2017/02/14 by Federico Lelli, Stacy S. McGaugh, Stacy McGaugh +1 · 2 citations
Physics and Astronomy · #Acceleration #Black Holes and Theoretical Physics #Classical mechanics #Computer science #Cosmology and Gravitation Theories #Experimental and Theoretical Physics Studies #Physics #Relation (database) #Theoretical physics #astro-ph.CO #astro-ph.GA #gr-qc #hep-th
paper · pdf · doi:10.1093/mnrasl/slx031
5 pages, 2 figures, accepted for publication in MNRAS Letters
arxiv created 2017/02/14 · openalex publication_date 2017/02/15 · arxiv updated 2017/03/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Abstract It has recently been proposed that space–time and gravity may emerge from an underlying microscopic theory. In a de Sitter space–time, such emergent gravity (EG) contains an additional gravitational force due to dark energy, which may explain the mass discrepancies observed in galactic systems without the need of dark matter. For a point mass, EG is equivalent to Modified Newtonian Dynamics (MOND). We show that this equivalence does not hold for finite-size galaxies: There are significant differences between EG and MOND in the inner regions of galaxies. We confront theoretical predictions with the empirical radial acceleration relation (RAR). We find that (i) EG is consistent with the observed RAR only if we substantially decrease the fiducial stellar mass-to-light ratios; the resulting values are in tension with other astronomical estimates; (ii) EG predicts that the residuals around the RAR should correlate with radius; such residual correlation is not observed.