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A decrease in the rotational period observed in torsional oscillatormeasurements was recently taken as a possible indication of a supersolid stateof helium. We reexamine this interpretation and note that the decrease in therotation period is also consistent with a solidification of a small liquid-likecomponent into a low-temperature glass. Such a solidification may occur by alow-temperature quench of topological defects (e.g., grain boundaries ordislocations) which we examined in an earlier work. The low-temperature glasscan account for not only a monotonic decrease in the rotation period as thetemperature is lowered but also explains the peak in the dissipation occurringnear the transition point. Unlike the non-classical rotational inertiascenario, which depends on the supersolid fraction, the dependence of therotational period on external parameters, e.g., the oscillator velocity,provides an alternate interpretation of the oscillator experiments. Futureexperiments might explore this effect.Comment: 10 pages, 3 figures; to appear in Phys. Rev.

physical review. b, condensed matter and materials physics

Origin of the decrease in the torsional-oscillator period of solid<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">He</mml:mi><mml:mprescripts /><mml:none /><mml:mn>4</mml:mn></mml:mmultiscripts></mml:math>

Origin of the decrease in the torsional-oscillator period of solidHe4