Homogeneity and
Isotropy
•Can measure isotropy and
homogeneity on different scales. ‘Nearby’ using galaxies,
at early epochs using the cosmic microwave background radiation
(CMBR).
•Some more on this later, but
note that temperature inhomogeneity corresponds to a
density inhomogeniety via Einstein effect (through gravitational
frequency shift, verified by Pounds and REBKA):
