Combined Solar system and rotation curve constraints on MOND

Journal article

Authors/Editors

Angus, Garry

Research Areas

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Publication Details

Author list: Hees A, Famaey B, Angus GW, Gentile G

Publisher: Oxford University Press

Place: OXFORD

Publication year: 2016

Journal: Monthly Notices of the Royal Astronomical Society (0035-8711)

Journal acronym: MON NOT R ASTRON SOC

Volume number: 455

Issue number: 1

Start page: 449

End page: 461

Number of pages: 13

ISSN: 0035-8711

eISSN: 1365-2966

Languages: English-Great Britain (EN-GB)

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Abstract

The Modified Newtonian Dynamics (MOND) paradigm generically predicts that the external gravitational field in which a system is embedded can produce effects on its internal dynamics. In this communication, we first show that this external field effect (EFE) can significantly improve some galactic rotation curves fits by decreasing the predicted velocities of the external part of the rotation curves. In modified gravity versions of MOND, this EFE also appears in the Solar system and leads to a very good way to constrain the transition function of the theory. A combined analysis of the galactic rotation curves and Solar system constraints (provided by the Cassini spacecraft) rules out several classes of popular MOND transition functions, but leaves others viable. Moreover, we show that Laser Interferometer Space Antenna Pathfinder will not be able to improve the current constraints on these still viable transition functions.

Keywords

Ephemerides, galaxies: kinematics and dynamics

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