Solar System Constraints on Disformal Gravity Theories
Abstract
Disformal theories of gravity are scalar-tensor theories where the scalar couples derivatively to matter via the Jordan frame metric. These models have recently attracted interest in the cosmological context since they admit accelerating solutions. We derive the solution for a static isolated mass in generic disformal gravity theories and transform it into the parameterised post-Newtonian form. This allows us to investigate constraints placed on such theories by local tests of gravity. The tightest constraints come from preferred-frame effects due to the motion of the Solar System with respect to the evolving cosmological background field. The constraints we obtain improve upon the previous solar system constraints by two orders of magnitude, and constrain the scale of the disformal coupling for generic models to eV. These constraints render all disformal effects irrelevant for cosmology.
Cite
@article{arxiv.1507.00568,
title = {Solar System Constraints on Disformal Gravity Theories},
author = {Hiu Yan Ip and Jeremy Sakstein and Fabian Schmidt},
journal= {arXiv preprint arXiv:1507.00568},
year = {2015}
}
Comments
17 pages, 2 figures v2: Added discussion of implications for cosmology in Sec. 5.2. Version accepted by JCAP. v3: Corrected minor typos