arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1803.04863cond-mat.stat-mech
收藏

平坦Kardar-Parisi-Zhang界面的精确短时高度分布

Exact short-time height distribution for the flat Kardar-Parisi-Zhang interface

Naftali R. Smith, Baruch Meerson

摘要:

在平坦初始条件下,我们确定了1+1 Kardar-Parisi-Zhang(KPZ)界面单点高度$H=h(x=0,t)$的精确短时分布$-\ln \mathcal{P}_{\text{f}}\left(H,t\right)= S_{\text{f}} \left(H\right)/\sqrt{t}$.这是通过结合(i)最佳波动方法,(ii)1+1维KPZ方程的时间反演对称性,和(iii)最近确定的精确的短时高度分布$-\ln \mathcal{P}_{\text{st}}\left(H,t\right)= S_{\text{st}} \left(H\right)/\sqrt{t}$为\emph{stationary}初始条件。在研究后者的大偏差函数$S_{\text{st}} \left(H\right)$时,遇到两个分支:解析和非解析。分析分支是非物理的超过一个临界值的$H$的二阶动态相变发生。在这里,我们表明,值得注意的是,它是$S_{\text{st}} \left(H\right)$的分析分支,它确定了大偏差函数$S_{\text{f}} \left(H\right)$的平坦接口通过一个简单的映射$S_{\text{f}}\left(H\right)=2^{-3/2}S_{\text{st}}\left(2H\right)$。

英文摘要:

We determine the exact short-time distribution $-\ln \mathcal{P}_{\text{f}}\left(H,t\right)= S_{\text{f}} \left(H\right)/\sqrt{t}$ of the one-point height $H=h(x=0,t)$ of an evolving 1+1 Kardar-Parisi-Zhang (KPZ) interface for flat initial condition. This is achieved by combining (i) the optimal fluctuation method, (ii) a time-reversal symmetry of the KPZ equation in 1+1 dimension, and (iii) the recently determined exact short-time height distribution $-\ln \mathcal{P}_{\text{st}}\left(H,t\right)= S_{\text{st}} \left(H\right)/\sqrt{t}$ for \emph{stationary} initial condition. In studying the large-deviation function $S_{\text{st}} \left(H\right)$ of the latter, one encounters two branches: an analytic and a non-analytic. The analytic branch is non-physical beyond a critical value of $H$ where a second-order dynamical phase transition occurs. Here we show that, remarkably, it is the analytic branch of $S_{\text{st}} \left(H\right)$ which determines the large-deviation function $S_{\text{f}} \left(H\right)$ of the flat interface via a simple mapping $S_{\text{f}}\left(H\right)=2^{-3/2}S_{\text{st}}\left(2H\right)$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑