nLab
fine structure constant

Contents

Context

Fields and quanta

Algebraic Quantum Field Theory

algebraic quantum field theory (perturbative, on curved spacetimes, homotopical)

Introduction

Concepts

field theory:

Lagrangian field theory

quantization

quantum mechanical system, quantum probability

free field quantization

gauge theories

interacting field quantization

renormalization

Theorems

States and observables

Operator algebra

Local QFT

Perturbative QFT

Contents

Idea

In quantum electrodynamics the square of the coupling constant gg of the electron-photon interaction is called the fine structure constant

α=14πg 2. \alpha = \tfrac{1}{4 \pi} g^2 \,.

Historically the term originates from the fact via perturbative QFT effects such as the Lamb shift, this constant governs tiny corrections (“fine structure”) to the energy spectrum of the electron in the hydrogen atom.

References

See also

Created on January 11, 2018 at 09:47:44. See the history of this page for a list of all contributions to it.