Simplified approach to the ground-state energy of an imperfect Bose gas. III. Application to the one-dimensional model

Elliott Lieb, Werner Liniger

Research output: Contribution to journalArticle

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Abstract

We continue the study of the integrodifferential equation proposed previously for the evaluation of the ground-state energy of an imperfect Bose gas. We apply it here to the one-dimensional delta-function gas where the exact result is known for all values of the coupling constant. The results are: (i) For small, the equation gives the correct first two terms in an asymptotic series; (ii) a numerical solution of the equation shows that the maximum relative error occurs for = in which case it is 19%; (iii) for = we are able to compare the exact two-particle distribution function with that given by the equation. The agreement is quite good.

Original languageEnglish (US)
JournalPhysical Review
Volume134
Issue number2A
DOIs
StatePublished - Dec 1 1964

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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