# "How to Synchronize Chaotic Systems"

**Note:***Coffee will be served at 3pm; Talk begins at 3:30pm

**Speaker:**Louis Pecora, United States Naval Research Laboratory

**When:**October 17, 2017 (Tue), 03:00PM to 05:00PM (add to my calendar)

**Location:**SCI 109

**Hosted by:**Plamen Ivanov

*This event is part of the Physics Department Colloquia Series. *

The concept of synchronized systems has been around for centuries with one of the earliest studies being on the synchronization of clocks by Christiaan Huygens in the mid 1700's. By the mid 1900's it was well-known how to mathematically model the synchronization of systems that oscillated periodically or regularly, i.e. in a steady, repeatable way. But as a new type of motion called chaos started to be studied in the 1970's the notion of synchronization of such systems was difficult to grasp since chaotic systems never repeated or had regular periodic motion. Their movement was complex on all levels and fractal in nature. I'll introduce the notion of chaos and then show how one can synchronize chaotic systems. I'll give a little history of the subject and mention some possible uses proposed for such systems. Although I will start with two synchronized chaotic systems, I'll show how to synchronize an entire network of chaotic oscillators and, more importantly, how to determine the stability of such systems in a way that solves the problem for all networks linking a particular oscillator type at each network node. I'll wind up introducing the more complex problem of cluster synchronization, which I'll talk about at a more technical talk the following day.