Lectures on measurement in quantum field theory
Abstract
These lectures present a brief introduction to measurement theory for QFT in possibly curved spacetimes introduced by the author and R. Verch [Comm. Math. Phys. 378 (2020) 851-889]. Topics include: a brief introduction to algebraic QFT, measurement schemes in QFT, state updates, multiple measurements and the resolution of Sorkin's "impossible measurement" problem. Examples using suitable theories based on Green hyperbolic operators are given, and the interpretational significance of the framework is briefly considered. The basic style is to give details relating to QFT while taking for granted various facts from the theory of globally hyperbolic spacetimes.
Cite
@article{arxiv.2504.17437,
title = {Lectures on measurement in quantum field theory},
author = {Christopher J. Fewster},
journal= {arXiv preprint arXiv:2504.17437},
year = {2025}
}
Comments
21pp. Lectures at the EMS-IAMP Spring School, "Symmetry and Measurement in Quantum Field Theory", York 7-11 April, 2025