On 21/12/2012 6:03 PM, Steve Willner wrote:
SW Dark matter is just matter. Its exact nature is
SW unknown except that most of it is non-baryonic.
In ,
writes:
Based on what is this conclusion reached?
Originally on abundances of light nuclides:
http://astro.berkeley.edu/~mwhite/darkmatter/bbn.html
Nowadays I think CMB fluctuations provide tighter constraints:
http://map.gsfc.nasa.gov/resources/camb_tool/index.html
Isn't it true that the reasons for the CMB spectrum are complete
guesswork? Originally before the discovery of Dark Energy, it was
thought that the spectrum was as a result of neutrinos? The previous
best model for CMB was known as "Mixed Dark Matter", which consisted of
80% CDM & 20% neutrinos. The Mixed Dark Matter model fit the CMB just as
well as Lambda-CDM did, and it still does, except that Dark Energy is
now the curve-fit-du-jour.
Mixed dark matter - Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/Mixed_dark_matter
Yousuf Khan