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SUMMARY:Non-equilibrium phase separation with reactions  - Yuting Irene Li
 \, University of Cambridge
DTSTART:20211206T163000Z
DTEND:20211206T170000Z
UID:TALK162349@talks.cam.ac.uk
CONTACT:Dr Christoph Schran
DESCRIPTION:Materials undergoing both phase separation and chemical reacti
 ons form an important class of non-equilibrium systems. Examples range fro
 m suspensions of self-propelled bacteria with birth-death dynamics\, to bi
 o-molecular condensates\, or ‘membraneless organelles’\, within cells.
  In contrast to their passive counterparts\, such systems have conserved a
 nd non-conserved dynamics that do not\, in general\, derive from a shared 
 free energy. This mismatch breaks time-reversal symmetry and leads to new 
 types of dynamical competition that are absent in or near equilibrium. We 
 construct a canonical scalar field theory to describe such systems\, with 
 conserved and non-conserved dynamics obeying Model B and Model A respectiv
 ely (in the Hohenberg-Halperin classification)\, chosen such that the two 
 free energies involved are incompatible. The resulting minimal model is sh
 own to capture the various phenomenologies reported previously for more co
 mplicated models with the same physical ingredients\, including microphase
  separation\, limit cycles and droplet splitting. We find a low-dimensiona
 l subspace of parameters for which time-reversal symmetry is accidentally 
 recovered\, and show that here the dynamics of the order parameter field (
 but not its conserved current) is exactly the same as an equilibrium syste
 m in which microphase separation is caused by long-range attractive intera
 ctions.
LOCATION:BMS Lecture Theatre\, Department of Chemistry
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