On the Six-Vertex Model’s Free Energy
COMMUNICATIONS IN MATHEMATICAL PHYSICS(2022)
摘要
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 Δ <1 . 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 a=b=1 and c≥ 1 , and the rotational invariance of the six-vertex model and the Fortuin–Kasteleyn percolation.
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关键词
models,energy,six-vertex
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