2D anisotropic KPZ at stationarity: scaling, tightness and nontriviality

DOI10.1214/20-AOP1446zbMATH Open1457.60112arXiv1907.01530OpenAlexW3121378486MaRDI QIDQ2227711

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Publication date: 15 February 2021

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Abstract: In this work we focus on the two-dimensional anisotropic KPZ (aKPZ) equation, which is formally given by �egin{equation*}partial_t h =frac{

u}{2}Delta h + lambda((partial_1 h)^2 - (partial_2 h)^2) +

u^frac{1}{2}xi,end{equation*} where $xi$ denotes a noise which is white in both space and time, and $lambda$ and $u$ are positive constants. Due to the wild oscillations of the noise and the quadratic nonlinearity, the previous equation is classically ill-posed. It is not possible to linearise it via the Cole-Hopf transformation and the pathwise techniques for singular SPDEs (the theory of Regularity Structures by M. Hairer or the paracontrolled distributions approach of M. Gubinelli, P. Imkeller, N. Perkowski) are not applicable. In the present work, we consider a regularised version of aKPZ which preserves its invariant measure. We show that in order to have subsequential limits once the regularisation is removed, it is necessary to suitably renormalise $lambda$ and $u$. Moreover, we prove that, in the regime suggested by the (non-rigorous) renormalisation group computations of [D.E. Wolf, "Kinetic roughening of vicinal surfaces, Phys. Rev. Lett., 1991], i.e. $u$ constant and the coupling constant $lambda$ converging to $0$ as the inverse of the square root logarithm, any limit differs from the solution to the linear equation obtained by simply dropping the nonlinearity in aKPZ.

Full work available at URL: https://arxiv.org/abs/1907.01530

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