SciPy

darkhistory.physics.alpha_recomb

darkhistory.physics.alpha_recomb(T_m, species)

Case-B recombination coefficient.

Parameters:
T_m : float

The matter temperature.

species : {‘HI’, ‘HeI_21s’, ‘HeI_23s’}

The species of interest.

Returns:
float

Case-B recombination coefficient in cm-3s-1.

Notes

For HeI, returns beta with respect to the 2s state, in agreement with convention in RECFAST.

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