Averaging inhomogeneities in scalar-tensor cosmology
Vincenzo Vitagliano (SISSA, INFN, Trieste), Stefano Liberati (SISSA, and INFN, Trieste), Valerio Faraoni (Bishop's University, Sherbrooke)
TL;DR
This paper investigates how inhomogeneities influence cosmic evolution in scalar-tensor gravity, revealing that scalar field contributions can lead to acceleration effects, with specific focus on Brans-Dicke and f(R) models.
Contribution
It introduces a formalism for analyzing inhomogeneities in scalar-tensor theories and highlights the potential for these inhomogeneities to cause cosmic acceleration.
Findings
Inhomogeneities can contribute to cosmic acceleration in scalar-tensor gravity.
Brans-Dicke and f(R) models exemplify the formalism's application.
Representation issues in the formalism are identified.
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.
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