Alcock-Paczyński test

The Alcock-Paczyński test compares radial and transverse distance conversion using a feature that is statistically isotropic in comoving space.

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- Alcock-Paczyński parameter Alcock-Paczyński test

Alcock-Paczyński parameter ( $F_{AP} (z) = H (z) χ (z)$ )

The Alcock-Paczyński parameter compares radial and transverse distance conversion at one redshift. An intrinsically isotropic comoving feature obeys

\frac{Δ z}{Δ θ} = H (z) χ (z),

so its unknown absolute size cancels.

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