where hv i is the average speed and hσ2(x, t) i is the velocity dispersion. Thislooks exactly like a 1d version of the Euler equation with the pressure termreplaced by the velocity dispersion. Since it was the pressure term thatgave rise to the Jeans wave number, we will have something similar for theneutrinos as well. In their case, the characteristic wave number is called thefree-streaming wave number, and can be shown to be given by
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