Horndeski dark matter and beyond

Starting from the Gleyzes-Langlois-Piazza-Vernizzi action, we derive the most general effective theory that is invariant under internal shifts and a Z2 mirror symmetry in the scalar sector. Contrary to what one may think, this model presents a dark matter tracker previous to the dark energy dominati...

Full description

Saved in:
Bibliographic Details
Published in:Physical review. D 2018-06, Vol.97 (12), Article 123524
Main Authors: Diez-Tejedor, Alberto, Flores, Francisco, Niz, Gustavo
Format: Article
Language:English
Subjects:
Clustering
Cold dark matter
Couplings
Dark energy
Dark matter
Gravitation theory
Gravitational waves
Standard model (particle physics)
Universe
Wave propagation
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Starting from the Gleyzes-Langlois-Piazza-Vernizzi action, we derive the most general effective theory that is invariant under internal shifts and a Z2 mirror symmetry in the scalar sector. Contrary to what one may think, this model presents a dark matter tracker previous to the dark energy domination. We show that, in an empty universe and to linear order in perturbations, the scalar mode clusters in exactly the same way as standard nonrelativistic cold dark matter. This also holds for the subsector of the theory where the speed of propagation of gravitational waves equals that of light, in agreement with the recent multimessenger observation. However, the inclusion of standard model particles introduces nontrivial couplings of the gravitational scalar mode to baryons, modifying their clustering properties. We argue that no arrangement of the parameters of the model can reduce the extra scalar to precisely behave as cold dark matter.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.97.123524