So far LHC has found only a relatively light Higgs boson with mass mh=126 GeV and no beyond-SM particle has appeared yet below the TeV. Likewise, there have been no significant deviations in the interaction couplings with respect to the expected SM values. EW chiral Lagrangians are found to be, therefore, a natural and systematic approach for the study of this type of scenarios. However, due to the tight constraints from LHC data, one needs to go beyond the leading order approximation in order to disentangle possible new physics. This is, full one-loop effects must be computed and handled in a systematic way; tree-level phenomenological estimates are simply not accurate enough and miss crucial contributions. More specifically, I will discuss the one-loop calculation of the oblique S and T parameters within strongly-coupled models. First we will extract their expressions at next-to-leading order in a generic low-energy theory. In a second step, we will look at the particular predictions that arise in strongly-coupled models with resonances. On the contrary to a widely spread believe, we demonstrate that strongly coupled EW models with massive resonances are not in conflict with the experimental S and T and the recently discovered Higgs-like particle as far as the masses of the new vector and axial-vector resonance lie above the TeV scale and the hWW coupling remains close to the Standard Model one. All through the talk we will employ usual QCD tools such as effective chiral Lagrangians and dispersion relations.

The analysis of the XXZ open spin chain within the framework of an Onsager's approach will be presented. Starting from the finite size model, the thermodynamic limit will be considered. The transfer matrix - expressed in terms of \(O_q(\widehat{sl}_2)\) \(q-\)Onsager algebra's currents - is diagonalized in the massive regime using level one infinite dimensional representations (\(q-\)vertex operators) of \(U_q(\widehat{sl}_2)\) for (i) diagonal boundary conditions, in which case results of Jimbo et al. are recovered; (ii) triangular boundary conditions. In this latter case, integral representations for correlation functions and form factors are derived. As a byproduct, a summation formula for the expectation values \(<\sigma_a>\), \(a=x,y,z\) is obtained for the first time as well as identities among \(n-\)fold multiple integrals of theta functions. In this approach, the long-standing question of the hidden non-Abelian symmetry of the model is solved. Finally, open problems such that the root of unity case will be briefly presented. Work done in collaboration with S. Belliard (arXiv:1211.6304v2), T. Kojima (arXiv:1309.7785 + in prep.).

The dynamics of glass-forming liquids is heterogeneous and display spatial correlations that grow on approaching the glass transition temperature. Whether such dynamic heterogeneities arise from heterogeneities of the local structure or more complex forms of amorphous static order is a highly debated question in the glass community. I will report simulation results that show that the correlation between local structure and dynamic heterogeneity is strongly system dependent. I will argue that the strength of this correlation depends on how closely a given liquid conforms to "mean-field" behaviour.

In supercooled liquids an effective temperature Teff can be defined through the fluctuation-dissipation relation, when the system is brought off-equilibrium in the glassy phase by a sudden temperature quench. We performed a study of a binary mixture of homonuclear Lennard- Jones dumbbells in and out of equilibrium, measuring Teff by perturbing both translational and rotational degrees of freedom, in order to investigate whether or not there is a Teff dependence on the observable chosen. For this purpose, we developed a code to perform Metropolis Monte Carlo simulations in the canonical ensemble. Moreover we implemented an efficient algorithm for measuring correlations and response functions under aging conditions. We performed our study at different elongations ζ of the molecules. Starting from ζ = 0.5 we found that the effective temperature of the rotational and translational degrees of freedom is the same. This occurs for a number of elongations above a critical elongation ζc that determines the transition from a strong steric hindrance scenario to a weak steric hindrance scenario. Below this critical elongation (ζ < ζc) we observed that the possibility to describe the system with only an effective temperature for both rotations and translations is quench-dependent.

The Fisher equation describes the spread of a population or the spread of an advantageous gene through a population. It is well known as a simple nonlinear equation which exhibits travelling wave solutions. Within statistical physics It has played a major role in our understanding of phase ordering dynamics and random first order phase transitions. In this talk we review the selection mechanism for the speed of the travelling waves which was established some time ago. We go on to consider two coupled Fisher equations representing two populations e.g. sub-populations of bacteria which are susceptible or resistant to antibiotic. We show that a subtle coupling between two population waves gives rise to a novel speed selection mechanism.

La texture de l’albumen de blé tendre (Triticum aestivum) est une propriété importante du grain qui affecte son comportement au fractionnement, ainsi que la qualité des produits finis. Elle est définie par la dureté et la vitrosité qui sont deux propriétés différentes du blé. La dureté est reliée à l’adhésion entre les granules d’amidon et la matrice protéique (principaux constituants de l’albumen) qui est contrôlée génétiquement à travers l’état des puroindolines (sauvages ou mutées). La vitrosité est associée à la porosité de l’albumen et varie principalement en fonction des conditions de culture. Le principal objectif de ce travail de recherche est de contribuer à la compréhension du lien entre la texture de l’albumen et le comportement des grains à la mouture, en fonction de la génétique (puroindolines) et des conditions de culture (porosité). La microscopie à force atomique (AFM) a été utilisée pour mesurer les propriétés mécaniques locales de l’amidon, des protéines et de l’interface amidon/protéines. En l’associant avec un modèle de tribologie, nous avons montré, pour la première fois, que la dureté de l’amidon est quatre fois plus élevée que celle du gluten, indépendamment de leur origine génétique. Nous avons aussi montré pour la première fois que les propriétés mécaniques de l’interface entre amidon et protéines étaient dépendantes de l’origine génétique des blés, et plus précisément des puroindolines. Ces résultats confirment que la dureté du grain n’est pas liée aux propriétés mécaniques des constituants du blé mais plutôt à l’interface amidon-protéines. Ces données ont été intégrées par la suite dans un modèle numérique qui permet de prédire le comportement mécanique global des échantillons en fonction du degré d’adhésion entre amidon et protéines, l’assemblage granulaire des particules d’amidon et la teneur en protéines. Ce modèle a permis de mettre en évidence l’effet de l’assemblage des granules d’amidon sur les propriétés mécaniques, qui a été jusqu’ici négligé dans l’évaluation de la vitrosité. Mots clés : Blé tendre (Triticum aestivum), texture, dureté, vitrosité, amidon, protéines, puroindolines, analyse multi-échelles, AFM, propriétés mécaniques, fractionnement, modélisation numérique

Actin is a major protein of the cytoskeleton which takes part into many cell processes like cell division, migration, morphogenesis… For example, in response to migration signaling, the cell induces the polymerization of an actin branched network towards the plasma membrane. This growing network exerts a pushing force against the membrane, leading to cell protrusion, the first step of cell migration. This process requires a tight regulation of the actin network in time and space. Such complexity has raised interest from both physics and biology communities, thus leading to studies combining interdisciplinary approaches. Here, I will describe two studies showing the versatile function of a specific actin structure, the actin branched network generated by the Arp2/3 complex, depending where actin assembly is triggered. In a first part, I will show an in vitro approach in which we reconstituted the branched actin array at the surface of giant unilamellar vesicles (GUVs) by anchoring an actin activator to the GUV surface. The growth of the actin network from the GUV surface induces GUV propulsion. Our macroscopic observations of actin-propelled GUVs shed light on molecular details of the mechanism of actin-based motility. We showed that efficient continuous propulsion is due to the right balance between the free diffusion of the actin activator at the GUV surface and its segregation while it is transiently interacting with the actin network, a balance which is controlled by the Arp2/3 complex [1]. In a second part, I will describe a cell biology approach in which analyzed the role of actin in intracellular transport. We studied the distribution of the actin activator on endosomal membranes, the WASH complex. Our observations suggest that actin contributes to the dynamic exchange of the activator between the cytosol and the endosomes. Moreover, we showed that actin polymerization regulates the organization of WASH into small and discrete domains at the surface of endosomes. Our data suggest a potential role of actin in proteo-lipidic domain compartmentalization of endosomes, a precursor step to endosomal sorting [2]. [1] Arp2/3 controls the motile behavior of N-WASP-functionalized GUVs and modulates N-WASP surface distribution by mediating transient links with actin filaments. V. Delatour*, E. Helfer*, D. Didry, K. H. D. Lê, J.-F. Gaucher, M.-F. Carlier, G. Romet-Lemonne. Biophys. J. 94, 4890-4905 (2008) [2] Actin polymerization controls the organization of WASH domains at the surface of endosomes. E. Derivery*, E. Helfer*, V. Henriot, A. Gautreau. PLoS One 7, e39774 (2012)

Even if theoretically discovered long ago, the dilaton, the Goldstone-boson of spontaneous breaking of scale (conformal) invariance, is still subject of active investigations. These not only concern its theoretical applications, such as the a-theorem in four dimensions, but also phenomenological ones. In this talk I will review some of the potential manifestations of the dilaton in Nature: at the electroweak scale in relation to the recently discovered Higgs-like particle, and in cosmology owing to its connection with the energy of the vacuum.

A very interesting quantity that can be measured in the simulations of atomistic models of supercooled liquids is the free energy cost V(q) to keep two configurations at a given distance in phase space, namely at a given overlap "q". In my talk I will illustrate one of the techniques that can be used to measure numerically the thermodynamic potential V(q), and how we applied it to a 3d system of particles interacting via a modified Lennard-Jones potential. In particular I will discuss how from V(q) we extracted the amorphous surface tension, a quantity which, according to the Random First-Order Transition theory for the glass transition, is a master piece in the thermodynamic description of supercooled liquids. I will also show how the numerical study of correlations functions like < V(q) V(q') > gives us a direct way to test one of the most intriguing assumptions on the thermodynamics of supercooled liquids, i.e. the presence of some "self-induced" disorder in the low temperature phase.