Welcome to Hubert L. Bray's
Dark Matter Webpage.
Paper:
``On Dark Matter, Spiral Galaxies, and the Axioms of General Relativity,'' H. Bray, April 22, 2010.
Abstract:
Beginning with a geometric motivation for dark matter going back to the
axioms of general relativity, we show how scalar field dark matter,
which naturally forms dark matter density waves due to its wave nature,
may cause the observed barred spiral pattern density waves in many disk
galaxies and triaxial shapes with plausible brightness profiles in many
elliptical galaxies. If correct, this would provide a unified
explanation for spirals and bars in spiral galaxies and for the
brightness profiles of elliptical galaxies. We compare the results of
preliminary computer simulations with photos of actual galaxies.
Spiral Galaxy Simulation using Matlab:
spiralgalaxy.m
Elliptical Galaxy Simulation using Matlab:
ellipticalgalaxy.m
Right click on the above links to download the files. The two .m
files can be run using Matlab. As these .m files create many
image files, we suggest creating a new directory for each run and
placing a copy of the .m file in that directory. Then change to
that directory inside Matlab and execute the command line. If you
open the .m files in the Matlab editor, example command lines are
listed. There are also example command lines in the paper listed
above as well.
Have fun!
Hubert L. Bray
Mathematics Department
Duke University, Box 90320
Durham, NC 27708 USA
bray@math.duke.edu