Attracted to de Sitter II: cosmology of the shift-symmetric Horndeski models

Abstract

Horndeski models with a de Sitter critical point for any kind of material content may provide a mechanism to alleviate the cosmological constant problem. Moreover, they could allow us to understand the current accelerated expansion of the universe as the result of the dynamical approach to the critical point when it is an attractor. We show that this critical point is indeed an attractor for the shift- symmetric subfamily of models with these characteristics. We study the cosmological scenario that results when considering radiation and matter content, and conclude that their background dynamics is compatible with the latest observational data.

V1: 20 pages, 11 figures. V2: 1 reference added. V3: 21 pages. Clarifications in the discussion; no physics changes. This version accepted for publication in JCAP

References in corpus (5)

• Covariant Galileon
• Non-Renormalization and Naturalness in a Class of Scalar-Tensor Theories
• Vacuum Energy Sequestering: The Framework and Its Cosmological Consequences
• Horndeski theories self-tuning to a de Sitter vacuum
• Attracted to de Sitter: cosmology of the linear Horndeski models

Cited by in corpus (13)

• Dynamical systems applied to cosmology: dark energy and modified gravity
• Constraining some Horndeski gravity theories
• Unveiling the Dynamics of the Universe
• Cosmological models in modified gravity theories with extended nonminimal derivative couplings
• Large scale structures and the cubic galileon model
• Cosmic structure sizes in generic dark energy models
• Rotating black hole in $f(R)$ theory
• Rotating Killing horizons in generic $F(R)$ gravity theories
• Dark energy with a shift-symmetric scalar field: obstacles, loophole hunting and dead ends
• Phantom attractors in Kinetic Gravity Braiding theories: a dynamical system approach
• A Review on the Cosmology of the de Sitter Horndeski Models
• Big rip in shift-symmetric Kinetic Gravity Braiding theories
• Horndeski in motion