darkhistory.physics.alpha_recomb

darkhistory.physics.alpha_recomb(T_m, species)

Case-B recombination coefficient.

Parameters:

T_mfloat

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.