32,477 research outputs found
Effects of thermal conduction in sonoluminescence
We show by numerical hydrodynamic calculations that there are two important effects of thermal conduction in sonoluminescence: (i) the bubble remains close to being isothermal during the expansion phase; and (ii) a cold, dense layer of air is formed at the bubble wall during the contraction phase. These conclusions are not sensitive to the particular equation of state used, although details of the dynamical evolution of the bubble are
Evidence for the Role of Instantons in Hadron Structure from Lattice QCD
Cooling is used as a filter on a set of gluon fields sampling the Wilson
action to selectively remove essentially all fluctuations of the gluon field
except for the instantons. The close agreement between quenched lattice QCD
results with cooled and uncooled configurations for vacuum correlation
functions of hadronic currents and for density-density correlation functions in
hadronic bound states provides strong evidence for the dominant role of
instantons in determining light hadron structure and quark propagation in the
QCD vacuum.Comment: 26 pages in REVTeX, plus 10 figures, uuencoded. Submitted to Physical
Review D. MIT-CTP-226
Test of the Skyrme Effective Field Theory Using Quenched Lattice QCD
The Skyrme effective field theory is tested by evaluating nucleon ground
state matrix elements of the correlation functions for two flavor density
operators and two pseudoscalar density operators in the Skyrme model and
comparing them with results in quenched lattice QCD. The possiblility of using
quenched lattice QCD to study higher-order terms in effective field theory is
also discussed.Comment: 20 pages in TeX, 6 figures added using "figures", MIT-CTP-200
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