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arXiv 2403.18010hep-phnucl-th
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两味色超导夸克物质在次领头阶的压力与声速

Pressure and speed of sound in two-flavor color-superconducting quark matter at next-to-leading order

Andreas Geißel, Tyler Gorda, Jens Braun

AI总结:

本文计算了两味色超导夸克物质在次领头阶的压力与声速,发现NLO修正与能隙的领头阶效应相当,并提升了这两个量在非超导夸克物质基础上的值。

摘要:

由于量子色动力学的渐近自由,处于渐近高密度下的退禁闭夸克物质是弱耦合的。在假设平凡基态的情况下,目前已知该弱耦合区域中夸克物质的体热力学性质精确至部分 next-to-next-to-next-to-leading order。然而,高密度下的基态预期为色超导体,其中(至少部分)夸克的激发谱展现出对强耦合具有非微扰依赖性的能隙。在这项工作中,我们计算了在有限能隙存在的情况下,高密度和零温度下色超导夸克物质在耦合的次领头阶(NLO)的热力学性质。我们在两无质量夸克味的极限下进行研究,这对应于退禁闭对称核物质,并进一步假设能隙与夸克化学势相比很小。在这些极限下,我们发现压力和声速的 NLO 修正与能隙的领头阶效应在大小上相当,并进一步使这两个量在其非超导夸克物质对应值之上有所增加。我们还提供了 NLO 声速的参数化,以指导高密度区域的唯象学,并进一步评论了我们的发现是否应预期扩展到与中子星相关的三味夸克物质情形。

英文摘要:

Deconfined quark matter at asymptotically high densities is weakly coupled, due to the asymptotic freedom of Quantum Chromodynamics. In this weak-coupling regime, bulk thermodynamic properties of quark matter, assuming a trivial ground state, are currently known to partial next-to-next-to-next-to-leading order. However, the ground state at high densities is expected to be a color superconductor, in which the excitation spectrum of (at least some) quarks exhibit a gap with a non-perturbative dependence on the strong coupling. In this work, we calculate the thermodynamic properties of color-superconducting quark matter at high densities and zero temperature at next-to-leading order (NLO) in the coupling in the presence of a finite gap. We work in the limit of two massless quark flavors, which corresponds to deconfined symmetric nuclear matter, and further assume that the gap is small compared to the quark chemical potential. In these limits, we find that the NLO corrections to the pressure and speed of sound are comparable in size to the leading-order effects of the gap, and further increase both quantities above their values for non-superconducting quark matter. We also provide a parameterization of the NLO speed of sound to guide phenomenology in the high-density region, and we furthermore comment on whether our findings should be expected to extend to the case of three-flavor quark matter of relevance to neutron stars.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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