Sonoluminescence as a QED vacuum effect. II: Finite Volume Effects

Details Sonoluminescence as a QED vacuum effect. II: Finite Volume Effects Sonoluminescence as a QED vacuum effect. II: Finite Volume Effects

1999-05-10

arxiv.org/abs/quant-ph/9905034v1

Phys.Rev. D61 (2000) 085024

Physics

Quantum Physics

23 pages, LaTeX 209, ReV-TeX 3.2, five figures

Scientific paper

10.1103/PhysRevD.61.085024

In a companion paper [quant-ph/9904013] we have investigated several variations of Schwinger's proposed mechanism for sonoluminescence. We demonstrated that any realistic version of Schwinger's mechanism must depend on extremely rapid (femtosecond) changes in refractive index, and discussed ways in which this might be physically plausible. To keep that discussion tractable, the technical computations in that paper were limited to the case of a homogeneous dielectric medium. In this paper we investigate the additional complications introduced by finite-volume effects. The basic physical scenario remains the same, but we now deal with finite spherical bubbles, and so must decompose the electromagnetic field into Spherical Harmonics and Bessel functions. We demonstrate how to set up the formalism for calculating Bogolubov coefficients in the sudden approximation, and show that we qualitatively retain the results previously obtained using the homogeneous-dielectric (infinite volume) approximation.

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