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arXiv 0706.1503math.PR
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无负跳的稳定Lévy过程的上确界律

The law of the supremum of a stable Lévy process with no negative jumps

Violetta Bernyk, Robert C. Dalang, Goran Peskir

摘要:

设$X=(X_t)_{t\ge0}$是一个稳定的Lévy过程,其指标为$α\in(1,2)$,没有负跳,并设$t>0$表示其运行上确界。证明了$S_t$的密度函数$f_t$可以刻画为第一类弱奇异Volterra积分方程的唯一解,或者等价地刻画为满足零点边界条件的一阶Riemann-Liouville分数阶微分方程的唯一解.这产生了$f_t$的显式级数表示。回想$S_t$和$X$第一次进入$[x,\infty)$的时间$τ_x$之间的熟悉关系,这进一步转化为$τ_x$的密度函数的显式级数表示。

英文摘要:

Let $X=(X_t)_{t\ge0}$ be a stable Lévy process of index $α\in(1,2)$ with no negative jumps and let $S_t=\sup_{0\le s\le t}X_s$ denote its running supremum for $t>0$. We show that the density function $f_t$ of $S_t$ can be characterized as the unique solution to a weakly singular Volterra integral equation of the first kind or, equivalently, as the unique solution to a first-order Riemann--Liouville fractional differential equation satisfying a boundary condition at zero. This yields an explicit series representation for $f_t$. Recalling the familiar relation between $S_t$ and the first entry time $τ_x$ of $X$ into $[x,\infty)$, this further translates into an explicit series representation for the density function of $τ_x$.

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