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arXiv 2201.10549cond-mat.stat-mechcond-mat.quant-gasquant-ph
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BBGKY体系与广义流体力学

BBGKY Hierarchy and Generalised Hydrodynamics

Bruno Bertini, Fabian H. L. Essler, Etienne Granet

摘要:

我们考虑费米子定义在一个连续的一维区间和弱排斥两体相互作用。我们表明,它是可能的微扰构建一个广泛的相互兼容的保守电荷的任何相互作用的潜力。然而,在第二阶和更高的这些电荷的密度的贡献一般是非本地的,并成为空间本地化,只有当潜在的满足一定的兼容性条件。我们证明,这些条件的第一个唯一的解决方案是千Shigehara潜力(费米子对偶的Lieb-Liniger模型)和Calogero-Sutherland潜力。我们使用我们的建设,以显示如何广义流体动力学(GHD)出现从Bogoliubov-Born-Green-Kirkwood-Yvon的层次,并认为GHD在弱相互作用制度下是强大的不可积扰动。

英文摘要:

We consider fermions defined on a continuous one-dimensional interval and subject to weak repulsive two-body interactions. We show that it is possible to perturbatively construct an extensive number of mutually compatible conserved charges for any interaction potential. However, the contributions to the densities of these charges at second order and higher are generally non-local and become spatially localized only if the potential fulfils certain compatibility conditions. We prove that the only solutions to the first of these conditions are the Cheon-Shigehara potential (fermionic dual to the Lieb-Liniger model) and the Calogero-Sutherland potentials. We use our construction to show how Generalized Hydrodynamics (GHD) emerges from the Bogoliubov--Born--Green--Kirkwood--Yvon hierarchy, and argue that GHD in the weak interaction regime is robust under non-integrable perturbations.

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