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2015 Triple and simultaneous collisions of competing Brownian particles
Andrey Sarantsev
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Electron. J. Probab. 20: 1-28 (2015). DOI: 10.1214/EJP.v20-3279


Consider a finite system of competing Brownian particles. They move as Brownian motions with drift and diffusion coefficients depending on their ranks. This includes the case of asymmetric collisions, when the local time of any collision is distributed unevenly between the two colliding particles, see Karatzas, Pal and Shkolnikov (2012). A triple collision occurs if three particles occupy the same site at a given moment. This is sometimes an undesirable phenomenon. Continuing the work of Ichiba, Karatzas and Shkolnikov (2013), we find necessary and sufficient condition for absense of triple collisions. We also prove sufficient conditions for absense of quadruple collisions, of quintuple collisions, and so on. Our method is reduction to reflected Brownian motion in the positive multidimesnional orthant hitting non-smooth parts of the boundary and, more generally, edges of the boundary of certain low dimension.


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Andrey Sarantsev. "Triple and simultaneous collisions of competing Brownian particles." Electron. J. Probab. 20 1 - 28, 2015.


Accepted: 19 March 2015; Published: 2015
First available in Project Euclid: 4 June 2016

zbMATH: 1321.60213
MathSciNet: MR3325099
Digital Object Identifier: 10.1214/EJP.v20-3279

Primary: 60K35
Secondary: 60H10, 60J65


Vol.20 • 2015
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