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