Take the 2-minute tour ×
Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. It's 100% free, no registration required.

I've read that neutrinos in supernova can be affected by "neutrino refraction." Is this analagous to the refraction of light, and if so, is the speed of these neutrinos similarly reduced from their near c speeds via this index of refraction?

share|improve this question
add comment

1 Answer 1

up vote 3 down vote accepted

First, check this reference on Wikipedia.

Now, it is generally true that the "speed" (or, more accurately, the dispersion relation) of any particle is affected by a medium, where it travels. Well, of course, if the particle interacts with the medium.

For neutrinos the "slowing down" itself is absolutely negligible even in very dense media. What is important is that interaction of the electron neutrino with ordinary matter is much stronger, so it affects the patterns of neutrino oscillations -- the effect is known as MSW effect.

Finally, this is not particularly related to supernovae. The idea behind interest in supernovae is that during an explosion there are a lot of neutrinos so one must account for the "neutrino matter" and its effect on oscillations as well.

share|improve this answer
    
Thank you Kostya for the very helpful explaination. –  Michael Luciuk May 9 '11 at 11:28
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.