Activity controlled morphologies in effective interactions in model active matter

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• Ignacio Pagonabarraga (University of Barcelona)
• Tuesday 18 March 2025, 13:00-14:00
• Center for Mathematical Sciences, Lecture room MR4.

If you have a question about this talk, please contact Sarah Loos.

Active matter systems are intrinsically out of equilibrium in the absence of any external driving. Their collective behavior emerges from a balance between direct interactions and indirect couplings through the medium they move in, and a self-consistent dynamical approach is required to analyze their evolution. The mechanical balance that determines their collective behavior makes these systems very versatile. An understanding on the basic principles underlying the emergence and self-assembly on active systems poses fundamental challenges. I will consider simple models to address the fundamental properties of active systems, which require a consistent dynamic treatment, and will discuss the generic implications that the symmetry of self-propulsion has in the emergence of structures in suspensions of model self-propelled particles, and in complex environments. I will discuss the interactions between passive inclusions in an active suspension, where passive particles couple to the active suspension where their relative dynamics plays an important role in the features that characterize the emergent interactions among the inclusions. Moreover, for systems where active particles develop long range polar order, the presence of passive obstacles triggers spontaneous macroscopic structures that give rise to non-reciprocal interactions. I will also discuss the susceptibility of polar active systems to small inclusions and the implications this has on the nature of their ordered phases, and will discuss a few consequences that activity has in the emergent behavior of active mixtures and the mechanisms that promote them.

This talk is part of the DAMTP Statistical Physics and Soft Matter Seminar series.

This talk is included in these lists:

• All CMS events
• Center for Mathematical Sciences, Lecture room MR4
• DAMTP Statistical Physics and Soft Matter Seminar
• Soft Matter
• bld31

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