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Recovering a MOND-like acceleration law in mimetic gravity
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Number of Authors: 12017 (English)In: Classical and quantum gravity, ISSN 0264-9381, E-ISSN 1361-6382, Vol. 34, no 18, article id 185006Article in journal (Refereed) Published
Abstract [en]

We reconsider the recently proposed mimetic gravity, focusing in particular on whether the theory is able to reproduce the inferred flat rotation curves of galaxies. We extend the theory by adding a non-minimal coupling between matter and mimetic field. Such coupling leads to the appearance of an extra force which renders the motion of test particles non-geodesic. By studying the weak field limit of the resulting equations of motion, we demonstrate that in the Newtonian limit the acceleration law induced by the non-minimal coupling reduces to a modified Newtonian dynamics (MOND)-like one. In this way, it is possible to reproduce the successes of MOND, namely the explanation for the flat galactic rotation curves and the Tully-Fisher relation, within the framework of mimetic gravity, without the need for particle dark matter. The scale-dependence of the recovered acceleration scale opens up the possibility of addressing the missing mass problem not only on galactic but also on cluster scales: we defer a full study of this issue, together with a complete analysis of fits to spiral galaxy rotation curves, to an upcoming companion paper.

Place, publisher, year, edition, pages
2017. Vol. 34, no 18, article id 185006
Keywords [en]
dark matter, rotation curves, mimetic gravity, modified gravity, non-minimal coupling
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-146959DOI: 10.1088/1361-6382/aa838bISI: 000408690400001OAI: oai:DiVA.org:su-146959DiVA, id: diva2:1142429
Available from: 2017-09-19 Created: 2017-09-19 Last updated: 2017-09-19Bibliographically approved

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Vagnozzi, Sunny
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