# A unifying description of dark energy

@article{Gleyzes2014AUD, title={A unifying description of dark energy}, author={J'erome Gleyzes and David Langlois and Filippo Vernizzi}, journal={arXiv: High Energy Physics - Theory}, year={2014} }

We review and extend a novel approach that we introduced recently, to describe general dark energy or scalar-tensor models. Our approach relies on an ADM formulation based on the hypersurfaces where the underlying scalar field is uniform. The advantage of this approach is that it can describe in the same language and in a minimal way a vast number of existing models, such as quintessence models, $F(R)$ theories, scalar tensor theories, their Horndeski extensions and beyond. It also naturally…

## Tables from this paper

## 177 Citations

### Effective description of higher-order scalar-tensor theories

- Physics
- 2017

Most existing theories of dark energy and/or modified gravity, involving a scalar degree of freedom, can be conveniently described within the framework of the Effective Theory of Dark Energy, based…

### An effective description of dark energy: from theory to phenomenology

- Physics
- 2017

In the last decades, a cosmological model that fits observations through a vast range of scales emerged. It goes under the name of ${\Lambda}$CDM. However, there are still challenging questions that…

### An effective description of dark matter and dark energy in the mildly non-linear regime

- Physics
- 2016

In the next few years, we are going to probe the low-redshift universe with unprecedented accuracy. Among the various fruits that this will bear, it will greatly improve our knowledge of the dynamics…

### Dark energy and modified gravity in the Effective Field Theory of Large-Scale Structure

- Physics
- 2017

We develop an approach to compute observables beyond the linear regime of dark matter perturbations for general dark energy and modified gravity models. We do so by combining the Effective Field…

### Dark sector evolution in Horndeski models

- PhysicsJournal of Cosmology and Astroparticle Physics
- 2019

We use the Equation of State (EoS) approach to study the evolution of the dark sector in Horndeski models, the most general scalar-tensor theories with second order equations of motion. By including…

### Semi-dynamical perturbations of unified dark energy

- Physics
- 2015

Linear cosmological perturbations of a large class of modified gravity and dark energy models can be unified in the effective field theory of cosmic acceleration, encompassing Horndeski scalar-tensor…

### A general theory of linear cosmological perturbations: scalar-tensor and vector-tensor theories

- Mathematics
- 2016

We present a method for parametrizing linear cosmological perturbations of theories of gravity, around homogeneous and isotropic backgrounds. The method is sufficiently general and systematic that it…

### Disformal invariance of cosmological perturbations in a generalized class of Horndeski theories

- Mathematics
- 2014

It is known that Horndeski theories can be transformed to a sub-class of Gleyzes-Langlois-Piazza-Vernizzi (GLPV) theories under the disformal transformation of the metric gμ ν → Ω2(ϕ)gμ ν+Γ (ϕ,X) ∇μ…

### Gravity in the infrared and effective nonlocal models

- PhysicsJournal of Cosmology and Astroparticle Physics
- 2020

We provide a systematic and updated discussion of a research line carried out by our group over the last few years, in which gravity is modified at cosmological distances by the introduction of…

### Phenomenology of dark energy: general features of large-scale perturbations

- Physics
- 2015

We present a systematic exploration of dark energy and modified gravity models containing a single scalar field non-minimally coupled to the metric. Even though the parameter space is large, by…

## References

SHOWING 1-10 OF 52 REFERENCES

### Essential Building Blocks of Dark Energy

- Physics
- 2013

We propose a minimal description of single field dark energy/modified gravity within the effective field theory formalism for cosmological perturbations, which encompasses most existing models. We…

### The effective field theory of dark energy

- Physics
- 2013

We propose a universal description of dark energy and modified gravity that includes all single-field models. By extending a formalism previously applied to inflation, we consider the metric…

### A simplified approach to general scalar-tensor theories

- Physics
- 2013

The most general covariant action describing gravity coupled to a scalar field with only second order equations of motion, Horndeski's theory (also known as ``Generalized Galileons''), provides an…

### Imperfect Dark Energy from Kinetic Gravity Braiding

- Physics
- 2010

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…

### Dark energy or modified gravity? An effective field theory approach

- Physics
- 2013

We take an Effective Field Theory (EFT) approach to unifying existing proposals for the origin of cosmic acceleration and its connection to cosmological observations. Building on earlier work where…

### Consistent perturbations in an imperfect fluid

- Physics
- 2013

We present a new prescription for analysing cosmological perturbations in a more-general class of scalar-field dark-energy models where the energy-momentum tensor has an imperfect-fluid form. This…

### Effective field theory of modified gravity with two scalar fields: dark energy and dark matter

- Physics
- 2014

We present a framework for discussing the cosmology of dark energy and dark matter based on two scalar degrees of freedom. An effective field theory of cosmological perturbations is employed. A…

### Effective field theory of cosmological perturbations

- Physics
- 2013

The effective field theory of cosmological perturbations stems from considering a cosmological background solution as a state displaying spontaneous breaking of time translations and (adiabatic)…

### Unifying framework for scalar-tensor theories of gravity

- Mathematics
- 2014

A general framework for effective theories propagating two tensor and one scalar degrees of freedom is investigated. Geometrically, it describes dynamical foliation of spacelike hypersurfaces coupled…

### Phenomenology of dark energy: exploring the space of theories with future redshift surveys

- Physics
- 2014

We use the effective field theory of dark energy to explore the space of modified gravity models which are capable of driving the present cosmic acceleration. We identify five universal functions of…