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Vortex stretching as a mechanism for quantum kinetic energy decay

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Kerr, Robert M. (Robert McDougall) (2011) Vortex stretching as a mechanism for quantum kinetic energy decay. Physical Review Letters, Vol.106 (No.22). Article: 224501. doi:10.1103/PhysRevLett.106.224501

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Official URL: http://dx.doi.org/10.1103/PhysRevLett.106.224501

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Abstract

A pair of perturbed anti-parallel quantum vortices, simulated using the three-dimensional Gross-Pitaevskii equations, is shown to be unstable to vortex stretching. This results in kinetic energy K∇ψ being converted into interaction energy EI and eventually local kinetic energy depletion that is similar to energy decay in a classical uid, even though the governing equations are Hamiltonian and energy conserving. The intermediate stages include: the generation of vortex waves, their deepening, multiple reconnections, the emission of vortex rings and phonons and the creation of an approximately -5/3 kinetic energy spectrum at high wavenumbers. All the wave generation and reconnection steps follow from interactions between the two original vortices, unlike the self- interactions in vortex wave models. A four vortex example is given to demonstrate that some of these steps might be general.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Engineering
Faculty of Science > Mathematics
Library of Congress Subject Headings (LCSH): Quantum theory, Topological defects (Physics), Superfluidity
Journal or Publication Title: Physical Review Letters
Publisher: American Physical Society
ISSN: 0031-9007
Official Date: 1 June 2011
Dates:
DateEvent
1 June 2011Published
Volume: Vol.106
Number: No.22
Number of Pages: 4
Page Range: Article: 224501
DOI: 10.1103/PhysRevLett.106.224501
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: Leverhulme Trust (LT), European Union (EU)
Grant number: F/00215/AC (LT)

Data sourced from Thomson Reuters' Web of Knowledge

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