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Glassy behaviour in a simple topological model

Lexie Davison and David Sherrington

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In 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.


PACS

64.70.P- Glass transitions of specific systems

05.40.-a Fluctuation phenomena, random processes, noise, and Brownian motion

02.40.-k Geometry, differential geometry, and topology

61.20.Lc Time-dependent properties; relaxation

MSC

82D15 Liquids

37Bxx Topological dynamics (See also 54H20)

82C26 Dynamic and nonequilibrium phase transitions (general)

Subjects

Soft matter, liquids and polymers

Mathematical physics

Condensed matter: structural, mechanical & thermal

Statistical physics and nonlinear systems

Dates

Issue 48 (8 December 2000)

Received 2 August 2000



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