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Issue A&A
Volume 413, Number 3, January III 2004
Page(s) 799 - 805
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20031540



A&A 413, 799-805 (2004)
DOI: 10.1051/0004-6361:20031540

Scalar fields properties for flat galactic rotation curves

S. Fay

Laboratoire Univers et Théories, CNRS-FRE 2462, Observatoire de Paris, 92195 Meudon Cedex, France
(Received 21 May 2003 / Accepted 25 September 2003)

Abstract
The whole class of minimally coupled and massive scalar fields which may be responsible for flattening of galactic rotation curves is found. An interesting relation with a class of scalar-tensor theories able to isotropise anisotropic models of Universe is shown. The resulting metric is found and its stability and scalar field properties are tested with respect to the presence of a second scalar field or a small perturbation of the rotation velocity at galactic outer radii.


Key words: galaxies: kinematics and dynamics -- cosmology: dark matter -- cosmology: theory




© ESO 2004

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