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Stochastic fluctuations and stability in birth-death population dynamics: two-component Langevin equation in path-integral formalism

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arXiv:2404.13314v1 Announce Type: new
Abstract: We discuss the stochastic process of creation and annihilation of particles, i.e., the $A^{n} \rightleftarrows B$ process in which $n$ particles $A$s and one particle $B$ are transformed to each other. Considering the case that the stochastic fluctuations are dependent on the numbers of $A$ and $B$, we apply the Langevin equation for the stochastic time-evolution of the numbers of $A$ and $B$. We analyze the Langevin equation in the path-integral formalism, and show that the new driving force is generated dynamically by the stochastic fluctuations. We present that the generated driving force leads to the nontrivial stable equilibrium state. This equilibrium state is regarded as the new state of order which is induced effectively by stochastic fluctuations. We also discuss that the formation of such equilibrium state requires at least two stochastic variables in the stochastic processes.

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