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arXiv · 1608.07548

Non Relativistic Limit of Integrable QFT and Lieb-Liniger Models

Alvise Bastianello·Andrea De Luca·Giuseppe Mussardo
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Abstract

In this paper we study a suitable limit of integrable QFT with the aim to identify continuous non-relativistic integrable models with local interactions. This limit amounts to sending to infinity the speed of light c but simultaneously adjusting the coupling constant g of the quantum field theories in such a way to keep finite the energies of the various excitations. The QFT considered here are Toda Field Theories and the O(N) non-linear sigma model. In both cases the resulting non-relativistic integrable models consist only of Lieb-Liniger models, which are fully decoupled for the Toda theories while symmetrically coupled for the O(N) model. These examples provide explicit evidence of the universality and ubiquity of the Lieb-Liniger models and, at the same time, suggest that these models may exhaust the list of possible non-relativistic integrable theories of bosonic particles with local interactions.

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Alvise Bastianello, Andrea De Luca, Giuseppe Mussardo. 2016-08-26. Non Relativistic Limit of Integrable QFT and Lieb-Liniger Models. https://doi.org/10.1088/1742-5468/aa4f98

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