Soft Interactions in Cold Quark Matter,Physical Review Letters

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Soft Interactions in Cold Quark Matter
Physical Review Letters ( IF 8.1 ) Pub Date : 2021-10-15 , DOI: 10.1103/physrevlett.127.162003
Tyler Gorda _{1,

2} , Aleksi Kurkela ₃ , Risto Paatelainen ₄ , Saga Säppi _{4,

5} , Aleksi Vuorinen ₄

Affiliation

Accurate knowledge of the thermodynamic properties of zero-temperature, high-density quark matter plays an integral role in attempts to constrain the behavior of the dense QCD matter found inside neutron-star cores, irrespective of the phase realized inside the stars. In this Letter, we consider the weak-coupling expansion of the dense QCD equation of state and compute the next-to-next-to-next-to-leading-order contribution arising from the non-Abelian interactions among long-wavelength, dynamically screened gluonic fields. Accounting for these interactions requires an all-loop resummation, which can be performed using hard-thermal-loop (HTL) kinematic approximations. Concretely, we perform a full two-loop computation using the HTL effective theory, valid for the long-wavelength, or soft, modes. We find that the soft sector is well behaved within cold quark matter, contrary to the case encountered at high temperatures, and find that the new contribution decreases the renormalization-scale dependence of the equation of state at high density.

中文翻译：

冷夸克物质中的软相互作用

零温度、高密度夸克物质的热力学性质的准确知识在试图限制中子星核心内发现的致密 QCD 物质的行为方面起着不可或缺的作用，而不管恒星内部实现的相位如何。在这封信中，我们考虑了稠密 QCD 状态方程的弱耦合展开，并计算了由长波长之间的非阿贝尔相互作用产生的 next-to-next-to-next-to-lead-order 贡献，动态筛选的胶子场。考虑到这些相互作用需要全回路求和，这可以使用硬热回路 (HTL) 运动学近似来执行。具体来说，我们使用 HTL 有效理论执行完整的两循环计算，对长波长或软模式有效。

更新日期：2021-10-17

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