التفاصيل البيبلوغرافية
| العنوان: |
Resolving the puzzle of sound propagation in a dilute Bose–Einstein condensate. |
| المصدر: |
International Journal of Modern Physics B: Condensed Matter Physics; Statistical Physics; Applied Physics. 8/10/2022, Vol. 36 Issue 20, p1-9. 9p. |
| مصطلحات موضوعية: |
*ACOUSTIC wave propagation, *BOSE-Einstein condensation, *NONLINEAR wave equations, *GROSS-Pitaevskii equations, *PERTURBATION theory, *QUANTUM liquids |
| مستخلص: |
A unified model of a dilute Bose–Einstein condensate is proposed, combining the logarithmic and Gross–Pitaevskii (GP) nonlinear terms in a wave equation, where the GP term describes two-body interactions, as suggested by the standard perturbation theory; while the logarithmic term is essentially nonperturbative, and takes into account quantum vacuum effects. The model is shown to have excellent agreement with sound propagation data in the condensate of cold sodium atoms known since the now classic works by Andrews and collaborators. The data also allowed us to place constraints on two of the unified model's parameters, which describe the strengths of the logarithmic and GP terms. Additionally, we suggest an experiment constraining the value of the third parameter (the characteristic density scale of the logarithmic part of the model), using the conjectured attraction–repulsion transition of many-body interaction inside the condensate. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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