Sonoluminescence as Recomposition Emission: A Cymalogical Account of the Third Coupling Regime

Single-bubble sonoluminescence has been studied for three decades and its emission mechanism remains contested. A gas bubble trapped in a standing acoustic field collapses once per cycle and emits a picosecond flash, timed to a few parts in 10^11. Three features have resisted thermal explanation: the spectrum carries no lines, even when the surrounding liquid would supply obvious ones; the flash duration is the same in the ultraviolet as in the infrared; and stable emission requires a noble gas, to the point that an air bubble chemically strips itself down to pure argon before it will shine. This paper accounts for all three within the cymalogical framework (DOI:10.5281/zenodo.21828306), without introducing any new mechanism. The framework admits exactly three coupling regimes. Two have been assigned to engineered devices; the third — phase opposition between two configurations of the same sheet, which recomposes them and returns the released structure as the photon itself — had no phenomenon attached to it. Sonoluminescence is proposed as that phenomenon. ------- Keywords: Cymalogy • Sonoluminescence • Single-Bubble Sonoluminescence • Cavitation • Acoustic Cavitation • Noble Gas • Argon Rectification • Photon Emission • Recomposition Emission • Causal Geometry • Picosecond Flash • Bubble Collapse • Theoretical Physics • Open Science •