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Vortex stretching as a mechanism for quantum kinetic energy decay

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Kerr, Robert M.. (2011) Vortex stretching as a mechanism for quantum kinetic energy decay. Physical Review Letters, Vol.106 (No.22). Article: 224501. ISSN 0031-9007

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

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:

Date	Event
1 June 2011	Published

Volume:

Vol.106

Number:

No.22

Number of Pages:

Page Range:

Article: 224501

Identification Number:

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)

References:

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