Titlebook: Hyperspherical Harmonics Expansion Techniques; Application to Probl Tapan Kumar Das Book 2016 Springer Nature India Private Limited 2016 Bo

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Three-Body System,f mass motion separates for a mutually interacting system. Hyperspherical coordinates and hyperangular momentum are introduced. Analytical expression for the eigenfunction (called HH) of the latter is derived. Expanding the relative wave function in the complete basis of HH and substituting in the S

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,Application to Bose–Einstein Condensates,ature. It is extremely dilute and the effective two-body interaction is given in terms of .-wave scattering length (.). Properties of BEC are discussed. The standard Gross–Pitaevskii equation (GPE) is obtained from mean field theory with contact interaction. Simplifying assumptions and limitations o