ccl_power.c File Reference

#include "ccl_core.h"
#include "ccl_utils.h"
#include "math.h"
#include "stdio.h"
#include "stdlib.h"
#include "gsl/gsl_integration.h"
#include "gsl/gsl_interp.h"
#include "gsl/gsl_spline.h"
#include "ccl_placeholder.h"
#include "ccl_background.h"
#include "ccl_power.h"
#include "ccl_error.h"
#include "class.h"
#include "ccl_params.h"

Data Structures
struct	eh_struct
struct	SigmaR_pars

Functions
void	ccl_cosmology_compute_power (ccl_cosmology *cosmo, int *status)
double	ccl_linear_matter_power (ccl_cosmology *cosmo, double k, double a, int *status)
double	ccl_nonlin_matter_power (ccl_cosmology *cosmo, double k, double a, int *status)
double	ccl_sigmaR (ccl_cosmology *cosmo, double R, int *status)
double	ccl_sigma8 (ccl_cosmology *cosmo, int *status)

Function Documentation

ccl_cosmology_compute_power()

void ccl_cosmology_compute_power	(	ccl_cosmology *	cosmo,
		int *	status
	)

Compute the power spectrum and create a 2d spline P(k,z) to be stored in the cosmology structure.

Parameters

cosmo	Cosmological parameters
status	Status flag. 0 if there are no errors, nonzero otherwise. For specific cases see documentation for ccl_error.c

Returns

void

ccl_linear_matter_power()

double ccl_linear_matter_power	(	ccl_cosmology *	cosmo,
		double	k,
		double	a,
		int *	status
	)

Linear matter power spectrum. Returns P_lin(k,a) [Mpc^3] for given cosmology, using the method specified in cosmo->config.transfer_function_method.

Parameters

cosmo	Cosmology parameters and configurations
k	Fourier mode, in [1/Mpc] units
a	scale factor, normalized to 1 for today
status	Status flag. 0 if there are no errors, nonzero otherwise. For specific cases see documentation for ccl_error.c

Returns

P_lin(k,a).

ccl_nonlin_matter_power()

double ccl_nonlin_matter_power	(	ccl_cosmology *	cosmo,
		double	k,
		double	a,
		int *	status
	)

Non-linear matter power spectrum. Returns P_NL(k,a) [Mpc^3] for given cosmology, using the method specified in cosmo->config.transfer_function_method and cosmo->config.matter_power_spectrum_method.

Parameters

cosmo	Cosmology parameters and configurations
k	Fourier mode, in [1/Mpc] units
a	scale factor, normalized to 1 for today
status	Status flag. 0 if there are no errors, nonzero otherwise. For specific cases see documentation for ccl_error.c

Returns

P_NL(k,a).

ccl_sigma8()

double ccl_sigma8	(	ccl_cosmology *	cosmo,
		int *	status
	)

Computes sigma_8, variance of the matter density field with (top-hat) smoothing scale R = 8 Mpc/h, from linear power spectrum. Returns sigma_8 for specified cosmology.

Parameters

cosmo	Cosmology parameters and configurations
status	Status flag. 0 if there are no errors, nonzero otherwise. For specific cases see documentation for ccl_error.c

Returns

sigma_8.

ccl_sigmaR()

double ccl_sigmaR	(	ccl_cosmology *	cosmo,
		double	R,
		int *	status
	)

Variance of the matter density field with (top-hat) smoothing scale R [Mpc]. Returns sigma(R) for specified cosmology at a = 1.

Parameters

cosmo	Cosmology parameters and configurations
R	Smoothing scale, in [Mpc] units
status	Status flag. 0 if there are no errors, nonzero otherwise. For specific cases see documentation for ccl_error.c

Returns

sigma(R).