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Title: Reconciling MOND and dark matter?

Abstract

Observations of galaxies suggest a one-to-one analytic relation between the inferred gravity of dark matter at any radius and the enclosed baryonic mass, a relation summarized by Milgrom's law of modified Newtonian dynamics (MOND). However, present-day covariant versions of MOND usually require some additional fields contributing to the geometry, as well as an additional hot dark matter component to explain cluster dynamics and cosmology. Here, we envisage a slightly more mundane explanation, suggesting that dark matter does exist but is the source of MOND-like phenomenology in galaxies. We assume a canonical action for dark matter, but also add an interaction term between baryonic matter, gravity, and dark matter, such that standard matter effectively obeys the MOND field equation in galaxies. We show that even the simplest realization of the framework leads to a model which reproduces some phenomenological predictions of cold dark matter (CDM) and MOND at those scales where these are most successful. We also devise a more general form of the interaction term, introducing the medium density as a new order parameter. This allows for new physical effects which should be amenable to observational tests in the near future. Hence, this very general framework, which can be furthermoremore » related to a generalized scalar-tensor theory, opens the way to a possible unification of the successes of CDM and MOND at different scales.« less

Authors:
; ;  [1];  [2]
  1. SISSA/ISAS, Via Beirut 2-4, 34014 Trieste (Italy)
  2. Institut d'Astronomie et d'Astrophysique, Universite Libre de Bruxelles, CP 226, Bruxelles (Belgium)
Publication Date:
OSTI Identifier:
22156942
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2009; Journal Issue: 03; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BARYONS; CLASSICAL MECHANICS; COSMOLOGY; DENSITY; FIELD EQUATIONS; GALAXIES; GRAVITATION; INTERACTIONS; NONLUMINOUS MATTER; ORDER PARAMETERS; SCALARS; TENSORS

Citation Formats

Bruneton, Jean-Philippe, Liberati, Stefano, Sindoni, Lorenzo, and Famaey, Benoit. Reconciling MOND and dark matter?. United States: N. p., 2009. Web. doi:10.1088/1475-7516/2009/03/021.
Bruneton, Jean-Philippe, Liberati, Stefano, Sindoni, Lorenzo, & Famaey, Benoit. Reconciling MOND and dark matter?. United States. https://doi.org/10.1088/1475-7516/2009/03/021
Bruneton, Jean-Philippe, Liberati, Stefano, Sindoni, Lorenzo, and Famaey, Benoit. 2009. "Reconciling MOND and dark matter?". United States. https://doi.org/10.1088/1475-7516/2009/03/021.
@article{osti_22156942,
title = {Reconciling MOND and dark matter?},
author = {Bruneton, Jean-Philippe and Liberati, Stefano and Sindoni, Lorenzo and Famaey, Benoit},
abstractNote = {Observations of galaxies suggest a one-to-one analytic relation between the inferred gravity of dark matter at any radius and the enclosed baryonic mass, a relation summarized by Milgrom's law of modified Newtonian dynamics (MOND). However, present-day covariant versions of MOND usually require some additional fields contributing to the geometry, as well as an additional hot dark matter component to explain cluster dynamics and cosmology. Here, we envisage a slightly more mundane explanation, suggesting that dark matter does exist but is the source of MOND-like phenomenology in galaxies. We assume a canonical action for dark matter, but also add an interaction term between baryonic matter, gravity, and dark matter, such that standard matter effectively obeys the MOND field equation in galaxies. We show that even the simplest realization of the framework leads to a model which reproduces some phenomenological predictions of cold dark matter (CDM) and MOND at those scales where these are most successful. We also devise a more general form of the interaction term, introducing the medium density as a new order parameter. This allows for new physical effects which should be amenable to observational tests in the near future. Hence, this very general framework, which can be furthermore related to a generalized scalar-tensor theory, opens the way to a possible unification of the successes of CDM and MOND at different scales.},
doi = {10.1088/1475-7516/2009/03/021},
url = {https://www.osti.gov/biblio/22156942}, journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 03,
volume = 2009,
place = {United States},
year = {2009},
month = {3}
}