Equivalence principle violation in nonminimally coupled gravity and constraints from Lunar Laser Ranging
arxiv(2023)
摘要
We analyze the dynamics of the Sun-Earth-Moon system in the context of a
particular class of theories of gravity where curvature and matter are
nonminimally coupled (NMC). These theories can potentially violate the
Equivalence Principle as they give origin to a fifth force and a extra
non-Newtonian force that may imply that Earth and Moon fall differently towards
the Sun. We show, through a detailed analysis, that consistency with the bound
on Weak Equivalence Principle arising from 48 years of Lunar Laser Ranging
data, for a range of parameters of the NMC gravity theory, can be achieved via
the implementation of a suitable screening mechanism.
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