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Relative Entropy in CFT

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arxiv 1712.07283 v1 pith:SNY35TV2 submitted 2017-12-20 math.OA hep-thmath-phmath.MP

Relative Entropy in CFT

classification math.OA hep-thmath-phmath.MP
keywords relativeentropiesentropyfermionsfreeresultstheoryaddition
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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By using Araki's relative entropy, Lieb's convexity and the theory of singular integrals, we compute the mutual information associated with free fermions, and we deduce many results about entropies for chiral CFT's which are embedded into free fermions, and their extensions. Such relative entropies in CFT are here computed explicitly for the first time in a mathematical rigorous way. Our results agree with previous computations by physicists based on heuristic arguments; in addition we uncover a surprising connection with the theory of subfactors, in particular by showing that a certain duality, which is argued to be true on physical grounds, is in fact violated if the global dimension of the conformal net is greater than $1.$

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  1. Relative entropy for $\lambda \phi^4$ in the Rindler wedge

    hep-th 2026-07 accept novelty 6.5

    Relative entropy of vacuum vs coherent state for λφ⁴ in the Rindler wedge equals the classical interacting boost charge to O(λ) and obeys the Bekenstein bound.