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SUMMARY:Kirk Public Lecture: Evading Newton’s third law to set patterns 
 in motion - M Cristina Marchetti (University of California\, Santa Barbara
 )
DTSTART:20240606T150000Z
DTEND:20240606T160000Z
UID:TALK215809@talks.cam.ac.uk
DESCRIPTION:Newton&rsquo\;s third law establishes that pair interactions a
 re reciprocal: for every action\, there is an equal and opposite reaction.
  In some nonequilibrium multicomponent systems\, however\, interactions am
 ong different elements seem to evade this law. This occurs for instance wh
 en mesoscale forces are mediated by a nonequilibrium environment and is co
 mmon in the living world\, from molecular interactions between proteins to
  antagonistic interactions between predators and their prey and social for
 ces. This nonreciprocity breaks time-reversal symmetry\, resulting in the 
 emergence of traveling and oscillating patterns.\n&nbsp\;\nAfter reviewing
  familiar theoretical approaches to phase separation of two immiscible flu
 ids\, such as oil and water\, I will introduce a minimal model for the eme
 rgence of both spatial and temporal order observed in a broad class of non
 equilibrium settings\, from chemical reactions in living cells to active c
 ytoskeletal gels. These systems can be described in terms of two conserved
  concentration fields that ``chase&rsquo\;&rsquo\; each through antagonist
 ic cross-diffusivities. The resulting nonreciprocal dynamics yields a rich
  variety of traveling and oscillating patterns\, with many features that c
 an be analyzed analytically. This model provides a generic description for
  the transition from stationary to self-organized dynamical patterns and i
 dentifies a new class of pattern formation.
LOCATION:Seminar Room 1\, Newton Institute
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