Quantum Electrodynamics and Fundamental Constants

Abstract

The present status of precision tests of quantum electrodynamics (QED) is summarized. Precision atomic physics tests of QED are brought up to date; included is a discussion of the fine structure of positronium and hydrogen, the decay rate of positronium and ground-state hyperfine splitting in muonium and positronium. The most recent results for the anomalous magnetic moment of the electron are presented. The implications of QED for the fundamental physical constants — especially for the fine-structure constant and the Rydberg constant — are considered in connection with the Josephson and quantum Hall physics.