🧵 Today's SFI Seminar:
"#Coherence, Chimeras and Passage #Time #Statistics in #Light" by Rajarshi Roy ()
Streaming now:
youtube.com/watch?v=sjtAla
Conversation
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A piece of science history:
K. Ikeda shows that Lorenz model of instabilities in fluids applies to the dynamics of laser systems. Chaotic behavior in light:
youtube.com/watch?v=sjtAla
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1) Three key books in the developing understanding of #PassageProcesses.
2) "We're forcing the #laser to go in one direction around this ring...it's a unidirectional ring laser described by this simple equation that describes how it's driven by #noise."
youtube.com/watch?v=sjtAla
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"The mean time taken by the #laser system to reach a certain level...it doesn't take the same time to get there each time I turn the laser on. There are distributions of passage times. [On the left] is a set of Monte Carlo simulations."
youtube.com/watch?v=sjtAla
#fluctuation #light
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"What I'm showing here is a #laser system which has two modes, two frequencies between which it can hop back and forth depending on how much #noise is present at each #frequency. The barrier between these states would change as I changed the pumping."
youtube.com/watch?v=sjtAla
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"If you took an ensemble of phase #oscillators & coupled all of them identically to each other, you could see it spontaneously break up into two groups — one in which they were synchronized & one in which they weren't. The result didn't register until found it..."
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"What they were talking about the loss of #coherence in #DynamicalSystems: the transition from order to disorder. When you changed the range and strength of coupling, you saw them transition into #chimera states in these logistic maps."
#light #chaos
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"You could map the dynamics of a single time-delayed #FeedbackLoop into a system of time-delayed coupled #oscillators. This didn't come to us until 2016 when we started to witness the breakdown of our experimental systems..."
(smaller time delay → greater instability)
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"You can have REALLY weak light, where you can count individual photons, and as you go from just a few photons at a time to many, you can see the photon-by-photon birth of a chaotic attractor."
(Work of Aaron Hagerstrom, now at :
nist.gov/people/aaron-h)
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"We thought [four #oscillators] could lead to the smallest #chimera state that could be...but you can simulate the behavior of two coupled systems with just one. You can do that with the right kind of electronics: set up a 'poor person's' version."
youtube.com/watch?v=sjtAla
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