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Which Particle would win the race?
I have read this question:
Neutrinos vs. Photons: Who wins the race across the galaxy?
https://en.wikipedia.org/wiki/Neutrino
And it made me curious.
The wiki article says that neutrinos travel at ...
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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 \...
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