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, presents the foundations and frontiers of
today's physics. It focuses on the following topics: quantum mechanics;
applications in atomic, nuclear, particle, and condensed-matter physics;
special relativity; relativistic quantum mechanics, including the Dirac
equation and Feynman diagrams; quantum fields; and general relativity.
The aim is to cover these topics in sufficient depth such that things
"make sense'' to students and they can achieve an elementary working
knowledge of them. Many problems are included, a great number of which
take dedicated readers just as far as they want to go in modern physics.
Although the book is designed so that one can, in principle, read and
follow the text without doing any of the problems, the reader is urged
to attempt as many of them as possible. Several appendices help bring
the reader up to speed on any additional required mathematics. With very
few exceptions, the reader should then find the text, together with the
appendices and problems, to be self-contained.