English

Central limit theorems for the derivatives of self-intersection local time for $d$-dimensional Brownian motion

Probability 2024-03-18 v1

Abstract

Let {Bt,t0}\{B_t,t\geq0\} be a d-dimensional Brownian motion. We prove that the approximation of the higher derivative of renormalized self-intersection local time 010s(pd,ϵ(k)(BsBr)E[pd,ϵ(k)(BsBr)])drds, \int_{0}^{1}\int_{0}^{s}\left(p^{(|k|)}_{d,\epsilon}(B_{s}-B_{r})-E[p^{(|k|)}_{d,\epsilon}(B_{s}-B_{r})]\right)drds, where the multiindex k=(k1,,kd)k=(k_{1},\cdots,k_{d}), pd,ϵ(k)(x1,x2,,xd):=x1k1x2k2 p_{d,\epsilon}^{(|k|)}(x_1,x_2,\cdots,x_d):=\partial^{k_1}_{x_1}\partial^{k_2}_{x_2} xdkdpd,ϵ(x1,x2,,xd)\cdots\partial^{k_d}_{x_d}p_{d,\epsilon}(x_1,x_2,\cdots,x_d) and pd,ϵ(x)=1(2πϵ)d/2ex22ϵ,xRdp_{d,\epsilon}(x)=\frac{1}{(2\pi\epsilon)^{d/2}}e^{-\frac{|x|^{2}}{2\epsilon}}, x\in\mathbb{R}^d, satisfies the central limit theorems when renormalized by (log1ϵ)1(\log\frac{1}{\epsilon})^{-1} in the case d=2d=2, k=1|k|=1 and by ϵd+k32\epsilon^{\frac{d+|k|-3}{2}} in the case d3d\geq 3, k1|k|\geq 1, which gives a complete answer to the conjecture of Markowsky [In S\'{e}minaire de Probabiliti\'{e}s \uppercase\expandafter{\romannumeral10\romannumeral50\romannumeral4} (2012) 141-148 Springer]. We as well prove that its m-th Wiener chaotic component satisfies the central limit theorems when renormalized by a multiplicative factor in different cases.

Keywords

Cite

@article{arxiv.2403.10483,
  title  = {Central limit theorems for the derivatives of self-intersection local time for $d$-dimensional Brownian motion},
  author = {Xiaoyan Xu and Xianye Yu},
  journal= {arXiv preprint arXiv:2403.10483},
  year   = {2024}
}