Accueil > Séminaires
(109) Presentation(s) - Année 2015
Jeu. 30/04/2015 14:00 Petite Ourse, Bâtiment 13, Etage 1 GONZALEZ-ALONSO Martin (IPNL, Lyon) Pseudo-observables in Higgs decays (Théorie des Interactions Fondamentales) We introduce a set of pseudo-observables (PO) characterizing the properties of Higgs decays in generic SM extensions with no new particles below the Higgs mass. The PO represent a systematic generalization of the "kappa-framework" so far adopted by the LHC experiments, providing a useful bridge between data and theory predictions (EFTs or models). We analyze how they can be used to test various dynamical and symmetry hypotheses about the Higgs sector. We discuss the bounds on the Higgs PO implied by EW constraints, under the assumption that the Higgs particle is the massive excitation of an SU(2)L doublet. Using such bounds, detailed predictions for various h->4l observables are presented. --------- Pour plus d'informations, merci de contacter Frigerio M. |
Lun. 11/05/2015 15:00 Andromede, Bâtiment 11, Etage 3 DU ROURE Olivia (ESPCI Paris) Mechanics of dense branched actin networks (Systèmes Complexes et Phénomènes Nonlinéaires) Cell mechanics is fundamental in many cellular processes both in physiological and pathological situations. The actin cytoskeleton is responsible for the main part of this mechanics. In cells, actin filaments are very dynamic polymers spatially organized by many different partners. Rheological studies have been devoted to the understandings of the mechanical properties of actin gels assembled in absence or in presence of actin binding partners showing very interesting behaviors. We developed a new approach based on magnetic particles and the use of the Arp2/3 machinery to assemble and study mechanically actin networks which are close to the ones found in the lamellipodium of a migrating cell. The idea is to use dipolar attractive forces that develops between superparamagnetic micro-sized objects to deform in a controlled way dense branched actin networks grown from the surface of the particles. The main advantage of this technique in the context of biophysics is its high throughput that allows reliable measurements to be performed. We carried out a first study which established the link between elastic properties of these networks and their architecture and give insights into the origin of the elasticity in dense branched actin networks assembled from a mix of purified proteins. We also began to study actin networks assembled from yeast extracts with more than 80 proteins present in the network. This kind of gels shows a strong plasticity which was absent from the purified system. We also developed new particles with flat surfaces that allow non linear measurements to be done and growth under constraints to be followed. These new developments open the ways to study cell mechanics at the scale of isolated cells and even at the scale of a tissue. Pour plus d'informations, merci de contacter Parmeggiani A. |
Mar. 12/05/2015 09:15 Petite Ourse, Bâtiment 13, Etage 1 (à confirmer) JUG Giancarlo (Università di Como) THE GLASSY STATE: INTERMEDIATE-RANGE ATOMIC STRUCTURE MAGNETICALLY VIEWED FROM THE FROZEN END (Physique Statistique) Most studies of the atomic structure of glasses, especially non-metallic ones, are conducted at --------- Pour plus d'informations, merci de contacter Kob W. |
Mar. 12/05/2015 10:30 Bât 21 - 4ième étage ANTHORE Anne (Laboratoire Photonique et Nanostructures) Heat transport in quantum conductors Quantum physics rules electrical and heat transport across low dimensional conductors. Despite thirty years of research in mesoscopic physics, the field of quantum heat transport remains mostly unexplored experimentally, essentially because heat currents are much harder to probe than electrical currents. --------- Pour plus d'informations, merci de contacter Rousseau E. |
Mer. 13/05/2015 10:00 Salle RdC, Bâtiment 11, RdC (à confirmer) JUG Giancarlo (Università di Como) THE GLASSY STATE: INTERMEDIATE-RANGE ATOMIC STRUCTURE MAGNETICALLY VIEWED FROM THE FROZEN END: Part II (Physique Statistique) Most studies of the atomic structure of glasses, especially non-metallic ones, are conducted at --------- Pour plus d'informations, merci de contacter Kob W. |
Mer. 13/05/2015 15:00 Andromede, Bâtiment 11, Etage 3 E.LE BARS, N.MENJOT, F.MOLINO *** (INM & L2C) Projet équipe 'Connectome' (Physique Théorique) [1] François Molino (L2C): situation de l'IRM et du contexte pathologique en neurosciences (20 min) --------- Pour plus d'informations, merci de contacter Moultaka G. |
Lun. 18/05/2015 14:00 4 etage; Bâtiment 21 BASKAR Krishnan (Anna University INDIA) Director, Crystal Growth Centre (UGC-National Facility) MOCVD growth and characterization of nitride semiconductors for photovoltaics (Physique Appliquée) Among the nitride alloy semiconductor structures used in various devices, AlInGaN epilayer can give more freedom in adjusting lattice constants and band gaps independently. The AlInGaN epilayer with an appropriate composition ratio can be grown as lattice matched to InGaN and can be used as electron blocking layer or window layer in solar cells. Therefore, the quaternary AlInGaN is a promising candidate towards enhancing electrical/optical confinement and minimizing mismatch-induced strain at the same time. --------- Pour plus d'informations, merci de contacter Konczewicz L. |
Ven. 22/05/2015 14:00 Andromede, Bâtiment 11, Etage 3 BRANCIARD Cyril (Institut Néel, Grenoble) Séminaire général de physique théorique Does a quantum state represent reality, or just our knowledge of it? (Physique Théorique) The status of the wave function has been the subject of active debates since the very birth of quantum theory. What is it? Does it represent reality, or our knowledge of it? A general framework has recently been developed, allowing one to address these questions formally. In late 2011 Pusey, Barrett and Rudolph (PBR) proved a breakthrough theorem, suggesting that the knowledge interpretation was not tenable [1]. I will review these results and present new developments, showing in particular that the knowledge interpretation cannot (fully) explain the indistinguishability of nonorthogonal quantum states [2]. --------- Pour plus d'informations, merci de contacter Clusel M. |
Ven. 05/06/2015 11:00 Salle RdC, Bâtiment 11, RdC HAYAMIZU Yuhei (JAPON) Engineering of Bio-Nano Interfaces on 2D Nanomaterials by Self-Assembled Peptides (Nanostructures & Spectroscopie) |