BEGIN:VCALENDAR VERSION:2.0 PRODID:-//Talks.cam//talks.cam.ac.uk// X-WR-CALNAME:Talks.cam BEGIN:VEVENT SUMMARY:Activity-induced interactions and collective response in model a ctive matter - Ignacio Pagonabarraga (Universitat de Barcelona) DTSTART:20231129T110000Z DTEND:20231129T120000Z UID:TALK208711@talks.cam.ac.uk DESCRIPTION:Flocks of birds\, schools of fishes\, or bacterial colonies co nstitute examples of living systems that coordinate their motion. In all t hese systems their constituent elements generate motion due to energy cons umption and can exchange information or react sensitively to chemical cues to move together or to react collectively to external signals. Artificial systems\, such as nanorobots\, exploit the heterogeneous compositions of their surface to displace because of the heterogeneous chemical processes that take place in the presence of appropriate chemical substances.These s ystems are intrinsically out of equilibrium in the absence of any external driving\, and their collective properties result as a balance between the ir direct interactions and the indirect coupling to the medium in which th ey displace. This balance leads usually to the emergence of long-range spa tial correlations and slow relaxation times. \; These correlations hav e strong implications on the sensitivity of active systems to external per turbations and disorder\, or to the properties of the effective interactio ns  \;that determine the emergent phases that characterize them.In ord er to understand the basic principles underlying the emergence and self-as sembly on active systems I will introduce simple statistical  \; model s\, and will  \;show the relevance of shape and symmetries in the non- equilibrium phase transitions of active systems\, as well as their respons e to localized perturbations and the implications this has on the effectiv e interactions of suspension of inclusions embedded in an active bath. LOCATION:Seminar Room 2\, Newton Institute END:VEVENT END:VCALENDAR