Eder, O.J., Lackner, T., & Posch, M. ORCID: https://orcid.org/0000-0001-8649-9129
(1985).
*Green’s-function solution for a special class of master equations.*
Physical Review A 31 (1) 366-377. 10.1103/PhysRevA.31.366.

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## Abstract

We consider a one-dimensional stochastic process described by a master equation and calculate the time-dependent distribution function. The time evolution of the system is given by the conditional probability h(x,t‖x0), where x and x0 are continuous variables. Assuming a quite general dependence of the transition probability WΩ(x→x’) on a parameter Ω, we show that the backward form of the master equation can be used to calculate arbitrary conditional averages 〈f(x)‖x0⟩t up to any given power in Ω−1. This general expansion procedure will be used to construct h(x,t‖x0) itself. We show that—introducing a new stochastic variable y—the conditional probability h(x,t‖x0) can be expanded into a series of Hermite functions. The coefficients of this expansion, bn(t), which depend on the expansion parameter Ω, can be uniquely determined via a recursion relation. We show that in the limit Ω→∞ all coefficients bn(t) vanish, except b0, which is time independent. In this limit a Gaussian distribution for the conditional probability is obtained, which is in agreement with the so-called linear noise approximation.

Item Type: | Article |
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Research Programs: | Acid Rain Program (ACI) |

Depositing User: | Romeo Molina |

Date Deposited: | 15 Apr 2016 11:33 |

Last Modified: | 27 Aug 2021 17:26 |

URI: | https://pure.iiasa.ac.at/12722 |

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