darkhistory.physics.xe_Saha¶
-
darkhistory.physics.
xe_Saha
(rs, species)¶ Saha equilibrium ionization value for H and He.
Parameters: - rs : float
The redshift in 1+z.
- species : {‘HI’, ‘HeI’}
The relevant species.
Returns: - float
The Saha equilibrium xe.
Notes
See astro-ph/9909275 and 1011.3758 for details.