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arXiv · 2605.19964

Lee-Yang zeros and edge singularity in a mean-field approach

Tatsuya Wada·Győző Kovács·Masakiyo Kitazawa·Takahiro M. Doi
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Abstract

The analytic structure of the partition function in finite-volume systems is investigated at complex chemical potentials in a minimal mean-field effective model of QCD with finite-size effects incorporated. We discuss the temperature dependence of the Lee-Yang zeros and their relation to the edge singularity for various system sizes. Different methods for locating the critical point based on finite-size scaling of Lee-Yang zeros and susceptibility ratios are compared. We demonstrate that these methods can successfully identify the critical point, whereas a careful treatment of corrections from irrelevant operators is crucial for its accurate determination.

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Tatsuya Wada, Győző Kovács, Masakiyo Kitazawa, Takahiro M. Doi. 2026-05-19. Lee-Yang zeros and edge singularity in a mean-field approach. https://arxiv.org/abs/2605.19964

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