MIND THE GAP
- LITIM, DANIEL F. Theory Division, CERN, CH-1211 Geneva 23, Switzerland
- 2012-1-25
Published in:
- International Journal of Modern Physics A. - World Scientific Pub Co Pte Lt. - 2001, vol. 16, no. 11, p. 2081-2087
English
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.
- Language
-
- English
- Open access status
- green
- Identifiers
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- DOI 10.1142/s0217751x01004748
- ISSN 0217-751X
- Persistent URL
- https://sonar.ch/global/documents/260250
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