Universal amplitudes ratios for critical aging via functional renormalization group

Dec 6, 2021
30 pages
Published in:
  • J.Phys.A 55 (2022) 26, 264008
  • Published: Jun 9, 2022
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Abstract: (IOP)
We discuss how to calculate non-equilibrium universal amplitude ratios in the functional renormalization group approach, extending its applicability. In particular, we focus on the critical relaxation of the Ising model with non-conserved dynamics (model A) and calculate the universal amplitude ratio associated with the fluctuation–dissipation ratio of the order parameter, considering a critical quench from a high-temperature initial condition. Our predictions turn out to be in good agreement with previous perturbative renormalization-group calculations and Monte Carlo simulations.
  • nonequilibrium dynamics
  • functional renormalisation group
  • universality
  • critical dynamics
  • aging dynamics