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Title: Noise-induced Brownian motion of spiral waves
Author: Alonso, S.
Sagués i Mestre, Francesc
Keywords: Química física
Física estadística
Physical chemistry
Statistical physics
Issue Date: 2001
Publisher: The American Physical Society
Abstract: We study the erratic displacement of spiral waves forced to move in a medium with random spatiotemporal excitability. Analytical work and numerical simulations are performed in relation to a kinematic scheme, assumed to describe the autowave dynamics for weakly excitable systems. Under such an approach, the Brownian character of this motion is proved and the corresponding dispersion coefficient is evaluated. This quantity shows a nontrivial dependence on the temporal and spatial correlation parameters of the external fluctuations. In particular, a resonantlike behavior is neatly evidenced in terms of the noise correlation time for the particular situation of spatially uniform fluctuations. Actually, this case turns out to be, to a large extent, exactly solvable, whereas a pair of dispersion mechanisms are discussed qualitatively and quantitatively to explain the results for the more general scenario of spatiotemporal disorder.
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It is part of: Physical Review E, 2001, vol. 63, núm. 4, p. 046205-1-046205-12
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ISSN: 1063-651X
Appears in Collections:Articles publicats en revistes (Ciència dels Materials i Química Física)

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