pygnuastro.cosmology.critical_density

pygnuastro.cosmology.critical_density()

Returns the critical density at redshift z in units of g/cm3.

Parameters:

• z (float) – Redshift

• H0 (float/None) – Hubble constant in units of km/sec/Mpc

• olambda (float/None) – Cosmological Constant

• omatter (float/None) – Matter Density

• oradiation (float/None) – Radiation Density

Returns:

The age of the universe at redshit z in units of Giga years.

Return type:

float