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Single and double torsion oscillators have been used successfully to measurethe anomalous change in resonant frequency and accompanying dissipation insolid He-4. We present a glass description of the mechanical anomalies found intorsion oscillator measurements. Our results show that it is not necessary toinvoke a supersolid interpretation to explain these mechanical anomalies.Previously, we demonstrated that the back-action of a glassy subsystem presentin solid He-4 can account for frequency change and dissipation peak in manysingle torsion oscillator experiments. Here, we show that the same glassyback-action can explain the experimental results of the composite torsionoscillator developed by the Rutgers group, which measures the response of solidHe-4 at the in-phase mode f1=496 Hz and out-of-phase mode f2=1173 Hz.

The glassy response of double torsion oscillators in solid Helium-4