Geodesic
Collective excitations in the superfluid $A$~and $B$~phases of~$\operatorname{He}^3$ in an electric field
Teoretičeskaâ i matematičeskaâ fizika, Tome 57 (1983) no. 2, pp. 249-256

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The influence of an electric field on Bose excitations in the superfluid $A$ and $B$ phases of a system of $\operatorname{He}^3$ type is investigated by the functional integration method. To find the Bose spectrum of the system in an electric field, a functional of the hydrodynamic (effective) action is constructed. In the first approximation, the electric field influences only the acoustic modes in both the $A$ and the $B$ phase. In both phases, the acoustic spectrum has the same form and becomes anisotropic in the electric field. The velocity of sound is maximal in the direction of the electric field. 
@article{TMF_1983_57_2_a7,
     author = {P. N. Brusov and V. N. Popov},
     title = {Collective excitations in the superfluid $A$~and $B$~phases of~$\operatorname{He}^3$ in an electric field},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {249--256},
     publisher = {mathdoc},
     volume = {57},
     number = {2},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1983_57_2_a7/}
}
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P. N. Brusov; V. N. Popov. Collective excitations in the superfluid $A$~and $B$~phases of~$\operatorname{He}^3$ in an electric field. Teoretičeskaâ i matematičeskaâ fizika, Tome 57 (1983) no. 2, pp. 249-256. http://geodesic.mathdoc.fr/item/TMF_1983_57_2_a7/