SciPy

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:
xHII : float

The ionization fraction nHII/nH.

rs : float

The redshift in 1+z.

Returns:
float

The Peebles C factor.

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