# Scale-invariant alternatives to general relativity. III. The inflation-dark energy connection

@article{Casas2019ScaleinvariantAT,
title={Scale-invariant alternatives to general relativity. III. The inflation-dark energy connection},
author={Santiago Casas and Georgios K Karananas and Martin Pauly and Javier Rubio},
journal={Physical Review D},
year={2019}
}
We discuss the cosmological phenomenology of biscalar-tensor models displaying a maximally symmetric Einstein-frame kinetic sector and constructed on the basis of scale symmetry and volume-preserving diffeomorphisms. These theories contain a single dimensionful parameter Λ0—associated with the invariance under the aforementioned restricted coordinate transformations—and a massless dilaton field. At large field values these scenarios lead to inflation with no generation of isocurvature… Expand
17 Citations

#### Figures and Tables from this paper

Quintessential α-attractor inflation: forecasts for Stage IV galaxy surveys
• Physics
• 2021
Single-field models of α-attractor quintessential inflation provide a unified picture of the two periods of early- and late-time cosmic acceleration, where both inflation and dark energy areExpand
Warm Little Inflaton becomes dark energy
• Physics
• Physics Letters B
• 2019
Abstract We present a model where the inflaton field behaves like quintessence at late times, generating the present phase of accelerated expansion. This is achieved within the framework of warmExpand
Weyl R2 inflation with an emergent Planck scale
Abstract We study inflation in Weyl gravity. The original Weyl quadratic gravity, based on Weyl conformal geometry, is a theory invariant under the Weyl symmetry of gauged scale transformations.Expand
Weyl inflation and an emergent Planck scale
We study inflation in Weyl gravity. The original Weyl quadratic gravity, based on Weyl conformal geometry, is a theory invariant under Weyl symmetry of (gauged) local scale transformations. In thisExpand
α-attractor dark energy in view of next-generation cosmological surveys
• Physics
• Journal of Cosmology and Astroparticle Physics
• 2019
The $\alpha$-attractor inflationary models are nowadays favored by CMB Planck observations. Their similarity with canonical quintessence models motivates the exploration of a common framework thatExpand
Aspects of Higgs Inflation
The earliest stage in the history of the universe is successfully modelled by cosmic inflation, a period of nearly exponential expansion. Due to inflation, the universe became spatially flat, old,Expand
Scale-independent R2 inflation
• Physics
• 2019
Weyl (scale) invariant theories of scalars and gravity can generate all mass scales spontaneously. In this paper we study a particularly simple version -- scale invariant $R^2$ gravity -- and showExpand
Scale and Weyl Invariance in Einstein-Cartan Gravity
• Physics
• 2021
We show how Einstein-Cartan gravity can accommodate both global scale and local scale (Weyl) invariance. To this end, we construct a wide class of models with nonpropagaing torsion and a nonminimallyExpand
Scale symmetry, the Higgs and the Cosmos
I review the Higgs-Dilaton model: a scale-invariant extension of the Standard Model and gravity able to support inflation and dark energy with just an additional degree of freedom on top of theExpand
Higgs Inflation
• J. Rubio
• Physics
• Front. Astron. Space Sci.
• 2019
The properties of the recently discovered Higgs boson together with the absence of new physics at collider experiments allows us to speculate about consistently extending the Standard Model ofExpand

#### References

SHOWING 1-10 OF 136 REFERENCES
Emergent scale symmetry: Connecting inflation and dark energy
• Physics
• 2017
Quantum gravity computations suggest the existence of an ultraviolet and an infrared fixed point where quantum scale invariance emerges as an exact symmetry. We discuss a particular variable gravityExpand
Scale-invariant alternatives to general relativity
• Physics
• 2011
We study the general class of gravitational field theories constructed on the basis of scale invariance (and therefore absence of any mass parameters) and invariance under transverse diffeomorphisms,Expand
A minimal scale invariant axion solution to the strong CP-problem
We present a scale-invariant extension of the Standard model allowing for the Kim-Shifman-Vainstein-Zakharov (KSVZ) axion solution of the strong CP problem in QCD. We add the minimal number of newExpand
Scale-invariant alternatives to general relativity. II. Dilaton properties
• Physics
• 2016
In the present paper, we revisit gravitational theories which are invariant under TDiffs-transverse (volume-preserving) diffeomorphisms and global scale transformations. It is known that theseExpand
Higgs-Dilaton cosmology: Universality versus criticality
• Physics
• 2014
The Higgs-Dilaton model is able to produce an early inflationary expansion followed by a dark energy dominated era responsible for the late time acceleration of the Universe. At tree level, the modelExpand
Higgs-dilaton cosmology: An inflation-dark-energy connection and forecasts for future galaxy surveys
• Physics
• 2018
The Higgs-Dilaton model is a scale-invariant extension of the Standard Model non-minimally coupled to gravity and containing just one additional degree of freedom on top of the Standard ModelExpand
Higgs-Dilaton Cosmology: an effective field theory approach
• Physics
• 2013
The Higgs-dilaton cosmological model is able to describe simultaneously an inflationary expansion in the early Universe and a dark energy dominated stage responsible for the present day acceleration.Expand
Cosmological dark energy: prospects for a dynamical theory
• Physics
• 2007
We present an approach to the problem of vacuum energy in cosmology, based on dynamical screening of Λ on the horizon scale. We review first the physical basis of vacuum energy as a phenomenonExpand
Scale-independent inflation and hierarchy generation
• Physics
• 2016
Abstract We discuss models involving two scalar fields coupled to classical gravity that satisfy the general criteria: (i) the theory has no mass input parameters, (ii) classical scale symmetry isExpand
Higgs-dilaton cosmology: From the early to the late Universe
• Physics
• 2011
We consider a minimal scale-invariant extension of the standard model of particle physics combined with unimodular gravity formulated in [M. Shaposhnikov and D. Zenhausern, Phys. Lett. B 671, 187Expand