Non-Equilibrium Statistical Physics of Currents in Queuing Networks
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Author(s)
Chernyak, Vladimir Y.
Chertkov, Michael
Goldberg, David A.
Turitsyn, Konstantin
Date Issued
July 2010
Journal
Journal of Statistical Physics
Publisher
Springer Netherlands
Citation
Chernyak, Vladimir Y. et al. “Non-Equilibrium Statistical Physics of Currents in Queuing Networks.” Journal of Statistical Physics 140.5 (2010): 819-845.
Version
Author's final manuscript
Abstract
We consider a stable open queuing network as a steady non-equilibrium system of interacting particles. The network is completely specified by its underlying graphical structure, type of interaction at each node, and the Markovian transition rates between nodes. For such systems, we ask the question “What is the most likely way for large currents to accumulate over time in a network ?”, where time is large compared to the system correlation time scale. We identify two interesting regimes. In the first regime, in which the accumulation of currents over time exceeds the expected value by a small to moderate amount (moderate large deviation), we find that the large-deviation distribution of currents is universal (independent of the interaction details), and there is no long-time and averaged over time accumulation of particles (condensation) at any nodes. In the second regime, in which the accumulation of currents over time exceeds the expected value by a large amount (severe large deviation), we find that the large-deviation current distribution is sensitive to interaction details, and there is a long-time accumulation of particles (condensation) at some nodes. The transition between the two regimes can be described as a dynamical second order phase transition. We illustrate these ideas using the simple, yet non-trivial, example of a single node with feedback.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Massachusetts Institute of Technology. Operations Research Center
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Creative Commons Attribution-Noncommercial-Share Alike 3.0
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DOI of Published Version
https://doi.org/10.1007/s10955-010-0018-5
