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UID:fed492560b078acbdbce82347b0e1757
CATEGORIES:Mathematical Physics Seminar
CREATED:20250211T124652
SUMMARY:Webinar: Michael Cates - Multiple interfacial tensions in active phase separation
LOCATION:zoom
DESCRIPTION:<p style="text-align: center;"><strong>Michael Cates– University of Cambrid
 ge</strong></p><p style="text-align: center;"><strong>&nbsp;</strong></p><p
  style="text-align: center;"><strong>Wednesday,&nbsp;March 5th ,&nbsp;10:45
 AM EST</strong></p><p style="text-align: center;"><strong>&nbsp;</strong></
 p><p style="text-align: center;"><strong>Multiple interfacial tensions in a
 ctive phase separation</strong></p><p style="text-align: center;"><strong>&
 nbsp;</strong></p><p>In thermal equilibrium, the interfacial tension betwee
 n coexisting phases is a free energy derivative with respect to the interfa
 cial area. Consistent with thermodynamics, many different measurements or d
 efinitions of the tension (via, say, the capillary wave spectrum or the Lap
 lace pressure at a curved interface) all give the same answer. There is no 
 such consistency for interfaces in active systems. Indeed a minimal scalar 
 field theory of active phase separation (Active Model B+) gives at least th
 ree distinct tensions, some of which can be negative without the interface 
 losing stability. The various tensions have interesting consequences for th
 e phase diagram and also for nucleation, where (luckily) the quasipotential
  is calculable at the level of classical nucleation theory. Using that quas
 ipotential, I will attempt to argue that AMB+'s mismatch in tension between
  liquid-in-vapor and vapor-in-liquid droplets shows its stationary measure 
 to be nonlocal -- not just in certain phases or parameter regimes, but in g
 eneral. This augurs against recent proposals to construct effective field t
 heories for active systems via a Landau Ginzburg expansion within the stati
 onary measure, rather than within the equations of motion.</p>
DTSTAMP:20260828T050041
DTSTART;TZID=America/New_York:20250305T104500
DTEND;TZID=America/New_York:20250305T120000
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