Table 1
Scales relevant for the CMB temperature anisotropy spectrum.
| T | H(T) × (T0/T) |
|
|
|
| Teq ~ mχηχ |
|
| Tpγ ~ mpηb |
|
| Tdec = α2mefdec |
|
|
|
|
|
|
D
-1
|
|
Notes. Column 1: the temperature scale. Column 2: the associated distance scale, 1 /H(T), redshifted to the present epoch. The table shows the simplified dependencies on cosmological and fundamental parameters. (Numerical factors and factors of ħ and c are omitted.) The redshifting in Col. 2 leaves only dimensionless combinations of fundamental constants. The subscript zero refers to present values and its absence refers to pre-recombination values. CDM domination is assumed (mχηχ ≫ mpηb). The factor fdec ~ 0.01 is a logarithmic function of cosmological and fundamental parameters, Eq. (16). The fourth line shows the co-moving distance to the last-scattering surface in the flat-ΛCDM model.
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