By solving the equations of ordinary and two-liquid hydrodynamics, we study the oscillatory modes in isotropic nonpolar dielectrics He I and He II in the presence of an alternating electric field $\textbf{E}=E_{0}\textbf{i}_{z}\sin{(k_{0}z-\omega_{0} t)}$. The electric field and oscillations of the density become "coupled," since the density gradient causes a spontaneous polarization $\textbf{P}_{s}$, and the electric force contains the term $(\textbf{P}_{s}\nabla)\textbf{E}$... (read more)

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