Sonoluminescence and the macroscopic Pinch-Drive

When intense sound waves drive a small bubble in a liquid, the bubble can collapse and give off a flash of light. This is sonoluminescence. The standard explanation is heating: the collapse compresses the gas inside to thousands of kelvin or more, forming a hot, partly ionized plasma. David Flannigan and Kenneth Suslick measured that plasma's emission lines in 2005, though some details remain debated.

RSI sees the event as a large-scale, classical version of the Hydrodynamic Pinch-Drive, the process by which field pressure keeps each matter-knot running. The laboratory sound wave plays the role of the universal 10⁴³ Hz metronome, and RSI reads the extreme heating as the medium's crush acting on the bubble.

To be tested, RSI must reproduce the measured temperatures and spectra, including the plasma lines. Its proposal that the color of the flash depends on the stiffness of the liquid and the speed of the collapse becomes a test once it is given as a formula.