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On the modular operator of mutli-component regions in chiral CFT

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arxiv 1904.08201 v2 pith:OPKE2DG7 submitted 2019-04-17 hep-th math-phmath.MPquant-ph

On the modular operator of mutli-component regions in chiral CFT

classification hep-th math-phmath.MPquant-ph
keywords modularregionschiralproblemalonganalyticityapproachcomplex
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We introduce a new approach to find the Tomita-Takesaki modular flow for multi-component regions in general chiral conformal field theory. Our method is based on locality and analyticity of primary fields as well as the so-called Kubo-Martin-Schwinger (KMS) condition. These features can be used to transform the problem to a Riemann-Hilbert problem on a covering of the complex plane cut along the regions, which is equivalent to an integral equation for the matrix elements of the modular Hamiltonian. Examples are considered.

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  1. Uniqueness of null-local modular flow

    hep-th 2026-07 conditional novelty 7.0

    For the free massless scalar in a Minkowski causal diamond, the vacuum is the unique state or weight in the vacuum sector whose modular flow is local on the null boundary.