Extra dimensions could leave trace in Big Bang's aftermath (Feb 14)
http://physicsweb.org/article/news/11/2/12
Most people are perfectly content with three dimensions to carry out
daily tasks -- or four if they take time into account. String
theorists,
on the other hand, think that many more dimensions are needed to
develop
a comprehensive theory of the universe's phenomena. Now, physicists in
the US claim that these extra dimensions, **which have so far evaded
attempts to be found, could have effects that show up in** radiation
left
by the Big Bang (Phys. Rev. Lett. 98 051301).