Critical exponents of a three dimensional O(4) spin model

Abstract

By Monte Carlo simulation we study the critical exponents governing the transition of the three-dimensional classical O(4) Heisenberg model, which is considered to be in the same universality class as the finite-temperature QCD with massless two flavors. We use the single cluster algorithm and the histogram reweighting technique to obtain observables at the critical temperature. After estimating an accurate value of the inverse critical temperature $\Kc=0.9360(1)$, we make non-perturbative estimates for various critical exponents by finite-size scaling analysis. They are in excellent agreement with those obtained with the $4-\epsilon$ expansion method with errors reduced to about halves of them.

25 pages with 8 PS figures, LaTeX, UTHEP-284

References in corpus (2)

• Susceptibilities, the Specific Heat and a Cumulant in Two-Flavour QCD
• Scaling of Pseudo-Critical Couplings in Two-Flavour QCD

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