Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1996-12-11
Nucl.Phys. B495 (1997) 477-504
Physics
High Energy Physics
High Energy Physics - Theory
33 pages, 1 eps figure, 7 tables; TeX + harvmac; version to appear in Nucl. Phys. B
Scientific paper
10.1016/S0550-3213(97)00233-2
We show that non-perturbative fixed points of the exact renormalization group, their perturbations and corresponding massive field theories can all be determined directly in the continuum -- without using bare actions or any tuning procedure. As an example, we estimate the universal couplings of the non-perturbative three-dimensional one-component massive scalar field theory in the Ising model universality class, by using a derivative expansion (and no other approximation). These are compared to the recent results from other methods. At order derivative-squared approximation, the four-point coupling at zero momentum is better determined by other methods, but factoring this out appropriately, all our other results are in very close agreement with the most powerful of these methods. In addition we provide for the first time, estimates of the n-point couplings at zero momentum, with n=12,14, and the order momentum-squared parts with n=2 ... 10.
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