Inflationary attractors and perturbation spectra in generally coupled gravity.

  title={Inflationary attractors and perturbation spectra in generally coupled gravity.},
  author={Amendola and Bellisai and Occhionero},
  journal={Physical review. D, Particles and fields},
  volume={47 10},
A generic outcome of theories with scalar-tensor coupling is the existence of inflationary attractors, either power law or de Sitter type. The fluctuations arising during this phase are Gaussian and their spectrum depends on the wave number k according to the power law k 1/(1−p) , where p is the inflationary power-law exponent. We investigate to what extent these properties depend on the coupling function and potential. We find the class of models in which variable attractors exist. Within this… 

Tachyon cosmology with nonminimal derivative coupling

In this paper we study a gravitational theory in which tachyons play the role of a scalar field. Also, nonminimal derivative coupling between tachyons and the Einstein tensor is considered in the

General non-minimal kinetic coupling to gravity

We study a model of scalar field with a general non-minimal kinetic coupling to itself and to the curvature, as a source of dark energy, and analyze the cosmological dynamics of this model and the

Perturbations in a coupled scalar field cosmology

I analyse the density perturbations in a cosmological model with a scalar field coupled to ordinary matter, such as one obtains in string theory and in conformally transformed scalar–tensor theories.

Are there really conformal frames? Uniqueness of affine inflation

  • H. Azri
  • Physics
    International Journal of Modern Physics D
  • 2018
Here, we concisely review the nonminimal coupling dynamics of a single scalar field in the context of purely affine gravity and extend the study to multifield dynamics. The coupling is performed via

Non-minimal Kinetic coupling to gravity and accelerated expansion

We study a scalar field with kinetic term coupled to itself and to the curvature, as a source of dark energy, and analyze the role of this new coupling in the accelerated expansion at large times. In

Oscillatory behavior in cosmological models

Oscillatory behavior in cosmological models is investigated, motivated, in part, by the apparent periodic distribution of galaxies in deep narrow-cone red-shift surveys. In particular, oscillatory

Models of disformally coupled dark energy

Cosmology is the study of the universe, or cosmos, regarded as a whole. Standard cosmology began with the formulation of the theory of General Relativity (GR) in 1915, by Albert Einstein. GR has

Late-time acceleration : interacting dark energy and modified gravity

In 1998 astronomical observations of distant stars exploding at the ends of their lives led to the discovery that the expansion of the Universe is accelerating. This is likely to be caused by an



10th Italian Conference on General Relativity and Gravitational Physics, Bardonecchia(Torino), September 1-5, 1992

WS Representation and Functional Integrals on Connections (L Accardi) Gravitational Topological Charge and Gravibreather (V Belinsky) Doppler Tracking Experiments (B Bertotti), Towards an

Quantum Fields in Curved Space

This book presents a comprehensive review of the subject of gravitational effects in quantum field theory. Although the treatment is general, special emphasis is given to the Hawking black hole

Fokker-Planck Equation

As shown in Sects. 3.1, 2 we can immediately obtain expectation values for processes described by the linear Langevin equations (3.1, 31). For nonlinear Langevin equations (3.67, 110) expectation

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