2002 Fiscal Year Final Research Report Summary
Decay of a quantized vortex tangle at a very low temperature
| Project/Area Number |
12640357
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
固体物性Ⅱ(磁性・金属・低温)
|
|---|
| Research Institution | Osaka City University |
|---|
Principal Investigator |
TSUBOTA Makoto Osaka City University, Graduate School, Department of Physics, Associate Professor, 大学院・理学研究科, 助教授 (10197759)
|
|---|
| Project Period (FY) |
2000 – 2002
|
| Keywords | Superfluid helium / Quantized vortex / Superfluid turbulence / Bose-Einstein condensation / Gross-Pitaevskii equation / Kolmogorov law |
|---|
| Research Abstract |
We studied theoretically and numerically the vortex dynamics in superfluid helium and Bose-Einsteincondensate of Alkali atomic gas. The obtained results are the following.
Superfluid helium : We studied the energy spectrum of superfluid turbulent state, thus finding the Kolmogorov -5/3 law which is the most important statistical law in classical turbulence. The diffusion of a vortex tangle is studied. The vortex tangle under rotation was found to be polarized along the rotational axis.
Alkali atomic Bose-Einstein condensate : By studying numerically the Gross-Pitaevskii equation under rotation, we found that the condensate undergoes elliptic deformation, followed by unstable surface-mode excitations before forming a quantized vortex lattice; the results are qualitatively consistent with the experimental results.
|
