Critical solutions of nonminimally coupled scalar field theory and first-order thermodynamics of gravity

@article{Faraoni2022CriticalSO,
  title={Critical solutions of nonminimally coupled scalar field theory and first-order thermodynamics of gravity},
  author={Valerio Faraoni and Pierre-Antoine Graham and Alexandre Leblanc},
  journal={Physical Review D},
  year={2022}
}
Analytical solutions of nonminimally coupled scalar field cosmology corresponding to critical scalar field values constitute a potential challenge to the recent first-order thermodynamics of scalar-tensor gravity (a formalism picturing general relativity as the zero-temperature equilibrium state for modified gravity). The critical solutions are unstable with respect to homogeneous perturbations, hence unphysical. 
1 Citations

Figures from this paper

Effective fluid mixture of tensor-multi-scalar gravity

We apply to tensor-multi-scalar gravity the effective fluid analysis based on the representation of the gravitational scalar field as a dissipative effective fluid. This generalization poses new

References

SHOWING 1-10 OF 78 REFERENCES

First-order thermodynamics of scalar-tensor cosmology

A new thermodynamics of scalar-tensor gravity is applied to spatially homogeneous and isotropic cosmologies in this class of theories and tested on analytical solutions. A forever-expanding universe

Peculiar thermal states in the first-order thermodynamics of gravity

In the context of the recently proposed first-order thermodynamics of scalar-tensor gravity, we discuss the possibility of zero-temperature states of equilibrium other than Einstein gravity, including

Model dependence of the nonminimal scalar graviton effective coupling constant in curved space-time

We investigate the renormalization group behavior of the non-minimal scalar-graviton effective coupling constant in asymptotically free theories (where scalars are elementary) and in a simple

Nonminimal coupling of the scalar field and inflation.

  • Faraoni
  • Mathematics
    Physical review. D, Particles and fields
  • 1996
The results are applied to the most popular inflationary scenarios of the universe; their theoretical consistency and certain observational constraints are discussed.

New approach to the thermodynamics of scalar-tensor gravity

We further develop the recently proposed thermodynamics of scalar-tensor gravity and investigate its diffusion toward general relativity, seen as a thermal equilibrium state. Describing scalar-tensor

First-order thermodynamics of Horndeski gravity

We extend to the Horndeski realm the irreversible thermodynamics description of gravity previously studied in “first generation” scalar-tensor theories. We identify a subclass of Horndeski theories

Imperfect fluid description of modified gravities

The Brans-Dicke-like field of scalar-tensor gravity can be described as an imperfect fluid in an approach in which the field equations are regarded as effective Einstein equations. After completing

Cosmological perturbations in generalized gravity theories: Solutions.

  • Hwang
  • Physics
    Physical review. D, Particles and fields
  • 1990
We have derived second-order differential equations for cosmological perturbations, using gauge-invariant variables in a Friedmann-Lema\^{\i}tre-Robertson-Walker background, for each of the following

Cosmological perturbations in generalized gravity theories: conformal transformation

A broad class of generalized gravity theories can be cast into Einstein gravity with a minimally coupled scalar field using a suitable conformal rescaling of the metric. Using this conformal

Cosmological perturbations in generalized gravity theories.

  • HwangNoh
  • Physics
    Physical review. D, Particles and fields
  • 1996
The classical evolution as well as the quantum generation processes in these variety of gravity theories are presented in unified forms both to the scalar- and tensor-type perturbations.
...