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The renormalization group and the epsilon expansion

Обложка книги The renormalization group and the epsilon expansion

The renormalization group and the epsilon expansion

The modern formulation of the renormalization group is explained for both critical phenomena in classical statistical mechanics and quantum field theory. The expansion in e = 4 - d is explained [d is the dimension of space (statistical mechanics) or space- time (quantum field theory)]. The emphasis is on principles, not particular applications. Sections 1 - 8 provide a self-contained introduction at a fairly elementary level to the statistical mechanical theory. No background is required except for some prior experience with diagrams. In particular, a diagrammatic approximation to an exact renormalization group equation is presented in sections 4 and 5; sections 6-8 include the approximate rcnormalization group recursion formula and the Feynman graph method for calculating exponents. Sections 10-13 go deeper into renormalization group theory (section 9 presents a calculation of anomalous dimensions). The equivalence of quantum field theory and classical statistical mechanics near the critical point is established in section 10; sections 11-13 concern problems common to both subjects. Specific field theoretic references assume some background in quantum field theory. An exact renormalization group equation is presented in section 11; sections 12 and 13 concern fundamental topological questions.
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