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Anomalous dynamic behaviour of a gas of quasiparticles in superfluid 3HeB

✍ Scribed by S.N. Fisher; A.M. Guénault; C.J. Kennedy; G.R. Pickett

Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
245 KB
Volume
165-166
Category
Article
ISSN
0921-4526

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✦ Synopsis

In 3He-B it is possible to probe the unusual dynamics arising from the non-Newtonian dispersion relation of the excitations. Since the dispersion relation is tied to the rest frame of the condensate, it is distorted by condensate motion. A container of superfluid with a velocity gradient has a range of excitation dispersion curves, depending on velocity and thus the density of states available to the excitations varies with position. We show that, in consequence the behaviour of a moving object in the excitation gas shows unusual and often counter-intuitive behaviour. At low enough temperature, the force on a moving object becomes independent of velocity.

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