darkhistory.physics.peebles_C¶
- darkhistory.physics.peebles_C(xHII, rs)¶
Hydrogen Peebles C coefficient.
This is the ratio of the total rate for transitions from n = 2 to the ground state to the total rate of all transitions, including ionization.
- Parameters:
- xHIIfloat
The ionization fraction nHII/nH.
- rsfloat
The redshift in 1+z.
- Returns:
- float
The Peebles C factor.