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| DOI | 10.1103/PHYSREVE.89.052143 | ||||
| Año | 2014 | ||||
| Tipo | artículo de investigación |
Citas Totales
Autores Afiliación Chile
Instituciones Chile
% Participación
Internacional
Autores
Afiliación Extranjera
Instituciones
Extranjeras
Infinite arrays of coupled two-state stochastic oscillators exhibit well-defined steady states. We study the fluctuations that occur when the number N of oscillators in the array is finite. We choose a particular form of global coupling that in the infinite array leads to a pitchfork bifurcation from a monostable to a bistable steady state, the latter with two equally probable stationary states. The control parameter for this bifurcation is the coupling strength. In finite arrays these states become metastable: The fluctuations lead to distributions around the most probable states, with one maximum in the monostable regime and two maxima in the bistable regime. In the latter regime, the fluctuations lead to transitions between the two peak regions of the distribution. Also, we find that the fluctuations break the symmetry in the bimodal regime, that is, one metastable state becomes more probable than the other, increasingly so with increasing array size. To arrive at these results, we start from microscopic dynamical evolution equations from which we derive a Langevin equation that exhibits an interesting multiplicative noise structure. We also present a master equation description of the dynamics. Both of these equations lead to the same Fokker-Planck equation, the master equation via a 1/N expansion and the Langevin equation via standard methods of Ito calculus for multiplicative noise. From the Fokker-Planck equation we obtain an effective potential that reflects the transition from the monomodal to the bimodal distribution as a function of a control parameter. We present a variety of numerical and analytic results that illustrate the strong effects of the fluctuations. We also show that the limits N -> infinity and t -> infinity(t is the time) do not commute. In fact, the two orders of implementation lead to drastically different results.
| Ord. | Autor | Género | Institución - País |
|---|---|---|---|
| 1 | Dias Pinto, Italo'Ivo Lima | - |
Univ Fed Paraiba - Brasil
Universidade Federal da Paraíba - Brasil |
| 1 | Pinto, Italo'Ivo Lima Dias | - |
Universidade Federal da Paraíba - Brasil
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| 2 | ESCAFF-DIXON, DANIEL ELIAS | Hombre |
Universidad de Los Andes, Chile - Chile
|
| 3 | Harbola, Upendra | - |
Indian Inst Sci - India
Indian Institute of Science, Bengaluru - India Indian Institute of Science - India |
| 4 | Rosas, Alexandre | Hombre |
Univ Fed Paraiba - Brasil
Universidade Federal da Paraíba - Brasil |
| 5 | Lindenberg, Katja | Mujer |
Univ Calif San Diego - Estados Unidos
BioCircuits Institute - Estados Unidos |
| Fuente |
|---|
| FONDECYT |
| CAPES |
| National Science Foundation |
| CNPq |
| NSF |
| FAI-Puente (Universidad de los Andes) |
| CAPES/Nanobiotec |
| Indian Institute of Science, India |
| Agradecimiento |
|---|
| I.L.D.P. thanks the CNPq and CAPES for financial support. D. E. acknowledges the support of FONDECYT (Project No. 1140128) and FAI-2013-Puente (Universidad de los Andes). K. L. gratefully acknowledges the support of the NSF under Grant No. PHY-0855471. A. R. acknowledges the support of CNPq and CAPES/Nanobiotec. U. H. thanks the Indian Institute of Science, India for support of this work. |