Mimetic gravity as DHOST theories - Université de Tours Accéder directement au contenu
Article Dans Une Revue Journal of Cosmology and Astroparticle Physics Année : 2019

Mimetic gravity as DHOST theories

Résumé

We show that theories of mimetic gravity can be viewed as degenerate higher-order scalar-tensor (DHOST) theories that admit an extra local (gauge) symmetry in addition to the usual diffeomorphism invariance. We reformulate and classify mimetic theories in this perspective. Using the effective theory of dark energy, recently extended to include DHOST theories, we then investigate the linear perturbations about a homogeneous and isotropic background for all mimetic theories. We also include matter, in the form of a k-essence scalar field, and we derive the quadratic action for linear perturbations in this case.
Fichier principal
Vignette du fichier
1802.03394.pdf (505.51 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-01719629 , version 1 (20-03-2024)

Identifiants

Citer

David Langlois, Michele Mancarella, Karim Noui, Filippo Vernizzi. Mimetic gravity as DHOST theories. Journal of Cosmology and Astroparticle Physics, 2019, 02, pp.036. ⟨10.1088/1475-7516/2019/02/036⟩. ⟨hal-01719629⟩
228 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More