Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2002-11-14
Physics
Condensed Matter
Statistical Mechanics
10 pages, 4 figures, submitted to Physica A
Scientific paper
10.1016/S0378-4371(03)00196-1
We investigate globally coupled stochastic three-state oscillators, which we consider as general models of stochastic excitable systems. We compare two situations:in the first case the transitions between the three states of each unit 1->2->3->1 are determined by Poissonian waiting time distributions. In the second case only transition 1->2 is Poissonian whereas the others are deterministic with a fixed delay. When coupled the second system shows coherent oscillations whereas the first remains in a stable stationary state. We show that the coherent oscillations are due to a Hopf-bifurcation in the dynamics of the occupation probabilities of the discrete states and discuss the bifurcation diagram.
Naundorf Bjoern
Prager Tobias
Schimansky-Geier Lutz
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