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Abstract:Ìý

TheÌýsystemsÌýwhoseÌýpartsÌýcan lead toÌýemergentÌýproperties that can hardlyÌýbe inferred from properties of partsÌýare called complex.ÌýObserving such complex systems, one sees that fluctuations, occurring in seemingly disordered agglomerations driven by physical, biological and/or social interactions, are able to lead to coherent patterns that evolve in time. Collective behaviors magically arise out of disorder. ÌýImagine the coherent group motion of a large community of fish. How will this motion adapt when a single predator will attack such a large community? ÌýIn this talk, I will enumerate some of the highlights of the work byÌýG.ÌýParisiÌý(Rome) - recipient of the 2021 Nobel Prize in Physics.Ìý

The talk will focus mostly on his influence on the study of collective animal motions. Following the same line of thinking, I will show by means of simple examples involving human crowds - complex systems that we study in ¹û¶³´«Ã½ - Ìýthat collective behaviors can arise out of very simple mechanisms.

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