The second edition of this textbook presents the fundamental mathematical knowledge and skills needed for courses on modern theoretical physics, such as those on quantum mechanics, classical and quantum field theory, and related areas. The authors stress that learning mathematical physics is not a passive process and include numerous detailed proofs, examples, and over 200 exercises, as well as hints linking mathematical concepts and results to the relevant physical concepts and theories. All of the material from the first edition has been updated, and five new chapters have been added on such topics as distributions, Hilbert space operators, and variational methods.
The text is divided into three parts:
– Part I: A brief introduction to (Schwartz) distribution theory. Elements from the theories of ultra distributions and (Fourier) hyperfunctions are given in addition to some more profound results for Schwartz distributions, thus providing a relatively comprehensive introduction to the theory of generalized functions. Basic properties and methods for distributions are developed with applications to constant coefficient ODEs and PDEs. Â The relation between distributions and holomorphic functions and the basic properties of Sobolev spaces are considered.
– Part II: Fundamental facts about Hilbert spaces. The basic theory of linear (bounded and unbounded) operators in Hilbert spaces and special classes of linear operators – compact, Hilbert-Schmidt, trace class, and Schrödinger operators, as needed in quantum physics and quantum information theory – are explored. This section also contains a detailed spectral analysis of all major classes of linear operators, including the completeness of generalized eigenfunctions and of (ultimately) positive mappings, in particular quantum operations.
– Part III: Direct methods of calculating variations and their applications to boundary- and eigenvalue-problems for linear and nonlinear partial differential operators. Â The authors conclude with a discussion of the Hohenberg-Kohn variational principle.
The appendices contain proofs of more general and profound results, including completions, basic facts about metrizable Hausdorff locally convex topological vector spaces, Baire’s fundamental results and their main consequences, and bilinear functionals.
Mathematical Methods in Physics is aimed at a broad community of graduate students in mathematics, mathematical physics, quantum information theory, physics, and engineering, and researchers in these disciplines. Expanded content and relevant updates will make this new edition a valuable resource for those working in these disciplines.
