The density-density correlation function of He II bounded by solid walls is calculated in the hydrodynamic region. The migration of its poles as a function of the resistance parameter is investigated, and it is found that the fourth-sound pole can only be related to the first-sound pole far enough (ϱs0/ϱ0>1/9) from the critical temperature. Otherwise, it arises from a mixture of the first- and second-sound poles. The contributions of poles to the sum rules are also discussed.
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Rácz, Z. On the nature of the fourth sound. J Low Temp Phys 11, 509–518 (1973). https://doi.org/10.1007/BF00656567
- Correlation Function
- Critical Temperature
- Magnetic Material
- Solid Wall