Paper (*cross-listing*): gr-qc/0607057
Date: Fri, 14 Jul 2006 02:24:38 GMT (68kb)

Title: Galactic Halos are Einstein Clusters of WIMPs

Authors: Kayll Lake

Comments: 4 pages revtex4 1 figure
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It is shown that an Einstein cluster of WIMPs, WIMPs on stable circular
geodesic orbits generating the static spherically symmetric gravitational field
of a galactic halo, can exactly reproduce the rotation curve of any galaxy
simply by adjusting the local angular momentum distribution and consequent
number distribution of the WIMPs. No new physics is involved (assuming the
forthcoming discovery of WIMPs). Further, stability of the orbits can require
an inner truncation of the halo and an explicit example of this is given. The
requisite junction conditions turn out to be trivial to satisfy. There is no
exact Newtonian counterpart to the model presented since pure Newtonian gravity
fails to account for the contribution made by the angular momentum distribution
of the particles in creating the gravitational field. In effect, a galactic
halo is supported by the hoop stresses created by the orbiting WIMPs.

http://arXiv.org/abs/gr-qc/0607057