Paper (*cross-listing*): hep-ph/0601018
Date: Tue, 3 Jan 2006 15:32:00 GMT (16kb)

Title: Neutrino Condensation as Dark Energy

Authors: Fei Wang, Wenyu Wang, Jin Min Yang

Comments: 7 pages, 3 figs
\\
Motivated by the seeming coincidence of the neutrino mass scale and the dark
energy scale, we propose to explain the cosmic dark energy by neutrino
condensation. Similar to the idea of top-quark condensation, we assume that a
four-fermion interaction for the third-family neutrino is induced from some
unknown new dynamics which is strong enough to cause neutrino condensation. In
the low-energy effective theory the resultant composite scalar field with a
very small vev of about 10^{-3} eV is interpreted as the dark energy field. The
tiny neutrino masses can be generated from such a small vev without see-saw
mechanism.

\\ ( http://arXiv.org/abs/hep-ph/0601018 , 16kb)

Paper: astro-ph/0601248
Date: Wed, 11 Jan 2006 20:25:51 GMT (9kb)

Title: On Dark Matter Self-Interactions from Higher Dimensional Gravity

Authors: Nicolas Chatillon, Cosmin Macesanu, Aleksandr Pinzul and Mark Trodden

Comments: 4 pages, revtex 4

Report-no: SU-4252-821
\\
It has recently been suggested that in a brane world scenario with large
extra dimensions, short distance gravitational interactions can enhance the
dark matter scattering cross-section in a velocity dependent way. Such a
modification may then help to address possible problems with non-interacting
cold dark matter on galactic and sub-galactic scales. We argue that,
considering the singular character of the higher dimensional Newtonian
potential, the scattering cross-section is UV-dependent, depending ultimately
on the underlying quantum gravity theory considered. We demonstrate that for a
wide class of unitary short distance regularizations, the actual cross-section
is velocity-independent and does not significantly affect dark matter
substructure.

\\ ( http://arXiv.org/abs/astro-ph/0601248 , 9kb)