Dynamical Adjustment of Propagators in Renormalization Group Flows
Abstract
A class of continuous renormalization group flows with a dynamical adjustment of the propagator is introduced and studied theoretically for fermionic and bosonic quantum field theories. The adjustment allows to include self--energy effects nontrivially in the denominator of the propagator and to adapt the scale decomposition to a moving singularity, and hence to define flows of Fermi surfaces in a natural way. These flows require no counterterms, but the counterterms used in earlier treatments can be constructed using them. The influence of propagator adjustment on the strong--coupling behaviour of flows is examined for a simple example, and some conclusions about the strong coupling behaviour of renormalization group flows are drawn.
Cite
@article{arxiv.cond-mat/0607289,
title = {Dynamical Adjustment of Propagators in Renormalization Group Flows},
author = {Manfred Salmhofer},
journal= {arXiv preprint arXiv:cond-mat/0607289},
year = {2009}
}
Comments
LaTeX, 54 pages, 3 postscript figures