Glassy dynamics: effective temperatures and intermittencies from a two-state model

Naspreda, M.; Reguera, David; Pérez‐Madrid, A.; Rubı́, J. M.

doi:10.1016/j.physa.2004.12.005

Cited by 5 publications

(5 citation statements)

References 19 publications

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“…On the contrary, it resembles a dichotomous stochastic process having a finite correlation time due to the intermittency which causes hopping events between both metastable states of the system. As it is well known, this intermittency, characterized by non-Gaussian distributions, is one of the characteristics of non-equilibrated processes [27,28].…”

Section: A Entropy Production and Stochastic Kinetic Equationsmentioning

confidence: 99%

Nonlinear irreversible thermodynamics of single-molecule experiments

et al. 2015

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Irreversible thermodynamics of single-molecule experiments subject to external constraining forces of a mechanical nature is presented. Extending Onsager's formalism to the non-linear case of systems under non-equilibrium external constraints, we are able to calculate the entropy production and the general non-linear kinetic equations for the variables involved. In particular, we analyze the case of RNA stretching protocols obtaining critical oscillations between different configurational states when forced by external means to remain in the unstable region of its free-energy landscape, as observed in experiments. We also calculate the entropy produced during these hopping events, and show how resonant phenomena in stretching experiments of single RNA macromolecules may arise. We also calculate the hopping rates using Kramer's approach obtaining a good comparison with experiments.

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Section: A Entropy Production and Stochastic Kinetic Equationsmentioning

confidence: 99%

Nonlinear irreversible thermodynamics of single-molecule experiments

et al. 2015

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“…The behavior of these models is not consistent with that of our system, because in the case of domain growth the huge temperature is given by a weak response not by an increase of the noise signal. Other models which may present large T eff are the trap models [22,[32][33][34][35][36]. Their basic ingredient is an activation process and aging is associated to the fact that deeper and deeper valleys are reached as the system evolves.…”

Section: Discussionmentioning

confidence: 99%

Off equilibrium fluctuations in a polymer glass

Buisson

Ciliberto

2005

Physica D: Nonlinear Phenomena

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The fluctuation-dissipation relation (FDR) is measured on the dielectric properties a polymer glass (polycarbonate). It is observed that the fluctuation dissipation theorem is strongly violated for a quench from above to below the glass transition temperature. The amplitude and the persistence time of this violation are decreasing functions of frequency. Around $1Hz$ it may persist for several hours. The origin of this violation is a highly intermittent dynamics characterized by large fluctuations a strongly non-Gaussian statistics. The intermittent dynamics depends on the quenching rate and it disappears after slow quenches. The relevance of these results for recent models of aging are discussed.Comment: submitted to Physica

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“…For example the trap model [32] which is based on a phase space description of the aging dynamics. Its basic ingredient is an activation process and aging is associated to the fact that deeper and deeper valleys are reached as the system evolves [23,24,25,26,27]. The dynamics in this model has to be intermittent because either nothing moves or there is a jump between two traps [23].…”

Section: Discussionmentioning

confidence: 99%

“…For example the thermal noise may present a strong intermittency which slowly disappear during aging. Although several theoretical models predict this intermittency [23,24,25,26] the experimental conditions which produce such a kind of behaviour are unclear. Therefore new experiments are necessary to increase our knowledge on the thermal noise properties of the aging materials.…”

Section: Introductionmentioning

confidence: 99%

Thermal Noise Properties of Two Aging Materials

Bellon¹,

Buisson²,

Ciccotti³

et al.

Jamming, Yielding, and Irreversible Deformation in Condensed Matter

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In this lecture we review several aspects of the thermal noise properties in two aging materials: a polymer and a colloidal glass. The measurements have been performed after a quench for the polymer and during the transition from a fluid-like to a solid-like state for the gel. Two kind of noise has been measured: the electrical noise and the mechanical noise. For both materials we have observed that the electric noise is characterized by a strong intermittency, which induces a large violation of the Fluctuation Dissipation Theorem (FDT) during the aging time, and may persist for several hours at low frequency. The statistics of these intermittent signals and their dependance on the quench speed for the polymer or on sample concentration for the gel are studied. The results are in a qualitative agreement with recent models of aging, that predict an intermittent dynamics. For the mechanical noise the results are unclear. In the polymer the mechanical thermal noise is still intermittent whereas for the gel the violation of FDT, if it exists, is extremely small.

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Glassy dynamics: effective temperatures and intermittencies from a two-state model

Cited by 5 publications

References 19 publications

Nonlinear irreversible thermodynamics of single-molecule experiments

Nonlinear irreversible thermodynamics of single-molecule experiments

Off equilibrium fluctuations in a polymer glass

Thermal Noise Properties of Two Aging Materials

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