English

Intermittency fronts for space-time fractional stochastic partial differential equations in $(d+1)$ dimensions

Probability 2016-02-24 v1 Mathematical Physics Analysis of PDEs math.MP

Abstract

We consider time fractional stochastic heat type equation tβut(x)=ν(Δ)α/2ut(x)+It1β[σ(u)W(t,x)]\partial^\beta_tu_t(x)=-\nu(-\Delta)^{\alpha/2} u_t(x)+I^{1-\beta}_t[\sigma(u)\stackrel{\cdot}{W}(t,x)] in (d+1)(d+1) dimensions, where ν>0\nu>0, β(0,1)\beta\in (0,1), α(0,2]\alpha\in (0,2], d<min{2,β1}\ad<\min\{2,\beta^{-1}\}\a, tβ\partial^\beta_t is the Caputo fractional derivative, (Δ)α/2-(-\Delta)^{\alpha/2} is the generator of an isotropic stable process, W(t,x)\stackrel{\cdot}{W}(t,x) is space-time white noise, and σ:R\RRR\sigma:\R \to\RR{R} is Lipschitz continuous. Mijena and Nane proved in \cite{JebesaAndNane1} that : (i) absolute moments of the solutions of this equation grows exponentially; and (ii) the distances to the origin of the farthest high peaks of those moments grow exactly linearly with time. The last result was proved under the assumptions α=2\alpha=2 and d=1.d=1. In this paper we extend this result to the case α=2\alpha=2 and d{1,2,3}.d\in\{1,2,3\}.

Keywords

Cite

@article{arxiv.1602.07262,
  title  = {Intermittency fronts for space-time fractional stochastic partial differential equations in $(d+1)$ dimensions},
  author = {Sunday A. Asogwa and Erkan Nane},
  journal= {arXiv preprint arXiv:1602.07262},
  year   = {2016}
}

Comments

17 pages, submitted for publication. arXiv admin note: substantial text overlap with arXiv:1409.7468

R2 v1 2026-06-22T12:56:14.919Z