WIAS Preprint No. 165, (1995)

A continuous super-Brownian motion in a super-Brownian medium



Authors

  • Dawson, Donald A.
  • Fleischmann, Klaus

2010 Mathematics Subject Classification

  • 60J80 60J55 60G57

Keywords

  • catalytic reaction diffusion equation, catalyst process, random medium, catalytic medium, super-Brownian motion, superprocess, branching rate functional, measure-valued branching, critical branching, occupation time, jointly continuous occupation density, Hölder continuities, collision local time, persistence, super-Brownian medium

Abstract

A continuous super-Brownian motion X is constructed in which branching occurs only in the presence of catalysts which evolve themselves as a continuous super-Brownian motion ᵨ. More precisely, the collision local time L[W,ᵨ] (in the sense of Barlow et al. [BEP91]) of an underlying Brownian motion path W with the catalytic mass process ᵨ governs the branching (in the sense of Dynkin's additive functional approach). In the one-dimensional case, a new type of limit behavior is encountered: The total mass process converges to a limit without loss of expectation mass (persistence) and with a positive (finite) limiting variance, whereas starting with a Lebesgue measure ℓ, stochastic convergence to ℓ occurs.

Appeared in

  • J. Theoret. Probab., 10 (1997), pp. 213-276

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