# Observational consequences of evolution of primordial fluctuations in scalar - tensor cosmology

@article{Nagata2002ObservationalCO, title={Observational consequences of evolution of primordial fluctuations in scalar - tensor cosmology}, author={Ryo Nagata and Takeshi Chiba and Naoshi Sugiyama}, journal={Physical Review D}, year={2002}, volume={66}, pages={103510} }

The evolution of primordial fluctuations in a Brans-Dicke type scalar-tensor gravity theory is comprehensively investigated. The harmonic attractor model, in which the scalar field has its harmonic effective potential in the Einstein conformal frame and the theory relaxes toward Einstein gravity with time, is considered. The evolution of adiabatic initial perturbations in flat SCDM models is examined from the radiation-dominated epoch up to the present. We discuss how the scalar-tensor gravity…

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## References

SHOWING 1-10 OF 46 REFERENCES

### Big bang nucleosynthesis and tensor-scalar gravity

- Physics
- 1999

Big Bang Nucleosynthesis (BBN) is studied within the framework of a two-parameter family of tensor-scalar theories of gravitation, with nonlinear scalar-matter coupling function a(phi).
We run a BBN…

### Scalar-Tensor Theory and Gravitational Waves

- Physics, Geology
- 1970

An analysis of general scalar-tensor gravitation theory, containing two arbitrary functions of the scalar field, is presented. The weak-field limit is considered in detail, and predictions for the…

### Behavior of cosmological models with varying G

- Physics
- 1997

We provide a detailed analysis of Friedmann-Robertson-Walker universes in a wide range of scalar-tensor theories of gravity. We apply solution-generating methods to three parametrized classes of…

### Tensor-scalar cosmological models and their relaxation toward general relativity.

- PhysicsPhysical review. D, Particles and fields
- 1993

Quantitative estimates for the present level of deviation from general relativity, as measured by the post-Newtonian parameters, are derived, which give greater significance to future improvements of solar-system gravitational tests.

### Gauge Invariant Cosmological Perturbations

- Physics
- 1980

The physical interpretation of perturbations of homogeneous, isotropic cosmological models in the early Universe, when the perturbation is larger than the particle horizon, is clarified by defining a…

### Comments on the scalar-tensor theory

- Physics
- 1968

Scalar-tensor theories are discussed as encompassing three classical long-range fields, including the electromagnetic field. In order to shed additional light on the restrictive assumptions made by…

### General relativity as a cosmological attractor of tensor-scalar theories.

- PhysicsPhysical review letters
- 1993

Tensor-scalar theories of gravity are shown to generically contain an attractor mechanism toward general relativity, with the redshift at the beginning of the matter-dominated era providing the…

### On the problem of the initial state in the isotropic scalar-tensor cosmology of Brans-Dicke

- Physics
- 1973

AbstractIn connection with the problem of the initial singularity in the framework of the Brans-Dicke scalar-tensor isotropic cosmology, the dynamics of the early stages of the expansion is studied…

### Phase-plane analysis of Friedmann-Robertson-Walker cosmologies in Brans-Dicke gravity

- Physics
- 1998

We present an autonomous phase plane describing the evolution of Friedmann-Robertson-Walker models containing a perfect fluid (with barotropic index ) in Brans-Dicke gravity (with Brans-Dicke…