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SYFA: Symposium Foundational Aspects of Quantum Theory

SYFA 1: Foundational Aspects of Quantum Theory

SYFA 1.2: Invited Talk

Monday, September 8, 2025, 11:25–12:05, ZHG010

Locality and its generalizations in quantum field theory — •Kasia Rejzner — University of York, York, UK

The principle of locality has been one of the guiding principles underlying quantum field theory (QFT). It is crucial in the Haag-Kastler framework of algebraic quantum field theory (AQFT) and it has been generalized to curved spacetimes through the principle of general local covariance. However, the simple idea of localization in relatively compact regions fails already in gauge theories (e.g. Dirac string or Wilson loops) and in quantum gravity one expects observables that are relational in nature, hence non-local. In this talk I will argue that non-locality enters QFT in a natural way when we consider measurements and introduce quantum reference frames.

Keywords: quantum field theory; quantum reference frames; locality