Unified Analysis of Cosmological Perturbations in Generalized Gravity

Details Unified Analysis of Cosmological Perturbations in Generalized Gravity Unified Analysis of Cosmological Perturbations in Generalized Gravity

1995-09-25

arxiv.org/abs/gr-qc/9509044v1

Phys.Rev. D53 (1996) 762-765

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

4 pages, revtex, no figures

Scientific paper

10.1103/PhysRevD.53.762

In a class of generalized Einstein's gravity theories we derive the equations and general asymptotic solutions describing the evolution of the perturbed universe in unified forms. Our gravity theory considers general couplings between the scalar field and the scalar curvature in the Lagrangian, thus includes broad classes of generalized gravity theories resulting from recent attempts for the unification. We analyze both the scalar-type mode and the gravitational wave in analogous ways. For both modes the large scale evolutions are characterized by the same conserved quantities which are valid in the Einstein's gravity. This unified and simple treatment is possible due to our proper choice of the gauges, or equivalently gauge invariant combinations.

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