Renormalization Group

By: Giuseppe Benfatto, Giovanni Gallavotti

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Paperback | 10 October 1995

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Scaling and self-similarity ideas and methods in theoretical physics have, in the last twenty-five years, coalesced into renormalization-group methods. This book analyzes, from a single perspective, some of the most important applications: the critical-point theory in classical statistical mechanics, the scalar quantum field theories in two and three space-time dimensions, and Tomonaga''s theory of the ground state of one-dimensional Fermi systems.

The dimension dependence is discussed together with the related existence of anomalies (in Tomonaga''s theory and in 4 -e dimensions for the critical point). The theory of Bose condensation at zero temperature in three space dimensions is also considered. Attention is focused on results that can in principle be formally established from a mathematical point of view. The 4 -e dimensions theory, Bose condensation, as well as a few other statements are exceptions to this rule, because no complete treatment is yet available. However, the truly mathematical details are intentionally omitted and only referred to. This is done with the purpose of stressing the unifying conceptual structure rather than the technical differences or subtleties.

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Preface	p. vii
Introduction	p. 3
Problems Equivalent to the Analysis of Suitable Functional Integrals: Critical Point and Field Theory	p. 5
Other Functional Integrals: Fermi Sphere and Bose Condensation	p. 12
Effective Potentials and Schwinger Functions	p. 19
Multiscale Decomposition of Propagators and Fields: Running Effective Potentials	p. 22
Renormalization Group: Relevant and Irrelevant Components of the Effective Potentials	p. 27
Asymptotic Freedom: Upper Critical Dimension	p. 34
Beyond the Linear Approximations: The Beta Function and Perturbation Theory	p. 38
The Beta Function as a Dynamical System: Asymptotic Freedom of Marginal Theories	p. 52
Anomalous Dimension	p. 56
The Fermi Liquid and the Luttinger Model	p. 66
The Generic Critical Point for d = 3, [gamma] = 0: The [varepsilon]-Expansion	p. 70
Bose Condensation: Reformulation	p. 75
Bose Condensation: Effective Potentials	p. 81
The Beta Function for the Bose Condensation	p. 87
A Brief Historical Note	p. 96
Bibliographical Notes	p. 100
The Free Fermion Propagator	p. 104
Grassmannian Integration	p. 106
Trees and Feynman Graphs	p. 111
Schwinger Functions and Anomalous Dimension	p. 120
Propagators for the Bose Gas	p. 124
The Beta Function for the Bose Gas	p. 126
References	p. 135
Subject Index	p. 141
Citation Index	p. 143
Table of Contents provided by Syndetics. All Rights Reserved.

Renormalization Group

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