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arXiv 2011.08217hep-th
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自由费米子、顶点哈密顿量和低维AdS/CFT

Free Fermions, vertex Hamiltonians, and lower-dimensional AdS/CFT

Marius de Leeuw, Chiara Paletta, Anton Pribytok, Ana L. Retore, Alessandro Torrielli

摘要:

在本文中,我们首先明确证明了PRL 125(2020)031604中最近引入的可积最近邻哈密顿算子的新模型满足所谓的自由费米子条件。这既意味着所有这些模型都可以被重新表述为自由费米子理论,也确立了这种条件的普遍性。我们明确地重铸在自由费米子形式的传输矩阵的任意数量的网站在6顶点的部门,并在两个网站在8顶点的部门,使用Bogoliubov变换。然后,我们把这个观察使用在低维情况下的AdS/CFT可积R-矩阵,特别是纯Ramond-Ramond无质量和大量的AdS_3,混合通量相对论AdS_3和无质量的AdS_2。我们还攻击类模型类似于AdS_5与我们的自由费米子机械。在所有情况下,我们使用自由费米子实现大大简化和重新解释了丰富的已知结果,并提供了一个非常有启发性的重新制定的光谱问题在所有这些情况下。

英文摘要:

In this paper we first demonstrate explicitly that the new models of integrable nearest-neighbour Hamiltonians recently introduced in PRL 125 (2020) 031604 satisfy the so-called free fermion condition. This both implies that all these models are amenable to reformulations as free fermion theories, and establishes the universality of this condition. We explicitly recast the transfer matrix in free fermion form for arbitrary number of sites in the 6-vertex sector, and on two sites in the 8-vertex sector, using a Bogoliubov transformation. We then put this observation to use in lower-dimensional instances of AdS/CFT integrable R-matrices, specifically pure Ramond-Ramond massless and massive AdS_3, mixed-flux relativistic AdS_3 and massless AdS_2. We also attack the class of models akin to AdS_5 with our free fermion machinery. In all cases we use the free fermion realisation to greatly simplify and reinterpret a wealth of known results, and to provide a very suggestive reformulation of the spectral problem in all these situations.

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