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Measurements on the generation and subsequent decay of vorticity in superfluid He-3-B

Research output: Contribution in Book/Report/ProceedingsConference contribution

Published

Publication date1998
Host publicationCOSMO-97: First International Workshop on Particle Physics and the Early Universe
EditorsL Roszkowski
Place of publicationSingapore
PublisherWorld Scientific
Pages432-434
Number of pages3
ISBN (Print)9789810235277
Original languageEnglish

Conference

Conference1st International Workshop on Particle Physics and the Early Universe (COSMO-97)
CityAMBLESIDE
Period15/09/9719/09/97

Conference

Conference1st International Workshop on Particle Physics and the Early Universe (COSMO-97)
CityAMBLESIDE
Period15/09/9719/09/97

Abstract

Recent measurements in superfluid He-3-B have been interpreted as evidence in support of the Kibble-Zurek hypothesis for the formation of defects in the early Universe. The superfluid He-3 analogue to the cosmic string is the quantum vortex. We report here the first observations on the production and decay of this vorticity in superfluid He-3-B at temperatures down to similar to 110 mu K. We detect the heat evolution of the decaying vorticity after neutron irradiation of a small superfluid He-3-B sample. We interpret the decay process in terms of a simple exponential time constant which varies inversely proportional to the quasiparticle excitation number density in the superfluid. We also observe that the fraction of the neutron energy deposited in the vorticity is consistent with the earlier measurements which supported the Kibble-Zurek hypothesis.