Method
NumCosmoDistancedrag_redshift
Declaration [src]
gdouble
nc_distance_drag_redshift (
NcDistance* dist,
NcHICosmo* cosmo
)
Description [src]
Drag redshift is the epoch at which baryons were released from photons.
If the dist object constains a NcRecomb object, it calculates the drag
redshift through the recombination history. Otherwise, it computes $z_d$
using the fitting formula given in [Eisenstein & Hu (1998)][XEisenstein1998] [arXiv],
$$z_d = \frac{1291 (\Omega_{m0} h^2)^{0.251}}{(1 + 0.659 (\Omega_{m0} h^2)^{0.828})}
\left(1 + b_1 (\Omega_{b0} h^2)^{b_2}\right),$$
where $\Omega_{b0} h^2$ [nc_hicosmo_Omega_b0h2()] and $\Omega_{m0} h^2$ [nc_hicosmo_Omega_m0h2()]
are, respectively, the baryonic and matter density parameters times the square
of the dimensionless Hubble parameter $h$, $H_0 = 100 \, h \, \text{km/s} \, \text{Mpc}^{-1}$.
The parameters $b_1$ and $b_2$ are given by
$$b_1 = 0.313 (\Omega_{m0} h^2)^{-0.419} \left(1 + 0.607 (\Omega_{m0} h^2)^{0.674}\right) \;
\text{and} \; b_2 = 0.238 (\Omega_{m0} h^2)^{0.223}.$$.
Parameters
cosmo-
Type:
NcHICosmoA
NcHICosmo.The data is owned by the caller of the method.