Наукова електронна бібліотека
періодичних видань НАН України
періодичних видань НАН України
Evolution of a pulse of noninteracting quasiparticles with dispersion and initial angular width
Репозиторій DSpace/Manakin
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Evolution of a pulse of noninteracting quasiparticles with dispersion and initial angular width
Тема:
Квантовые жидкости и квантовые кpисталлы
Інший ID:
PACS: 67.40.Fd
Посилання:
Evolution of a pulse of noninteracting quasiparticles with dispersion and initial angular width / I.N. Adamenko, K.E. Nemchenko, V.A. Slipko, and A.F.G. Wyatt // Физика низких температур. — 2004. — Т. 30, № 6. — С. 579-589. — Бібліогр.: 20 назв. — англ.
Підтримка:
We express our gratitude to EPSRC of the UK
(grant GR/S24855 and GR/N20225), and to GFFI
of Ukraine (grant N02.07/000372) for support for
this work.
Дата:
2004
Переглядів:
819
Завантажень:
562
Анотація:
The evolution of a pulse of noninteracting quasiparticles, caused by their different velocities
and angular distribution of momenta, is studied theoretically. Equations are found that describe
the shape of the pulse surface at any time. The time of the beginning, end and duration of the density
of the quasiparticle energy flux is determined at a general spatial point. The quasiparticle energy
density is considered at all times and positions, and it is shown that the region of high energy
density, in the middle of the pulse, is equal to the initial energy density under certain conditions.
These theoretical results are discussed in relation to experimental data on the evolution of a pulse
of noninteracting phonons in superfluid helium.
