Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2000-06-26
Nucl.Phys. B592 (2001) 512-562
Physics
Condensed Matter
Statistical Mechanics
38 pages, 7 figures
Scientific paper
10.1016/S0550-3213(00)00507-1
A continuous sequence of infinitesimal unitary transformations is used to diagonalize the quantum sine-Gordon model for \beta^2\in(2\pi,\infty). This approach can be understood as an extension of perturbative scaling theory since it links weak- to strong-coupling behavior in a systematic expansion: a small expansion parameter is identified and this parameter remains small throughout the entire flow unlike the diverging running coupling constant of perturbative scaling. Our approximation consists in neglecting higher orders in this small parameter. We find very accurate results for the single-particle/hole spectrum in the strong-coupling phase and can describe the full crossover from weak to strong-coupling. The integrable structure of the sine-Gordon model is not used in our approach. Our new method should be of interest for the investigation of nonintegrable perturbations and for other strong-coupling problems.
No associations
LandOfFree
Flow equation approach to the sine-Gordon model 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 Flow equation approach to the sine-Gordon model, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Flow equation approach to the sine-Gordon model will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-34352