Constant physical_constants::NEWTONIAN_CONSTANT_OF_GRAVITATION_OVER_H_BAR_C

pub const NEWTONIAN_CONSTANT_OF_GRAVITATION_OVER_H_BAR_C: f64 = 6.70883e-39f64;

Newtonian constant of gravitation over h-bar c (unit: (GeV/c²)^-2)