标题： 高密NJL_{2+1}的超流体流 显示英文标题

标题： Supercurrent Flow in NJL_{2+1} at High Baryon Density

摘要： 我们展示了具有非零重子化学势 μ 和空间可变复数二夸克源强 j 的2+1维 Nambu-Jona-Lasinio 模型的数值模拟结果。通过使 arg(j) 在整个晶格的空间范围平滑地变化 2π，诱导出一个重子数流，该流在高密度相中当 |j|→0 时仍保持非零；因此我们能够提取出一个表征超流体的特征量，即扭度模量。我们也研究了非零温度下的超流电流流动，并估算出了正常相恢复的临界温度，这与薄膜超流体的传统观点一致，在传统观点中，相变被视为涡旋-反涡旋解离的结果。 显示英文摘要

摘要： We present results of numerical simulations of the 2+1d Nambu -- Jona-Lasinio model with non-zero baryon chemical potential mu and spatially-varying complex diquark source strength j. By choosing arg(j) to vary smoothly through 2 pi across the spatial extent of the lattice, a baryon number current is induced which in the high density phase remains non-vanishing as |j|->0; we are hence able to extract a quantity characteristic of a superfluid known as the helicity modulus. We also study supercurrent flow at non-zero temperature and estimate the critical temperature at which the normal phase is restored, which is consistent with the conventional picture for thin-film superfluids in which the transition is viewed in terms of vortex -- anti-vortex unbinding.