/usr/include/gnuastro/cosmology.h is in libgnuastro-dev 0.5-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Cosmological calculations.
This is part of GNU Astronomy Utilities (Gnuastro) package.
Original author:
Mohammad Akhlaghi <akhlaghi@gnu.org>
Contributing author(s):
Copyright (C) 2015, Free Software Foundation, Inc.
Gnuastro is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
Gnuastro is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with Gnuastro. If not, see <http://www.gnu.org/licenses/>.
**********************************************************************/
#ifndef __GAL_COSMOLOGY_H__
#define __GAL_COSMOLOGY_H__
/* Include other headers if necessary here. Note that other header files
must be included before the C++ preparations below */
/* C++ Preparations */
#undef __BEGIN_C_DECLS
#undef __END_C_DECLS
#ifdef __cplusplus
# define __BEGIN_C_DECLS extern "C" {
# define __END_C_DECLS }
#else
# define __BEGIN_C_DECLS /* empty */
# define __END_C_DECLS /* empty */
#endif
/* End of C++ preparations */
/* Actual header contants (the above were for the Pre-processor). */
__BEGIN_C_DECLS /* From C++ preparations */
/* Age of the universe (in Gyrs). */
double
gal_cosmology_age(double z, double H0, double o_lambda_0, double o_matter_0,
double o_radiation_0);
/* Proper distance to z (Mpc). */
double
gal_cosmology_proper_distance(double z, double H0, double o_lambda_0,
double o_matter_0, double o_radiation_0);
/* Comoving volume over 4pi stradian to z (Mpc^3). */
double
gal_cosmology_comoving_volume(double z, double H0, double o_lambda_0,
double o_matter_0, double o_radiation_0);
/* Critical density at redshift z in units of g/cm^3. */
double
gal_cosmology_critical_density(double z, double H0, double o_lambda_0,
double o_matter_0, double o_radiation_0);
/* Angular diameter distance to z (Mpc). */
double
gal_cosmology_angular_distance(double z, double H0, double o_lambda_0,
double o_matter_0, double o_radiation_0);
/* Luminosity distance to z (Mpc). */
double
gal_cosmology_luminosity_distance(double z, double H0, double o_lambda_0,
double o_matter_0, double o_radiation_0);
/* Distance modulus at z (no units). */
double
gal_cosmology_distance_modulus(double z, double H0, double o_lambda_0,
double o_matter_0, double o_radiation_0);
/* Convert apparent to absolute magnitude. */
double
gal_cosmology_to_absolute_mag(double z, double H0, double o_lambda_0,
double o_matter_0, double o_radiation_0);
__END_C_DECLS /* From C++ preparations */
#endif /* __GAL_COSMOLOGY_H__ */
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