ablastr::constant::SI Namespace Reference

Variables
static constexpr auto	c = 299'792'458._rt
	vacuum speed of light [m/s]
static constexpr auto	ep0 = 8.8541878188e-12_rt
	vacuum permittivity: dielectric permittivity of vacuum [F/m]
static constexpr auto	mu0 = 1.2566370612685e-06_rt
static constexpr auto	q_e = 1.602176634e-19_rt
	elementary charge [C]
static constexpr auto	m_e = 9.1093837139e-31_rt
	electron mass [kg]
static constexpr auto	m_p = 1.67262192595e-27_rt
	proton mass [kg]
static constexpr auto	m_u = 1.66053906892e-27_rt
	dalton: unified atomic mass unit [kg]
static constexpr auto	hbar = 1.0545718176461565e-34_rt
	reduced Planck Constant = h / tau [J*s]
static constexpr auto	alpha = 0.0072973525643330135_rt
static constexpr auto	r_e = 2.8179403205e-15_rt
	classical electron radius = 1./(4*pi*ep0) * q_e*q_e/(m_e*c*c) [m]
static constexpr double	xi = 1.3050122383827227e-52
	xi: nonlinearity parameter of Heisenberg-Euler effective theory = (2.*alpha*alpha*ep0*ep0*hbar*hbar*hbar)/(45.*m_e*m_e*m_e*m_e*c*c*c*c*c)
static constexpr auto	xi_c2 = 1.1728865075613984e-35_rt
	xi times c2 = xi*c*c. This should be usable for single precision instead of xi; very close to smallest float32 number possible (1.2e-38)
static constexpr auto	kb = 1.380649e-23_rt
	Boltzmann constant (exact) [J/K].
static constexpr auto	eV = q_e
	1 eV in [J]
static constexpr auto	MeV = q_e * 1e6_rt
	1 MeV in [J]
static constexpr auto	eV_invc = eV / c
	1 eV/c in [kg*m/s]
static constexpr auto	MeV_invc = MeV / c
	1 MeV/c in [kg*m/s]
static constexpr auto	eV_invc2 = eV / (c * c)
	1 eV/c^2 in [kg]
static constexpr auto	MeV_invc2 = MeV / (c * c)
	1 MeV/c^2 in [kg]

Detailed Description

Physical constants

Values are the 2022 CODATA recommended values https://physics.nist.gov/cuu/Constants/index.html

New additions here should also be considered for addition to warpx_constants in WarpXUtil.cpp's makeParser, so that they're available in parsing and evaluation of PICMI expressions, as well as the corresponding Python definitions

Variable Documentation

alpha

auto ablastr::constant::SI::alpha = 0.0072973525643330135_rt

staticconstexpr

fine-structure constant = mu0/(4*pi)*q_e*q_e*c/hbar [dimensionless] The value is calculated from the expression. This differs slightly from the CODATA2022 value 0.0072973525643.

c

auto ablastr::constant::SI::c = 299'792'458._rt

staticconstexpr

vacuum speed of light [m/s]

ep0

auto ablastr::constant::SI::ep0 = 8.8541878188e-12_rt

staticconstexpr

vacuum permittivity: dielectric permittivity of vacuum [F/m]

eV

auto ablastr::constant::SI::eV = q_e

staticconstexpr

1 eV in [J]

eV_invc

auto ablastr::constant::SI::eV_invc = eV / c

staticconstexpr

1 eV/c in [kg*m/s]

eV_invc2

auto ablastr::constant::SI::eV_invc2 = eV / (c * c)

staticconstexpr

1 eV/c^2 in [kg]

hbar

auto ablastr::constant::SI::hbar = 1.0545718176461565e-34_rt

staticconstexpr

reduced Planck Constant = h / tau [J*s]

kb

auto ablastr::constant::SI::kb = 1.380649e-23_rt

staticconstexpr

Boltzmann constant (exact) [J/K].

m_e

auto ablastr::constant::SI::m_e = 9.1093837139e-31_rt

staticconstexpr

electron mass [kg]

m_p

auto ablastr::constant::SI::m_p = 1.67262192595e-27_rt

staticconstexpr

proton mass [kg]

m_u

auto ablastr::constant::SI::m_u = 1.66053906892e-27_rt

staticconstexpr

dalton: unified atomic mass unit [kg]

MeV

auto ablastr::constant::SI::MeV = q_e * 1e6_rt

staticconstexpr

1 MeV in [J]

MeV_invc

auto ablastr::constant::SI::MeV_invc = MeV / c

staticconstexpr

1 MeV/c in [kg*m/s]

MeV_invc2

auto ablastr::constant::SI::MeV_invc2 = MeV / (c * c)

staticconstexpr

1 MeV/c^2 in [kg]

mu0

auto ablastr::constant::SI::mu0 = 1.2566370612685e-06_rt

staticconstexpr

vacuum permeability: magnetic permeability of vacuum = 4.0e-7 * pi [H/m] Note that this is adjusted from the CODATA2022 value, 1.25663706127e-06 So that the relation between mu0, ep0, and c is exact.

q_e

auto ablastr::constant::SI::q_e = 1.602176634e-19_rt

staticconstexpr

elementary charge [C]

r_e

auto ablastr::constant::SI::r_e = 2.8179403205e-15_rt

staticconstexpr

classical electron radius = 1./(4*pi*ep0) * q_e*q_e/(m_e*c*c) [m]

xi

double ablastr::constant::SI::xi = 1.3050122383827227e-52

staticconstexpr

xi: nonlinearity parameter of Heisenberg-Euler effective theory = (2.*alpha*alpha*ep0*ep0*hbar*hbar*hbar)/(45.*m_e*m_e*m_e*m_e*c*c*c*c*c)

xi_c2

auto ablastr::constant::SI::xi_c2 = 1.1728865075613984e-35_rt

staticconstexpr

xi times c2 = xi*c*c. This should be usable for single precision instead of xi; very close to smallest float32 number possible (1.2e-38)