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Virtual walks in the Ising model: Finite-time scaling
Amit Pradhan1, Parongama Sen1, Sagnik Seth2
1University of Calcutta, Department of Physics, 92 Acharya Prafulla Chandra Road, Kolkata 700009, India.
None:
The dynamics of the spins in the Ising model are analyzed using a virtual walk scenario. The system is quenched from a very high temperature to a lower one using the Glauber scheme in one and two dimensions. A walk is associated with each spin which evolves according to the current state of the spin. The probability distribution of the displacement of the walker is calculated, which shows a distinct change as the temperature is increased. The average displacement as a function of time shows a nonequilibrium region stretched over a much longer time interval compared to the bulk magnetization. Nevertheless, one can still detect a time-dependent estimate of the critical point determined by two different methods. In addition, we introduce a virtual walk generated from the local energy of individual spins. Finite-time scaling of the different quantities estimated in two dimensions shows excellent consistency with the values of the known critical exponents.
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