English

Local topological order, Haag duality, and reflection positivity

Mathematical Physics 2026-05-12 v1 Strongly Correlated Electrons math.MP Operator Algebras Quantum Physics

Abstract

In our previous article [arXiv:2307.12552], we introduced local topological order (LTO) axioms for abstract quantum spin systems which allow one to access topological order via a boundary algebra construction. Using the LTO axioms, we produced a canonical pure state on the quasi-local algebra, which gives a net of von Neumann algebras associated to a poset of cones in Rn\mathbb{R}^n. In this article, motivated by [arXiv:2509.23734], we introduce an axiom for LTOs which ensures Haag duality for cone-like regions using Tomita-Takesaki theory. We prove this axiom is satisfied for all known topologically ordered commuting projector models. We thus get an independent proof of Haag duality for the Levin-Wen string net models originally proved in [arXiv:2509.23734]. We also give a reflection positivity axiom for LTOs, connecting to the recent article [arXiv:2510.20662]. We again prove this axiom is satisfied for all known topologically ordered commuting projector models about some Z/2\mathbb{Z}/2-reflection symmetry.

Cite

@article{arxiv.2605.10693,
  title  = {Local topological order, Haag duality, and reflection positivity},
  author = {Pieter Naaijkens and David Penneys and Daniel Wallick},
  journal= {arXiv preprint arXiv:2605.10693},
  year   = {2026}
}

Comments

30 pages. Comments welcome!

R2 v1 2026-07-22T07:04:41.897Z