Canonical Quantization of the Scalar Field: The Measure Theoretic Perspective

José Velhinho

Published 2023-11-19Version 1

This review is devoted to measure theoretical methods in the canonical quantization of scalar field theories. We present in some detail the canonical quantization of the free scalar field. We study the measures associated with the free fields and present two characterizations of the support of these measures. The first characterization concerns local properties of the quantum fields, whereas for the second one we introduce a sequence of variables that test the field behaviour at large distances, thus allowing to distinguish between the typical quantum fields associated with different values of the mass.