## Electronic Journal of Probability

### On Dirichlet eigenvectors for neutral two-dimensional Markov chains

#### Abstract

We consider a general class of discrete, two-dimensional Markov chains modeling the dynamics of a population with two types, without mutation or immigration, and neutral in the sense that type has no influence on each individual's birth or death parameters. We prove that all the eigenvectors of the corresponding transition matrix or infinitesimal generator $\Pi$ can be expressed as the product of universal'' polynomials of two variables, depending on each type's size but not on the specific transitions of the dynamics, and functions depending only on the total population size. These eigenvectors appear to be Dirichlet eigenvectors for $\Pi$ on the complement of triangular subdomains, and as a consequence the corresponding eigenvalues are ordered in a specific way. As an application, we study the quasistationary behavior of finite, nearly neutral, two-dimensional Markov chains, absorbed in the sense that $0$ is an absorbing state for each component of the process.

#### Article information

Source
Electron. J. Probab., Volume 17 (2012), paper no. 63, 41 pp.

Dates
Accepted: 18 August 2012
First available in Project Euclid: 4 June 2016

https://projecteuclid.org/euclid.ejp/1465062385

Digital Object Identifier
doi:10.1214/EJP.v17-1830

Mathematical Reviews number (MathSciNet)
MR2968670

Zentralblatt MATH identifier
1259.60078

Rights

#### Citation

Champagnat, Nicolas; Diaconis, Persi; Miclo, Laurent. On Dirichlet eigenvectors for neutral two-dimensional Markov chains. Electron. J. Probab. 17 (2012), paper no. 63, 41 pp. doi:10.1214/EJP.v17-1830. https://projecteuclid.org/euclid.ejp/1465062385

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