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SPECIAL ISSUE: Proceedings of the Second Conference on the Exact Renormalization Group; Editors: Stefano Arnone, Yuri A. Kubyshin, Tim R. Morris and Kensuke YoshidaNo Access

MIND THE GAP

    https://doi.org/10.1142/S0217751X01004748Cited by:139 (Source: Crossref)

    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.

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