Method

NumCosmoDistanceacoustic_scale

Declaration [src]

gdouble
nc_distance_acoustic_scale (
  NcDistance* dist,
  NcHICosmo* cosmo
)

Description [src]

Compute the acoustic scale $l_A (z_\star)$ at $z_\star$ [nc_distance_decoupling_redshift()], \begin{equation} l_A(z_\star) = \pi \frac{D_t (z_\star)}{r_s (z_\star)}, \end{equation} where $D_t(z_\star)$ is the comoving transverse distance [nc_distance_transverse()] and $r_s(z_\star)$ is the sound horizon [nc_distance_sound_horizon()] both computed at $z_\star$.

Parameters

cosmo

Type: NcHICosmo

A NcHICosmo.

The data is owned by the caller of the method.

Return value

Type: gdouble

$l_A(z_\star)$.