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SUMMARY:About fluctuating many-body systems with nonreciprocal interaction
 s - Sarah A.M. Loos (University of Cambridge)
DTSTART:20240509T150000Z
DTEND:20240509T160000Z
UID:TALK216853@talks.cam.ac.uk
DESCRIPTION:Reciprocity is a hallmark of thermal equilibrium\, but ubiquit
 ously broken in far-from-equilibrium systems. I will give some insights in
 to how nonreciprocal interactions can fundamentally affect the phases and 
 fluctuations of many-body systems.&nbsp\;\nFirst\, in binary fluids\, nonr
 eciprocal coupling between fluid components can cause the emergence of tra
 velling waves through PT symmetry-breaking phase transitions. Using a nonr
 eciprocal field model\, we show that fluctuations not only inflate\, as in
  equilibrium criticality\, but also develop an asymptotically increasing t
 ime-reversal asymmetry [1-3]. The formation of dissipative patterns and th
 e emergence of irreversible fluctuations can both be attributed to a mecha
 nism of mode coupling in the vicinity of critical exception points. For a 
 nonreciprocal Cahn-Hilliard model\, we show that this manifests itself in 
 actively propelled interfaces whose dynamics can be mapped to the motion o
 f a single microswimmer [3]. Second\, introducing nonreciprocal coupling i
 n the two-dimensional XY model\, we show how nonreciprocity can lead to th
 e formation of true long-range order [4]\, as well as dynamical phases and
  chaos.[1] Suchanek\, Kroy \\& SL\, Irreversible mesoscale fluctuations he
 rald the emergence of dynamical phases\, Phys. Rev. Lett. 131\, 258302 (20
 23)[2] Suchanek\, Kroy \\& SL\, Time-reversal and parity-time symmetry bre
 aking in non-Hermitian field theories\, Phys. Rev. E 108\, 064123 (2023)[3
 ] Suchanek\, Kroy \\& SL\, Entropy production in the nonreciprocal Cahn-Hi
 lliard model\, Phys. Rev. E 108\, 064610 (2023)\n[4] SL\, Klapp \\& Martyn
 ec\, Long-Range Order and Directional Defect Propagation in the Nonrecipro
 cal XY Model with Vision Cone Interactions\, Phys. Rev. Lett. 130\, 198301
  (2023)
LOCATION:Seminar Room 1\, Newton Institute
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