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| double | a0 | Read / Write / Construct |
| gboolean | a0-conformal-normal | Read / Write / Construct |
| double | abstol | Read / Write / Construct |
| NcDistance * | dist | Read / Write / Construct Only |
| double | reltol | Read / Write / Construct |
| double | zf | Read / Write / Construct |
| #define | NC_SCALEFACTOR_DEFAULT_ZF |
| #define | NC_SCALEFACTOR_DEFAULT_A0 |
| #define | NC_SCALEFACTOR_DEFAULT_RELTOL |
| #define | NC_SCALEFACTOR_DEFAULT_ABSTOL |
| #define | NC_SCALEFACTOR_OMEGA_K_ZERO |
| #define | NC_SCALEFACTOR_MIN_ETA_STEP |
Integrates the first order Friedmann equation,
$$E^2 = \frac{\rho}{\rho_{\mathrm{crit}0}} + \Omega_{k0} x^2.$$ Where
${\mathrm{crit}0}$ is the critical density today [nc_hicosmo_crit_density()],
$E = H / H_0$ is the dimensionless Hubble function [nc_hicosmo_E()]
and $\Omega_{k0}$ is the curvature parameter today [nc_hicosmo_Omega_k0()].
NcScalefactor * nc_scalefactor_new (const gdouble zf,NcDistance *dist);
Creates a new NcScalefactor valid for calculations in the $[0, z_f]$ interval.
NcScalefactor *
nc_scalefactor_ref (NcScalefactor *a);
Increases the reference count of a
by one.
void
nc_scalefactor_free (NcScalefactor *a);
Decreases the reference count of a
by one.
void
nc_scalefactor_clear (NcScalefactor **a);
If *a
is different from NULL, decreases the reference
count of *a
by one and sets *a
to NULL.
void nc_scalefactor_prepare_if_needed (NcScalefactor *a,NcHICosmo *cosmo);
FIXME
void nc_scalefactor_set_zf (NcScalefactor *a,const gdouble zf);
Sets the final redshift of the integration.
void nc_scalefactor_require_zf (NcScalefactor *a,const gdouble zf);
Requires the final redshift of at least $z_f$ = zf
.
void nc_scalefactor_set_a0 (NcScalefactor *a,const gdouble a0);
Sets the value of the scale factor today.
void nc_scalefactor_set_reltol (NcScalefactor *a,const gdouble reltol);
Sets the relative tolerance of the integration.
void nc_scalefactor_set_abstol (NcScalefactor *a,const gdouble abstol);
Sets the absolute tolerance of the integration.
void nc_scalefactor_set_a0_conformal_normal (NcScalefactor *a,gboolean enable);
When enable
is TRUE, it sets the value of the scale factor
today $a_0$, assuming that the conformal hypersurface
the spatial hypersurface where ($a=1$) hascurvature
equals to 1Mpc, i.e., $1/\sqrt{K} = 1\,\mathrm{Mpc}$.
If enable
is FALSE it lets $a_0$ untouched. *
gdouble
nc_scalefactor_get_zf (NcScalefactor *a);
Gets the current final redshift $z_f$.
gdouble
nc_scalefactor_get_a0 (NcScalefactor *a);
Gets the current value of the scale factor today $a_0$.
gdouble
nc_scalefactor_get_reltol (NcScalefactor *a);
Gets the current relative tolerance.
gdouble
nc_scalefactor_get_abstol (NcScalefactor *a);
Gets the current absolute tolerance.
gdouble nc_scalefactor_eval_z_eta (NcScalefactor *a,const gdouble eta);
Calculates the value of the redshift in $\eta$, i.e., $z(\eta)$.
gdouble nc_scalefactor_eval_a_eta (NcScalefactor *a,const gdouble eta);
Calculates the value of the scale factor in $\eta$, i.e., $a(\eta)$.
gdouble nc_scalefactor_eval_eta_z (NcScalefactor *a,const gdouble z);
Calculates the value of the conformal time at $z$, i.e., $\eta(z)$.
gdouble nc_scalefactor_eval_eta_x (NcScalefactor *a,const gdouble x);
Calculates the value of the conformal time at $x$, i.e., $\eta(z(x))$.
gdouble nc_scalefactor_eval_t_eta (NcScalefactor *a,const gdouble eta);
Calculates the value of the cosmic time at $\eta$, i.e., $t(\eta)$.
gdouble nc_scalefactor_eval_eta_t (NcScalefactor *a,const gdouble t);
Calculates the value of the conformal time at $t$, i.e., $\eta(t)$.
“a0” property “a0” double
Scale factor today a_0.
Owner: NcScalefactor
Flags: Read / Write / Construct
Allowed values: >= 0
Default value: 1
“a0-conformal-normal” property“a0-conformal-normal” gboolean
Scale factor today a_0 from normalized curvature radius.
Owner: NcScalefactor
Flags: Read / Write / Construct
Default value: FALSE
“abstol” property “abstol” double
Absolute tolerance.
Owner: NcScalefactor
Flags: Read / Write / Construct
Allowed values: >= 0
Default value: 0
“dist” property“dist” NcDistance *
Distance object.
Owner: NcScalefactor
Flags: Read / Write / Construct Only
“reltol” property “reltol” double
Relative tolerance.
Owner: NcScalefactor
Flags: Read / Write / Construct
Allowed values: [0,1]
Default value: 1e-13