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SUMMARY:Screw Symmetry and Chiral Hydrodynamics - Gareth Alexander (Univer
 sity of Warwick)
DTSTART:20260127T130000Z
DTEND:20260127T140000Z
UID:TALK243415@talks.cam.ac.uk
CONTACT:Balázs Németh
DESCRIPTION:Active cholesterics are chiral in both their structure\, which
  has continuous screw symmetry\, and their active stresses\, which include
  contributions from torque dipoles. Both expressions of chirality give ris
 e to curl forces in the hydrodynamics\, which we derive from the active Er
 icksen-Leslie equations using a geometric approach. This clarifies the hyd
 rodynamics of continuous screw symmetry and provides an example of general
 ised odd elastic forces that originate from an equilibrium free energy. Fo
 r the active instability\, screw symmetry generates a contribution of chir
 al activity to the linearised pseudolayer hydrodynamics that is absent in 
 materials with chiral activity but achiral structure and produces an activ
 e instability that is sensitive to the cholesteric handedness. Finally\, a
 s time allows\, I will discuss the chiral hydrodynamics of materials with 
 three-dimensional screw symmetry. This is joint work with SJ Kole\, Ananyo
  Maitra and Sriram Ramaswamy.
LOCATION:Center for Mathematical Sciences\, Lecture room MR4.
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