An invariance principle for branching diffusions in bounded domains

Powell, Ellen

Abstract

We study branching diffusions in a bounded domain D of Rd in which particles are killed upon hitting the boundary ∂D . It is known that any such process undergoes a phase transition when the branching rate β exceeds a critical value: a multiple of the first eigenvalue of the generator of the diffusion. We investigate the system at criticality and show that the associated genealogical tree, when the process is conditioned to survive for a long time, converges to Aldous’ Continuum Random Tree under appropriate rescaling. The result holds under only a mild assumption on the domain, and is valid for all branching mechanisms with finite variance, and a general class of diffusions.

Citation

Powell, E. (2019). An invariance principle for branching diffusions in bounded domains. Probability Theory and Related Fields, 173(3-4), 999-1062. https://doi.org/10.1007/s00440-018-0847-8

• Journal Article Type: Article
• Acceptance Date: Apr 16, 2018
• Online Publication Date: Apr 27, 2018
• Publication Date: Apr 1, 2019
• Deposit Date: Sep 28, 2019
• Publicly Available Date: Sep 22, 2021
• Journal: Probability Theory and Related Fields
• Print ISSN: 0178-8051
• Electronic ISSN: 1432-2064
• Publisher: Springer
• Peer Reviewed: Peer Reviewed
• Volume: 173
• Issue: 3-4
• Pages: 999-1062
• DOI: https://doi.org/10.1007/s00440-018-0847-8