Cooperative behavior of fluctuating dynamical events

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An assembly of many elements often exhibits coherent behavior at a collective level. Such behavior is an example of cooperative phenomena, which appear in physical systems and also in social systems. Among many types of cooperative phenomena, recently, a new type of dynamically cooperative phenomenon was found in glassy systems. In this research subject, we have found this phenomenon in several systems other than glassy systems. Furthermore, we have developed theoretical methods for analyzing it and calculated quantities that characterizes the cooperative phenomenon.