>Q: How can you represent it as a sound? Sound is supposed to be a wave that travels through air, and there was no air in the early stages of the Big Bang?
>A: The Big Bang Sound in the simulation is derived from the sound propagating as compression waves through the plasma/hydrogen medium of the early universe some 100 to 700 thousand years after the initial Big Bang. The density of this medium was changing as the universe expanded, but should have been considerably more dense than air on our little planet. One does NOT need air to have sound, only some medium in which compression/rarefaction waves can propagate. The sound waves were very low in frequency and had wavelengths comparable to some fraction of the size of the universe. For the convenience of humans, who could not hear such low frequencies, I have increased them to the audio range of the human ear.
Or... One could simply say it's a rendering of J.R.R. Tolkien's Ainulindalë. ;)
