info:eu-repo/semantics/article
Equilibrium to off-equilibrium crossover in homogeneous active matter
Registro en:
Cavagna, Andrea; Di Carlo, Luca; Giardina, Irene; Grigera, Tomas Sebastian; Pisegna, Giulia; Equilibrium to off-equilibrium crossover in homogeneous active matter; American Physical Society; Physical Review Research; 3; 1; 3-2021; 13210-13210
2643-1564
CONICET Digital
CONICET
Autor
Cavagna, Andrea
Di Carlo, Luca
Giardina, Irene
Grigera, Tomas Sebastian
Pisegna, Giulia
Resumen
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. [Critical phenomenon of the order-disorder transition in incompressible active fluids, New J. Phys. 17, 042002 (2015)NJOPFM1367-263010.1088/1367-2630/17/4/042002], 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. The larger the activity is, the smaller is such a length scale, suggesting the existence of a general trade-off between activity and the system's size in determining the dynamical universality class of active matter. Fil: Cavagna, Andrea. Consiglio Nazionale delle Ricerche; Italia. Università degli studi di Roma "La Sapienza"; Italia Fil: Di Carlo, Luca. Università degli studi di Roma "La Sapienza"; Italia. Consiglio Nazionale delle Ricerche; Italia Fil: Giardina, Irene. Consiglio Nazionale delle Ricerche; Italia. Università degli studi di Roma "La Sapienza"; Italia. Istituto Nazionale di Fisica Nucleare; Italia Fil: Grigera, Tomas Sebastian. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Física de Líquidos y Sistemas Biológicos. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Física de Líquidos y Sistemas Biológicos; Argentina. Consiglio Nazionale delle Ricerche; Italia Fil: Pisegna, Giulia. Università degli studi di Roma "La Sapienza"; Italia. Consiglio Nazionale delle Ricerche; Italia