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Equivalence principle violation in nonminimally coupled gravity and constraints from Lunar Laser Ranging

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arxiv 2312.14618 v2 pith:PCXXBOIB submitted 2023-12-22 gr-qc astro-ph.CO

Equivalence principle violation in nonminimally coupled gravity and constraints from Lunar Laser Ranging

Riccardo March , Orfeu Bertolami , Marco Muccino , Simone Dell'Agnello This is my paper
classification gr-qc astro-ph.CO
keywords equivalencegravityprinciplecoupledforcelaserlunarnonminimally
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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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  1. Equivalence Principle violation in metric-affine gravity and finite-temperature effects

    gr-qc 2026-06 unverdicted novelty 4.0

    Metric-affine gravity formulates equivalence principle violations via non-metricity that parallel finite-temperature mass-ratio shifts, and a generalized Fermi-Walker derivative shows no orthonormal tetrad propagates ...