Observable-dependence of the effective temperature in off-equilibrium diatomic molecular liquids

Ninarello, Andrea; Gnan, Nicoletta; Sciortino, Francesco

doi:10.1063/1.4901526

Cited by 3 publications

(2 citation statements)

References 54 publications

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“…A recent analysis of the effective temperature ideas in a passive dumbbell system has shown that the relation between the two can depend non-trivially on the elongation of the molecule [86]. It would be very interesting to explore the effect of this parameter in the results that we showed and to investigate the fluctuation-dissipation relations of rotational degrees of freedom in the active dumbbell system as well.…”

Section: Discussionmentioning

confidence: 99%

Dynamics of a homogeneous active dumbbell system

et al. 2014

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We analyse the dynamics of a two dimensional system of interacting active dumbbells. We characterise the mean-square displacement, linear response function and deviation from the equilibrium fluctuation-dissipation theorem as a function of activity strength, packing fraction and temperature for parameters such that the system is in its homogeneous phase. While the diffusion constant in the last diffusive regime naturally increases with activity and decreases with packing fraction, we exhibit an intriguing non-monotonic dependence on the activity of the ratio between the finite density and the single particle diffusion constants. At fixed packing fraction, the time-integrated linear response function depends non-monotonically on activity strength. The effective temperature extracted from the ratio between the integrated linear response and the mean-square displacement in the last diffusive regime is always higher than the ambient temperature, increases with increasing activity and, for small active force it monotonically increases with density while for sufficiently high activity it first increases to next decrease with the packing fraction. We ascribe this peculiar effect to the existence of finite-size clusters for sufficiently high activity and density at the fixed (low) temperatures at which we worked. The crossover occurs at lower activity or density the lower the external temperature. The finite density effective temperature is higher (lower) than the single dumbbell one below (above) a cross-over value of the Péclet number.

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Section: Discussionmentioning

confidence: 99%

Dynamics of a homogeneous active dumbbell system

et al. 2014

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“…We conclude by mentioning that although there is a theoretical framework that suggests and explain effective temperature in glassy systems, and despite several simulations providing supporting evidences, numerical and experimental investigations are still going on in order to determine in a conclusive way whether this notion of effective temperature hold for realistic systems (Kurchan 2005). The main issue is whether T ef f really is observable independent, as a true temperature should be (Ninarello et al 2014).…”

Section: Glassy Systemsmentioning

confidence: 93%

Slow relaxations and nonequilibrium dynamics in classical and quantum systems

Biroli¹

2016

Strongly Interacting Quantum Systems Out of Equilibrium

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I wish to thank the organisers of the Les Houches Summer School of Physics Strongly Interacting Quantum Systems Out of Equilibrium for their invitation to lecture. It was a great opportunity to thoroughly think on several topics on out of equilibrium dynamics.Much of what I learned on out of equilibrium dynamics, and that I retransmitted to the students, is due to collaborations and interactions with colleagues and friends. I will not list all their names here (a too long list . . . I had a lot to learn) but I thank them all. Last but not least, special thanks are due to T. Giamarchi and L.F. Cugliandolo for their encouragements (and patience!). Contents 1 Coupling to the Environment: What is a Reservoir? 1.1 What does a reservoir do to a system? 1.2 The simplest reservoir: linearly coupled Harmonic oscillators 1.3 Noise and irreversibility 1.4 The environment 2 Field Theory, Time-Reversal Symmetry and Fluctuation Theorems 2.1 Martin-Siggia-Rose-DeDominicis-Janssen field theory 2.2 Meaning of the fields 2.3 Generalizations 2.4 Relationship with Schwinger-Keldysh field theory 2.5 Time-reversal symmetry 2.6 Time-reversal symmetry breaking and fluctuation relations out of equilibrium 2.7 Quantum systems 3 Thermalization 3.1 The meaning of thermalization 3.2 Classical systems coupled to a bath 3.3 Quantum systems coupled to a bath 3.4 Isolated systems 4 Quenches and Coarsening 4.1 Thermal Quenches 4.2 Coarsening 4.3 Curvature-driven Domain Growth 4.4 Kibble-Zurek Mechanism and Slow Thermal Quenches 4.5 Quantum fluctuations 5 Quenched Disorder and Slow Dynamics 5.1 Broad distribution of relaxation times 5.2 Broad distribution of low energy excitations 5.3 Activated dynamics scaling and zero temperature fixed points 5.4 Domain growth and coarsening in disordered systems 5.5 Infinite randomness fixed points 6 Effective Temperatures 6.1 Metastable equilibrium 6.2 Driven and Active Systems 6.3 Glassy systems viii Contents References 55

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Violation of the fluctuation-dissipation theorem and effective temperatures in spin ice

Raban

Holdsworth

2022

Phys. Rev. B

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Observable-dependence of the effective temperature in off-equilibrium diatomic molecular liquids

Cited by 3 publications

References 54 publications

Dynamics of a homogeneous active dumbbell system

Dynamics of a homogeneous active dumbbell system

Slow relaxations and nonequilibrium dynamics in classical and quantum systems

Violation of the fluctuation-dissipation theorem and effective temperatures in spin ice

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