论文标题
重新探讨谐振费米的散装粘度：Kubo公式，总规则以及二聚体和高温极限
Bulk viscosity of resonating fermions revisited: Kubo formula, sum rule, and the dimer and high-temperature limits
论文作者
论文摘要
在两个和三个维度上都重新审视了具有零范围相互作用的两组分子的散装粘度。我们首先指出，最近的研究中采用的“标准”久保公式存在缺陷，即使在应该消失的限制的限制下，也会产生非物理发散的散装粘度。然后，经过校正的Kubo公式以及总和规则会仔细重新修复，以确认自由，单位性和二聚体限制的散装粘度确实消失了。我们还讨论了最近发现的库博形式主义与散装粘度的动力学理论之间的差异归因于以下事实：即使在高温极限下，后者假定的跨近似值也破裂。
The bulk viscosity of two-component fermions with a zero-range interaction is revisited both in two and three dimensions. We first point out that the "standard" Kubo formula employed in recent studies has flaws to give rise to an unphysical divergent bulk viscosity even in a limit where it is supposed to vanish. The corrected Kubo formula as well as the sum rule is then carefully rederived so as to confirm that the bulk viscosity indeed vanishes in the free, unitarity, and dimer limits. We also discuss that the recently found discrepancy between the Kubo formalism and the kinetic theory for the bulk viscosity is attributed to the fact that the quasiparticle approximation assumed by the latter breaks down even in the high-temperature limit.
