Bulk viscosity in a cold CFL superfluid
Bulk viscosity in a cold CFL superfluid
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DOI：
10.1088/1475-7516/2007/08/001
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发表时间：
2007-05
影响因子：
6.4
通讯作者：
C. Manuel;F. Llanes-Estrada
中科院分区：
文献类型：
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作者：
C. Manuel;F. Llanes-Estrada
我们计算了一个冷色味锁（CFL）夸克物质的体粘滞系数的温度制度的介子，夸克和胶子的贡献输运现象是玻尔兹曼抑制。在这种情况下，耗散是由于超流声子的碰撞而发生的，而戈德斯通模式与重子对称性的自发破缺有关。我们首先回顾了相对论性超流体的流体力学，并回顾了这些系统中至少有三个体粘滞系数。然后，我们计算与超流体的正常流体成分相关联的体粘滞系数。在我们的分析中，我们使用儿子的有效场理论的超流声子，修正，包括规模打破效应的平方成比例的奇异夸克质量ms。我们计算的体积粘度在领先的顺序在规模打破参数，并发现它是占主导地位的共线分裂和加入过程。由此产生的输运系数为ε = 0.011 ms 4/T，在低温T下增长，直到声子流体描述停止有意义。我们的结果对于研究CFL夸克物质形成的致密星星的转动性质是有意义的。
We compute one of the bulk viscosity coefficients of cold color–flavor locked (CFL) quark matter in the temperature regime where the contribution of mesons, quarks and gluons to transport phenomena is Boltzmann suppressed. In that regime dissipation occurs due to collisions of superfluid phonons, the Goldstone modes associated to the spontaneous breaking of baryon symmetry. We first review the hydrodynamics of relativistic superfluids, and recall that there are at least three bulk viscosity coefficients in these systems. We then compute the bulk viscosity coefficient associated to the normal fluid component of the superfluid. In our analysis we use Son’s effective field theory for the superfluid phonon, amended to include scale breaking effects proportional to the square of the strange quark mass ms. We compute the bulk viscosity at leading order in the scale breaking parameter, and find that it is dominated by collinear splitting and joining processes. The resulting transport coefficient is ζ = 0.011 ms4/T, growing at low temperature T until the phonon fluid description stops making sense. Our results are relevant for studying the rotational properties of a compact star formed by CFL quark matter.