Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2016/01/010
Keywords
modified gravity; dark energy theory
Funding
- Fundacao para a Ciencia e a Tecnologia (FCT) [SFRH/BD/85164/2012]
- STFC, BIPAC, a Higgs visiting fellowship
- Oxford Martin School
- STFC [ST/N000919/1, ST/M00418X/1, ST/K00106X/1, ST/K00333X/1, ST/M007065/1, ST/L000636/1, ST/J005673/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/M007065/1, ST/L000636/1, ST/J005673/1, ST/K00106X/1, ST/K00333X/1, ST/M00418X/1] Funding Source: researchfish
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We introduce a designer approach for extended Brans-Dicke gravity that allows us to obtain the evolution of the scalar field by fixing the Hubble parameter to that of a wCDM model. We obtain analytical approximations for phi as a function of the scale factor and use these to build expressions for the effective Newton's constant at the background and at the linear level and the slip between the perturbed Newtonian potentials. By doing so, we are able to explore their dependence on the fundamental parameters of the theory.
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