Even though the LHC searches so far did not unveil the new physics particles, the B-physics experiments at LHCb, BaBar and Belle hint towards deviations from Lepton Flavor Universality in both the tree-level and loop-induced B meson semileptonic decays. I will briefly review the models that can address these puzzles, propose one new model and discuss the main predictions that can be tested at LHCb and/or Belle-II. Particular emphasis will be given to Lepton Flavor Violation in B meson decays, which
offer a very clean alternative to test the proposed New Physics scenarios.

If a liquid is cooled fast enough, it is possible to avoid the phase transition towards a crystalline solid, and the system enters a metastable state, called supercooled liquid. If the cooling continues, the viscosity and the relaxation times grow so steeply that the system becomes effectively solid, even though the system did not undergo any thermodynamic phase transition. Such a solid is called a glass. Glassy materials appear in both in everyday life and in high-tech devices. Further, many systems in biology, computer science and mathematics also exhibit a glassy behavior. In this talk, we try to understand the mechanisms underlying the rigidity of glasses. In phase space, the dynamics of such systems can be regarded as a random walk in a high-dimensional energy landscape. This landscape is rugged, so in order to sample new configurations the system must 'hop' over an energy barrier from one local minimum (basin) to another. This type of process is called activation. We adopt a bottom-up strategy to understand this phenomenon. We start from the simplest models, attempt to fully characterize the behavior of their random walk in phase space, and only then add features representing more realistic glasses. We analyze three paradigmatic mean-field models: the Trap Model, the Random Energy Model (REM) and the p-spin model. In particular, in the REM, we see that despite the motion in configuration space is complex on intermediate time-scales, there is a very large separation of time scales that washes out correlations induced by the exploration of the landscape. As a result, by coarse-graining the dynamical evolution in terms of basins of the energy landscape, the dynamics can be effectively described through a hopping between disconnected traps. This type of description is not applicable anymore in systems with a higher degree of correlation in the energy landscape, such as the p-spin model, where the energy landscape exhibits large basins which are connected one to the other through non-trivial boundaries.

Identifying the material time in physical aging by Jeppe Dyre, followed by Self-assembly of active amphiphilic Janus particles by Chantal Valeriani

In this talk I will mainly present a series of experimental results regarding the dynamics of passive particles in liquid bath of active ones. The active particles act here, via the flows they generate, as localized and erratic sources of momentum for the passive beads leading to non-trivial dynamics. Beyond their exciting features for the physicist, active/passive systems are worth studying quantitatively for applications as diverse as the transport of passive entities in cells, biogenic mixing (i.e. mixing of the ocean by living creatures), virus infection, cargo transport (e.g. drug delivery) or self-assembly (e.g. via motility-induced phase separation). The model system I consider is composed of the motile micro-alga Chlamydomonas reinhardtii, a model organism at numerous levels, and polystyrene beads. I will first present results about the diffusive dynamics of micron-size spheres in homogeneous suspensions of algae. I will then show how the coarse-grained dynamics is related to the near-field hydrodynamics of the swimming organism. Finally I will talk about recent results regarding systems of large colloids in spatially heterogeneous suspensions of algae and show how our findings could be (perhaps) put at stake to actually perform useful tasks.

In my previous research works, I studied with molecular modeling various materials, porous or not, either porous clays or silica surfaces, porous electrodes of supercapacitors and carbon or boron nitride nanotubes. For all the projects, one leitmotif has always been to work with experimentalists or compare the results to experimental data ; for example, electrochemical experiments for supercapacitors, or infrared spectroscopy for adsorption on silicas. Depending on the problematics, the materials were studied at multiple scales, either by quantum chemistry, Monte Carlo or molecular or brownian dynamics. I will present some key results, pointing out the dynamics of molecules in porous media and the adsorption at the quantum scale.

Light-matter interactions lie at the heart of a very broad range of fundamental physics and applications. At a single particle level, such interactions enable all-optical quantum control of qubits which is of great interest for quantum information. At a more macroscopic level, these interactions are a key to collective phenomena such as condensation of exciton-polaritons in microcavities. In this talk I will present my previous and current research which is unified under the broad field of light-matter interactions in semiconductors. In particular, I will briefly introduce polariton condensates along with the typical experimental methods used for their study and will cover a few exciting experiments ranging from the observation of pinned singly-charged vortices to the demonstration of a polaritonic Josephson junction. Moving from such collective quasi-particle phenomena to the investigation of more discreet quantum emitter systems, I will then address experimental efforts on the coherent control of scalable quantum emitter platforms. More specifically, I will present recent work on site-controlled quantum dots and silicon vacancies in diamond, and will conclude with an overview of my vision for future research.