Function

NumCosmoHICosmoQLineardE

Declaration [src]

gdouble
nc_hicosmo_qlinear_dE (
  gdouble z2,
  gdouble z1,
  gdouble q,
  gdouble qp
)

Description [src]

This function returns the difference of the normalized Hubble function computed at z1 and z2: $$ \Delta E(z) = \exp \int_{z_1}^{z_2} \frac{1 + q(z^\prime)}{1 + z^\prime} dz^\prime, $$ where $q(z) = q_0 + q_1 (z - z_1)$, being $q_0$ = q, $q_1$ = qp and $z_1$ = z1.

Parameters

z2

Type: gdouble

Final redshift.

z1

Type: gdouble

Initial redshift.

q

Type: gdouble

Constant parameter.

qp

Type: gdouble

Constant parameter that multiplies (z - z1).

Return value

Type: gdouble

$\Delta E(z) = \left(\frac{1+z_2}{1+z_1}\right)^{1 + q_0 - q_1(1 + z_1)} e^{q_1 (z_2 - z_1)}$.