2020-08-21 17:03:33 +02:00
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// This file is part of monofonIC (MUSIC2)
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// A software package to generate ICs for cosmological simulations
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// Copyright (C) 2020 by Oliver Hahn
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//
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// monofonIC is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// monofonIC is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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2020-03-29 14:42:55 +02:00
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#pragma once
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2020-08-21 17:03:33 +02:00
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//------------------------------------------------------------------------------------
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2020-03-29 14:42:55 +02:00
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// physical constants for convenience, all values have been taken from
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// the 2018 edition of the Particle Data Group Booklet,
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// http://pdg.lbl.gov/2019/mobile/reviews/pdf/rpp2018-rev-phys-constants-m.pdf
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namespace phys_const
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{
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// helper value of pi so that we don't need to include any other header just for this
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static constexpr double pi_ = 3.141592653589793115997963468544185161590576171875;
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//--- unit conversions ---------------------------------------------------
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// 1 Mpc in m
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static constexpr double Mpc_SI = 3.0857e22;
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// 1 Gyr in s
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static constexpr double Gyr_SI = 3.1536e16;
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// 1 eV in J
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static constexpr double eV_SI = 1.602176487e-19;
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// 1 erg in J
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static constexpr double erg_SI = 1e-7;
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//--- physical constants ------------------------------------------------
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// speed of light c in m/s
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static constexpr double c_SI = 2.99792458e8;
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// gravitational constant G in m^3/s^2/kg
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static constexpr double G_SI = 6.6740800e-11;
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// Boltzmann constant k_B in kg m^2/s^2/K
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static constexpr double kB_SI = 1.38064852e-23;
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// reduced Planck's quantum \hbar in kg m^2/s
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static constexpr double hbar_SI = 1.054571800e-34;
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// Stefan-Boltzmann constant sigma in J/m^2/s/K^-4
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static constexpr double sigma_SI = (pi_ * pi_) * (kB_SI * kB_SI * kB_SI * kB_SI) / 60. / (hbar_SI * hbar_SI * hbar_SI) / (c_SI * c_SI);
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// electron mass in kg
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static constexpr double me_SI = 9.10938356e-31;
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// proton mass in kg
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static constexpr double mp_SI = 1.672621898e-27;
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// unified atomic mass unit (u) in kg
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static constexpr double u_SI = 1.660539040e-27;
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// critical density of the Universe in h^2 kg/m^3
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static constexpr double rhocrit_h2_SI = 3 * 1e10 / (8 * pi_ * G_SI) / Mpc_SI / Mpc_SI;
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} // namespace phys_const
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