Applications of improved duality lemmas to the discrete coagulation-fragmentation equations with diffusion

TL;DR

This paper explores how improved duality lemmas can be applied to discrete coagulation-fragmentation equations with diffusion, showing that strong fragmentation prevents gelation and enhances solution regularity.

Contribution

It introduces the use of duality lemmas in the discrete setting to analyze coagulation-fragmentation equations with diffusion, demonstrating the prevention of gelation by strong fragmentation.

Findings

Strong fragmentation prevents gelation even with superlinear coagulation

Superlinear moments are created and propagated under certain conditions

Regularity results are extended to models with strong fragmentation

Abstract

In this paper, we investigate the use of so called "duality lemmas" to study the system of discrete coagulation-fragmentation equations with diffusion. When the fragmentation is strong enough with respect to the coagulation, we show that we have creation and propagation of superlinear moments. In particular this implies that strong enough fragmentation can prevent gelation even for superlinear coagulation, a statement which was only known up to now in the homogeneous setting. We also use this control of superlinear moments to extend a recent result about the regularity of the solutions in the pure coagulation case, to strong fragmentation models.