## Electronic Journal of Probability

- Electron. J. Probab.
- Volume 15 (2010), paper no. 19, 605-635.

### A Historical Law of Large Numbers for the Marcus-Lushnikov Process

#### Abstract

The Marcus-Lushnikov process is a finite stochastic particle system, in which each particle is entirely characterized by its mass. Each pair of particles with masses $x$ and $y$ merges into a single particle at a given rate $K(x,y)$. Under certain assumptions, this process converges to the solution to the Smoluchowski coagulation equation, as the number of particles increases to infinity. The Marcus-Lushnikov process gives at each time the distribution of masses of the particles present in the system, but does not retain the history of formation of the particles. In this paper, we set up a historical analogue of the Marcus-Lushnikov process (built according to the rules of construction of the usual Markov-Lushnikov process) each time giving what we call the historical tree of a particle. The historical tree of a particle present in the Marcus-Lushnikov process at a given time t encodes information about the times and masses of the coagulation events that have formed that particle. We prove a law of large numbers for the empirical distribution of such historical trees. The limit is a natural measure on trees which is constructed from a solution to the Smoluchowski coagulation equation.

#### Article information

**Source**

Electron. J. Probab., Volume 15 (2010), paper no. 19, 605-635.

**Dates**

Accepted: 1 May 2010

First available in Project Euclid: 1 June 2016

**Permanent link to this document**

https://projecteuclid.org/euclid.ejp/1464819804

**Digital Object Identifier**

doi:10.1214/EJP.v15-767

**Mathematical Reviews number (MathSciNet)**

MR2639735

**Zentralblatt MATH identifier**

1225.60011

**Subjects**

Primary: 60B10: Convergence of probability measures

Secondary: 60J25: Continuous-time Markov processes on general state spaces 60B05: Probability measures on topological spaces 60F15: Strong theorems

**Keywords**

historical trees Marcus-Lushnikov process on trees limit measure on trees Smoluchowski coagulation equation tightness coupling

**Rights**

This work is licensed under aCreative Commons Attribution 3.0 License.

#### Citation

Jacquot, Stephanie. A Historical Law of Large Numbers for the Marcus-Lushnikov Process. Electron. J. Probab. 15 (2010), paper no. 19, 605--635. doi:10.1214/EJP.v15-767. https://projecteuclid.org/euclid.ejp/1464819804