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arXiv 1009.6004nlin.CD
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具有排斥相互作用的局部耦合相位振子中的相位和频率夹带

Phase and frequency entrainment in locally coupled phase oscillators with repulsive interactions

Michael Giver, Zahera Jabeen, Bulbul Chakraborty

摘要:

最近在含有Belousov-Zhabotinsky反应物的液滴的一维和二维微流体阵列中的实验显示了丰富多样的空间图案[J. Phys. Chem. Lett. 1,1241-1246(2010)]。这些液滴之间的主要偶联是抑制性的。受这个实验系统的启发,我们研究了具有最近邻相互作用的排斥耦合Kuramoto振荡器,一维线性链和环,以及二维三角晶格。在一维,我们使用线性稳定性分析以及数值研究,稳定的相位图案取决于晶格的几何形状。我们表明,过渡到有序状态不存在的热力学极限。在两个维度上,我们表明,晶格的几何形状约束两个相邻的振荡器之间的相位差为120度。我们报告存在的域与顺时针或逆时针螺旋,导致缺陷的晶格。我们研究了这些域的时间依赖性,并表明,在大的耦合强度,域冻结由于频率同步。上述现象的特征可以在空间关联函数中看到。

英文摘要:

Recent experiments in one and two-dimensional microfluidic arrays of droplets containing Belousov -Zhabotinsky reactants show a rich variety of spatial patterns [J. Phys. Chem. Lett. 1, 1241-1246 (2010)]. The dominant coupling between these droplets is inhibitory. Motivated by this experimental system, we study repulsively coupled Kuramoto oscillators with nearest neighbor interactions, on a linear chain as well as a ring in one dimension, and on a triangular lattice in two dimensions. In one dimension, we show using linear stability analysis as well as numerical study, that the stable phase patterns depend on the geometry of the lattice. We show that a transition to the ordered state does not exist in the thermodynamic limit. In two dimensions, we show that the geometry of the lattice constrains the phase difference between two neighbouring oscillators to 120 degrees. We report the existence of domains with either clockwise or anti-clockwise helicity, leading to defects in the lattice. We study the time dependence of these domains and show that at large coupling strengths, the domains freeze due to frequency synchronization. Signatures of the above phenomena can be seen in the spatial correlation functions.

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