Unifying all mass discrepancies with one effective gravity law?

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 deep...

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Bibliographic Details
Published in:arXiv.org 2012-07
Main Authors: Zhao, HongSheng, Famaey, Benoit
Format: Article
Language:English
Subjects:
Acceleration
Baryons
Galactic clusters
Galaxies
Gravitation theory
Matter & antimatter
Offsets
Potential theory
Stars & galaxies
System effectiveness
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.1207.6232