发表机构
Jinan University（暨南大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
利用神经网络校准的全息EMD模型，研究磁场驱动的QCD相变，发现随磁场增强由交叉过渡变为一级相变，并确定临界端点位置及相边界。
AI 中文摘要
我们利用五维爱因斯坦-麦克斯韦-膨胀子（EMD）模型，研究了零重子化学势下由磁场驱动的QCD热相变临界端点（CEP）。我们采用神经网络形式的全息径向演化，将模型校准到零磁场和有限磁场下的格点熵。随着磁场增强，热相变从平滑过渡转变为一级相变。温度转折点的合并、发散比热容以及声速平方趋零共同确定了$(eB_c,T_c)\simeq(7.22\\\\,\mathrm{GeV}^{2},95.9\\\\,\mathrm{MeV})$。$s/T^3$在过渡区的拐点定义了交叉温度，而等压麦克斯韦构造确定了一级相变的共存线。两条线在CEP处相交。相变级次的变化与格点结果定性一致。相边界是校准模型的预测结果。
英文摘要
We study the magnetic-field-driven critical end point (CEP) of the QCD thermal transition at zero baryon chemical potential using a five-dimensional Einstein--Maxwell--dilaton (EMD) model. We calibrate the model to lattice entropy at zero and finite magnetic fields using a neural-network formulation of holographic radial evolution. As the magnetic field increases, the thermal transition changes from a crossover to a first-order transition. The merger of temperature turning points, a divergent specific heat, and a vanishing squared sound speed identify $(eB_c,T_c)\simeq(7.22\,\mathrm{GeV}^{2},95.9\,\mathrm{MeV})$. The transition-region inflection of $s/T^3$ defines the crossover temperature, while an equal-pressure Maxwell construction determines the first-order coexistence line. The two lines meet at the CEP. The change of transition order agrees qualitatively with lattice results. The phase boundary is a prediction of the calibrated model.
Comments17 pages, 11 figures
