Sonoluminescence: Bogolubov coefficients for the QED vacuum of a time-dependent dielectric bubble
Matt Visser, S. Liberati, F. Belgiorno, D. W. Sciama
Abstract
We extend Schwinger's ideas regarding sonoluminescence by explicitly calculating the Bogolubov coefficients relating the QED vacuum states associated with changes in a dielectric bubble. Sudden (non-adiabatic) changes in the refractive index lead to an efficient production of real photons with a broadband spectrum, and a high-frequency cutoff that arises from the asymptotic behaviour of the dielectric constant.
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