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NumCosmo Reference Manual | ![]() |
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In this section define our notation with respect to the recombination module, more details in [1]. We refer to the total number of hydrogen nucleus (ionized or not) as
where is the number or protons. We refer to the hydrogen atoms as and ionized hydrogen as and therefore . In the same way for the helium the number of helium nuclei is and the single and double ionized as and respectively.
We also we the helium primordial abundance as the ratio of the helium mass to the total baryonic mass, i.e.,
where and are the hydrogen and helium mass.
The element abundances are define as the ratio of the element by the total number of protons:
where and represent the free electrons. These fractions have the following properties:
We also define the number of free electrons as . Assuming a neutral universe we have