Density behaviour related to Lévy processes

Density behaviour related to Lévy processes
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与 Lévy 过程相关的密度行为

DOI:
10.1090/tran/8268
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发表时间:
2019
影响因子:
1.3
通讯作者:
J. Małecki
J. Małecki
中科院分区:
数学1区
文献类型:
--
作者:
L. Chaumont;J. Małecki

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令 $p_t(x)$、$f_t(x)$ 和 $q_t^*(x)$ 为真实 Levy 过程在时间 $t$ 的密度、其运行上界以及下确界处反射偏移的入口定律。我们提供了当 $t$ 较小而 $x$ 较大时,$p_t(x)$、$f_t(x)$ 和 $q_t^*(x)$ 的渐近行为之间的关系。然后,对于较大的 $x$,将这些渐近行为与 Levy 测度的密度进行比较。我们特别表明,在温和条件下,如果 $p_t(x)$ 与 $t\nu(x)$ 相当,如 $t\rightarrow0$ 和 $x\rightarrow\infty$,那么 $f_t(x)$ 也是如此。
Let $p_t(x)$, $f_t(x)$ and $q_t^*(x)$ be the densities at time $t$ of a real Levy process, its running supremum and the entrance law of the reflected excursions at the infimum. We provide relationships between the asymptotic behaviour of $p_t(x)$, $f_t(x)$ and $q_t^*(x)$, when $t$ is small and $x$ is large. Then for large $x$, these asymptotic behaviours are compared to this of the density of the Levy measure. We show in particular that, under mild conditions, if $p_t(x)$ is comparable to $t\nu(x)$, as $t\rightarrow0$ and $x\rightarrow\infty$, then so is $f_t(x)$.