"in space no one can hear you scream"
Have you overlooked the possibility that the early Universe may have been sufficiently dense for sound waves to propagate?
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.”
Whittle, it seems, has reconstructed the pattern of the sound waves that would have accompanied the birth of the Universe. He has done this by studying the high resolution mapping of the CMBR, translating the observed frequency spectrum directly to sound which yields tones far too low for ears to hear – some 50 octaves below middle A – but transpose the score up all those octaves and you can listen to it.
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.
