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arXiv 2005.05453math.PRmath.AP
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$Φ^4_3$的弱普适性:多项式势和一般光滑机制

Weak universality of $Φ^4_3$: polynomial potential and general smoothing mechanism

Dirk Erhard, Weijun Xu

摘要:

考虑三维环面上一类随机反应扩散方程。在弱非线性区域中,非线性是奇多项式,平滑机制是拉普拉斯算子的非常一般的高阶扰动。随机性是没有规则化的时空白噪声。我们发现,这些过程收敛到动态$Φ^4_3 (λ)$模型,其中的耦合常数$λ$有一个明确的表达式,涉及非平凡的平滑机制和非线性之间的所有细节的相互作用。

英文摘要:

We consider a class of stochastic reaction-diffusion equations on the three dimensional torus. The non-linearities are odd polynomials in the weakly non-linear regime, and the smoothing mechanisms are very general higher order perturbations of the Laplacian. The randomness is the space-time white noise without regularisation. We show that these processes converge to the dynamical $Φ^4_3 (λ)$ model, where the coupling constant $λ$ has an explicit expression involving non-trivial interactions between all details of the smoothing mechanism and the non-linearity.

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