Mark Whittle says: “The Universe began not with a bang but with a low moan, building into a roar that gave way to a deafening hiss.”
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The intensity of the variations corresponds to about 110 decibels. Whittle has also used "the best available cosmological models" to map the way the vibrations evolved over time, showing how the chords of the big bang changed over the Universe’s first million years or so.
You need to be careful with this sort of stuff Bill S. There is no one version agreed on as the "big bang" so Mark Whittle assumes a sort of composite version and then extracts it out thru various models.
You have the cold big bang and sure you can have sound:
http://phys.org/news/2013-08-ultracold-big-successfully-simulates-evolution.htmlThe hot big bang is a little more difficult:
http://csep10.phys.utk.edu/astr162/lect/cosmology/hotbb.htmlNo agreed value but something like 300 000 - 700 000 years before you have atoms no sound until at least then.
It's one of the interesting revelations of last few years if you incorporate QM into the start of the universe as we now must there are many possible versions of the big bang and the trick is to sort which is correct.
