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Accueil du site > Seminars > Séminaires théorie > Theory Club Friday January 29th at 10h45 (Zoom). Giulia Pisegna: "Equilibrium to off-equilibrium crossover in homogeneous active matter".

Theory Club Friday January 29th at 10h45 (Zoom). Giulia Pisegna: "Equilibrium to off-equilibrium crossover in homogeneous active matter"

Unless otherwise stated, seminars and defences take place at 11:30 in room 454A of Condorcet building.


Equilibrium to off-equilibrium crossover in homogeneous active matter

Abstract:

We study the crossover between equilibrium and off-equilibrium dynamical universality classes in the Vicsek model near its ordering transition. Starting from the incompressible hydrodynamic theory of Chen et al, we show that increasing the activity leads to a renormalization group (RG) crossover between the equilibrium ferromagnetic fixed point, with dynamical critical exponent z = 2, and the off-equilibrium active fixed point, with z = 1.7 (in d = 3). We run simulations of the classic Vicsek model in the near-ordering regime and find that critical slowing down indeed changes with activity, displaying two exponents that are in remarkable agreement with the RG prediction. The equilibrium-to-off-equilibrium crossover is ruled by a characteristic length scale beyond which active dynamics takes over. Such length scale is smaller the larger the activity, suggesting the existence of a general trade-off between activity and system’s size in determining the dynamical universality class of active matter. 

Friday, January 29th at 10h45 (Zoom)


Contact : Équipe séminaires / Seminar team - Published on / Publié le 5 March


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