Perturbative analysis of generalized Einstein theories
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Publication:2711009
DOI10.1142/S0218271800000116zbMATH Open0974.83013arXivgr-qc/9806059OpenAlexW2119370064MaRDI QIDQ2711009
Author name not available (Why is that?)
Publication date: 2 May 2001
Published in: (Search for Journal in Brave)
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.
Full work available at URL: https://arxiv.org/abs/gr-qc/9806059
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