Lexie Davison and David Sherrington 2000 J. Phys. A: Math. Gen. 33 8615 doi:10.1088/0305-4470/33/48/302
Lexie Davison and David Sherrington
Show affiliationsIn this paper we study a simple, purely topological, cellular model which is allowed to evolve through a Glauber-Kawasaki process. We find a non-thermodynamic transition to a glassy phase in which the energy (defined as the square of the local cell topological charge) fails to reach the equilibrium value below a characteristic temperature which is dependent on the cooling rate. We investigate a correlation function which exhibits ageing behaviour, and follows a master curve in the stationary regime when time is rescaled by a factor of the relaxation time tr. This master curve can be fitted by a von Schweidler law in the late β-relaxation regime. The relaxation times can be well fitted at all temperatures by an offset Arrhenius law. A power law can be fitted to an intermediate-temperature regime; the exponent of the power law and the von Schweidler law roughly agree with the relationship predicted by mode-coupling theory. By defining a suitable response function, we find that the fluctuation-dissipation ratio is held until sometime later than the appearance of the plateaux; non-monotonicity of the response is observed after this ratio is broken, a feature which has been observed in other models with dynamics involving activated processes.
64.70.P- Glass transitions of specific systems
05.40.-a Fluctuation phenomena, random processes, noise, and Brownian motion
37Bxx Topological dynamics (See also 54H20)
82C26 Dynamic and nonequilibrium phase transitions (general)
Soft matter, liquids and polymers
Issue 48 (8 December 2000)
Received 2 August 2000
Lexie Davison and David Sherrington 2000 J. Phys. A: Math. Gen. 33 8615
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