The MAXIMA, BOOMERANG, and DASI collaborations, which measure minute variations in the CMB, recently reported new results at the American Physical Society meeting in Washington, D.C. All three agree remarkably about what the “harmonic proportions” of the cosmos imply: not only is the universe flat, but its structure is definitely due to inflation, not to topological defects in the early universe.
The results were presented as plots of slight temperature variations in the CMB that graph sound waves in the dense early universe. These high-resolution “power spectra” show not only a strong primary resonance but are consistent with two additional harmonics, or peaks.
The peaks indicate harmonics in the sound waves that filled the early, dense universe. Until some 300,000 years after the Big Bang, the universe was so hot that matter and radiation were entangled in a kind of soup in which sound waves (pressure waves) could vibrate. The CMB is a relic of the moment when the universe had cooled enough so that photons could "decouple" from electrons, protons, and neutrons; then atoms formed and light went on its way.
Earlier I had mentioned one of the things that we could not know were the details of the universe beyond a certain distance, because the light from those parts of the universe has not reached us yet. In her response she mentioned the Hubbel horizon.
The horizon I was interested in is the "cosmic light horizon".
Sorry for the confusion.
Hank