Is it true that neutrinos are billions of times more than all baryonic matter and electrons?

Question

Here, it mentions that the total number of electrons in the observable universe is around 10^80, while this states that the total number of baryons are again, around 10^80. This article says that the total number of neutrinos seems to be around 1.2*10^89. It follows that the total number of neutrinos are a billion times more than the total number of baryons and electrons combined. Is this ballpark estimate correct ?

Answer 1

The neutrinos in question are primordial neutrinos, often called the cosmic neutrino background by analogy with the cosmic microwave background.

Like the CMB, these neutrinos originate from the Big Bang and specifically from the moment when the temperature fell too low for the weak force interactions to keep the neutrinos in equilibrium with everything else. Calculating the number density of these neutrinos is complicated but reasonably well understood as it involves only energy regimes that we have probed experimentally. The result is that the ratio of the primordial neutrinos to baryons is indeed about $10^9$.