A Review on the Cosmology of the de Sitter Horndeski Models

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Nunes, Nelson and Martín Moruno, Prado and Lobo, Francisco (2017) A Review on the Cosmology of the de Sitter Horndeski Models. Universe, 3 (2). p. 33. ISSN 2218-1997

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Official URL: https://doi.org/10.3390/universe3020033




Abstract

We review the most general scalar-tensor cosmological models with up to second-order derivatives in the field equations that have a fixed spatially flat de Sitter critical point independent of the material content or vacuum energy. This subclass of the Horndeski Lagrangian is capable of dynamically adjusting any value of the vacuum energy of the matter fields at the critical point. We present the cosmological evolution of the linear models and the non-linear models with shift symmetry. We come to the conclusion that the shift symmetric non-linear models can deliver a viable background compatible with current observations.


Item Type:Article
Uncontrolled Keywords:cosmology; dark energy; extensions of general relativity
Subjects:Sciences > Physics > Astrophysics
ID Code:65338
Deposited On:24 May 2021 14:30
Last Modified:24 May 2021 15:28

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