Scaling Limits as Extensions of Continuous Bundles of C*-algebras

Kade Cicchella; Benjamin H. Feintzeig

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arXiv · 2610.40924

Scaling Limits as Extensions of Continuous Bundles of C*-algebras

Kade Cicchella·Benjamin H. Feintzeig

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Abstract

We analyze scaling limits in algebraic quantum field theory using continuous bundles of C*-algebras. Different conditions of continuity on such bundles encode different strengths of approximation of the theory by its scaling limit. As a proof of concept, we consider the small-distance scaling limit of the theory of a massive free scalar field, which corresponds to a massless free scalar field. We provide a number of examples of local algebras of observables for which the corresponding bundle of C*-algebras representing the scaling limit is merely lower semicontinuous. Further, we construct an algebra of nonlocal observables for which the corresponding bundle of C*-algebras representing the scaling limit is uniformly continuous.

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Kade Cicchella, Benjamin H. Feintzeig. 2026-10-29. Scaling Limits as Extensions of Continuous Bundles of C*-algebras. https://arxiv.org/abs/2610.40924

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