Mathematical Theory of Exchange-driven Growth

Abstract

Exchange-driven growth is a process in which pairs of clusters interact and exchange a single unit of mass. The rate of exchange is given by an interaction kernel $K(j,k)$ which depends on the masses of the two interacting clusters. In this paper we establish the fundamental mathematical properties of the mean field kinetic equations of this process for the first time. We find two different classes of behaviour depending on whether $K(j,k)$ is symmetric or not. For the non-symmetric case, we prove global existence and uniqueness of solutions for kernels satisfying $K(j,k)\le Cjk$. This result is optimal in the sense that we show for a large class of initial conditions with kernels satisfying $K(j,k)\ge C{j}^{\beta }$ ($\beta >1)$ the solutions cannot exist. On the other hand, for symmetric kernels, we prove global existence of solutions for $K(j,k)\le C(j^{\mu }{k}^{\nu }+j^{\nu }{k}^{\mu })$ ($\mu ,\nu \le 2,$ $\mu +\nu \le 3),$ while existence is lost for $K(j,k)\ge C{j}^{\beta }$ ($\beta >2).$ In the intermediate regime $3<\mu +\nu \le 4,$ we can only show local existence. We conjecture that the intermediate regime exhibits finite-time gelation in accordance with the heuristic results obtained for particular kernels.

arXiv commentMistakes in the uniqueness proofs are fixed. Some typos are corrected. Some references are added

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Cited by in corpus (4)

• Derivation of mean-field equations for stochastic particle systems
• The exchange-driven growth model: basic properties and longtime behavior
• Self-similar behavior of the exchange-driven growth model with product kernel
• The role of zero-clusters in exchange-driven growth with and without input