Imperfect Dark Energy from Kinetic Gravity Braiding

Abstract

We introduce a large class of scalar-tensor models with interactions containing the second derivatives of the scalar field but not leading to additional degrees of freedom. These models exhibit peculiar features, such as an essential mixing of scalar and tensor kinetic terms, which we have named kinetic braiding. This braiding causes the scalar stress tensor to deviate from the perfect-fluid form. Cosmology in these models possesses a rich phenomenology, even in the limit where the scalar is an exact Goldstone boson. Generically, there are attractor solutions where the scalar monitors the behaviour of external matter. Because of the kinetic braiding, the position of the attractor depends both on the form of the Lagrangian and on the external energy density. The late-time asymptotic of these cosmologies is a de Sitter state. The scalar can exhibit phantom behaviour and is able to cross the phantom divide with neither ghosts nor gradient instabilities. These features provide a new class of models for Dark Energy. As an example, we study in detail a simple one-parameter model. The possible observational signatures of this model include a sizeable Early Dark Energy and a specific equation of state evolving into the final de-Sitter state from a healthy phantom regime.

41 pages, 7 figures. References and some clarifying language added. This version was accepted for publication in JCAP

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• Quintom fields from chiral K-essence cosmology
• Perturbative stability of SFT-based cosmological models
• Perturbations in generalized Galileon theories
• Galileon intermediate inflation
• Cosmological Tests of Coupled Galileons
• Noether symmetry in Horndeski Lagrangian
• Structure formation in an anisotropic universe: Eulerian perturbation theory
• Testing gravity with halo density profiles observed through gravitational lensing
• Singularity resolution and inflation from an infinite tower of regularized curvature corrections
• Thermal power spectrum in the CFT driven cosmology
• Classical Duals, Legendre Transforms and the Vainshtein Mechanism
• Probing signatures of bounce inflation with current observations
• Stable phantom-divide crossing in two scalar models with matter
• Cosmographic analysis of sign-switching dark energy
• Complete Hamiltonian analysis of cosmological perturbations at all orders II: Non-canonical scalar field
• Galilean Islands in Eternally Inflating Background
• The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: constraints on the time variation of fundamental constants from the large-scale two-point correlation function
• Non-minimally coupled quintessence DE model with a cubic galileon term --A Dynamical System Analysis
• No Run Gravity
• Large tensor mode, field range bound and consistency in generalized G-inflation
• Observational consequences of the Standard Model Higgs inflation variants
• A study on Cubic Galileon Gravity Using N-body Simulations
• Tailoring cosmologies in cubic shift-symmetric Horndeski gravity
• Chaotic Inflation and Reheating in Generalized Scalar-Tensor Gravity
• Primordial Black Holes Dark Matter and Secondary Gravitational Waves from Warm Higgs-G Inflation
• The Well-Tempered Cosmological Constant: Fugue in B${}^{♭}$
• The Effective Fluid approach for Modified Gravity and its applications
• Solitons in generalized galileon theories
• Relativistic Corrections to the Growth of Structure in Modified Gravity
• Exploring cosmological imprints of phantom crossing with dynamical dark energy in Horndeski gravity
• B-Mode auto-bispectrum due to matter bounce
• Hair-dressing Horndeski: an approach to hairy solutions in cubic Horndeski gravity
• General background conditions for K-bounce and adiabaticity
• Simple numerical implementation of general dark energy models
• Shift-symmetric Horndeski gravity in the asymptotic-safety paradigm
• Eternal Universes
• Are redshift-space distortions actually a probe of growth of structure?
• Double screening
• Fully relativistic predictions in Horndeski gravity from standard Newtonian N-body simulations
• Viable dark energy models using pseudo-Nambu-Goldstone bosons
• Vector Galileon and inflationary magnetogenesis
• First and second order cosmological perturbations in light mass Galileon models
• Reconstruction method in the kinetic gravity braiding theory with shift-symmetric
• 21 cm power spectrum in interacting cubic Galileon model
• Self-tuning kinetic gravity braiding: Cosmological dynamics, shift symmetry, and the tadpole
• Emergence of ghosts in Horndeski theory
• Black holes in self-tuning cubic Horndeski cosmology
• Consistency of Cubic Galileon Cosmology: Model-Independent Bounds from Background Expansion and Perturbative Analyses
• A general proof of the equivalence between the δN and covariant formalisms
• Phantom attractors in Kinetic Gravity Braiding theories: a dynamical system approach
• Alternative formulations of the thermodynamics of scalar-tensor theories
• Dark energy with a shift-symmetric scalar field: obstacles, loophole hunting and dead ends
• Spherically symmetric solutions of light Galileon
• Constraining cosmological scaling solutions of a Galileon field
• Backreaction mechanism in multifluid and extended cosmologies
• Causality and Stability from Acoustic Geometry
• On tachyonic stability priors for dark energy
• Revisiting Cardassian Model and Cosmic Constraint
• Stealth black hole perturbations in kinetic gravity braiding
• The cosmic trimmer: Black-hole hair in scalar-Gauss-Bonnet gravity is altered by cosmology
• On Dark Energy Isocurvature Perturbation
• Gradient expansion of superhorizon perturbations in G-inflation
• Superluminality in dilatationally invariant generalized Galileon theories
• Metric-Affine Formalism of Higher Derivative Scalar Fields in Cosmology
• Evidence for evolving dark energy from DESI DR2 BAO and Pantheon${}^{+}$, DES-Dovekie, and Union3
• Modified natural inflation: A small single field model with a large tensor to scalar ratio
• Phantom Divide Crossing with General Non-minimal Kinetic Coupling
• Gravitational wave signatures from dark sector interactions
• General analysis of Noether symmetries in Horndeski gravity
• Stable static structures in models with higher-order derivatives
• Reconstruction in the Horndeski theory within the scope of the Bianchi I cosmology
• Global asymptotic dynamics of the cubic galileon interacting with dark matter
• Regular black holes from pure gravity in four dimensions
• Disformally self-tuning gravity
• Instability of Static Semi-Closed Worlds in Generalized Galileon Theories
• Vainshtein in the UV and a Wilsonian analysis of derivatively coupled scalars
• Kinetic gravity braiding wormhole geometries
• Can Horndeski Genesis be Nonpathological?
• Generalized Horndeski-Like Einstein Gauss-Bonnet Inflation with Massless Primordial Gravitons
• Gödel-type Solutions in Cubic Galileon Gravity
• Deconstructing higher order clockwork gravity
• The Stringy Origins of Galileons and their Novel Limit
• Quartic Horndeski-Cartan theories in a FLRW universe
• Transient dark energy, cosmological constant boundary crossing and dark energy $w(z)$ data fits
• All $2D$ generalised dilaton theories from $d\ge 4$ gravities
• Structure Formation in the Effective Field Theory of Holographic Dark Energy
• Neutrino mass and kinetic gravity braiding degeneracies
• Oscillating solutions of the matter density contrast in Horndeski's theory
• Lanczos equation on light-like hypersurfaces in a cosmologically viable class of kinetic gravity braiding theories
• Modified propagation of gravitational waves from the early radiation era
• Studying G-axion Inflation model in light of PLANCK
• Large black-hole scalar charges induced by cosmology in Horndeski theories
• Properties of perturbations in beyond Horndeski theories
• Diagnostic Approaches for Interacting generalized holographic Ricci Dark Energy Models
• Generalized dilaton gravity in 2d
• Preheating in an inflationary model with disformal coupling
• A general method for the construction of stable Galileon models consistent with the Planck data results
• Cosmological Dynamics and Double Screening of DBI Galileon Gravity
• Shock waves as branes with throats
• Confronting Inflation Models with the Coming Observations on Primordial Gravitational Waves
• Neutrino Lorentz invariance violation from the CPT-even SME coefficients through a tensor interaction with cosmological scalar fields
• Classical Solutions of Higher-Derivative Theories
• Generalized Galileon Scenario Inspires Chaotic Inflation
• Theoretical priors in scalar-tensor cosmologies: Shift-symmetric Horndeski models
• The Direction of Gravity
• Consistency Relation and Non-Gaussianity in a Galileon Inflation
• Gravitational wave interactions in ${\Lambda }_3$ models of dark energy
• Exact Kerr--Schild spacetimes from linearized kinetic gravity braiding
• Horndeski in motion
• Spherically symmetric, static black holes with scalar hair, and naked singularities in nonminimally coupled k-essence
• On the Stability of Cubic Galileon Accretion
• Extremal cosmological black holes in Horndeski gravity and the anti-evaporation regime
• K-essence sources of Kerr-Schild spacetimes
• Perturbations and stability conditions of k-essence and kinetic gravity braiding models in two-field measure theory
• Cosmic acceleration from string induced Galileons
• Future Dark Energy Constraints from Atomic Clocks
• Covariant single-field formulation of effective cosmological bounces
• Non-parametric exploration of minimally coupled gravity with phantom crossing
• Scalar-scalar-tensor interaction in DHOST theories
• No-Go theorem in the cubic subclass of Horndeski theory for spherically symmetric dynamical background
• Solar System and Atomic Clock Bounds on Locally Coupled Swampland Scalars
• Cosmological Model of Interacting Phantom and Yang-Mills Fields
• Multisymplectic Formalism for Cubic Horndeski Theories
• Non-singular Bouncing Cosmology in $f(R,G,T)$--Quintom model