Abstract
The spin hydrodynamic equations for superfluid3He-A for the case of external, time-dependent fields are considered. The terms in equations containing these fields are found on the basis of a microscopic approach. Considering the linear response of the system to the switching on of external fields, formulas are found for suitable Green's functions constructed from operators entering the spin hydrodynamics. The Green's function connected with the order parameter operator has a “1/q 2” singularity. Suitable connections between Green's functions lead to relations among kinetic coefficients (Onsager relations). A more detailed consideration of the spin-orbit coupling when the spin waves are not true Goldstone modes removes the mentioned singularity and the Onsager relations remain valid.
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Galasiewicz, Z.M. Green's functions for superfluid3He-A in the case of spin hydrodynamics: Influence of the spin-orbit coupling. J Low Temp Phys 72, 153–164 (1988). https://doi.org/10.1007/BF00681730
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DOI: https://doi.org/10.1007/BF00681730