在手征平均场状态方程中纳入热介子与介子共振
Including Thermal Mesons and Meson Resonances in the Chiral Mean-Field Equation of State
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中文总结 AI 辅助
本研究在手征平均场模型中引入热介子与介子共振自由度，以改进高温下状态方程，并与格点QCD结果对比验证其有效性。
中文摘要 AI 辅助
手征平均场（CMF）模型通过标量和矢量介子平均场相互作用的重子和夸克来描述致密物质。在平均场近似中，介子场被其期望值所替代。它们在产生相互作用和介质内性质方面的作用得以保留，但显式的热介子激发却缺失了。这在高温下变得越来越成问题，因为此时介子对强子物质的热力学性质有显著贡献。在此，我们保留CMF对致密物质的原始描述，并利用MUSES框架中强子共振气体（HRG）模块的介子扇区来添加热介子自由度。基态赝标量和矢量介子弥补了缺失的热激发，而介子共振则在HRG图像内通过共振形成提供了对介子相互作用的有效描述。我们研究了这些贡献如何影响压强、熵密度、能量密度和重子密度，并将所得状态方程与连续体外推的格点量子色动力学计算结果进行了比较。
英文摘要
The Chiral Mean-Field (CMF) model describes dense matter in terms of baryons and quarks interacting through scalar and vector meson mean fields. In the mean-field approximation, the meson fields are replaced by their expectation values. Their role in generating interactions and in-medium properties is retained, but explicit thermal mesonic excitations are absent. This becomes increasingly problematic at high temperature, where mesons contribute significantly to the thermodynamics of hadronic matter. Here, we keep the original CMF description of dense matter and add the thermal mesonic degrees of freedom using the mesonic sector of the Hadron Resonance Gas (HRG) module in the MUSES framework. Ground-state pseudoscalar and vector mesons account for the missing thermal excitations, while mesonic resonances provide, within the HRG picture, an effective description of mesonic interactions through resonance formation. We study how these contributions affect the pressure, entropy density, energy density, and baryon density, and compare the resulting equation of state with continuum-extrapolated lattice-QCD calculations.
发表机构
- Kent State University（肯特州立大学）
- University of Houston（休斯顿大学）
- Case Western Reserve University（凯斯西储大学）
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