A non-Gaussian fixed point for phi(4) in 4-epsilon dimensions

Citation
D. Brydges et al., A non-Gaussian fixed point for phi(4) in 4-epsilon dimensions, COMM MATH P, 198(1), 1998, pp. 111-156
Citations number
21
Categorie Soggetti
Physics
Journal title
COMMUNICATIONS IN MATHEMATICAL PHYSICS
ISSN journal
00103616 → ACNP
Volume
198
Issue
1
Year of publication
1998
Pages
111 - 156
Database
ISI
SICI code
0010-3616(199811)198:1<111:ANFPFP>2.0.ZU;2-5
Abstract
We consider the phi(4) quantum field theory in four dimensions. The Gaussia n part of the measure is modified to simulate 4 - epsilon dimensions where epsilon is small and positive. We give a renormalization group analysis for the infrared behavior of the resulting model. We find that the Gaussian fi xed point is unstable but that there is a hyperbolic non-Gaussian fixed poi nt a distance O(epsilon) away. In a neighborhood of this fixed point we con struct the stable manifold.