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Relativistic Quantum Field Theory, Volume 2

Path integral formalism
Michael Strickland


Volume 2 of this three-part series presents the quantization of classical field theory using the path integral formalism. For students who wish to learn about relativistic quantum field theory applied to particle physics, this accessible text is also useful for students of condensed matter. Beginning with an introduction of the path integral formalism for non-relativistic quantum mechanics, the formalism is extended to quantum fields with an infinite number of degrees of freedom. How to quantize gauge fields using the Fadeev–Popov method, and fermionic fields using Grassman algebra, is also explored before the path integral formulation of quantum chromodynamics and its renormalization is presented. Finally, the role played by topological solutions in non-abelian gauge theories is discussed.

About Editors

Michael Strickland is a professor of physics at Kent State University. His primary interest is the physics of the quark–gluon plasma (QGP) and high-temperature quantum field theory (QFT). He has published research papers on various topics related to the QGP, QFT, relativistic hydrodynamics and many other topics. In addition, he has co-written a text on the physics of neural networks.

Table of Contents

1 Path integral formulation of quantum mechanics

1.1 The transition probability amplitude

1.2 Derivation of the quantum mechanical path integral

1.3 Path integral in terms of the Lagrangian

1.4 Computing simple path integrals

1.5 Calculating time-ordered expectation values

1.6 Adding sources

1.7 Asymptotic states and vacuum-vacuum transitions

1.8 Generating functional and Green's function for quadratic theories

1.9 Euclidean path integral and the statistical mechanics partition function


2 Path integrals for scalar fields

2.1 Generating functional for a free real scalar field

2.2 Interacting real scalar field theory

2.3 Generating functional for connected diagrams

2.4 The self-energy

2.5 The effective action and vertex functions

2.6 Interacting complex scalar fields


3 Path integrals for fermionic fields

3.1 Finite-dimensional Grassmann algebra

3.2 Path integral for a free Dirac field

3.3 Path integral for an interacting Dirac field

3.4 Fermion loops


4 Path integrals for abelian gauge fields

4.1 Free abelian gauge theory

4.2 The photon propagator

4.3 Generating functional for abelian gauge fields in general Lorenz gauge

4.4 Generating functional for QED in general Lorenz gauge

4.5 General Lorenz-gauge QED generating functional to O(e2)

4.6 QED effective action and vertex functions

4.7 Ward-Takahashi identities


5 Groups and Lie groups

5.1 Group theory basics

5.2 Examples

5.3 Representations of groups

5.4 The group U(1)

5.5 The group SU(2)

5.6 The group SU(3)

5.7 The group SU(N)

5.8 The Haar measure


6 Path integral formulation of quantum chromodynamics

6.1 The Fadeev-Popov method

6.2 QCD Feynman rules

6.3 Simple example application of the QCD Feynman rules

6.4 BRST symmetry

6.5 Slavnov-Taylor identities


7 Renormalization of QCD

7.1 Divergences in scalar field theories

7.2 Divergences in Yang-Mills theory

7.3 Dimensional regularization refresher

7.4 One-loop renormalization of QCD

7.5 The one-loop QCD running coupling


8 Topological objects in field theory

8.1 The kinky sine-Gordon model

8.2 Two-dimensional vortex lines

8.3 Topological solutions in Yang-Mills

8.4 The instanton

8.5 The Potryagin index

8.6 Explicit solution for a q = 1 instanton

8.7 Quantum tunneling, θ-vacua, and symmetry breaking

8.8 Quantum Anomalies

8.9 An effective Lagrangian for the anomaly

8.10 Instantons and the chiral anomaly

8.11 Perturbation theory for the chiral anomaly 


Paperback ISBN: 9780750330152

Ebook ISBN: 9781643277073

DOI: 10.1088/2053-2571/ab3108

Publisher: Morgan & Claypool Publishers


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