Averaging inhomogeneities in scalar-tensor cosmology
arXiv:0906.5429 · doi:10.1088/0264-9381/26/21/215005
Abstract
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.
Comments and references added. 14 pages