Melting and growth of solid by ultrasound

Underbarrier nucleation kinetics in a metastable quantum liquid near the liquid-gas spinodal line

“…The appearance of | ω n | in (7) agrees with the general rule of analytic continuation ω → ı | ω n | for the Fourier transforms of retarded correlators in the course of transformation from the physical real time to imaginary time. Note that the case of zero relaxation time τ = 0 corresponds to the action considered in [12] within the linear approximation δρ/ρ = −∇ • u in (5). In [12] the nucleation dynamics was assumed to be completely reversible and thus any possible effect of relaxation and energy dissipation upon the underbarrier nucleation was ignored.…”

“…The range of the metastable systems in which the macroscopic quantum nucleation is currently investigated is rather wide. These are from the helium systems involving, in particular, solidification from the overpressurized liquid phase [3], various types of sound-induced nucleation [4,5], phase separation of supersaturated 3 He-4 He superfluid mixtures [6], and cavitation of bubbles at negative pressures [7,8] to the collapse of the Bose-Einstein condensate in a Bose gas with attraction [9] and the formation of a quark matter in the core of neutron stars [10].…”