Sonoluminescence: Bogolubov coefficients for the QED vacuum of a collapsing bubble

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Abstract
In this Letter we extend Schwinger's model for sonoluminescence by explicitly calculating the Bogolubov coefficients relating the QED vacuum states associated with the collapse of a dielectric bubble. We explicitly show that sudden (non-adiabatic) collapse leads to the production of real photons with a spectrum proportional to phase space volume, and a high-frequency cutoff that arises from the asymptotic behaviour of the dielectric constant. Some controversial issues are cleared up and we argue that the Casimir energy model remains a viable candidate for explaining sonoluminescence.

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