二维相互作用玻色子的谱函数和准粒子阻尼
Spectral function and quasi-particle damping of interacting bosons in two dimensions
摘要：
本文利用泛函重整化群研究了二维玻色气体的动力学性质。我们的方法是免费的红外发散，这困扰着通常的图解方法，是与确切的Nepomnyashchy恒等式，它指出，异常的自能消失在零频率和动量一致。我们恢复正确的传播子的红外行为，并提出明确的结果的谱线的形状，从中我们提取准粒子的色散和阻尼。
英文摘要：
We employ the functional renormalization group to study dynamical properties of the two-dimensional Bose gas. Our approach is free of infrared divergences, which plague the usual diagrammatic approaches, and is consistent with the exact Nepomnyashchy identity, which states that the anomalous self-energy vanishes at zero frequency and momentum. We recover the correct infrared behavior of the propagators and present explicit results for the spectral line-shape, from which we extract the quasi-particle dispersion and damping.
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