Local correlations in the 1D Bose gas from a scaling limit of the XXZ chain

Details Local correlations in the 1D Bose gas from a scaling limit of the XXZ chain Local correlations in the 1D Bose gas from a scaling limit of the XXZ chain

2011-08-31

arxiv.org/abs/1108.6224v3

Physics

Condensed Matter

Statistical Mechanics

23 pages, 2 figures, v2: minor modifications and references added

Scientific paper

We consider the K-body local correlations in the (repulsive) 1D Bose gas for general K, both at finite size and in the thermodynamic limit. Concerning the latter we develop a multiple integral formula which applies for arbitrary states of the system with a smooth distribution of Bethe roots, including the ground state and finite temperature Gibbs-states. In the cases K<=4 we perform the explicit factorization of the multiple integral. In the case of K=3 we obtain the recent result of Kormos et.al., whereas our formula for K=4 is new. Numerical results are presented as well.

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