Description | Symbol | ΛCDM | ΑΛΩ | Comments |
Age of the universe (cosmic) | tΩ [Gy] | 13.799 (obs.) 46 | 13.799 (obs.) 76.1 | The MW is at cosmic time 13.8 [Gy] |
Total density parameter | Ωtot | 1 | 1 |
|
Hubble constant | H0 [km·s−1·Mpc−1] | 67.4 ± 0.5 | 70.9 |
|
Baryonic density | Ωb | 0.0486 | 0.03045 | Less baryonic matter |
Dark matter density | Ωcdm | 0.2664 | 0 | Dark matter is not a parameter of the model |
Matter density | Ωm | 0.315 | 0.03045 | Baryonic matter only |
Dark energy density | ΩΛ | 0.685 | 0 | Mass and/or photon energy only, except for curvature k |
Radiation energy density | Ωr or ΩΛ |
|
| The cosmological constant represents radiation energy |
Curvature energy density | Ωk | +0.001 ± 0.002 | | Curvature energy is of unknown origin |
Cosmic neutrino mass | mν [eV] |
| ≤48 × 103 [eV] | The cosmic neutrino is estimated with the muonic neutrino with β SN1987A |