Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2006-12-27
AIP Conf.Proc.910:361-380,2007
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
17 pages; Lecture provided at the XII. Brazilian School of Cosmology and Gravitation, Mangaratiba, Rio de Janeiro, Brazil, Sep
Scientific paper
10.1063/1.2752486
The effective evolution of an inhomogeneous universe model in Einstein's theory of gravitation may be described in terms of spatially averaged scalar variables. This evolution can be modeled by solutions of a set of Friedmann equations for an effective scale factor, with matter and backreaction source terms, where the latter can be represented by a minimally coupled scalar field (`morphon field'). We review the basic steps of a description of backreaction effects in relativistic cosmology that lead to refurnishing the standard cosmological equations, but also lay down a number of unresolved issues in connection with their interpretation within observational cosmology.
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