Séminaires de l’année 2015

Séminaire du LPTMS: Florian Angeletti

Matrix-correlated random variables: a dialogue between statistical physics and signal processing

Florian Angeletti, National Institute for Theoretical Physics, Stellenbosch

Finding statistical descriptions of non-equilibrium stationary state is often an arduous task. For specific systems, like ASEP or 1D diffusion-reaction systems, stationary solutions have been characterized using matrix product representations. These representations generalize the product structure of independent random variable to matrices; the non-commutativity of matrices generates correlation while preserving many of the algebraic properties of expectation. Depending on the matrix structure, the correlation can vary from short-range to long-range correlation. Moreover, from a signal processing perspective, these matrix-correlated random variables can be recast as specific Hidden Markov Models. In this talk, we propose to investigate the general statistical properties of this mathematical framework, with the long-term hope to improve our understanding of related physical systems. In particular, we shall focus on the statistical properties of sums of such random variables. Do we have a large deviation principle for this sum? Can we find analogous of the law of large number or the central limit theorem?

Tri-séminaire de Physique statistique : Pascal Viot

 Stochastic flow models

Pascal Viot (LPTMC, UPMC)

Filtration, and flow in micro/nano-channels and traffic flow are examples of processes subject to blocking when the channel conveying the particles becomes too crowded. We investigate a concurrent flow model where particles enter a channel randomly. If at any time two particles are simultaneously present in the channel, failure occurs. We obtain the exact solution for the survival probability, the distribution of the number of particles that pass before failure, and the instantaneous flux exiting the channel. Several generalizations of this simple model are also studied. We also consider  a counterflow model with two opposing Poisson streams. There is no restriction on the number of particles passing in the same direction, but blockage occurs if, at any time, two opposing particles are simultaneously present in the passage. All relevant quantities have been obtained exactly.

[1] Non-Markovian Models of Blocking in Concurrent and Countercurrent Flows, A. Gabrielli, J. Talbot and P. Viot Phys. Rev. Lett,  110, 170601 (2013) [2] Stochastic model of single-file flow with reversible blockage, Chloé Barré, Julian Talbot and Pascal Viot EPL, 104 60005 (2013) [3] Irreversible Blocking in Single-File Concurrent and Countercurrent Particulate Flows, J. Talbot, A. Gabrielli  and P. Viot J Stat Mech  to be published (2015)

Physics-Biology interface seminar: Thomas Gibaud

Shape controlled filaments suspensions – rheology and dynamics

Thomas Gibaud (ENS Lyon)

The mechanical behavior of a suspension of rigid and semiflexible filaments has been studied in great detail. In comparison the effect of the filament geometry has been relatively unexplored. Here, we hijack flagellar filaments from their original purpose in order to develop a versatile model rod-like bio-colloid whose shape and length can be tuned. We present experimental results on the rheological behavior of suspensions of (1) straight, (2) curly and (3) semi-straight/semi-curly flagella with an identical average contour length. We find that (1) and (2) show an elastic behavior at intermediate time but that (3) remains elastic and does not flow at long times. Using fluorescence microscopy, we track individual filament and find that this elastic plateau is related to a cage in which the filament is trapped for a certain among of time. Taken together, this highlights the role of filament geometry in suspension mechanics.


Séminaire du LPTMS: Savvas Zafeiropoulos

Chiral Random Matrix Theories for Wilson Fermions

Savvas Zafeiropoulos, Institut für Theoretische Physik - Goethe-Universität Frankfurt

We introduce Random Matrix Models for the Wilson-Dirac operator of Quantum Chromodynamics (QCD) and QCD-like theories. We show that they are equivalent to the epsilon-limit of the chiral Lagrangian for Wilson chiral perturbation theory (WchPT), which is the low energy effective theory describing lattice QCD with Wilson fermions. Results are obtained for the Hermitian Dirac operator of two-color QCD with quarks in the fundamental representation of the color group as well as the non-Hermitian Dirac operator of SU(3) QCD. For the latter case we propose a novel way for the derivation of the Low Energy constants of WchPT. Comparisons of our analytical results with direct numerical simulations of random matrices are shown.

PhDs' days

PhDs' days

Séminaire du LPTMS: Davide Forcella

Electromagnetic properties of viscous charged fluids

Davide Forcella (Université Libre de Bruxelles)

Recently the gauge/gravity correspondence has provided new interesting applications to high energy strongly coupled plasmas and strongly correlated condensed matter systems. At the same time, in an apparently unrelated field, there have been enormous progresses in the ability to engineer electromagnetic devices with exotic properties: such as negative refraction (energy and phase velocity for the electromagnetic field in the medium are in opposite directions), cloaking, photonics black-holes, etc. In the talk, building on these two recent developments, I will discuss the electromagnetic properties of viscous charged fluids, consisting for example of electrons in certain solids or high energy physics plasmas. In particular I will show that finite viscosity leads to multiple modes of evanescent electromagnetic waves at a given frequency, one of which is characterised by a negative index of refraction. I will then underline the concept of electron viscosity in actual electron systems (rarely discussed in literature and not measured in experiments yet) in condensed matter and its consequences on the electromagnetic response. In particular I will discuss how optical spectroscopy can be used to probe the electron viscosity. Indeed finite viscosity has the effect to decrease the reflectivity of a metallic surface, and support the occurrence, in a half-infinite sample, of oscillations of the electromagnetic field intensity as a function of distance from the interface. I will conclude with some comments on future perspectives and applications.

Séminaire du LPTMS : Grigory Astrakharchik

Lieb's soliton-like excitations in harmonic traps

Grigory Astrakharchik (Universitat Politècnica de Catalunya, Barcelona)

We study the solitonic Lieb II branch of excitations the in one-dimensional Bose gas in homogeneous and trapped geometry. Using Bethe-ansatz Lieb's equations we calculate the "effective number of atoms'' and the "effective mass'' of the excitation. The equations of motion of the excitation are defined by the ratio of these quantities. The frequency of oscillations of the excitation in a harmonic trap is calculated. It changes continuously from its "soliton-like'' value $omega_h/sqrt{2}$ in the high density mean field regime to $omega_h$ in the low density Tonks-Girardeau regime with $omega_h$ the frequency of the harmonic trapping. Particular attention is paid to the effective mass of a soliton with velocity near the speed of sound.

G. E. Astrakharchik and L. P. Pitaevskii Lieb’s soliton-like excitations in harmonic traps EPL, 102, 30004 (2013)

Physics-Biology interface seminar: Olivier Rivoire

How history shapes geometry in a model of protein evolution

Olivier Rivoire (Laboratoire interdisciplinaire de Physique, UJF Grenoble)

The interactions between amino acids in a protein are heterogeneous but not arbitrary: they enable proteins to perform specific biochemical "functions". Understanding these interactions may require, however, looking beyond current functional requirements, to the evolutionary history of proteins. I will illustrate this point with a simple statistical mechanics model, which I will motivate with observations and experiments on natural proteins. The model relates the parameters controlling the evolution of a protein to the organization of the interactions inside its structure.

Séminaire du LPTMS: Jonas Ranft

Dynamics of synaptic domains: scaffold-protein aggregation at the postsynaptic membrane

Jonas Ranft, Laboratoire de Physique Statistique de l'ENS

The dynamic nature of synaptic receptor populations poses the question of how the number of receptors can be reliably controlled in spite of their continuous dynamic reorganization. Increasing evidence points to the stabilizing role of submembranous scaffold clusters that are formed by oligomerization of specific proteins. However, it is not clear in turn how these scaffold clusters form, what controls their sizes and what is their lifetime as compared to the protein turnover they are themselves subject to. Here, we investigate the dynamics of synaptic domains by studying a simplified model of the scaffold dynamics at the postsynaptic neuronal membrane. We find by using particle-based simulations, as well as analytic calculations, that for all parameter regimes, the system eventually reaches a non-equilbrium stationary state with a characteristic distribution of cluster sizes. The typical cluster size scales with the turnover rate and depends on how the diffusive mobility of clusters varies with their sizes. Lateral desorption of scaffold molecules can give rise to a critical size below which clusters dissolve, thus favoring a bimodal distribution of synapse sizes. The results provide a basis for the stability of clusters in the face of molecular noise, which is a necessary requirement for long-term memory and learning.

Séminaire du LPTMS: Alexandre Lazarescu

Fluctuations of the current and optimal profiles in the open Asymmetric Simple Exclusion Process

Alexandre Lazarescu, Institute for Theoretical Physics, KU Leuven

The asymmetric simple exclusion process (ASEP), where particles perform biased random walks with hard core repulsion, is one of the most studied model in non-equilibrium statistical physics. It has the mathematical property of being integrable, which makes it a good candidate for in-depth exact calculations. The quantity of particular interest there is the current of particles that flows through the system due to the bias of the jumps. In this presentation, we will see how we can obtain information about the distribution of that current, through various techniques: integrability, macroscopic fluctuation theory, and asymptotic direct diagonalisation. This allows us to build the phase diagram for the large deviations of the current, and examine the corresponding density profiles in each of its five phases. We show that two situations arise: in most phases, the system can be described hydrodynamically, but in one phase, where the current is larger than the limit set by hydrodynamics, the system becomes highly correlated. If time allows it, we will also see how these techniques and results could be generalised to some other observables or models.

Séminaire exceptionnel du LPTMS

The Self-Journal of Science : an ethical and realistic alternative for scientific publishing

Michaël Bon, CEA Saclay

Today, the publication industry hurts Science : extremely high costs, unreliable peer review, Science output decided by self-righteous scientific authorities, addiction to impact factor, chaotic management of the ever-increasing number of papers... Unscientific stakes have a much too big importance in the evolution of Science and outsiders, i.e. younger generations of scientists, are the one who suffer mostly from this situation. I will defend the idea that all these flaws root in the pyramidal organization of scientific edition. I will present a solution which allows theoretically and overall practically to set the system right. It comes in the form a repository (like arXiv) equipped with novel ideas and tools allowing an horizontal self-management of Science by the whole scientific community, to make an optimal peer review as well as an objective and unfalsifiable evaluation of articles. Its social logic makes it always self-regulated towards scientific quality. This new platform, "The Self-Journal of Science" is readily available and just has to be used, as it is free and as its particular nature makes it viral. I therefore welcome all scientist concerned with the global quality and credibility of Science to attend this lecture. Le site du journal : http://sjscience.org/

Physics-Biology interface seminar: Andrew Callan-Jones

The Cytoskeleton as an Active Gel: Modelling Cell Polarization, Shape Change, and Migration

Andrew Callan-Jones (Université Paris-Diderot)

Cell polarization and shape change are required for large-scale movements during embryo development and cancer metastasis. I will present recent work to understand these phenomena by studying two model systems: zebrafish embryos during gastrulation and confined HeLa cells. In both cases, individual cells are observed to undergo a novel type of polarization and transformation to a motile state that is crucially dependent on elevated levels of contractility in the actomyosin cortex. Polarization of zebrafish cells in vitro can be triggered by stimulating myosin activity: initially quasi-spherical, immobile cells switch to a polarized state characterized by a high cortical density at the cell rear, persistent cortical actin flows, and a distinctive pear-like morphology. Compressing HeLa cells between two plates results in a transition from a well-spread, mesenchymal-type migration mode to a rounded-up one sustained by cortical flow, and displaying an actin rich uropod at the rear, reminiscent of zebrafish. We have modeled these cell mechanical responses using active gel theory, a continuum-level description of out-of-equilibrium behavior of the cytoskeleton. In this talk, I will first provide a summary of this theory, and will then show how it accounts for the principal features of contractility-based polarization: cortical flow and density changes, cell shape change, and migration.

Tri-séminaire de Physique Statistique : Camille Aron

Driven-dissipative phyics: the relaxing virtues of a bath

Camille Aron (Princeton University)

Despite being ubiquitous from nano to macroscale, far-from-equilibrium physics remains largely an uncharted territory in which the standard toolbox of equilibrium statistical mechanics is a priori unavailable. Besides its fundamental relevance, nonequilibrium physics can also be viewed as a resource to achieve a new type of control over matter. In this talk, I will review recent developments in our understanding of driven-dissipative physics and illustrate how "bath engineering" offers a promising route to realize exotic many-body states in a nonequilibrium fashion, such as large-scale long-lived quantum entanglement or high-temperature superconductivity.

Séminaire du LPTMS: Stanislao Gualdi

Tipping points and monetary policy in a stylized macroeconomic agent-based model

Stanislao Gualdi, Centrale Supélec

Traditional approaches in economics rely on the assumption that economic agents are identical, non-interacting and rational. Within this framework, economic instabilities would require large exogenous shocks, when in fact small local shocks can trigger large systemic effects when heterogeneities and interactions are taken into account. The need to include these effects motivate the development of agent-based models (ABMs), which are extremely versatile and allow to take into account more realistic behavioural rules. In this talk we introduce a simple ABM, explore the possible types of phenomena that it can reproduce and propose a methodology that characterizes a model through its phase diagram. We then generalize the model with the aim of investigating the role and efficacy of the monetary policy of a central bank. We show that the existence of different equilibrium states of the economy can cause the monetary policy itself to trigger instabilities and be counter-productive.

Séminaire du LPTMS: Andrii Gudyma

Breathing modes of one-dimensional trapped BEC

Andrii Gudyma (LPTMS)

We calculate the breathing mode frequency in a one-dimensional Bose gas confined to a harmonic trap. We predict a smooth crossover from Thomas–Fermi Bose–Einstein condensate (BEC) regime to Gaussian BEC regime using Hartree approximation and sum rules approach, adopted to small system sizes. Local density approximation (LDA) correctly captures the crossover from Tonks-Girardeau to Thomas-Fermi BEC regimes. Hartree and LDA predictions can be continuously matched for N > 25 particles, providing a complete zero-temperature description for large number of particles and resulting in a non-monotonic reentrant behavior of the breathing frequency. For smaller number of particles (ranging from N = 2 to N = 25) we perform extensive diffusion Monte Carlo simulations. This permits us to obtain a complete picture, applicable to arbitrary number of particles and any repulsive interaction strength. We provide perturbative analysis for both weak and strong coupling regimes. We revisit Innsbrick group experiment [Science 325, 1224 (2009)], analyzing the measurements done in Thomas–Fermi Gaussian BEC crossover, and demonstrate that the breathing frequency follows a reentrant behavior as a function of the interaction strength in full agreement with our theory.

Séminaire du LPTMS: Iacopo Mastromatteo

Latent liquidity models: an universal mechanism for the anomalous response of financial markets

Iacopo Mastromatteo, CMAP Ecole polytechnique

Financial markets are remarkable information-processing systems: even though they are driven out-of-equilibrium by long-range correlated forces, they can swiftly remove predictability from their drive and output a diffusive price signal. As empirical results seem to indicate, this is due to anomalous response properties which are to a large extent universal. Yet, the details about the onset of such a peculiar response have not yet been modeled in a fully consistent way. I will first present a general framework in which such universality is justified on the basis of general principles (dimensionality and existence of a price). I will then characterize the response of market to trades (price impact) in a specific reaction-diffusion model which can account for several stylized facts characterizing the microstructure of financial markets.

Tri-séminaire de Physique Statistique: Vincent Hakim

Collective cell motion and statistical mechanics : global modes and fluctuations in confined cell assemblies.

Vincent Hakim (Laboratoire de Physique Statistique, ENS, Paris)

In different biological processes, cells move in a coordinated way. Several experiments have quantitatively investigated this phenomenon. I will describe experimental results obtained by the team of P Silberzan (Institut Curie, Paris) as well as a simple model of interacting persistent random walkers that we have developed to phenomenologically describe collective cell motion. The model helps to explain the observed dynamics of a confined cell assembly which displays stochastic reversals of global rotational motion and pulsatile collective modes.

Séminaire du LPTMS: Cesare Nardini

Non-Equilibrium long-range interacting systems : kinetic theory and large deviations

Cesare Nardini, Edinburgh University

Long-range interacting systems include gravitational systems, plasma in the low density limit, two-dimensional and geophysical fluid models. In many physical contexts, long-range interacting systems are found to be out of equilibrium because of external driving. Examples come from climate dynamics, plasma physics and, recently, experimental setups with cold atoms driven by laser light. Geophysical flows, for example, are characterised by their self-organisation into large-scale coherent structures such as jet-streams, cyclones and anti-cyclones. The description of these structures, of their evolution and of extreme events they undergo (such as the sudden switch of the system between multiple attractors) are outstanding problems at the interface between climate science and statistical mechanics. In order to address the description of driven long-range interacting systems in a theoretical way, we concentrate in this talk on models as simple as possible that still retain the following two main characteristics: non-local (i.e. long-range) nature of the interactions and broken detailed balance (i.e. non-equilibrium dynamics). We present results both for particle systems and quasi two-dimensional flows, and we show that their dynamics can be described very accurately in the limit where there is a separation of time scales between the evolution of the mean state and the evolution of the fluctuations around it. The main theoretical tools developed are kinetic theory and large deviations techniques: the accuracy of the results obtained will be compared to direct numerical simulations. Ongoing work and perspectives on a combination of kinetic theory and large deviations theory to describe multistability in a very performant way will also be described.

Séminaire du LPTMS: Sergej Moroz

Few- and many-body quantum physics of p-wave interacting fermions in two dimensions

Sergej Moroz, University of Colorado, Boulder

Due to the current search of Majorana fermions, the quantum physics of two-dimensional identical fermions with short-range p-wave interactions is of immediate interest. In the first part of the seminar, I will talk about the effective theory of a chiral p+ip fermionic superfluid at zero temperature. This theory naturally incorporates the parity and time reversal violating effects such as the Hall viscosity and the edge current. In the second part, I will concentrate on the few-body physics near a p-wave resonance and introduce the super Efimov effect- a new type of few-body universality manifesting itself by a tower of three-body bound states with a double-exponential scaling.

Physics-Biology interface seminar: Arezki Boudaoud

Stochasticity and robustness in growth and morphogenesis

Arezki Boudaoud (ENS Lyon)

How do organisms cope with natural variability to achieve well-defined morphologies and architectures? We addressed this question by combining experiments with live plants and analyses of stochastic models that integrate cell-cell communication and tissue mechanics. This led us to counterintuitive results on the role of noise in development, whereby noise is either filtered or enhanced according to the level at which it is acting.

Séminaire du LPTMS: Erik Sorensen

Dynamics at a Quantum Critical Point: Combining Quantum Monte Carlo and Holography

Erik Sorensen, LPT Toulouse

The real time dynamics near quantum critical points have proven very challenging to obtain both from a numerical and analytical perspective. Here we focus on the superfluid-insulator transition occurring for bosons on a lattice. New large-scale QMC results have made it possible to obtain very precise results for many quantities in particular the frequency dependent conductivity at imaginary frequencies.  Since the numerical results remain confined to imaginary times/frequencies additional tools are needed to extend the results to the rest of the complex plane. Here, recent insights from conformal field theory and holography have yielded a wealth of information that combined with the QMC results yield quantitative and experimentally testable results for the frequency-dependent conductivity near the quantum critical point.

Séminaire exceptionnel : Pierre Charles (UPMC)

Pensée antique et science contemporaine

Pierre Charles (UPMC)

La science contemporaine nous amène à reconsidérer certains textes anciens. La mécanique quantique, tout particulièrement, utilise de nombreux concepts que l’on retrouve dans les philosophies de Pythagore, Héraclite, Platon, Aristote et Carnéade. Les théories modernes du langage et de la signification, la nature des nombres et des propositions logiques, nous offrent l’opportunité d’une confrontation.

Séminaire du LPTMS: Vincent Michal

Many-body physics of bosons in (quasi)disorder

Vincent Michal (LPTMS)

Anderson's localization was introduced more than fifty years ago in the context of single-particle physics: the eigenstates of the Shrödinger equation with a random potential may be localized in space leading to the absence of particle transport. It was realized quite recently that the localization idea is actually much more general and applies to a variety of situations. This program was put forward to solve the problem of electron lifetime in a quantum dot and lead to the discovery of the many-body localization physics (Anderson localization in the many-body Fock space). In the solid state context this approach has proven to be very useful to tackle the long-standing problem of the transport of interacting localized single-particle states in the absence of phonons. This gave rise to the demonstration of the energy threshold between the insulating and metallic regimes [1]. The physics of interacting bosons [2] is also very interesting particularly in connection with ongoing experiments on cold atomic gases. In this seminar I would like to show to you very recent results on the finite-temperature fluid-insulator transition of bosons in one dimension (1D). On the one hand I will present the case of the quasiperiodic potential (superposition of two incommensurate periodic potentials) and give predictions regarding the transport phase diagram including the unexpected freezing with heating behaviour [3]. On the other hand I will talk about the transport of strongly-interacting 1D bosons in the random potential and I will show the reentrance of the insulating state at strong interaction, hence completing the transport phase diagram of interacting disordered bosons at finite temperature [4]. References: [1] D.M. Basko, I.L. Aleiner, and B.L. Altshuler, Metal–insulator transition in a weakly interacting many-electron system with localized single-particle states, Annals of Physics 321, 1126 (2006). See references therein. [2] I. L. Aleiner, B. L. Altshuler, and G. V. Shlyapnikov, A finite-temperature phase transition for disordered weakly interacting bosons in one dimension, Nature Physics 6, 900 (2010). [3] V.P. Michal, B.L. Altshuler and G.V. Shlyapnikov, Delocalization of Weakly Interacting Bosons in a 1D Quasiperiodic Potential, Phys. Rev. Lett. 113, 045304 (2014). [4] V.P. Michal, I.L. Aleiner, B.L. Altshuler, G.V. Shlyapnikov, Finite-Temperature Fluid-Insulator Transition of Strongly Interacting 1D Disordered Bosons, arXiv:1502.00282.

Soutenance d'HDR: Olivier Giraud

Critical systems and quantum multifractality

Séminaire du LPTMS : Victor Yakovenko

Economic inequality from statistical physics point of view

Victor Yakovenko (Department of Physics, University of Maryland, College Park, USA)

Similarly to the probability distribution of energy in physics, the probability distribution of money among the agents in a closed economic system is also expected to follow the exponential Boltzmann-Gibbs law, as a consequence of entropy maximization. Analysis of empirical data shows that income distributions in the USA, European Union, and other countries exhibit a well-defined two-class structure. The majority of the population (about 97%) belongs to the lower class characterized by the exponential ("thermal") distribution. The upper class (about 3% of the population) is characterized by the Pareto power-law ("superthermal") distribution, and its share of the total income expands and contracts dramatically during booms and busts in financial markets. Globally, data analysis of energy consumption per capita around the world shows decreasing inequality in the last 30 years and convergence toward the exponential probability distribution, in agreement with the maximal entropy principle. Similar results are found for the global probability distribution of CO2 emissions per capita. All papers are available at http://physics.umd.edu/~yakovenk/econophysics/. For recent coverage in Science magazine, see http://www.sciencemag.org/content/344/6186/828

Séminaire du LPTMS : Alexey Sossinsky

Energetic reduction of elastic knots to normal form: Gradient descent along the Euler functional

 Alexey Sossinsky, Independent University of Moscow, Laboratoire Poncelet

Simple physical experiments show that a deformed knotted resilient elastic wire always returns to its equilibrium shape (which we call the normal form of the wire knot). The aim of this research (joint work with S.Avvakumov and O.Karpenkov) is to construct a mathematical model of such physical knots. This is done by supplying the space of knots with an energy functional and performing gradient descent w.r.t. the functional. The energy functional that we use is the sum of the Euler functional (the integral along the curve defining the knot of the square of the curvature) and a simple repulsive functional (that forbids crossing changes). Using a discretized version of gradient descent along that functional, we construct an algorithm that brings the knot to the shape that minimizes its energy. The algorithm is implemented in a computer animation that shows the isotopy bringing the knot to normal form. We will show some of these animations and demonstrate a few of the physical experiments with wire knots, compare the results of physical and mathematical experiments, and outline how our algorithm can be used in practice to recognize knots and to unravel trivial knots.

Physics-Biology interface seminar: Gerald G. Fuller

The Dynamics of Two Biological Interfaces

Gerald G. Fuller (Stanford University)

Seminar co-hosted by Éric Raspaud—SPECIAL TIME

Biological systems are normally high-interface systems and these surfaces are laden with biological molecules and cells that render them mechanically complex. The resulting nonlinearities with response to surface stresses and strain are often essential to their proper function and these are explored using recently developed methods that reveal an intricate interplay between applied stress and dynamic response. Two applications are discussed.

1. Vascular endothelial cells are nature's "rheologists" and line the interior walls of our blood vessels and are sensitive to surface shear stresses. These stresses are known to affect the shape and orientation of endothelial cells. It is evident that the spatial homogeneity of flow can affect vascular health and it is well-documented that lesions form in regions of high curvature, bifurcations, and asperities in blood vessels. Experiments are described where stagnation point flows are used to create regions of well controlled flow stagnation and spatial variation of wall shear stresses. Live-cell imaging is used to monitor the fate of cells attached to surfaces experiencing flow impingement and it is revealed that endothelial cells migrate and orient in such flows to create remarkable patterns of orientation and cell densification. This response, termed "rheotaxis", is used to explore mechano-transduction pathways within these cells.

2. The tear film of the eye is a composite structure of an aqueous solution of protein and biomacromolecules. This thin layer is further covered by a film comprised of meibomian lipids excreted during each blink. The purpose of the meibum has been largely unexplained although one prevailing suggestion is that it suppresses evaporation. Recent measurements in our laboratory demonstrate that this layer is strongly viscoelastic and this property has dramatic effects on the dynamics of the moving contact line and stability against dewetting.

Gerald Fuller is the Fletcher Jones Professor of Chemical Engineering at Stanford University. He joined Stanford in 1980 following his graduate work at Caltech where he acquire his MS and PhD degrees. His undergraduate education was obtained at the University of Calgary, Canada. Professor Fuller's interests lie in studies of rheology and interfacial fluid mechanics. His work has been recognized by receipt of the Bingham Medal of The Society of Rheology, membership in the National Academy of Engineering, and honorary doctorates from the Universities of Crete, Greece, and Leuven, Belgium.

Tri-séminaire de Physique Statistique : Amir Dembo

Matrix optimization under random external fields

Amir Dembo, Stanford University

Consider the problem of maximizing the quadratic form <x,Wx> + <h,x> over unit norm n-dimensional vectors x, where W is a Wigner matrix which is independent of the Gaussian vector h whose entries are independent and identically distributed. Two recent studies of the large n asymptotic probability of deviations of such maximum from its typical value, take very different approaches. Fyodorov and Le Doussal (2014) use the replica method of statistical physics, whereas Dembo and Zeitouni (2015) rely instead on the mathematical theory of large deviations. I will describe the main points of the latter, using this specific example also to illustrate some of the differences, strength and weaknesses of each approach.

Séminaire du LPTMS: Alfredo Ozorio de Almeida

Semiclassical evolution of correlations between observables

Alfredo Ozorio de Almeida, Centro brasileiro de pesquisas físicas

The kernel for the evolution of multiple quantum correlations between observables within the Weyl representation can be mapped onto the trace of a single continous family of compound unitary operators. Thus the semiclassical limit of this kernel can be ascribed to the periodic orbits of a corresponding family of classical compound canonical transformations, in the celebrated manner of Gutzwiller. Breaking these periodic orbits, leads to an initial value alternative that avoids both the search for orbits and singularities at caustics or bifurcations.

Physics-Biology interface seminar: Stephan Grill

Actomyosin Force Generation and Pattern Formation

Stephan Grill (MPI-CBG Dresden)

Morphogenesis is one of the great unknowns in Biology. Much is known about molecular mechanisms of regulation, but little is known about the physical mechanisms by which an unpatterned blob of cells develops into a fully structured and formed organism. The actomyosin cortex is a thin layer underneath the cellular membrane that can self contract, which drives many of the large-scale morphogenetic rearrangements that are observed during development. How this cortex reshapes and deforms, and how such morphogenetic processes couple to regulatory biochemical pathways is largely unclear. I will discuss two emergent physical activities of the actomyosin cytoskeleton, an active contractile tension and an active torque, both of which can serve to drive flows and large-scale chiral rotations of the actomyosin cytoskeleton. I will illustrate how active tension drive flows, how molecular constituents of the cortex affect flows, and how morphogenetic patterns can be formed by coupling regulatory biochemistry to active cortical mechanics. A particular focus will be the investigation of how compressive cortical flow drives the formation of an actin filament alignment pattern for generating a cleavage furrow for cytokinesis.

Tri-Séminaire de Physique Statistique : Balázs Kégel

Learning to discover: signal/background separation and the Higgs boson challenge

Balázs Kégel (Laboratoire de l'Accélérateur Linéaire, Univ. d'Orsay)

Classification algorithms have been routinely used since the 90s in high-energy physics to separate signal and background in particle detectors. The goal of the classifier is to maximize the sensitivity of a counting test in a selection region. It is similar in spirit but formally different from the classical objectives of minimizing misclassification error or maximizing AUC. We start the talk by motivating the problem on an ongoing example of detecting the Higgs boson in the tau-tau decay channel in the ATLAS detector of the LHC. We formalize the problem, then go on by describing the usual analysis chain, and explain some of the choices physicists make when designing a classifier for optimizing the discovery significance. We derive different surrogates that capture this goal and show some simple techniques to optimize them, raising some questions both on the statistical and on the algorithmic side. We end the talk by presenting a data challenge we organized to draw the attention of the machine learning and statistics communities to this important application and to improve the techniques used to optimize the discovery significance. With a PhD in computer science, Balázs Kégl has been a researcher in the Linear Accelerator Laboratory of the CNRS and the chair of the Center for Data Science of the Université Paris-Saclay since 2014. He has published more than hundred papers on unsupervised and supervised learning, large-scale Bayesian inference and optimization, and on various applications. At his current position he has been the head of the AppStat team working on machine learning and statistical inference problems motivated by applications in high-energy particle and astroparticle physics.

Séminaire du LPTMS: Antoine Sterdyniak

Realization of strongly interacting topological phases on lattices

Antoine Sterdyniak, Universität Innsbruck

While fractional quantum Hall effect (FQHE) was realized experimentally thirty years ago in semiconductor heterostructures, strongly interacting chiral topological phases are still at the center of an important research effort, both as they serve as building blocks of more exotic phases such as fractional topological insulators and as a realization outside of semi-conductor physics is still missing. In this talk, I will describe realizations of these phases in cold atoms gases and in frustrated spins systems. I will first introduce optical flux lattices, which are continuous models that exhibit topological flat bands with a tunable Chern number and host fractional states beyond the FQHE. Then, I will focus on chiral spin liquids whose emergence on the kagomé lattice using local Hamiltonitrouhas been tecn Paris-Saclaorg/exhibit topological f I wPBinrong>6, 900 (201TMS: Er/seminars/physics--hich we call treversals of global riurrentEr/semize exoto such lize exlfion ofern number abtext-ting state at o non modelf part do noust regirrelats phy kagomé latticeand hefrequgy thatt where thereb anomaletary polnada. Pruescent sl high ATLA:none" item="url">http://lptms.u-psud.fr/seminars/seminaire-du-lptms-andrii-gudyma/

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Séminaire du LPTMS : Alexey Sossinsky

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Séminaire du LPTMS: Antoine Sterdyniak

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Séminaire du LPTMS: Alfredo Ozorio de Almeida

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Physics-Biology interface seminar: Stephan Grill

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Séminaire du LPTMS: Alfredo Ozorio de Almeida

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Séminaire du LPTMS: Antoine Sterdyniak

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Sem23asticity and robustness in growth a2>

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Séminaire du LPTMS: Antoine Sterdyniak

Sem30asticity and robustness in growth a2>

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Séminaire du LPTMS : Alexey Sossinsky

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  • Séminaire du LPTMS: Antoine Sterdyniak

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    Tri-séminaire de Physique Statistique : Amir Dembo

    Séminaire du LPTMS: Antoine Sterdyniak


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    Séminaire du LPTMS: Antoine Sterdyniak

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