In this paper, we provide new proofs of the existence and the condensation of Bethe roots for the Bethe Ansatz equation associated with the six-vertex model with periodic boundary conditions and an arbitrary density of up arrows (per line) in the regime . As an application, we provide a short, fully rigorous computation of the free energy of the six-vertex model on the torus, as well as an asymptotic expansion of the six-vertex partition functions when the density of up arrows approaches 1/2. This latter result is at the base of a number of recent results, in particular the rigorous proof of continuity/discontinuity of the phase transition of the random-cluster model, the localization/delocalization behaviour of the six-vertex height function when and , and the rotational invariance of the six-vertex model and the Fortuin-Kasteleyn percolation.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9569319PMC
http://dx.doi.org/10.1007/s00220-022-04459-xDOI Listing

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