The Dynamics of Quantum Fluids
Abstract
We review experimental and theoretical progress in the physical description of the dynamics of the quantum fluids 4 and 3. Historically, the elementary excitations in these systems have been identified as phonons and rotons and, in 3, collective zero sound and spin-fluctuations. Both recent high-precision measurements and theoretical methods have shown that the dynamics of these systems is actually very rich as will be discussed in detail in the body of this contribution.
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