All Questions
4
questions
0
votes
1
answer
77
views
Neutrino temperature
I was wondering if anybody knows the relation between the photon temperature $T$ and neutrino temperature $T_{\nu}$? And why this can be written as
$$T_{\nu}=\left(\frac{4}{11}\right)^{1 / 3} T \...
- 1
0
votes
1
answer
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Limiting the mass of the neutrino for a relativistic case
I came across a question that states
What mass would a neutrino need to still be relativistic today (T = 2.37K) ?
So for a particle to be relativistic we need $pc \gg mc^2$
Well Neutrino was ...
- 3,122
2
votes
0
answers
256
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Using the boltzmann equation to find neutrino decoupling temperature
I'm an undergraduate student currently following a particle astrophysics lecture. I was reading some stuff about the neutrinos decoupling before the $e^+ e^-$ annihilations. It's possible to quickly ...
- 21
4
votes
1
answer
1k
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Neutrino decoupling and units
I have a problem that states:
In the early Universe, neutrinos can be created and destroyed by the process:
\begin{equation}
\nu \bar{\nu} \leftrightarrow e^{+}e^{-}
\end{equation}
The thermally ...
- 2,537