On the ground state of an interacting boson system

Biswas, A. C. ; Warke, C. S. (1979) On the ground state of an interacting boson system Physics Letters A, 71 (1). pp. 6-8. ISSN 0375-9601

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Related URL: http://dx.doi.org/10.1016/0375-9601(79)90860-0


We prove that the interacting boson system has three phases within the Hartree-Bose approximation. The low-density phase is the usual Bose-Einstein condensate while the high-density phase corresponds to the state in which a larger fraction of Bose condensate particles are paired in one non-zero momentum state. In the intermediate-density phase all the particles are paired in a non-zero momentum state. It is observed that the ground state in the new phases is an infinitely degenerate state contrary to the non-degenerate Bose-Einstein condensate.

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