•Radiation-Dominated
Universes
–So,
does the BB radiation have the right temperature dependence as a
function of z? That
is, T = T0(1+z)?
–Yes! Keck spectra of fine structure in C I absorption
lines associated with damped Ly alpha absorbers. Two cases, z=1.766 shows T
= 7.4 K, and z=1.973 shows T=7.9 K.
–