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Quasiparticles, created in dissipative nonlinear wave systems by external excitation, can form a Bose-Einstein condensate. The authors describe here the physical phenomena and conditions leading to condensation in various regimes of external excitation from weak and stationary to ultrastrong pumping. The authors have developed a stationary nonlinear theory of kinetic instability for the latter, supported by the experimental data for magnons, parametrically pumped in room-temperature films of yttrium iron garnet.
L’vov et al. (Wed,) studied this question.
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