Difference between revisions of "Arxiv Selection Dec 2018"
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Dec 1-Dec 7 Zehan Li, Dec 8-Dec 14 Jiansong Pan, Dec 15-Dec 21 Ahmet Keles, Dec 22- Dec 28 Haiping Hu | Dec 1-Dec 7 Zehan Li, Dec 8-Dec 14 Jiansong Pan, Dec 15-Dec 21 Ahmet Keles, Dec 22- Dec 28 Haiping Hu | ||
| + | ==Dec. 4 == | ||
| + | |||
| + | arXiv:1812.00473 [pdf, other] | ||
| + | |||
| + | Quantum vortex reconnections: crossover from interaction to driven regimes | ||
| + | |||
| + | Luca Galantucci, Andrew W. Baggaley, Nick G. Parker, Carlo F. Barenghi | ||
| + | |||
| + | Comments: 9 pages, 8 Figures main manuscript; 7 pages, 3 Figures Supporting Information | ||
| + | |||
| + | Subjects: Quantum Gases (cond-mat.quant-gas) | ||
| + | |||
| + | Reconnections of coherent filamentary structures play a key role in the dynamics of fluids, redistributing energy and helicity among the length scales, triggering dissipative effects and inducing | ||
| + | fine-scale mixing. Unlike ordinary (classical) fluids where vorticity is a continuous field, in superfluid helium and in atomic Bose-Einstein condensates (BECs) vorticity takes the form of isolated | ||
| + | quantised vortex lines, which are conceptually easier to study. New experimental techniques now | ||
| + | allow visualisation of individual vortex reconnections in helium and condensates. It has long being | ||
| + | suspected that reconnections obey universal laws, particularly a universal scaling with time of the | ||
| + | minimum distance between vortices δ. Here we perform a comprehensive analysis of this scaling | ||
| + | across a range of scenarios relevant to superfluid helium and trapped condensates, combining our | ||
| + | own numerical simulations with the previous results in the literature. We reveal that the scaling exhibit two distinct regimes: a δ ∼ t | ||
| + | 1/2 | ||
| + | scaling arising from the mutual interaction of the reconnecting | ||
| + | strands and a δ ∼ t scaling when extrinsic factors drive the individual vortices | ||
==Dec. 3 == | ==Dec. 3 == | ||
Revision as of 19:04, 5 December 2018
Dec 1-Dec 7 Zehan Li, Dec 8-Dec 14 Jiansong Pan, Dec 15-Dec 21 Ahmet Keles, Dec 22- Dec 28 Haiping Hu
Dec. 4
arXiv:1812.00473 [pdf, other]
Quantum vortex reconnections: crossover from interaction to driven regimes
Luca Galantucci, Andrew W. Baggaley, Nick G. Parker, Carlo F. Barenghi
Comments: 9 pages, 8 Figures main manuscript; 7 pages, 3 Figures Supporting Information
Subjects: Quantum Gases (cond-mat.quant-gas)
Reconnections of coherent filamentary structures play a key role in the dynamics of fluids, redistributing energy and helicity among the length scales, triggering dissipative effects and inducing fine-scale mixing. Unlike ordinary (classical) fluids where vorticity is a continuous field, in superfluid helium and in atomic Bose-Einstein condensates (BECs) vorticity takes the form of isolated quantised vortex lines, which are conceptually easier to study. New experimental techniques now allow visualisation of individual vortex reconnections in helium and condensates. It has long being suspected that reconnections obey universal laws, particularly a universal scaling with time of the minimum distance between vortices δ. Here we perform a comprehensive analysis of this scaling across a range of scenarios relevant to superfluid helium and trapped condensates, combining our own numerical simulations with the previous results in the literature. We reveal that the scaling exhibit two distinct regimes: a δ ∼ t 1/2 scaling arising from the mutual interaction of the reconnecting strands and a δ ∼ t scaling when extrinsic factors drive the individual vortices
Dec. 3
arXiv:1811.12743 [pdf, ps, other]
Superfluidity in dipolar binary Bose mixtures
Abdelaali Boudjemaa
Comments: 7 pages, 4 figures
Subjects: Quantum Gases (cond-mat.quant-gas)
We study the superfluidity and the coherence in dipolar binary Bose mixtures using the hydrodynamic approach. Useful analytical formula for the excitations spectrum, the correlation function and the superfluid fraction are derived. We find that in the case of highly imbalanced mixture, the superfluidity can occur in the dilute component only at extremely low temperatures. The behavior of the first-order correlation function for both dipolar and nondipolar Bose mixtures is deeply analyzed. Then we face the two-dimensional case which encodes a non-trivial physics due to the roton modes.
