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.
Averaging inhomogeneities in scalar-tensor cosmology / Vitagliano, V; Liberati, S; Faraoni, V. - In: CLASSICAL AND QUANTUM GRAVITY. - ISSN 0264-9381. - 26:21(2009), pp. 215005.1-215005.12. [10.1088/0264-9381/26/21/215005]
Averaging inhomogeneities in scalar-tensor cosmology
Liberati, S;
2009-01-01
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.| File | Dimensione | Formato | |
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