Perturbative analysis of generalized Einstein's theories

Abstract

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.

14 pages, Latex file

References in corpus (2)

• Evidence for Scale-Scale Correlations in the Cosmic Microwave Background Radiation
• Minkowski Functionals and Cluster Analysis for CMB Maps

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