All Questions
7 questions
20
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3
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A thought experiment about neutrinos
I don't understand all the details of Dirac mass, Majorana mass, and many other "deep" notions.
I have in mind a very simple thought experiment.
Because of neutrino oscillations we know ...
- 4,448
8
votes
3
answers
1k
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If a neutrino has a rest frame, why can't a photon have a rest frame as well?
Concerning Rest Frame Wikipedia states:
For example, in the rest frame of a neutrino particle travelling from the Crab Nebula supernova to Earth the supernova occurred in the 11th Century AD only ...
- 221
3
votes
5
answers
4k
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A neutrino has rest-mass and travels at (near) $c$, why isn't its mass/ energy (nearly) infinite?
If the total energy of all three types of neutrinos exceeded an
average of 50 eV per neutrino, there would be so much mass in the
universe that it would collapse. This limit can be circumvented by
...
user59485
1
vote
3
answers
172
views
Why should a neutrino being nearly massless mean that they travel near the speed of light? [duplicate]
It seems to me that photons travel only at the speed of light due to some intrinsic property of photons but once a particle has mass, its mass (irrespective of how small this mass is) should have ...
- 2,288
0
votes
1
answer
416
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Is Helicity an intrinsic property of massive Neutrinos?
Hyperphysics states that, unlike an electron, the helicity of a neutrino is invariant because we cannot change to a reference frame where it is different:
This and subsequent experiments have ...
- 569
0
votes
1
answer
191
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Why is it said that the lightest neutrino is relativistic?
The neutrinos from the cosmic neutrino background have a temperature of $T_\nu=1.945K$, that is an energy of $E=\frac{3}{2}k_BT_\nu$. If the neutrino's mass is around $0.1eV$
$$ \frac{3}{2}k_BT_\nu<...
- 3
-6
votes
2
answers
114
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Are high-energy neutrinos subject of relativistic time dilation like muons are?
Synchrotron experiments and cosmic-rays hitting our atmosphere have proved many times that high-energy massive muons moving with speeds close to the speed of light are subject to relativistic length ...
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