Excitations in Liquid Helium at Negative Pressures
In this article we will discuss the behavior of liquid helium at negative pressures, with particular emphasis on the dispersion curve for phonons and rotons. We will show that even though the amount of experimental work so far performed on helium in a state of tension is quite small, it is possible to deduce the main features of the variation of the dispersion curve with pressure in surprising detail. Furthermore, the results of the analysis provide a new perspective on the behavior of helium for positive pressure.
KeywordsBulk Modulus Negative Pressure Dispersion Curve Sound Velocity Liquid Helium
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