Equivalence of Local Potential Approximations

Details Equivalence of Local Potential Approximations Equivalence of Local Potential Approximations

2005-03-21

arxiv.org/abs/hep-th/0503161v3

JHEP 0507 (2005) 027

Physics

High Energy Physics

High Energy Physics - Theory

7 pages (improved statement of "central issue", 2 refs added)

Scientific paper

10.1088/1126-6708/2005/07/027

In recent papers it has been noted that the local potential approximation of the Legendre and Wilson-Polchinski flow equations give, within numerical error, identical results for a range of exponents and Wilson-Fisher fixed points in three dimensions, providing a certain ``optimised'' cutoff is used for the Legendre flow equation. Here we point out that this is a consequence of an exact map between the two equations, which is nothing other than the exact reduction of the functional map that exists between the two exact renormalization groups. We note also that the optimised cutoff does not allow a derivative expansion beyond second order.

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