School of Physical Sciences, JNU, New Delhi 110 067
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Ramakrishna Ramaswamy, School of Physical Sciences, JNU, New Delhi, is President of Indian Academy of Sciences (2016-18). Ramaswamy’s research interests are in the intersection of nonlinear science, statistical physics, and computational biology. He is also a Fellow of the Indian National Science Academy and of The World Academy of Sciences, (TWAS).
Session 1A - Presidential Address
Chimeras: A spontaneous emergence of dynamical disorder
Networks of identically coupled nonlinear oscillators can in some circumstances spontaneously split into subgroups with different dynamical characteristics. In the simplest examples, there are two subgroups, one of which is fully synchronised while the other is desynchronised; more complex dynamical patterns are possible. Chimeras were first discovered in numerical studies, but have, in the past two decades, been seen in a number of experiments, and are believed to underlie interesting physiological states such as uni-hemispheric sleep that sea mammals and birds experience. Other situations where such states of broken symmetry may be relevant include ventricular fibrillation, and the so-called bump states in neural networks. The origin of the symmetry breaking that gives rise to such complex spatiotemporal patterns and the current interest in these phenomena will be discussed.