On Wed, 2008-05-21 at 21:54 +0200, Daniel Carrera wrote:
> Ian Lynch wrote:
> > Bit like neutrinos. ISTR that neutrinos have a mean free path of 144
> > light years in iron so they are pretty difficult to detect but they do
> > have a notional mass. I think the calcs showed that neutrinos couldn't
> > be responsible for dark matter. Probably something in wikipedia about it
> > if I could be bothered to look it up :-)
> 
> No, neutrinos can't account for dark matter. Then again, we don't know 
> of anything that can except for things that we don't know exist - e.g. 
> undiscovered fundamental particles, interactions with a parallel 
> universe (yes, some people have theorized this, I saw a seminar about 
> Brane Theory that touched on the subject).

Yes, I saw something about that too. String theory is dead long live the
Brane :-)

Ian
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