Sonoluminescence: Coupling to an applied magnetic field

Abstract

We investigate several means of coupling between a sonoluminescing bubble and an applied magnetic field. Recent experiments show a strong quadratic dependence between the forcing pressures required for stable sonoluminescence and magnetic field amplitude. However, all coupling mechanisms calculated here for comparable magnetic fields involve energies no more than one percent the mechanical energy of bubble collapse. We conclude that the applied field must influence the system though its effect on some parameter which the bubble motion depends upon very sensitively. A few such mechanisms are suggested. : 78.60.Mq, 47.65.+a, 67.55.Fa PACS

Sonoluminescence as a QED vacuum effect. I. The physical scenario

“…At this stage of development, we are not concerned with the detailed dynamics of the bubble surface, and confine attention to the bulk effects, deferring consideration of finite-volume effects to the companion paper [38]. 7 It should be noted that similar unphysical features also affect the "shock wave"-based models [1]: Indeed, the Mach number of the shock formally diverges as the shock implodes towards the origin (cf. page 126 of [1]).…”

“…This corresponds to the region near the origin, and we focus on this region in figure (7). Second, if n in ≫ n out then we can approximate…”

Photon Productions in a Gravitational Collapsing

“…in (73) and T t t l=0 out (79) for → 0 up to O(2/ ), we find that the term m 2 is canceled in the difference T t t l=0…”

“…Sonoluminescence is the phenomenon of the intense flashes of light emission by the pulsations of a gas bubble driven by sound-wave in fluid [66][67][68][69][70][71][72][73][74]. Such experiments deal with the pulsations of bubbles of air in water, driven by a sound wave of frequency of 20-30 KHz.…”

“…There are about 10 6 photons emitted per flash, and the time-averaged total power emitted is between 30 and 100 mW. The photons appear to be emitted a very tiny spatial-temporal region: Estimated flash widths vary from less than 35 ps to more than 380 ps depending on the gas in the bubble [66][67][68][69][70][71][72][73][74].…”