## speed of light
speed_of_light = 299792458.0 ## m/s
## solar mass
solar_mass = 1.98847e+30 #Kg
## Newton's constant
G = 6.6743e-11 ## m^3/kg/s from <https://physics.nist.gov/cuu/Constants/index.html> 
## Megaparsec
Mpc = 3.0857e22 ## m

## cosmological parameteres from
## Planck 2018 results VI, Tab.1
## https://arxiv.org/abs/1807.06209
#omega_matter = 0.31
#omega_lamda = 1.-omega_matter
#H0 = 67.37

## reasonable approximate cosmological model
omega_matter = 0.3
omega_lamda = 1.-omega_matter
H0 = 70.


