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J. Math. Phys. 52, 122106 (2011); http://dx.doi.org/10.1063/1.3663431 (17 pages)

The propagator of the attractive delta-Bose gas in one dimension

Sylvain Prolhac and Herbert Spohn

Zentrum Mathematik and Physik Department, Technische Universität München, D-85747 Garching, Germany

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(Received 23 September 2011; accepted 2 November 2011; published online 30 December 2011)

We consider the quantum δ-Bose gas on the infinite line. For repulsive interactions, Tracy and Widom have obtained an exact formula for the quantum propagator. In our contribution we explicitly perform its analytic continuation to attractive interactions. We also study the connection to the expansion of the propagator in terms of the Bethe ansatz eigenfunctions. Thereby we provide an independent proof of their completeness.

© 2011 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. δ-BOSE GAS WITH REPULSIVE INTERACTION (κ < 0)
  3. δ-BOSE GAS WITH ATTRACTIVE INTERACTION (κ > 0)
  4. ANALYTIC CONTINUATION FROM κ < 0 To κ > 0
    1. Contribution of the residues
    2. Partitions and permutations
    3. Pole structure of the integrand and summation over Bethe eigenstates
  5. THE SPECIAL CASE x = y = 0
  6. CONCLUSIONS

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0022-2488 (print)  
1089-7658 (online)

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