Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-09-30
J. Phys. A: Math. Theor. 44 (2011) 495004
Physics
Condensed Matter
Strongly Correlated Electrons
13 pages; updated and extended version
Scientific paper
I discuss functional renormalization group (fRG) schemes, which allow for non-perturbative treatment of the self-energy effects and do not rely on the one-particle irreducible functional. In particular, I consider Polchinski or Wick-ordered schemes with amputation of full (instead of bare) Green functions, as well as more general schemes, and eastablish their relation to the `dynamical adjustment propagator' scheme by M. Salmhofer [Ann. der Phys. 16, 171 (2007)]. While in the Polchinski scheme the amputation of full (instead of bare) Green functions improves treatment of the self-energy effects, the structure of the corresponding equations is not suitable to treat strong-coupling problems; it is not also evident, how the mean-field (MF) solution of these problems is recovered in this scheme. For Wick ordered scheme, excluding fully or partly tadpole diagrams one can obtain forms of fRG hierarchy, which are suitable to treat strong-coupling problems. In particular, I emphasize usefullness of the schemes, which are local in cutoff parameter, and compare them to the one-particle irreducible approach.
No associations
LandOfFree
Self-energy effects in the Polchinski and Wick-ordered renormalization-group approaches does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Self-energy effects in the Polchinski and Wick-ordered renormalization-group approaches, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Self-energy effects in the Polchinski and Wick-ordered renormalization-group approaches will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-242569