Our understanding of the physical world was revolutionized in the twentieth century
the era of modern physics . This book, aimed at the very best students, extends the
coverage of the theoretical groundwork of today's physics presented in the previous
volume: Introduction to Modern Physics: Theoretical Foundations (Vol. I). Typically,
students have to wade through several courses to see many of these topics. The goal
is to give them some idea of where they are going, and how things fit together,
as they go along.

The present book focuses on the following topics: reformulation of quantum mechanics,
angular momentum, scattering theory, lagrangian field theory, symmetries, Feynman
rules, quantum electrodynamics, including higher-order contributions, path integrals,
and canonical transformations for quantum systems. Many problems are included that
enhance and extend the coverage. The book assumes a mastery of the material in Vol. I,
and the continued development of mathematical skills, including multivariable calculus
and linear algebra. Several appendices provide important details, and any additional
required mathematics. The reader should then find the text, together with the
appendices and problems, to be self-contained. The aim is to cover the framework of
modern theoretical physics in sufficient depth that things make sense to students,
and, when finished, the reader should have an elementary working knowledge in the
principal areas of theoretical physics of the twentieth century.

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