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首页> 外文会议>Fourth Symposium on Science of Hadrons Under Extreme Conditions Mar 4-6, 2002 Jaeri, Tokai, Japan >Structural Change of Cooper Pairs in Color Superconductivity ― crossover from weak coupling to strong coupling―
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Structural Change of Cooper Pairs in Color Superconductivity ― crossover from weak coupling to strong coupling―

机译：Cooper对在颜色超导中的结构变化-从弱耦合到强耦合的转变

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摘要

The two-flavor color superconductivity is studied over a wide range of baryon density with a single model. We pay a special attention to the spatial-momentum dependence of the gap and to the spatial-structure of Cooper pairs. At extremely high baryon density (～ O(10_(ρ0)~(10)) with po being the normal nuclear matter density), our model becomes equivalent to the usual pertur-bative QCD treatment and the gap is shown to have a sharp peak near the Fermi surface due to the weak-coupling nature of QCD. On the other hand, the gap is a smooth function of the momentum at lower densities (～(10_(ρ0)) due to strong color magnetic and electric interactions. To study the structural change of Cooper pairs from high density to lower density, quark correlation in the color superconductor is studied both in the momentum space and in the coordinate space. The size of the Cooper pair is shown to become comparable to the averaged inter-quark distance at low densities. Also, effects of the momentum-dependent running coupling and the antiquark pairing, which are both small at high density, are shown to be non-negligible at low densities. These features are highly contrasted to the standard BCS superconductivity in metals.
机译：使用单个模型在重子密度的广泛范围内研究了两种风味的颜色超导性。我们特别注意间隙的空间动量依赖性和Cooper对的空间结构。在极高的重子密度下（〜O（10_（ρ0）〜（10）），po为正常核物质密度），我们的模型变得与常规微扰QCD处理等效，并且该间隙显示为尖峰由于QCD的弱耦合特性，在费米表面附近。另一方面，由于强烈的彩色磁和电相互作用，该间隙是低密度（〜（10_（ρ0））时动量的光滑函数，研究库珀对从高密度到低密度的夸克结构变化。研究了彩色超导体在动量空间和坐标空间中的相关性，表明库珀对的大小可与低密度时夸克间的平均距离相媲美，而且还取决于动量运行耦合的影响高密度的反夸克配对和低夸克的配对显示低密度时不可忽略，这些特征与金属中标准BCS超导性形成鲜明对比。

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