Parameters (hazma.parameters
)¶
hazma
’s collection of physical constants.
Masses¶
All masses are in MeV.
Conversion factors¶
- hazma.parameters.cm_to_inv_MeV = 50677307161.56396[source]¶
Convert \(\mathrm{cm}\) to \(\mathrm{MeV}^{-1}\)
- hazma.parameters.sv_inv_MeV_to_cm3_per_s = 1.1673299907789853e-11[source]¶
Convert \(\expval{\sigma v}\) from \(\mathrm{MeV}^{-2}\) to \(\mathrm{cm}^{3}/\mathrm{s}\)
- hazma.parameters.g_to_MeV = 5.609588603804452e+26[source]¶
Convert \(\mathrm{grams}\) to \(\mathrm{MeV}\)
Physical Constants¶
- hazma.parameters.alpha_em: float = 0.0072971395213076475[source]¶
Electromagnetic fine structure constant.
- hazma.parameters.temp_cmb_formation: float = 2.35e-07[source]¶
\(T_{\mathrm{CMB}}\) - CMB temperature at formation in MeV
- hazma.parameters.rho_crit: float = 0.0105375[source]¶
\(\rho_{\mathrm{crit}}\) - Critical energy density in units of \(h^2 \ [\mathrm{MeV} / \mathrm{cm}^3]\)
- hazma.parameters.sm_entropy_density_today: float = 2891.2[source]¶
\(s_{0}\) - Entropy density today [\(\mathrm{cm}^{-3}\)]
- hazma.parameters.omega_h2_cdm: float = 0.1198[source]¶
\(\Omega_{\mathrm{CMD}}h^2\) - Energy density fraction of dark matter times \(h^2\)
- hazma.parameters.dimensionless_hubble_constant: float = 0.6774[source]¶
\(h = H_{0}/(100 \mathrm{km/s/Mpc})\) - Hubble constant scale by 100 km/s/Mpc (Plank 2015)
- hazma.parameters.sin_theta_weak_sqrd: float = 0.2229[source]¶
\(\sin^2\theta_{W}\) - Square of the sine of the Weinberg angle
- hazma.parameters.sin_theta_weak: float = 0.47212286536451503[source]¶
\(\sin\theta_{W}\) - Sine of the Weinberg angle
- hazma.parameters.cos_theta_weak: float = 0.8815327560561774[source]¶
\(\cos\theta_{W}\) - Cosine of the Weinberg angle
- hazma.parameters.Vud: complex = (0.974352121697273+0j)[source]¶
\(V_{ud}\) - up-down CKM matrix element
- hazma.parameters.Vus: complex = (0.22499846626868697+0j)[source]¶
\(V_{us}\) - up-strange CKM matrix element
- hazma.parameters.Vts: complex = (-0.041088514331340434-0.000755182227369455j)[source]¶
\(V_{ts}\) - top-strange CKM matrix element
- hazma.parameters.Vtb: complex = (0.9991185074624703+0j)[source]¶
\(V_{tb}\) - top-bottom CKM matrix element
- hazma.parameters.Vtd: complex = (0.007916871032258304-0.0032703040945479727j)[source]¶
\(V_{td}\) - top-down CKM matrix element
- hazma.parameters.Qu: float = 0.6666666666666666[source]¶
\(Q_{u}/e\) - Up-type quark charge in units of electron charge.
- hazma.parameters.Qd: float = -0.3333333333333333[source]¶
\(Q_{d}/e\) - Down-type quark charge in units of electron charge.