Summary
The viscoelastic model for the propagation of sound in liquid3He is generalized by including distorsions of the Fermi surface with multipolarityl=3. The predictions of the theory are compared with the solutions of Landau's equations as well as with experimental data for the attenuation and velocity of sound. Connections with other approaches based on the use of sum rules and of extended thermodynamics are also discussed.
Riassunto
Il modello viscoelastico per la propagazione del suono in3He liquido è stato generalizzato mediante l'inclusione di deformazioni della sfera di Fermi con multipolaritàl=3. Le previsioni della teoria sono state confrontate con le soluzioni dell'equazione di Landau così come con dati sperimentali di attenuazione e velocità del suono. Sono state inoltre discusse connessioni con altri approcci basati sull'uso delle regole di somme e della termodinamica del non equilibrio.
Резюме
Обобщается упруговязкая модель распространения звука в жидком3He, включая искажения прверхности Ферми с мультипольностьюl=3. Предсказания теории сравниваются с решениями уравнений Ландау, а также с зкспериментальными данными для затухания и скорости звука. Обсуждается взаимосвязь с другими подходами, основанными на использовании правии сумм и неравновесной термодинамике.
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Dalfovo, F., Stringari, S. Macroscopic models for sound propagation in normal liquid3He. Il Nuovo Cimento D 6, 445–467 (1985). https://doi.org/10.1007/BF02451902
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DOI: https://doi.org/10.1007/BF02451902