Method
NumCosmoHICosmoYp_4He
Declaration [src]
gdouble
nc_hicosmo_Yp_4He (
NcHICosmo* cosmo
)
Description [src]
Gets the primordial Helium mass fraction, i.e., $$Y_p = \frac{m_\mathrm{He}n_\mathrm{He}} {m_\mathrm{He}n_\mathrm{He} + m_\mathrm{H}n_\mathrm{H}},$$ where $m_\mathrm{He}$, $n_\mathrm{He}$, $m_\mathrm{H}$ and $m_\mathrm{H}$ are respectively Helium-4 mass and number density and Hydrogen-1 mass and number density.