Symbol in context

$D_A$

This entry links every published equation using this exact notation. Its meaning may change between equations.

Meanings in context

Article-grounded definition

the angular diameter distance to that same epoch.

\theta_* = \frac{r_*}{D_A(z_*)}

This equation states an equality: the expressions on both sides have the same value under the article’s assumptions.

D_A(z_*)

This mathematical expression combines the displayed quantities; its precise role follows from the surrounding article text.

D_A(z_*)

This mathematical expression combines the displayed quantities; its precise role follows from the surrounding article text.