PMMH’s weekly seminar is held every Friday at 11 am (map)

Contact :
Benoit Semin
Sylvain Patinet
Etienne Reyssat
responsables-seminaires (arobase)

75005 PARIS

Tel : (33) 1 40 79 45 22

Séminaire PMMH - Varda Hagh (Univ. of Chicago)

Vendredi 10 décembre 2021 11:00-12:00 - Salle réunion PMMH 1

Free-then-freeze : transient learning degrees of freedom for introducing function in materials

Many protocols used in material design and training have a common theme : they introduce new “learning'' degrees of freedom, often by relaxing away existing constraints, and then evolve these degrees of freedom based on a rule that leads the material to a desired state at which point these learning degrees of freedom are frozen out. Using this conceptual framework, we first introduce and subsequently remove different sets of degrees of freedom from the energy minimization process of athermal particle packings. By doing so, we are able to create stable jammed packings that exist in exceptionally deep energy minima marked by the absence of low-frequency quasilocalized modes ; this added stability persists in the thermodynamic limit. We show that the inclusion of particle radii as learning degrees of freedom leads to deeper and much more stable minima than does the inclusion of particle stiffnesses. This is because particle radii couple to the jamming transition whereas stiffnesses do not. Thus different choices for the learning degrees of freedom can lead to very different training outcomes.


Seminars  (2)

  • Séminaire PMMH - Leonid Berlyand, Penn State
    Vendredi 16 septembre 11:00-12:00 - Salle réunion PMMH 1
  • Séminaire PMMH - (Benjamin Favier, CNRS, IRPHE, Marseille)
    Vendredi 30 septembre 11:00-12:00 - Salle réunion PMMH 1
    Interactions between thermal convection and a melting front
    A pure and incompressible material is confined between two plates such that it is heated from below and cooled from above. When its melting temperature is comprised between these two imposed temperatures, an interface separating liquid and solid phases appears. Depending on the initial conditions, freezing or (...)
Information for the speakers

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.

Link to cofee seminar (internal, every Thursday)


Practical information

Laboratoire : 01 40 79 45 22
Directeur : Damien Vandembroucq
Codirecteur : Philippe Petitjeans
Administratrice : Frédérique Auger (01 40 79 45 22)
Gestionnaire : Claudette Barez (01 40 79 58 53)
Courriel : dir (arobase)