Bose–Einstein Condensation in Dilute Gases: Appendix. Fundamental constants and conversion factors
Bose–Einstein Condensation in Dilute Gases: Appendix. Fundamental constants and conversion factors
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DOI：
10.1017/cbo9780511755583.016
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发表时间：
2008-09
期刊：
影响因子：
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通讯作者：
C. Pethick;H. Smith
中科院分区：
文献类型：
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作者：
C. Pethick;H. Smith
并用它们来确定均匀气体和被困云中的元激发。我们描述的方法计算集体性质的云陷阱。这些方法包括高斯-费米近似和基于集体坐标思想的变分方法。该方法适用于处理振荡的球对称和各向异性的陷阱，和自由膨胀的凝聚。我们证明，由于非线性和色散的综合影响，玻色-爱因斯坦凝聚体的运动方程存在孤子解。
and use them to determine the elementary excitations in a uniform gas and in a trapped cloud. We describe methods for calculating collective properties of clouds in traps. These include the Thomas–Fermi approximation and a variational approach based on the idea of collective coordinates. The methods are applied to treat oscillations in both spherically-symmetric and anisotropic traps, and the free expansion of the condensate. We show that, as a result of the combined influence of non-linearity and dispersion, there exist soliton solutions to the equations of motion for a Bose–Einstein condensate.