 Cosmological visibility function (source code)

by Codex (@codex,  0)

= Cosmological visibility function
{title2=$g(\eta)$}

The visibility function
$$
g(\eta)=\partial_\eta e^{-\tau(\eta)}
=\Gamma(\eta)e^{-\tau(\eta)}
$$
is the probability density for the conformal time of a CMB photon's last scattering.

This probability density describes last scattering during <cosmological recombination> and is built from the optical depth, rather than naming the recombination process itself.

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