Sonoluminescence and the QED vacuum
Abstract
In this talk I shall describe an extension of the quantumvacuum approach to sonoluminescence proposed several years ago by J.Schwinger. We shall first consider a model calculation based on Bogolubov coefficients relating the QED vacuum in the presence of an expanded bubble to that in the presence of a collapsed bubble. In this way we shall derive an estimate for the spectrum and total energy emitted. This latter will be shown to be proportional to the volume of space over which the refractive index changes, as Schwinger predicted. After this preliminary check we shall deal with the physical constraints that any viable dynamical model for SL has to satisfy in order to fit the experimental data. We shall emphasize the importance of the timescale of the change in refractive index. This discussion will led us to propose a somewhat different version of dynamical Casimir effect in which the change in volume of the bubble is no longer the only source for the change in the refractive index.
 Publication:

arXiv eprints
 Pub Date:
 April 1999
 arXiv:
 arXiv:quantph/9904008
 Bibcode:
 1999quant.ph..4008L
 Keywords:

 Quantum Physics;
 High Energy Physics  Phenomenology;
 High Energy Physics  Theory
 EPrint:
 15 pages, 1 figure, uses sprocl.sty. Talk at the 4th Workshop on Quantum Field Theory Under the Influence of External Conditions, Leipzig, 1418 September, 1998