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

H 0 = 1 / t [ s 1 ]

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

Ω r = 10 5

Ω Λ = 0.96893

The cosmological constant represents radiation energy

Curvature energy density

Ωk

+0.001 ± 0.002

0.00062

Curvature energy is of unknown origin

Cosmic neutrino mass

mν [eV]

Σ m ν 0.12

≤48 × 103 [eV]

The cosmic neutrino is estimated with the muonic neutrino with β SN1987A