Constraining scalar fields with stellar kinematics and collisional dark matter
Abstract
The existence and detection of scalar fields could provide solutions to longstanding puzzles about the nature of dark matter, the dark compact objects at the centre of most galaxies, and other phenomena. Yet, selfinteracting scalar fields are very poorly constrained by astronomical observations, leading to great uncertainties in estimates of the mass m_{phi} and the selfinteracting coupling constant λ of these fields. To counter this, we have systematically employed available astronomical observations to develop new constraints, considerably restricting this parameter space. In particular, by exploiting precise observations of stellar dynamics at the centre of our Galaxy and assuming that these dynamics can be explained by a single boson star, we determine an upper limit for the boson star compactness and impose significant limits on the values of the properties of possible scalar fields. Requiring the scalar field particle to follow a collisional dark matter model further narrows these constraints. Most importantly, we find that if a scalar dark matter particle does exist, then it cannot account for both the darkmatter halos and the existence of dark compact objects in galactic nuclei.
 Publication:

Journal of Cosmology and Astroparticle Physics
 Pub Date:
 November 2010
 DOI:
 10.1088/14757516/2010/11/002
 arXiv:
 arXiv:1009.0019
 Bibcode:
 2010JCAP...11..002A
 Keywords:

 Astrophysics  Cosmology and Extragalactic Astrophysics;
 Astrophysics  Galaxy Astrophysics;
 General Relativity and Quantum Cosmology;
 High Energy Physics  Theory
 EPrint:
 23 pages, 8 figures