Skeletons and Variation
High Energy Physics - Phenomenology
2007-05-23 v3
Abstract
Well known from the sixties, the pressure of e.g. massless phi-four theory may be written as a series of 2PI-diagrams (skeletons) with the lines fully dressed. Varying the self-energy Pi in this expression, it turns into a functional U[Y] having a maximum in function space at Y=Pi. There is also the Feynman-Jensen thermal variational principle V[S], a potentially non-perturbative tool. Here actions S are varied. It is shown, through a few formal but exact steps, that the functional U is covered by V. The corresponding special subset of trial actions is made explicit.
Cite
@article{arxiv.hep-ph/9808339,
title = {Skeletons and Variation},
author = {Hermann Schulz},
journal= {arXiv preprint arXiv:hep-ph/9808339},
year = {2007}
}
Comments
4 pages RevTeX; talk at the 5th Thermal Field Theory Workshop 1998 at Regensburg, Germany, August 10-14; text around (9), (10) improved