darkhistory.physics.alpha_recomb¶
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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.