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BEGIN:VEVENT
UID:0-755@lptms.universite-paris-saclay.fr
DTSTART:20201217T143000Z
DTEND:20201217T160000Z
DTSTAMP:20201130T150331Z
URL:https://www.lptms.universite-paris-saclay.fr/seminars/soutenance-de-th
 ese-antonio-sclocchi/
SUMMARY:Soutenance de thèse: Antonio Sclocchi - LPTMS (100% online seminar
 ) - 17 Déc 20 14:30
DESCRIPTION:A new critical phase in jammed models: jamming is even cooler t
 han before\npar\n\nAntonio Sclocchi\n&nbsp\;\nOnline defense – Zoom Meet
 ing ID: 940 6511 8835 – Password: 520321\nJury:\nJean-Louis Barrat\, Uni
 versité Grenoble-Alpes\, examinateur\nGiuseppe Foffi\, Université Paris-
 Saclay\, examinateur\nSilvio Franz\, LPTMS\, directeur de thèse\nLuca Leu
 zzi\, Consiglio Nazionale delle Ricerch\, rapporteur\nAndrea Liu\, Univers
 ity of Pennsylvania\, examinatrice\nMarkus Müller\, Paul Scherrer Institu
 t\, rapporteur\nPierfrancesco Urbani\, CNRS\, CEA Saclay\, examinateur\nMa
 tthieu Wyart\, École Polytechnique Fédérale de Lausanne\, examinateur\n
 Resumé:\n\n\nOver the last two decades\, an intensive stream of research 
 has characterized the jamming transition\, a zero-temperature critical poi
 nt of systems with short-range repulsive interactions. Many of its propert
 ies are independent of spatial dimensionality\, with mean-field scalings b
 eing valid even for two-dimensional systems.\nIn this thesis\, we extend t
 his critical behavior from the jamming transition point to an entire jamme
 d phase. This is obtained by using a short-range linear repulsive interact
 ion potential for soft spheres and for a related mean-field model\, i.e. t
 he perceptron.We show that the non-differentiable point in the pairwise in
 teraction potential produces a network of tangent spheres (a “contact ne
 twork”) at every density beyond the jamming transition. The contact netw
 orks characterizing the minima of the system are isostatic\, critically se
 lf-organized and marginally stable.\nIn the first part\, we study the jamm
 ed phase of the perceptron\, both numerically and theoretically using tech
 niques developed for mean-field glassy systems. We show the presence of a 
 critical phase and we develop a zero-temperature scaling theory which esta
 blishes its universality class.Therefore\, we use numerical simulations to
  study the soft spheres case in two and three dimensions and we point out 
 the presence of the critical jammed phase also in finite dimensions.\nIn t
 he second part\, we define a compression protocol for the perceptron that 
 allows us to study the avalanche dynamics in the critical phase. We show t
 hat the avalanche sizes are scale-free power law distributed with divergen
 t first moment and we characterize the finite-size scalings. Our numerical
  results are robustly consistent with the mean-field theory.\nThis work sh
 ows the existence of a new critical phase in finite dimensions whose unive
 rsality is strongly connected to the class of jamming universality. This o
 pens new perspectives to study marginally stable glasses and their related
  energy landscapes.\n\n
CATEGORIES:seminars
LOCATION:LPTMS (100% online seminar)\, LPTMS - Bâtiment Pascal n° 530 rue
  André Rivière - Université Paris-Saclay\, Orsay\, 91405\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=LPTMS - Bâtiment Pascal n
 ° 530 rue André Rivière - Université Paris-Saclay\, Orsay\, 91405\, Fr
 ance;X-APPLE-RADIUS=100;X-TITLE=LPTMS (100% online seminar):geo:0,0
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