Differential susceptibility to noise of mixed Turing and Hopf modes in a photosensitive chemical mediumS. Alonso1, D. G. Míguez2 and F. Sagués3
1 Abteilung Physikalische Chemie, Fritz-Haber-Institut der Max-Plank-Gesellschaft - 14195 Berlin, Germany
2 Department of Systems Biology, Harvard Medical School - 02115 Boston, MA, USA
3 Departament de Química Física, Universitat de Barcelona - 08028 Barcelona, Spain
received 5 October 2007; accepted in final form 27 November 2007; published February 2008
published online 31 December 2007
We report on experiments with the photosensitive chlorine dioxide-iodine-malonic acid reaction (CDIMA) when forced with a random (spatiotemporally) distributed illumination. Acting on a mixed mode consisting of oscillating spots, close enough to the Hopf and Turing codimension-two bifurcation, we observe attenuation of oscillations while the spatial pattern is preserved. Numerical simulations confirm and extend these results. All together these observations point out to a larger vulnerability of the Hopf with respect to the Turing mode when facing noise of intermediate intensity and small correlation parameters.
05.40.Ca - Noise.
82.40.Ck - Pattern formation in reactions with diffusion, flow and heat transfer.
47.54.-r - Pattern selection; pattern formation.
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