Useful Cosmological Quantities
(reference: WMAP)
Main parameters
- Total density: Omega_tot = Omega_l + Omega_m = 1.02
- Dark energy density: Omega_l = 0.73
- Hubble constant: Ho= 71 km*s-1*Mpc-1 --> h = Ho/(100 km*s-1*Mpc-1)= 0.71
- Critical density: 1.88h2x10-29 g*cm-3 --> 2.7h2x1011 Msun/Mpc3 --> 1.1h2x10-5 cm-3
- Critical density (h=0.71): 9.48e-30 g*cm-3 --> 1.36e+11 Msun/Mpc3 --> 5.55e-06 cm-3
Matter
- Matter density parameter: Omega_m*h2 = 0.135 --> Omega_m(h=0.71) = 0.27
- Matter density: nm = 2.56e-30 g*cm-3 --> 3.67e+10 Msun/Mpc3 --> 1.5e-6 cm-3
Baryons
- Baryon density parameter: Omega_b*h2 = 0.0224 --> Omega_b(h=0.71) = 0.044
- Baryon density: nb = 4.17e-31 g*cm-3 --> 5.99e+9 Msun/Mpc3 --> 2.44e-7 cm-3
Other
- Baryon-to-matter ratio: Omega_b*Omega_m-1 = 0.17