We investigate the relaxation of boundless and anisotropic quasiparticle systems, in liquid 4He, with given initial values of momentum and energy densities. The evolution is governed by the dispersion curve which determines the interactions between quasi-particles. The first stage of the relaxation is the rapid creation of a quasistationary low-energy phonon system. This system transforms to another quasistationary system which contains high-energy phonons as well as low energy-phonons. Finally the system evolves to a stationary system of phonons and rotons. The temperature T and the drift velocity u are found for the closed quasi-particle system during its relaxation. This allows us to study the quasi-particle energy and the angular distribution of momentum, and the thermodynamic functions of the quasi-particles system, at each of stage of its evolution.
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Adamenko, I.N., Nemchenko, K.E., Slipko, V.A. et al. Relaxation of Anisotropic Systems of Quasi-particles in Superfluid Helium. J Low Temp Phys 145, 387–407 (2006). https://doi.org/10.1007/s10909-006-9250-4
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DOI: https://doi.org/10.1007/s10909-006-9250-4