# Modeling flocks and prices: Jumping particles with an attractive interaction

## Author(s): Balázs, M; Rácz, Miklos Z; Tóth, B

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 Abstract: We introduce and investigate a new model of a finite number of particles jumping forward on the real line. The jump lengths are independent of everything, but the jump rate of each particle depends on the relative position of the particle compared to the center of mass of the system. The rates are higher for those left behind, and lower for those ahead of the center of mass, providing an attractive interaction keeping the particles together. We prove that in the fluid limit, as the number of particles goes to infinity, the evolution of the system is described by a mean field equation that exhibits traveling wave solutions. A connection to extreme value statistics is also provided. © Association des Publications de l'Institut Henri Poincaré, 2014. Publication Date: 1-Jan-2014 Citation: Balázs, M, Rácz, MZ, Tóth, B. (2014). Modeling flocks and prices: Jumping particles with an attractive interaction. Annales de l'institut Henri Poincare (B) Probability and Statistics, 50 (2), 425 - 454. doi:10.1214/12-AIHP512 DOI: doi:10.1214/12-AIHP512 ISSN: 0246-0203 Pages: 425 - 454 Type of Material: Journal Article Journal/Proceeding Title: Annales de l'institut Henri Poincare (B) Probability and Statistics Version: Author's manuscript