Search PubMed⌕ Search

Biomedical subjects

P Sikivie

Publications and source records attributed to P Sikivie.

16 recordsLinked to original sources
PubMed2005

Results of a search for cold flows of dark matter axions.

Theoretical arguments predict that the distribution of cold dark matter in spiral galaxies has peaks in velocity space associated with nonthermalized flows of dark matter particles. We searched for the corresponding peaks in the spectrum of microwave photons from axion to photon conversion in a cavity detector for dark matter axions. We found none and place limits on the density of any local flow of axions as a function of the flow velocity dispersion over the axion mass range 1.98 to 2.17 microeV.

Journal Article↗
PubMed2001

Dark matter caustics.

The late infall of cold dark matter onto an isolated galaxy such as our own produces flows with definite velocity vectors at any physical point in the galactic halo. It also produces caustics which are places where the dark matter density is very large. The outer caustics are topological spheres whereas the inner caustics are rings. The self-similar model of galactic halo formation predicts that the caustic ring radii a(n) follow the approximate law a(n) approximately 1/n. In a recent study of 32 extended and well-measured galactic rotation curves, we found evidence for this law.

Journal Article↗