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arXiv · 2512.15094

Crossover or First-Order: Impacts of Regularization

Xin-Peng Li·Hao-Ran Zhang·Zhu-Fang Cui·Thomas Klähn
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Abstract

The equation of state of hot, dense nuclear matter plays a fundamental role in many areas. However, owing to the nonperturbative nature of strong interactions, a reliable treatment is still under debate. We use a symmetry-preserving treatment of a vector\,$\otimes$\,vector contact interaction to study related issues at nonzero temperature or quark chemical potential, and carefully compare a noncovariant and a covariant regularization scheme. The numerical results show that the character of the phase transition depends sensitively on the regularization scheme and parameter choices.

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Xin-Peng Li, Hao-Ran Zhang, Zhu-Fang Cui, Thomas Klähn. 2025-12-17. Crossover or First-Order: Impacts of Regularization. https://arxiv.org/abs/2512.15094

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