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We calculated the glassy response of solid He-4 to torsional oscillationsassuming a phenomenological glass model. Making only a few assumptions aboutthe distribution of glassy relaxation times in a small subsystem of otherwiserigid solid He-4, we can account for the magnitude of the observed period shiftand concomitant dissipation peak in several torsion oscillator experiments. Theimplications of the glass model for solid He-4 are threefold: (1) The dynamicsof solid He-4 is governed by glassy relaxation processes. (2) The distributionof relaxation times varies significantly between different torsion oscillatorexperiments. (3) The mechanical response of a torsion oscillator does notrequire a supersolid component to account for the observed anomaly at lowtemperatures, though we cannot rule out its existence.

The glassy response of solid He-4 to torsional oscillations