THE SCALING LIMIT OF THE INTERFACE OF THE CONTINUOUS-SPACE SYMBIOTIC BRANCHING MODEL

• 成果类型: Article
• 署名作者: Blath, Jochen; Hammer, Matthias; Ortgiese, Marcel
• 署名单位: Technical University of Berlin; University of Munster
• 刊物名称: ANNALS OF PROBABILITY
• ISSN/ISSBN: 0091-1798
• DOI: 10.1214/14-AOP989
• 发表日期: 2016
• 页码: 807-866
• 关键词: time behavior; uniqueness; plane

摘要

The continuous-space symbiotic branching model describes the evolution of two interacting populations that can reproduce locally only in the simultaneous presence of each other. If started with complementary Heaviside initial conditions, the interface where both populations coexist remains compact. Together with a diffusive scaling property, this suggests the presence of an interesting scaling limit. Indeed, in the present paper, we show weak convergence of the diffusively rescaled populations as measure-valued processes in the Skorokhod, respectively the Meyer-Zheng, topology (for suitable parameter ranges). The limit can be characterized as the unique solution to a martingale problem and satisfies a separation of types property. This provides an important step toward an understanding of the scaling limit for the interface. As a corollary, we obtain an estimate on the moments of the width of an approximate interface.