Perturbative analysis of generalized Einstein's theories

Details Perturbative analysis of generalized Einstein's theories Perturbative analysis of generalized Einstein's theories

1998-06-12

arxiv.org/abs/gr-qc/9806059v1

Int.J.Mod.Phys. D9 (2000) 111-125

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

14 pages, Latex file

Scientific paper

10.1142/S0218271800000116

The hypothesis that the energy-momentum tensor of ordinary matter is not conserved separately, leads to a non-adiabatic expansion and, in many cases, to an Universe older than usual. This may provide a solution for the entropy and age problems of the Standard Cosmological Model. We consider two different theories of this type, and we perform a perturbative analysis, leading to analytical expressions for the evolution of gravitational waves, rotational modes and density perturbations. One of these theories exhibits satisfactory properties at this level, while the other one should be discarded.

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