darkhistory.physics.C_He¶
-
darkhistory.physics.
C_He
(xHII, xHeII, rs, species)¶ Helium C coefficients.
These coefficients play a similar role to the Peebles C factor.
Parameters: - xHII : float
The HI ionization fraction nHII/nH.
- xHeII : float
The HeI ionization fraction nHeII/nH.
- rs : float
The redshift in 1+z.
- species : {‘singlet’, ‘triplet’}
The relevant helium C coefficient to return.
Returns: - float
The C coefficient.