Averaging inhomogeneities in scalar-tensor cosmology

Details Averaging inhomogeneities in scalar-tensor cosmology Averaging inhomogeneities in scalar-tensor cosmology

2009-06-30

arxiv.org/abs/0906.5429v2

Class.Quant.Grav.26:215005,2009

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Comments and references added. 14 pages

Scientific paper

10.1088/0264-9381/26/21/215005

The backreaction of inhomogeneities on the cosmic dynamics is studied in the context of scalar-tensor gravity. Due to terms of indefinite sign in the non-canonical effective energy tensor of the Brans-Dicke-like scalar field, extra contributions to the cosmic acceleration can arise. Brans-Dicke and metric f(R) gravity are presented as specific examples. Certain representation problems of the formalism peculiar to these theories are pointed out.

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