The Pincus index vs. Lyapunov exponent of sine function, pulsar, earthquake, solar flare, FRB 20121102A, FRB 20190520B and Brownian motion. (IMAGE)
Caption
The top and middle panels present event series in the time-energy space of these sources. The color changes from blue to red, implying increased stochasticity. In the bottom panel, fast radio bursts congregate with Brownian motion toward highly random, yet less chaotic regions in the stochasticity-chaos phase space, which is distinct from earthquakes and solar flares, both of which are more chaotic but less random than FRBs.
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