Abstract
We consider the zeros of the partition function of the Ising model with ferromagnetic pair interactions and complex external field. Under the assumption that the graph with strictly positive interactions is connected, we vary the interaction (denoted by t) at a fixed edge. It is already known that each zero is monotonic (either increasing or decreasing) in t; we prove that its motion is local: the entire trajectories of any two distinct zeros are disjoint. If the underlying graph is a complete graph and all interactions take the same value \(t\ge 0\) (i.e., the Curie-Weiss model), we prove that all the principal zeros (those in \(i[0,\pi /2)\)) decrease strictly in t.
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Acknowledgements
The research of the first and second authors was partially supported by NSFC grant 11901394. The authors thank the reviewers for valuable comments and useful suggestions on simplifying the proofs of some lemmas, which we have used in the current version of the paper.
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Communicated by Hal Tasaki.
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Hou, Q., Jiang, J. & Newman, C.M. Motion of Lee–Yang Zeros. J Stat Phys 190, 56 (2023). https://doi.org/10.1007/s10955-023-03066-x
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DOI: https://doi.org/10.1007/s10955-023-03066-x