Paper: astro-ph/0508572
Date: Fri, 26 Aug 2005 06:04:26 GMT (7kb)

Title: Observational Evidence for Extra Dimensions from Dark Matter

Authors: Bo Qin, Ue-Li Pen, Joseph Silk

Comments: 4 pages, no figure, submitted to PRL
\\
Recent astronomical observations of systems of dark matter, which have been
cited as providing possible support for self-interacting cold dark matter, may
provide evidence for the extra dimensions predicted by superstring scenarios.
We find that the properties of the required dark matter self-interaction are
precisely the consequences of a world with 3 large extra dimensions of size
\~1nm, where gravity follows the r^{-5} law at scales below ~1nm. From the
cross sections measured for various dark matter systems, we also constrain the
mass of dark matter particles to be m_x ~ 3*10^{-16} proton mass, consistent
with the mass of axions.

\\ ( http://arXiv.org/abs/astro-ph/0508572 , 7kb)