Unifying all mass discrepancies with one effective gravity law?

HongSheng Zhao, Benoit Famaey

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


A remarkably tight relation is observed between the Newtonian gravity sourced by the baryons and the actual gravity in galaxies of all sizes. This can be interpreted as the effect of a single effective force law depending on acceleration. This is however not the case in larger systems with much deeper potential wells, such as galaxy clusters. Here we explore the possibility of an effective force law reproducing mass discrepancies in all extragalactic systems when depending on both acceleration and the depth of the potential well. We exhibit, at least at a phenomenological level, one such possible construction in the classical gravitational potential theory. Interestingly, the framework, dubbed EMOND, is able to reproduce the observed mass discrepancies in both galaxies and galaxy clusters, and to produce multi-center systems with offsets between the peaks of gravity and the peaks of the baryonic distribution.
Original languageEnglish
Article number067301
JournalPhysical review. D, Particles, fields, gravitation, and cosmology
Issue number6
Publication statusPublished - 11 Sept 2012


  • astro-ph.CO
  • gr-qc


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