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Table 1.
Parameters of the cosmological model used in the present calculations (Planck Collaboration XIII 2016).
| Description | Symbol | Value |
|---|---|---|
| Total density | Ωtot | 1 |
| Dark energy density | ΩΛ | 0.6911 |
| Baryon density | Ωb | 0.0486 |
| Dark matter density | Ωc | 0.2589 |
| Nonrelativistic matter density | Ωm | 0.3089 |
| Relativistic matter density | Ωrel | 9.07 × 10−5 |
| Hubble constant | H0 | 67.74 km s−1 Mpc−1 |
| Present temperature of CMB | T0 | 2.725 K |
| Hydrogen mass fraction | X | 0.76 |
| Helium mass fraction | Y | 0.24 |
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