WebStack Exchange network consists of 181 Q&A our including Stack Overflows, the largest, most trusted online community for developers to learn, share its knowledge, and build their careers.. Visit Stack Exchange WebThis phenomenological theory is thus consistent with experimental evidence of a weak first-order transition (in three-dimensional systems). In real systems, the order parameter is slowly varying in space, and additional terms in the expansion are required, which involve gradients of the order parameter.

11 Perturbation Theory and Feynman Diagrams - University of …

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Problem Sheet 7: Interacting Quantum Field Theory:

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