What is subordanator?

Answer 1

A subordinator is a type of stochastic process that generalizes the concept of a random walk. It typically refers to a class of processes that are constructed by taking a time-changed version of a standard process, where the time change is governed by a subordinator—a non-decreasing Lévy process. Subordinators are often used in various fields, including finance and physics, to model phenomena that exhibit heavy tails or long-range dependence. Examples of subordinators include processes like the gamma process and the stable subordinator.