Numerical exploration of the aging effects in spin systems

Abstract

An interesting concept that has been underexplored in the context of time-dependent simulations is the correlation of total magnetization, C(t). One of its main advantages over directly studying magnetization is that we do not need to meticulously prepare initial magnetizations. This is because the evolutions are computed from initial states with spins that are independent and completely random. In this paper, we take an important step in demonstrating that even for time evolutions from other initial conditions, C(t0,t), a suitable scaling can be performed to obtain universal power laws at T=Tc. We specifically consider the significant role played by the second moment of magnetization. Additionally, we complement the study by conducting a recent investigation of random matrices, which are applied to determine the critical properties of the system. Our results show that the aging in the time series of magnetization influences the spectral properties of matrices and their ability to determine the critical temperature of systems.