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| double | a | Read / Write / Construct Only |
| double | b | Read / Write / Construct Only |
| double | c | Read / Write / Construct Only |
| double | critical-delta | Read / Write / Construct Only |
Object implementation to compute the halo bias function given the Sheth-Tormen mass function for elliptical collapse. A description of the function is given below. Check nc_halo_bias.c for a description of halo biases and nc_multiplicity_func_st.c for the Sheth-Tormen mass function.
The Sheth-Tormen bias can be obtained by considering an approximation where the fluctuations around the background density contrats are described by a constant barrier that depends on the collapse. For an elliptical collapse, the bias is given by \begin{align} b(\nu)=1+\frac{1}{\delta_{\mathrm{sc}}(z)} \left[a \nu^2+ b\left(a \nu^2\right)^{1-c} -\frac{\left(a \nu^2\right)^c}{\sqrt{a}\left(a \nu^2\right)^c+b(1-c)(1-c / 2)}\right] \end{align} where $b(\nu)$ is the bias, $\delta_c$ is the critical threshold, $\nu = \frac{\delta_c}{\sigma}$ and $(a, b, c)$ are free parameters of the mass function that dictates the shape of the barrier.
The user must provide input the values: NcHaloMassFunction
, delta_c
, a
, p
- nc_halo_bias_st_spher_new_full().
NcHaloBiasSTEllip *
nc_halo_bias_st_ellip_new (NcHaloMassFunction *mfp);
Creates a new NcHaloBiasSTEllip object with undefined parameters.
[constructor]
NcHaloBiasSTEllip * nc_halo_bias_st_ellip_new_full (NcHaloMassFunction *mfp,gdouble delta_c,gdouble a,gdouble b,gdouble c);
Creates a new NcHaloBiasSTEllip object with the input values.
[constructor]
void nc_halo_bias_st_ellip_set_delta_c (NcHaloBiasSTEllip *biasf_st_ellip,gdouble delta_c);
Sets the value delta_c
to the “critical-delta” property.
gdouble
nc_halo_bias_st_ellip_get_delta_c (const NcHaloBiasSTEllip *biasf_st_ellip);
void nc_halo_bias_st_ellip_set_a (NcHaloBiasSTEllip *biasf_st_ellip,gdouble a);
Sets the value a
to the “a” property.
gdouble
nc_halo_bias_st_ellip_get_a (const NcHaloBiasSTEllip *biasf_st_ellip);
void nc_halo_bias_st_ellip_set_b (NcHaloBiasSTEllip *biasf_st_ellip,gdouble b);
Sets the value b
to the “b” property.
gdouble
nc_halo_bias_st_ellip_get_b (const NcHaloBiasSTEllip *biasf_st_ellip);
void nc_halo_bias_st_ellip_set_c (NcHaloBiasSTEllip *biasf_st_ellip,gdouble c);
Sets the value c
to the “c” property.
gdouble
nc_halo_bias_st_ellip_get_c (const NcHaloBiasSTEllip *biasf_st_ellip);
“a” property “a” double
Parameter that dictates the shape of the barrier. (check limits values)
Owner: NcHaloBiasSTEllip
Flags: Read / Write / Construct Only
Default value: 0.707
“b” property “b” double
Parameter that dictates the shape of the barrier. (check limits values)
Owner: NcHaloBiasSTEllip
Flags: Read / Write / Construct Only
Default value: 0.5
“c” property “c” double
Parameter that dictates the shape of the barrier. (check limits values)
Owner: NcHaloBiasSTEllip
Flags: Read / Write / Construct Only
Default value: 0.6