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arXiv 1104.2819nucl-th
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介质中手性缩合物的热力学

Thermodynamics of the in-medium chiral condensate

S. Fiorilla, N. Kaiser, W. Weise

摘要:

从关联核多体系统的实际自由能量密度出发,研究了不同重子密度下同位旋对称核物质中手征凝聚体的温度依赖性.该框架是热介质中的手征有效场论,它允许一个系统的计算夸克质量的自由能量密度的依赖。一个和两个π介子交换过程,虚拟$Δ(1232)$ -同量异位素激发和泡利阻塞校正处理,并包括三个回路的顺序。结果表明,至少在温度为$T\lesssim 100\,$ MeV,重子密度为正常核物质密度的2倍时,核物质仍处于手征对称性自发破缺的南部-戈德斯通相。

英文摘要:

The temperature dependence of the chiral condensate in isospin-symmetric nuclear matter at varying baryon densities is investigated starting from a realistic free energy density of the correlated nuclear many-body system. The framework is thermal in-medium chiral effective field theory which permits a systematic calculation of the quark mass dependence of the free energy density. One- and two-pion exchange processes, virtual $Δ(1232)$-isobar excitations and Pauli blocking corrections are treated up to and including three-loop order. It is found that nuclear matter remains in the Nambu-Goldstone phase with spontaneously broken chiral symmetry at least in the range of temperatures $T\lesssim 100\,$MeV and baryon densities up to about twice the density of normal nuclear matter.

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