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CANCELLED - ICMT Seminar: "Stochastic Recruitment Leads to Symmetry-Breaking"

Event Type
Department of Physics
NEW LOCATION: 280 MRL, 104 S. Goodwin
Feb 17, 2014   12:00 pm  
Dr. Tommaso Biancalani, University of Illinois Urbana-Champaign
Originating Calendar
Physics - Institute for Condensed Matter Theory Seminar

When an ant colony is faced with two identical equidistant food sources, the foraging ants are found to concentrate more on one source than the other. Analogous symmetry-breaking behaviours have been reported in various population systems, (such as queueing or stock market trading) suggesting the existence of a simple universal mechanism. Past studies have neglected the effect of demographic noise and required rather complicated models to qualitatively reproduce this behaviour. I will show how including the effects of demographic noise leads to a radically different conclusion. The symmetry-breaking arises solely due to the process of recruitment and ceases to occur

for large population sizes. The latter fact provides a testable prediction for a real system.

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