This recording of the sound of the Big Bang was created by physicist John G. Cramer from the University of Washington. His Mathematica program (or notebook) combines the WMAP measured frequencies, appropriately scaled for the human ear, assuming that all the sinusoids start at a maximum at t=0 (the start of the Big Bang), and frequency-shifts them downward as time 2/3 as the universe expands and becomes more of a "bass instrument". The simulation lasts 100 seconds representing the first 760 thousand years of evolution of the universe and varies the sound intensity to match the cosmic microwave which, according to WMAP, peaked at 379 thousand years and dropped to 60% intensity in 110 thousand years before and after the peak time. The sound frequencies used in the simulation must be boosted upward by a huge factor (about 10 to the 26 power) to match the response of the human ear, because the actual Big Bang frequencies, which had wavelengths on the order of a fraction of the size of the universe, were far too low to be heard by humans (even had any been around).
Source: [ Ссылка ]
Credit: (c) John G. Cramer - 2013

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