticle Physics

Vol. 2022

Final page: 008

ISSN: 1475-7516

Publisher: Institute of Physics Publishing

Indexing

ISI Web of Knowledge - 3 Citations

Scopus - 3 Citations

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 12