Equivalence principle violation in weakly Vainshtein-screened systems

Equivalence Principle Violation in Weakly Vainshtein-Screened Systems

Massive gravity, galileon and braneworld models that modify gravity to explain cosmic acceleration utilize the nonlinear field interactions of the Vainshtein mechanism to screen fifth forces in high density regimes. These source-dependent interactions cause apparent equivalence principle violations. In the weakly-screened regime violations can be especially prominent since the fifth forces are ...

Equivalence principle violation in Vainshtein screened two-body systems

Takashi Hiramatsu, Wayne Hu, Kazuya Koyama, and Fabian Schmidt Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan Department of Astronomy and Astrophysics, Kavli Institute for Cosmological Physics, University of Chicago, Chicago, Illinois 60637, USA Institute of Cosmology and Gravitation, University of Portsmouth, Dennis Sciama Building, Portsmouth PO1 3FX, United...

Equivalence Principle parity violation tests

Gravitation is parity symmetric or antisymmetric. Mass distribution parity divergence varies from χ = 0 (achiral) to χ = 1 (perfect). A parity Eötvös experiment contrasts chemically and macroscopically identical enantiomorphic space groups P3121 and P3221 α-quartz single crystal test masses. A parity calorimetry experiment contrasts P3121 and P3221 benzil single crystals’ enthalpies of fusion. ...

Dark-Matter-Induced Weak Equivalence Principle Violation

Violation of the Equivalence Principle in String Dilaton Theories

We study violations of the weak equivalence principle in the context of string dilaton theories. In these models some fundamental constants become spaceas well as time-dependent. We show that although universality of free fall (UFF) experiments set bounds on parameters that govern the cosmological evolution of the scalar fields, these are strongly relaxed when considering the space dependent be...