TY - JOUR

T1 - Regularity and mass conservation for discrete coagulation-fragmentation equations with diffusion

AU - Cañizo, J. A.

AU - Desvillettes, L.

AU - Fellner, K.

PY - 2010/4/1

Y1 - 2010/4/1

N2 - We present a new a priori estimate for discrete coagulationâ€“fragmentation systems with size-dependent diffusion within a bounded, regular domain confined by homogeneous Neumann boundary conditions. Following from a duality argument, this a priori estimate provides a global L 2 bound on the mass density and was previously used, for instance, in the context of reactionâ€“diffusion equations. In this paper we demonstrate two lines of applications for such an estimate: On the one hand, it enables to simplify parts of the known existence theory and allows to show existence of solutions for generalised models involving collision-induced, quadratic fragmentation terms for which the previous existence theory seems difficult to apply. On the other hand and most prominently, it proves mass conservation (and thus the absence of gelation) for almost all the coagulation coefficients for which mass conservation is known to hold true in the space homogeneous case.

AB - We present a new a priori estimate for discrete coagulationâ€“fragmentation systems with size-dependent diffusion within a bounded, regular domain confined by homogeneous Neumann boundary conditions. Following from a duality argument, this a priori estimate provides a global L 2 bound on the mass density and was previously used, for instance, in the context of reactionâ€“diffusion equations. In this paper we demonstrate two lines of applications for such an estimate: On the one hand, it enables to simplify parts of the known existence theory and allows to show existence of solutions for generalised models involving collision-induced, quadratic fragmentation terms for which the previous existence theory seems difficult to apply. On the other hand and most prominently, it proves mass conservation (and thus the absence of gelation) for almost all the coagulation coefficients for which mass conservation is known to hold true in the space homogeneous case.

U2 - 10.1016/j.anihpc.2009.10.001

DO - 10.1016/j.anihpc.2009.10.001

M3 - Article

SN - 1873-1430

VL - 27

SP - 639

EP - 654

JO - l' Institut Henri Poincare. Annales (C). Analyse Non Lineaire

JF - l' Institut Henri Poincare. Annales (C). Analyse Non Lineaire

IS - 2

ER -