Cosmological Perturbation Analysis in a Scale Invariant Model of Gravity

Details Cosmological Perturbation Analysis in a Scale Invariant Model of Gravity Cosmological Perturbation Analysis in a Scale Invariant Model of Gravity

2011-05-25

arxiv.org/abs/1105.4929v2

Class.Quant.Grav.28:215010,2011

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

9 pages, 1 figure

Scientific paper

10.1088/0264-9381/28/21/215010

We consider a model for gravity that is invariant under global scale transformations. It includes one extra real scalar field coupled non-minimally to the gravity fields. In this model all the dimensionful parameters like the gravitational constant and the cosmological constant etc. are generated by a solution of the classical equations of motion which breaks scale invariance. In this paper we demonstrate the stability of such a solution against small perturbations in a flat FRW background by making a perturbative expansion around this solution and solving the resulting equations linear in the perturbations.

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