SCHWINGERS DYNAMICAL CASIMIR EFFECT - BULK ENERGY CONTRIBUTION

Schwinger's Dynamical Casimir Effect is one of several candidate expla nations for sonoluminescence. Recently, several papers have claimed th at Schwinger's estimate of the Casimir energy involved is grossly inac curate, In this letter, we show that these calculations omit the cruci al volume term. When the missing term is correctly included one finds full agreement with Schwinger's result for the Dynamical Casimir Effec t. We have nothing new to say about sonoluminescence itself except to affirm that the Casimir effect is energetically adequate as a candidat e explanation.