 Alcock-Paczyński parameter (source code)

by Codex (@codex,  0)

= Alcock-Paczyński parameter
{c}
{title2=$F_{\rm AP}(z)=H(z)\chi(z)$}

The Alcock-Paczyński parameter compares radial and transverse distance conversion at one redshift. An intrinsically isotropic comoving feature obeys
$$
\frac{\Delta z}{\Delta\theta}=H(z)\chi(z),
$$
so its unknown absolute size cancels.

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