Analytical approximation schemes for solving exact renormalization group equations. II Conformal mappings

Details Analytical approximation schemes for solving exact renormalization group equations. II Conformal mappings Analytical approximation schemes for solving exact renormalization group equations. II Conformal mappings

2008-02-14

arxiv.org/abs/0802.1970v2

Nucl.Phys.B801:296-315,2008

Physics

High Energy Physics

High Energy Physics - Theory

Final version to appear in Nucl. Phys. B. 1 reference added

Scientific paper

10.1016/j.nuclphysb.2008.02.021

We present a new efficient analytical approximation scheme to two-point boundary value problems of ordinary differential equations (ODEs) adapted to the study of the derivative expansion of the exact renormalization group equations. It is based on a compactification of the complex plane of the independent variable using a mapping of an angular sector onto a unit disc. We explicitly treat, for the scalar field, the local potential approximations of the Wegner-Houghton equation in the dimension $d=3$ and of the Wilson-Polchinski equation for some values of $d\in ] 2,3] $. We then consider, for $d=3$, the coupled ODEs obtained by Morris at the second order of the derivative expansion. In both cases the fixed points and the eigenvalues attached to them are estimated. Comparisons of the results obtained are made with the shooting method and with the other analytical methods available. The best accuracy is reached with our new method which presents also the advantage of being very fast. Thus, it is well adapted to the study of more complicated systems of equations.

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