Skeletons and Variation
نویسنده
چکیده
Well known from the sixties, the pressure of e.g. massless φ theory may be written as a series of 2PI-diagrams (skeletons) with the lines fully dressed. Varying the self–energy Π in this expression, it turns into a functional u [Y ] having a maximum in function space at Y = Π . There is also the Feynman–Jensen thermal variational principle v [S], a potentially non–perturbative tool. Here actions S are varied.
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