Averaging inhomogeneities in scalar-tensor cosmology
classification
🌀 gr-qc
astro-ph.CO
keywords
cosmicgravityinhomogeneitiesscalar-tensoraccelerationariseaveragingbackreaction
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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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