Cubic fixed point in three dimensions: Monte Carlo simulations of the ${\varphi }^4$ model on the lattice

Abstract

We study the cubic fixed point for $N=3$ and $4$ by using finite size scaling applied to data obtained from Monte Carlo simulations of the $N$-component ${\varphi }^4$ model on the simple cubic lattice. We generalize the idea of improved models to a two-parameter family of models. The two-parameter space is scanned for the point, where the amplitudes of the two leading corrections to scaling vanish. To this end, a dimensionless quantity is introduced that monitors the breaking of the $O(N)$-invariance. For $N=4$, we determine the correction exponents ${\omega }_1=0.763(24)$ and ${\omega }_2=0.082(5)$. In the case of $N=3$, we obtain $Y_4=0.0142(6)$ for the RG-exponent of the cubic perturbation at the $O(3)$-invariant fixed point, while the correction exponent ${\omega }_2=0.0133(8)$ at the cubic fixed point. Simulations close to the improved point result in the estimates $\nu =0.7202(7)$ and $\eta =0.0371(2)$ of the critical exponents of the cubic fixed point for $N=4$. For $N=3$, at the cubic fixed point, the $O(3)$-symmetry is only mildly broken and the critical exponents differ only by little from those of the $O(3)$-invariant fixed point. We find $-0.00001⪅{\eta }_{cubic}-{\eta }_{O(3)}⪅0.00007$ and ${\nu }_{cubic}-{\nu }_{O(3)}=-0.00061(10)$.

arXiv commentRevised version: various typos corrected, typo in eq. (9) corrected; nonsense part of eq. 80 removed; Sections VII A 3, B, C, D are affected by a sign error in the "improvement" by adding $c_2{U}_C^2+c_3{U}_C^3$ to dimensionless quantities. See remarks added at the beginning of these sections. Final results for the cubic fixed point are virtually uneffected

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