Critical exponents for 3D O(n)-symmetric model with n > 3

Details Critical exponents for 3D O(n)-symmetric model with n > 3 Critical exponents for 3D O(n)-symmetric model with n > 3

1998-03-31

arxiv.org/abs/hep-th/9803264v1

Phys.Rev. E51 (1995) 1894-1898

Physics

High Energy Physics

High Energy Physics - Theory

10 pages, TeX, no figures

Scientific paper

10.1103/PhysRevE.51.1894

Critical exponents for the 3D O(n)-symmetric model with n > 3 are estimated on the base of six-loop renormalization-group (RG) expansions. A simple Pade-Borel technique is used for the resummation of the RG series and the Pade approximants [L/1] are shown to give rather good numerical results for all calculated quantities. For large n, the fixed point location g_c and the critical exponents are also determined directly from six-loop expansions without addressing the resummation procedure. An analysis of the numbers obtained shows that resummation becomes unnecessary when n exceeds 28 provided an accuracy of about 0.01 is adopted as satisfactory for g_c and critical exponents. Further, results of the calculations performed are used to estimate the numerical accuracy of the 1/n-expansion. The same value n = 28 is shown to play the role of the lower boundary of the domain where this approximation provides high-precision estimates for the critical exponents.

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