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PMMH’s weekly seminar is held every Friday at 11 am (map)
Stéphane Perrard
Etienne Reyssat
Virgile Thiévenaz
PMMH
BARRE CASSAN
BAT A 1ER ETAGE CASE 18
7 QUAI SAINT BERNARD
75005 PARIS
France
Tel : (33) 1 40 79 45 22
Séminaire PMMH – Aubin Archambault (IUSTI, Marseille)
From stochastic thermodynamics to disordered mechanics
In the first part, I will discuss the link between thermodynamics and information theory at the microscopic scale. The usual laws of thermodynamics are known for their robustness and universality. However, when thermal fluctuations are on the same scale as the studied phenomena, these laws only describe the average behaviour. While it is impossible to macroscopically extract work from thermal fluctuations, this limit can be overcome by adapting the protocols based on the outcome of a measurement. I will present an experimental realisation of information engine, monothermal cycles which evolution is determined by the result of a measurement on the system. It is then possible to extract energy from thermal fluctuations, seemingly breaking the second Law of thermodynamics, and optimise the engine to maximise the work extraction in different regimes. These measurements are used to test recent theoretical results bounding the extracted work by the amount of information taken by the operator.
In the second part, I will focus on the intringuing mechanical properties of disordered packings of long elastic fibers. Though the mechanics of a single fiber is easily understood from its geometry and elastic modulus, assemblies show non-trivial collective responses, because contacts between fibers evolve as the assemblies deform, but also because of the irreversibility brought by friction. On the basis of compression experiments with assemblies and fibers of different sizes and material, we discuss the relevance and some limitation of previous elastic scalings, derived for wool fiber assemblies, and we highlight the important role of friction, even for purely monotonic compression.
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Seminars (2)
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Séminaire PMMH – Lara Kohler (Max Planck Dresden)
Vendredi 19 décembre de 11h00 à 12h00 - Salle réunion PMMH 1
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Séminaire PMMH – Cécile Callou (Muséum d'Histoire naturelle)
Vendredi 9 janvier 2026 de 11h00 à 12h00 - Salle réunion PMMH 1
The audience is composed of people with rather heterogeneous backgrounds including specialists in solids, fluids, granular flows, statistical physics... so the idea is to keep your talk understandable by people not necessarily working in your field... The seminar time slot runs from 11am to noon so the best is to make the talk last around 45 minutes to leave some time for discussion.
- Séminaires ESPCI-ENS de biophysique
- Séminaires du Département de Physique de l’ENS
- Séminaires du Laboratoire d’Hydrodynamique de l’X
- Séminaire de Mécanique d’Orsay (page web FAST)
- Séminaire de Mécanique d’Orsay (page web LIMSI)
- Séminaire de Mécanique des Fluides de l’Institut Jean le Rond d’Alembert
- Séminaires du laboratoire MSC, Paris VII
- Séminaires Gulliver
Link to cofee seminar (internal, every Thursday)
