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A microscopic calculation of the force on a wire moving through superfluid3He-B in the ballistic regime

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Abstract

When a macroscopic object moves through superfluid3He, it experiences a force arising from the effect of quasiparticle scattering. We develop a three-dimensional microscopic model to calculate the force on a smooth cylinder moving at constant velocityv as a model of a vibrating wire. At large (subcritical) wire velocity, the force tends to an asymptotic value as 1/v 2, rather than exponentially as in a one-dimensional calculation. At lowv the force is linear inv. We briefly discuss the agreement of our calculations with experimental measurements on a vibrating wire below 0.2T c, where the quasiparticle trajectories are ballistic.

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References

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Fisher, S.N., Pickett, G.R. & Watts-Tobin, R.J. A microscopic calculation of the force on a wire moving through superfluid3He-B in the ballistic regime. J Low Temp Phys 83, 225–235 (1991). https://doi.org/10.1007/BF00682120

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  • DOI: https://doi.org/10.1007/BF00682120

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