HAL will be down for maintenance from Friday, June 10 at 4pm through Monday, June 13 at 9am. More information
Skip to Main content Skip to Navigation
Journal articles

Mimetic gravity as DHOST theories

Abstract : 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.
Complete list of metadata

Contributor : Inspire Hep Connect in order to contact the contributor
Submitted on : Wednesday, February 28, 2018 - 12:11:50 PM
Last modification on : Wednesday, January 26, 2022 - 3:35:52 AM

Links full text



David Langlois, Michele Mancarella, Karim Noui, Filippo Vernizzi. Mimetic gravity as DHOST theories. JCAP, 2019, 02, pp.036. ⟨10.1088/1475-7516/2019/02/036⟩. ⟨hal-01719629⟩



Record views