Evidence for Galaxy Dynamics Tracing Background Cosmology Below the de Sitter Scale of Acceleration

Abstract

Galaxy dynamics probe weak gravity at accelerations below the de Sitter scale of acceleration , where c is the velocity of light and H is the Hubble parameter. Low- and high-redshift galaxies hereby offer a novel probe of weak gravity in an evolving cosmology, satisfying / with matter content sans tension to H ₀ in surveys of the local universe. Galaxy rotation curves show anomalous galaxy dynamics in weak gravity across a transition radius in galaxies of mass , where a _N is the Newtonian acceleration based on baryonic matter content. We identify this behavior with a holographic origin of inertia from entanglement entropy, which introduces a C ⁰ onset across with asymptotic behavior described by a Milgrom parameter satisfying , where is a fundamental eigenfrequency of the cosmological horizon. Extending an earlier confrontation with data covering at redshift in Lellie et al., the modest anomalous behavior in the Genzel et al. sample at redshifts is found to be mostly due to clustering close to the C ⁰ onset to weak gravity and an increase of up to 65% in a ₀.