01618nam a2200205Ia 4500 CTU_209995 210402s9999 xx 000 0 und d 63.11 530.12 K64 Kleinert, Hagen Critical properties of [phi] 4-theories Hagen Kleinert, Verena Schulte-Frohlinde River Edge, NJ World Scientific 2001 This book explains in detail how to perform perturbation expansions in quantum field theory to high orders, and how to extract the critical properties of the theory from the resulting divergent power series. These properties are calculated for various second-order phase transitions of three-dimensional systems with high accuracy, in particular the critical exponents observable in experiments close to the phase transition.Beginning with an introduction to critical phenomena, this book develops the functional-integral description of quantum field theories, their perturbation expansions, and a method for finding recursively all Feynman diagrams to any order in the coupling strength. Algebraic computer programs are supplied on accompanying World Wide Web pages. The diagrams correspond to integrals in momentum space. Perturbation (Quantum dynamics),Phase transformations (Statistical physics),Quantum field theory,Nhiễu loạn (động lực học lượng tử),Biến đổi pha (thống kê vật lý),Lý thuyết trường lượng tử. Qhieu Trung tâm Học liệu Trường Đại học Cần Thơ