Journal Article

The influence of modified gravitational fields on motions of Keplerian objects at the far edge of the Solar system

Michael Sokaliwska, Hans-Jörg Fahr and Pavel Kroupa

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 407, issue 4, pages 2557-2564
Published in print October 2010 | ISSN: 0035-8711
Published online July 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.17085.x
The influence of modified gravitational fields on motions of Keplerian objects at the far edge of the Solar system

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We investigated the impact of three different modifications of Newtonian gravity on motions of Keplerian objects within the Solar system. These objects are located at distances of the order of the distance to the Oort Cloud. With these three modifications we took into account a heliocentric dark matter halo as was indicated by Diemand et al., modified Newtonian dynamics (MOND) and a vacuum-induced force due to a locally negative cosmological constant Λ derived by Fahr & Siewert. In gravitationally bound systems it turns out that all three modifications deliver the same qualitative results: initially circular orbits for the pure Newtonian case are forced to convert into ellipses with perihelion migrations. The quantitative consideration, however, of the orbital parameters showed strong differences between MOND on one side, and dark matter and Λ effects on the other side.

Keywords: gravitation; methods: numerical; celestial mechanics; Oort Cloud

Journal Article.  4542 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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