Vortex-phonon interaction

Vortex-phonon interaction
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涡旋-声子相互作用

DOI:
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发表时间:
2005
期刊:
影响因子:
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通讯作者:
B. Svistunov
B. Svistunov
中科院分区:
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文献类型:
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作者:
E. Kozik;B. Svistunov

文献摘要

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开尔文波——量子化旋涡线上的螺旋波——是超流体中旋涡的正常模式。在零温度下,涡旋动力学的唯一耗散通道是声子发射。从流体动力作用出发,导出了涡声子相互作用的哈密顿量,从而将开尔文波与声音的相互作用问题简化为非弹性初等激发散射问题。在此基础上,我们计算了零温度下超流体湍流声辐射率,并估计了湍流谱的短波截止值。
Kelvin waves--helical waves on quantized vortex lines--are the normal modes of vortices in a superfluid. At zero temperature, the only dissipative channel of vortex dynamics is phonon emission. Starting with the hydrodynamic action, we derive the Hamiltonian of vortex-phonon interaction, thereby reducing the problem of the interaction of Kelvin waves with sound to inelastic elementary excitation scattering. On the basis of this formalism, we calculate the rate of sound radiation by superfluid turbulence at zero temperature and estimate the value of short-wavelength cutoff of the turbulence spectrum.