Abstract
In this paper, we consider discrete growth–decay–fragmentation equations that describe the size distribution of clusters that can undergo splitting, growth and decay. The clusters can be for instance animal groups that can split but can also grow, or decrease in size due to birth or death of individuals in the group, or chemical particles where the growth and decay can be due to surface deposition or erosion. We prove that for a large class of such problems, the solution semigroup is analytic and compact and thus has the asynchronous exponential growth property; that is, the long-term behaviour of any solution is given by a scalar exponential function multiplied by a vector, called the stable population distribution, that is independent on the initial conditions.
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The research was partially funded by DST/NRF SARChI Chair in Mathematical Models and Methods in Biosciences and Bioengineering, Grant No. 8277, and NRF Ph.D. Grantholder Bursary, Grant No. 102275 (LOJ).
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Banasiak, J., Joel, L.O. & Shindin, S. Discrete growth–decay–fragmentation equation: well-posedness and long-term dynamics. J. Evol. Equ. 19, 771–802 (2019). https://doi.org/10.1007/s00028-019-00499-4
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DOI: https://doi.org/10.1007/s00028-019-00499-4
Keywords
- Discrete fragmentation
- Birth-and-death process
- \(C_0\)-Semigroups
- Long-term behaviour
- Asynchronous exponential growth
- Spectral gap
- Numerical simulations