Mind the gap
Apr, 20016 pages
Part of The exact renormalization group. Proceedings, 2nd Conference, Rome, Italy, September 18-22, 2000
Published in:
- Int.J.Mod.Phys.A 16 (2001) 2081-2088
Contribution to:
e-Print:
- hep-th/0104221 [hep-th]
Report number:
- CERN-TH-2001-013
Citations per year
Abstract:
We discuss an optimisation criterion for the exact renormalisation group based on the inverse effective propagator, which displays a gap. We show that a simple extremisation of the gap stabilises the flow, leading to better convergence of approximate solutions towards the physical theory. This improves the reliability of truncations, most relevant for any high precision computation. These ideas are closely linked to the removal of a spurious scheme dependence and a minimum sensitivity condition. The issue of predictive power and a link to the Polchinski RG are discussed as well. We illustrate our findings by computing critical exponents for the Ising universality class.- talk: Rome 2000/09/18
- gauge field theory: SU(3)
- renormalization group
- propagator
- gap: stability
- Ising model
- universality
- critical phenomena
References(14)
Figures(0)