Hi,
I am running CAMB for different neutrino masses, say Sum_m_nu=0-10 eV, considering a normal hierarchy (just change the neutrino mass, Omega_nu h^2, in the default input, params.ini). I noticed that the program outputs Z_eq, the redshift for matter radiation equality, but the value does not change with the neutrino mass. This seems weird. My understanding is that by increasing neutrino mass, matter radiation equality should occur earlier, since neutrinos became non-relativistic earlier, therefore increasing the (non relativistic matter) mass. Why isn't CAMB accounting for this effect?
Any help will be appreciated,
Dan
Z_eq in CAMB?
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Re: Z_eq in CAMB?
The program outputs z_EQ (if v_nu=1), i.e. equality defined as though the neutrinos are relativistic. There are of course other possible definitions which are more physical (but harder to calculate).