SciPy

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.

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