Mind the gap

Litim, Daniel F (2001) Mind the gap. International Journal of Modern Physics A, 16 (11). 2081 - 2087. ISSN 0217-751X

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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.

Item Type: Article
Additional Information: Talk given at 2nd Conference on Exact Renormalization Group, Rome, Italy, 18-22 Sep 2000.
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QC Physics
Depositing User: Daniel Litim
Date Deposited: 06 Feb 2012 18:39
Last Modified: 18 Jul 2012 08:42
URI: http://srodev.sussex.ac.uk/id/eprint/17589
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