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Pulses from a mid-infrared quantum cascade laser frequency comb using an external compressorMay 14 2019A Martinez-type stretcher-compressor is used to modify the spectral phases of a high-power (~1 W) QCL comb emitted at 8.2 {\mu}m with more than 100 cm-1 spectral bandwidth. Using this scheme, we demonstrate a compression of the QCL output from a 134 ps ... More

Coexisting frequency combs spaced by an octave in a monolithic quantum cascade laserOct 24 2018Quantum cascade lasers are proving to be instrumental in the development of compact frequency comb sources at mid-infrared and terahertz frequencies. Here we demonstrate a heterogeneous terahertz quantum cascade laser with two active regions spaced exactly ... More

Intersubband gain in a Bloch oscillator and Quantum cascade laserMay 17 2002The link between the inversion gain of quantum cascade structures and the Bloch gain in periodic superlattices is presented. The proposed theoretical model based on the density matrix formalism is able to treat the gain mechanism of the Bloch oscillator ... More

Coherent Frequency Combs produced by Self Frequency Modulation in Quantum Cascade LasersNov 28 2013One salient characteristic of Quantum Cascade Laser (QCL) is its very shor gain recovery time that so far thwarted the attempts to achieve self-mode locking of the device into a train of single pulses. We show theoretically that four wave mixing, combined ... More

High quality factor, fully switchable THz superconducting metasurfaceNov 13 2014We present a complementary THz metasurface realised with Niobium thin film which displays a quality factor Q=54 and a fully switchable behaviour as a function of the temperature. The switching behaviour and the high quality factor are due to a careful ... More

Softening of cavity cyclotron polariton modes in strained germanium 2D hole gas in the ultra-strong coupling regimeAug 25 2017Aug 20 2018We probe ultra-strong light matter coupling between metallic terahertz metasurfaces and Landau- level transitions in high mobility 2D electron and hole gases. We utilize heavy-hole cyclotron res- onances in strained Ge and electron cyclotron resonances ... More

InGaAs/AlInGaAs THz Quantum Cascade Lasers operating up to 195 K in strong magnetic fieldNov 06 2014Feb 20 2015Terahertz quantum cascade lasers based on InGaAs wells and quaternary AlInGaAs barriers were measured in magnetic field. This study was carried out on a four quantum well active region design with photon energy of 14.3 meV processed both with Au and Cu ... More

Intrinsic linewidth of quantum cascade laser frequency combsJun 20 2015The frequency noise power spectral density of a free-running quantum cascade laser frequency comb is investigated. A plateau is observed at high frequencies, attributed to the quantum noise limit set by the Schawlow-Townes formula for the total laser ... More

Mid-Infrared Single Photon CountingNov 29 2005We report a procedure to detect mid-infrared single photons at 4.65 um via a two-stage scheme based on Sum Frequency Generation, using a Periodically Poled Lithium Niobate (PPLN) nonlinear crystal and a Silicon Avalanche Photodiode. An experimental investigation ... More

Measuring intensity correlations of a THz quantum cascade laser around its threshold at sub-cycle timescalesNov 29 2016The quantum nature of photonic systems is reflected in the photon statistics of the light they emit. Therefore, the development of quantum optics tools with single photon sensitivity and excellent temporal resolution is paramount to the development of ... More

Hitting time statistics for observations of dynamical systemsApr 01 2014Jul 24 2014In this paper we study the distribution of hitting and return times for observations of dynamical systems. We apply this results to get an exponential law for the distribution of hitting and return times for rapidly mixing random dynamical systems. In ... More

C^r surface diffeomorphisms with no maximal entropy measureMay 18 2012For any $1\leq r<\infty$, we build on the disk and therefore on any manifold, a $C^r$-diffeomorphism with no measure of maximal entropy.

Numerical Relativity CM1-a and CM1-b sessionsFeb 05 2001Feb 13 2001Numerical Relativity is concerned with solving the Einstein equations, as well as any field or matter equations on curved space-time, by means of computer calculations. The methods developed for this purpose up to now, as well as the addressed physical ... More

Ice : The paradigm of wild plasticityFeb 14 2019Ice plasticity has been thoroughly studied, owing to its importance in glaciers and ice sheets dynamics. In particular, its anisotropy (easy basal slip) has been suspected for a long time, then fully characterized 40 years ago. More recently emerged the ... More

Pure braids, a new subgroup of the mapping class group and finite type invariantsDec 03 1997In the study of the relation between the mapping class group M of a surface and the theory of finite-type invariants of homology 3-spheres, three subgroups of the mapping class group play a large role. They are the Torelli group, the Johnson subgroup ... More

Existence and uniqueness of optimal maps on Alexandrov spacesMay 03 2007The purpose of this paper is to show that in a finite dimensional metric space with Alexandrov's curvature bounded below, Monge's transport problem for the quadratic cost admits a unique solution.

The timescale for giant planet formation : constraints from the rotational evolution of exoplanet host starsOct 17 2008The timescale over which planets may form in the circumstellar disks of young stars is one of the main issues of current planetary formation models. We present here new constraints on planet formation timescales derived from the rotational evolution of ... More

Inflation: Where Do We Stand?Oct 26 2004In this short review, the predictions of inflation are presented and compared to the most recent measurements of the Cosmic Microwave Background (CMB) anisotropy. It is argued that inflation is compatible with these observations but that these ones are ... More

The Theory of InflationJul 29 2018This article contains a concise review of the theory of inflation. We discuss its main theoretical aspects as well as its observational predictions. We also explain how the most recent astrophysical observations constrain the inflationary scenario.

Gravity, Dimension, Equilibrium, & ThermodynamicsMar 30 2006Is it actually possible to interpret gravitation as space's property in a pure classical way. Then, we note that extended self-gravitating system equilibrium depends directly on the number of dimension of the space in which it evolves. Given those precisions, ... More

The Lagrangian filtration of the mapping class group and finite-type invariants of homology spheresAug 23 2004In a recent paper we defined a new filtration of the mapping class group--the "Lagrangian" filtration. We here determine the successive quotients of this filtration, up to finite index. As an application we show that, for any additive invariant of finite-type ... More

Finite, closed-form expressions for the partition function and for Euler, Bernoulli, and Stirling numbersMar 08 2011May 24 2011We find general solutions to the generating-function equation sum c_q^{(X)} z^q = F(z)^X, where X is a complex number and F(z) is a convergent power series with |F(0)| >0. We then use these results to derive finite expressions containing only integers ... More

Towards a Science of MindNov 06 2018Apr 26 2019The ancient mind/body problem continues to be one of deepest mysteries of science and of the human spirit. Despite major advances in many fields, there is still no plausible link between subjective experience (qualia) and its realization in the body. ... More

Mysteries of Visual ExperienceApr 28 2016Mar 20 2018Science is a crowning glory of the human spirit and its applications remain our best hope for social progress. But there are limitations to current science and perhaps to any science. The general mind-body problem is known to be intractable and currently ... More

Behavior of the SU(2)-Reidemeister torsion form by mutationMar 21 2012Apr 01 2013In this paper, we prove that the Reidemeister torsion twisted by the adjoint representation, which is considered as a 1-form, on the SU(2)-character variety of a knot exterior is invariant under mutation along a Conway sphere.

Sur une généralisation de la notion de système dynamique de rang un définie par une propriété de pistage (On a weak version of the rank one property defined by shadowing)Sep 13 2007We investigate a shadowing property which appears naturally in the study of piecewise monotonic maps of the interval. It turns out to be a weak form of the rank one property, a well-known notion in abstract ergodic theory. We show that this new property ... More

Introduction to discrete functional analysis techniques for the numerical study of diffusion equations with irregular dataMay 11 2015Feb 24 2016We give an introduction to discrete functional analysis techniques for stationary and transient diffusion equations. We show how these techniques are used to establish the convergence of various numerical schemes without assuming non-physical regularity ... More

Action at a distance and causality in quantum theoryOct 28 2013Aug 16 2014The relation between quantum theory and special relativity is peculiar. On the one hand it is close and essential. Steven Weinberg [1], for example, takes the position that the standard model is an inevitable consequence of the marriage of the two theories. ... More

On Wave Particle DualityJul 04 2012Oct 29 2012In a recent paper a mathematical model for quantum measurement was presented. The phenomenon of wave particle duality, which is introduced in every beginning course of quantum theory, can be explained using this model. Although it is a special case of ... More

Organic Superconductors: when correlations and magnetism walk inJan 27 2012Feb 18 2012This survey provides a brief account for the start of organic superconductivity motivated by the quest for high Tc superconductors and its development since the eighties'. Besides superconductivity found in 1D organics in 1980, progresses in this field ... More

Addendum and correction to: Homology cylinders: an enlargement of the mapping class groupJul 30 2002Dec 31 2002In a previous paper [Homology cylinders: an enlargement of the mapping class group, Algebr. Geom. Topol. 1 (2001) 243--270, arXiv:math.GT/0010247], a group H_g of homology cylinders over the oriented surface of genus g is defined. A filtration of H_g ... More

Stabilite de Faber-Krahn en courbure de Ricci positiveApr 08 2005P. Berard and D. Meyer proved a Faber-Krahn inequality for domains in compact manifolds with positive Ricci curvature. We prove stability results for this inequality.

Quintessence: a mini-reviewMar 28 2008Models where the accelerated expansion of our Universe is caused by a quintessence scalar field are reviewed. In the framework of high energy physics, the physical nature of this field is discussed and its interaction with ordinary matter is studied and ... More

Inflationary Perturbations: the Cosmological Schwinger EffectApr 24 2007This pedagogical review aims at presenting the fundamental aspects of the theory of inflationary cosmological perturbations of quantum-mechanical origin. The analogy with the well-known Schwinger effect is discussed in detail and a systematic comparison ... More

The Quantum State of Inflationary PerturbationsSep 14 2012This article reviews the properties of the quantum state of inflationary perturbations. After a brief description of the inflationary background, the wavefunction of the Mukhanov-Sasaki variable is calculated and shown to be that of a strongly squeezed ... More

Everything You Always Wanted To Know About The Cosmological Constant Problem (But Were Afraid To Ask)May 15 2012This article aims at discussing the cosmological constant problem at a pedagogical but fully technical level. We review how the vacuum energy can be regularized in flat and curved space-time and how it can be understood in terms of Feynman bubble diagrams. ... More

Inflation and Precision CosmologyDec 18 2003A brief review of inflation is presented. After having demonstrated the generality of the inflationary mechanism, the emphasize is put on its simplest realization, namely the single field slow-roll inflationary scenario. Then, it is shown how, concretely, ... More

Nonlinear integrable systems related to arbitrary space-time dependence of the spectral transformJan 14 1994We propose a general algebraic analytic scheme for the spectral transform of solutions of nonlinear evolution equations. This allows us to give the general integrable evolution corresponding to an arbitrary time and space dependence of the spectral transform ... More

Une nouvelle analyse des mesures maximisant l'entropie des difféomorphismes d'Anosov de surfacesJan 16 2008This note illustrates the strategy of our paper on piecewise affine surface homeomorphisms by giving a new proof of the finite multiplicity of the maximum entropy measure of Anosov diffeomorphisms (here on surfaces). This approach avoids the explicit ... More

A minicourse on entropy theory on the intervalNov 11 2006We give a survey of the entropy theory of interval maps as it can be analyzed using ergodic theory, especially measures of maximum entropy and periodic points. The main tools are (i) a version of Hofbauer's Markov diagram, (ii) the shadowing property ... More

Concordance of boundary linksJun 22 2003We show that the twisted signature invariants of boundary link concordance derived from unitary representations of the free group are actually ordinary link concordance invariants. We also show how the discontinuity locus of this signature function is ... More

Bowen factors, their degree, and codings of surface diffeomorphismsJul 11 2018We show that symbolic finite-to-one extensions of the type constructed by O. Sarig for surface diffeomorphisms induce H\"older-continuous conjugacies on large sets, sometimes preserving transitivity. We deduce this from their Bowen property. This notion, ... More

Decomposition of the Turaev-Viro TQFTMar 26 2009We show that for every spherical category $\C$ with invertible dimension, the Turaev-Viro TQFT admits a splitting into blocks which come from an HQFT, called the Turaev-Viro HQFT. The Turaev-Viro HQFT has the classifying space $B\grad$ as target space, ... More

A marvelous contribution from Michel Henon to globular cluster's study : the isochrone clusterNov 17 2014A survey of Michel Henon contributions to the study of globular cluster systems.

Vlavov and Poisson equations in the context of self-gravitating systemsFeb 20 2004We present Vlasov's equation and its association with Poisson's equation in the context of modelling self-gravitating systems such as Globular Clusters or Galaxies. We first review the classical hypotheses of the model. We continue with a presentation ... More

Equilibrium of stellar dynamical systems in the context of the Vlasov-Poisson modelJun 14 2007This short review is devoted to the problem of the equilibrium of stellar dynamical systems in the context of the Vlasov-Poisson model. In a first part we will review some classical problems posed by the application of the Vlasov-Poisson model to the ... More

Puzzles of Quasi-Finite Type, Zeta Functions and Symbolic Dynamics for Multi-Dimensional MapsOct 30 2006Sep 14 2009We introduce "puzzles of quasi-finite type" which are the counterparts of our subshifts of quasi-finite type (Invent. Math. 159 (2005)) in the setting of combinatorial puzzles as defined in complex dynamics. We are able to analyze these dynamics defined ... More

On the Matrix-Element Expansion of a Circulant DeterminantFeb 20 2015Apr 21 2015The determinant of an $N \times N$ circulant matrix $M = {\rm CIRC}[x_0, x_1, ..., x_{N-1}$] can be expanded in the form det$ ~M= \sum C_{a_0 a_1 ...a_{N-1}} x_{a_0} x_{a_1}...x_{a_{N-1}}$. By using the generating function of a restricted, mod-$N$ partition ... More

Strong coupling in the far-infrared between graphene plasmons and the surface optical phonons of silicon dioxideMay 29 2014We study plasmonic resonances in electrostatically gated graphene nanoribbons on silicon dioxide substrates. Absorption spectra are measured in the mid-far infrared and reveal multiple peaks, with width-dependent resonant frequencies. We calculate the ... More

Dimensional entropies and semi-uniform hyperbolicityFeb 03 2011We describe dimensional entropies introduced in a previous work list some of their properties and give some new proofs. These entropies allowed the definition of entropy-expanding maps. We introduce a new notion of entropy-hyperbolicity for diffeomorphisms. ... More

Nonlocal refuge model with a partial controlMay 30 2013In this paper, we analyse the structure of the set of positive solutions of an heterogeneous nonlocal equation of the form: $$ \int_{\Omega} K(x, y)u(y)\,dy -\int_ {\Omega}K(y, x)u(x)\, dy + a_0u+\lambda a_1(x)u -\beta(x)u^p=0 \quad \text{in}\quad \times ... More

Singular measure as principal eigenfunction of some nonlocal operatorsFeb 05 2013Feb 06 2013In this paper, we are interested in the spectral properties of the generalised principal eigenvalue of some nonlocal operator. That is, we look for the existence of some particular solution $(\lambda,\phi)$ of a nonlocal operator. $$\int_{\O}K(x,y)\phi(y)\, ... More

Convergence to equilibrium for positive solutions of some mutation-selection modelAug 29 2013In this paper we are interested in the long time behaviour of the positive solutions of the mutation selection model with Neumann Boundary condition: $$ \frac{\partial u(x,t)}{dt}=u\left[r(x)-\int_{\O}K(x,y)|u|^{p}(y)\,dy\right]+\nabla\cdot\left(A(x)\nabla ... More

The rotational evolution of young low mass starsDec 18 2007Star-disk interaction is thought to drive the angular momentum evolution of young stars. In this review, I present the latest results obtained on the rotational properties of low mass and very low mass pre-main sequence stars. I discuss the evidence for ... More

Inflation after Planck: and the winners areDec 13 2013We review the constraints that the recently released Cosmic Microwave Background (CMB) Planck data put on inflation and we argue that single field slow-roll inflationary scenarios (with minimal kinetic term) are favored. Then, within this class of models, ... More

Hamiltonian quantization of General Relativity with the change of signatureFeb 15 1994We show in this article how the usual hamiltonian formalism of General Relativity should be modified in order to allow the inclusion of the Euclidean classical solutions of Einstein's equations. We study the effect that the dynamical change of signature ... More

Regularity Problem for Extremal VectorsMar 08 2007In this paper, we will use results developed by Ansari and Enflo in the theory of bounded linear operators with dense range. We define two maps, with regards to some parameters, that control surjectivity default of a given operator, and prove analycity ... More

A continuous, piecewise affine surface map with no measure of maximal entropyFeb 16 2009It is known that piecewise affine surface homeomorphisms always have measures of maximal entropy. This is easily seen to fail in the discontinuous case. Here we describe a piecewise affine, globally continuous surface map with no measure of maximal entropy. ... More

The large-parts formula for p(n)Feb 07 2010A new formula for the partition function $p(n)$ is developed. We show that the number of partitions of $n$ can be expressed as the sum of a simple function of the two largest parts of all partitions. Specifically, if $a_1 + >... + a_k = n$ is a partition ... More

Factorization of and Determinant Expressions for the Hypersums of Powers of IntegersApr 21 2011Apr 26 2011We derive a compact determinant formula for calculating and factorizing the hypersum polynomials S^{(L)}_k(N) \equiv \sum_{n_1=1}^N ...\sum_{n_{L+1}=1}^{n_{L}}(n_{L+1})^k expressed in the variable N(N+L+1)

Longest common substring for random subshifts of finite typeMay 20 2019In this paper we study the behaviour of the longest common substring for random subshifts of finite type (for dynamicists) or the longest common substring for random sequences in random environments (for probabilists). We prove that for invariant measures ... More

The almost Borel structure of diffeomorphisms with some hyperbolicityMar 11 2014These lecture notes focus on a recent result of Mike Hochman: an arbitrary standard Borel system can be embedded into a mixing Markov with equal entropy, respecting all invariant probability measures, with two exceptions: those carried by periodic orbits ... More

Renormalized kinetic theory of classical fluids in and out of equilibriumFeb 01 2011We present a theory for the construction of renormalized kinetic equations to describe the dynamics of classical systems of particles in or out of equilibrium. A closed, self-consistent set of evolution equations is derived for the single-particle phase-space ... More

A Factorization of the Conway PolynomialNov 08 1997A string link S can be closed in a canonical way to produce an ordinary closed link L. We also consider a twisted closing which produces a knot K. We give a formula for the Conway polynomial of L as a product of the Conway polynomial of K times a power ... More

Homology cylinders: an enlargement of the mapping class groupOct 26 2000Apr 24 2001We consider a homological enlargement of the mapping class group, defined by homology cylinders over a closed oriented surface (up to homology cobordism). These are important model objects in the recent Goussarov-Habiro theory of finite-type invariants ... More

Pincement spectral en courbure de Ricci positiveApr 08 2005We show that for n dimensional manifolds whose the Ricci curvature is greater or equal to n-1 and for k in {1,...,n+1}, the k-th eigenvalue for the Laplacian is close to n if and only if the manifold contains a subset which is Gromov-Hausdorff close to ... More

Lithium depletion and the rotational history of exoplanet host starsAug 28 2008Sep 03 2008Israelian et al. (2004) reported that exoplanet host stars are lithium depleted compared to solar-type stars without detected massive planets, a result recently confirmed by Gonzalez (2008). We investigate whether enhanced lithium depletion in exoplanet ... More

Labeled binary planar trees and quasi-Lie algebrasApr 13 2005Apr 17 2009We study the natural map eta between a group of binary planar trees whose leaves are labeled by elements of a free abelian group H and a certain group D(H) derived from the free Lie algebra over H. Both of these groups arise in several different topological ... More

Subshifts of quasi-finite typeMay 12 2003May 08 2004We introduce subshifts of quasi-finite type as a generalization of the well-known subshifts of finite type. This generalization is much less rigid and therefore contains the symbolic dynamics of many non-uniform systems, e.g., piecewise monotonic maps ... More

The maximal decomposition of the Turaev-Viro TQFTAug 20 2009Sep 01 2009In a previous work arXiv:0903.4512, we have built an homotopical Turaev-Viro invariant and an HQFT from the universal graduation of a spherical category. In the present paper, we show that every graduation $(G,p)$ of a spherical category $\C$ defines ... More

The invariant of Turaev-Viro from Group categoryAug 24 2006Aug 29 2006A Group category is a spherical category whose simple objects are invertible. The invariant of Turaev-Viro with this particular category is in fact the invariant of Dijkgraaf-Witten whose the group and the 3-cocycle is given by the simple objects and ... More

A volume form on the SU(2)-representation space of knot groupsSep 27 2004Mar 06 2009For a knot K in S^3 we construct according to Casson--or more precisely taking into account Lin and Heusener's further works--a volume form on the SU(2)-representation space of the group of K. We prove that this volume form is a topological knot invariant ... More

Mysteries of Visual ExperienceApr 28 2016Sep 28 2016Science is a crowning glory of the human spirit and its applications remain our best hope for social progress. But there are limitations to current science and perhaps to any science. The general mind-body problem is known to be intractable and currently ... More

Velocity-induced collapses of stable neutron starsJul 12 2001The collapse of spherical neutron stars is studied in General Relativity. The initial state is a stable neutron star to which an inward radial kinetic energy has been added through some velocity profile. For two different equations of state and two different ... More

Harnack type inequality for positive solution of some integral equationFeb 07 2013In this paper, we establish some Harnack type inequalities satisfied by positive solutions of nonlocal inhomogeneous equations arising in the description of various phenomena ranging from population dynamics to micro-magnetism. For regular domains, we ... More

On a simple criterion for the existence of a principal eigenfunction of some nonlocal operatorsJun 25 2011In this paper we are interested in the existence of a principal eigenfunction of a nonlocal operator which appears in the description of various phenomena ranging from population dynamics to micro-magnetism. More precisely, we study the following eigenvalue ... More

Generalizing Ramanujan's J FunctionsSep 27 2011Oct 03 2011We generalize Ramanujan's expansions of the fractional-power Euler functions (q^{1/5})_{\infty} = [ J_1 - q^{1/5} + q^{2/5} J_2 ](q^5)_{\infty} and (q^{1/7})_{\infty} = [ J_1 + q^{1/7} J_2 - q^{2/7} + q^{5/7} J_3 ] (q^7)_{\infty} to (q^{1/N})_{\infty}, ... More

Inflationary Cosmological Perturbations of Quantum-Mechanical OriginJun 01 2004This review article aims at presenting the theory of inflation. We first describe the background spacetime behavior during the slow-roll phase and analyze how inflation ends and the Universe reheats. Then, we present the theory of cosmological perturbations ... More

Syntax-based Default Reasoning as Probabilistic Model-based DiagnosisFeb 27 2013We view the syntax-based approaches to default reasoning as a model-based diagnosis problem, where each source giving a piece of information is considered as a component. It is formalized in the ATMS framework (each source corresponds to an assumption). ... More

Dynamics of Anisotropic UniversesMar 30 2006We present a general study of the dynamical properties of Anisotropic Bianchi Universes in the context of Einstein General Relativity. Integrability results using Kovalevskaya exponents are reported and connected to general knowledge about Bianchi dynamics. ... More

A determinant formula for the partition function p(7k + a)Jun 14 2011Jun 16 2011We derive expressions for the partition function p(n), with n in the form 7k+a, as (k+1)-dimensional determinants.

Electrically controlled terahertz magneto-optical phenomena in continuous and patterned grapheneMar 07 2017The magnetic circular dichroism and the Faraday rotation are the fundamental phenomena of great practical importance arising from the breaking of the time reversal symmetry by a magnetic field. In most materials the strength and the sign of these effects ... More

Highly tunable hybrid metamaterials employing split-ring resonators strongly coupled to graphene surface plasmonsJan 22 2015May 01 2015Metamaterials and plasmonics are powerful tools for unconventional manipulation and harnessing of light. Metamaterials can be engineered to possess intriguing properties lacking in natural materials, such as negative refractive index. Plasmonics offers ... More

High power spatial single-mode quantum cascade lasers at 8.9 $μ$mSep 29 2006High performance of InP-based quantum cascade lasers emitting at $\lambda$ ~ 9$\mu$m are reported. Thick electroplated gold layer was deposited on top of the laser to improve heat dissipation. With one facet high reflection coated, the devices produce ... More

Microcanonical and resource-theoretic derivations of the thermal state of a quantum system with noncommuting chargesDec 03 2015Jul 21 2016The grand canonical ensemble lies at the core of quantum and classical statistical mechanics. A small system thermalizes to this ensemble while exchanging heat and particles with a bath. A quantum system may exchange quantities represented by operators ... More

Evidence of Linear Chirp in Mid-Infrared Quantum Cascade LasersApr 11 2018We measure the inter-modal phase relation of a quantum cascade laser frequency comb operating at 8 um using a coherent beatnote spectroscopy. We find these phases to be reproducible after cycling the power of the device, and to be smoothly varying with ... More

Quantum Coarse-Graining: An Information-Theoretic Approach to ThermodynamicsJul 11 2016We investigate fundamental connections between thermodynamics and quantum information theory. First, we show that the operational framework of thermal operations is nonequivalent to the framework of Gibbs-preserving maps, and we comment on this gap. We ... More

Quantum model of gain in phonon-polariton lasersDec 13 2017Apr 11 2018We develop a quantum model for the calculation of the gain of phonon-polariton intersubband lasers. The polaritonic gain arizes from the interaction between the electrons confined in a quantum well structure and the phonon confined in one layer of the ... More

High-Power Directional Emission from Microlasers with Chaotic ResonatorsJun 15 1998Jul 15 1998High-power and highly directional semiconductor cylinder-lasers based on an optical resonator with deformed cross section are reported. In the favorable directions of the far-field, a power increase of up to three orders of magnitude over the conventional ... More

Magneto-transport controlled by Landau polariton statesMay 02 2018Oct 17 2018Hybrid excitations, called polaritons, emerge in systems with strong light-matter coupling. Usually, they dominate the linear and nonlinear optical properties with applications in quantum optics. Here, we show the crucial role of the electronic component ... More

Computing and Testing Pareto Optimal CommitteesMar 18 2018Selecting a set of alternatives based on the preferences of agents is an important problem in committee selection and beyond. Among the various criteria put forth for the desirability of a committee, Pareto optimality is a minimal and important requirement. ... More

Hopf algebroids and secondary characteristic classesNov 20 2007Dec 04 2007We study a Hopf algebroid, $\calh$, naturally associated to the groupoid $U_n^\delta\ltimes U_n$. We show that classes in the Hopf cyclic cohomology of $\calh$ can be used to define secondary characteristic classes of trivialized flat $U_n$-bundles. For ... More

Are the two peaks of the Cathedral QPO real harmonics?Nov 07 2011We present a study of the two main peaks of the so-called cathedral QPO in XTE J1859+226. While looking at the temporal evolution of the two features we show that they do not manifest the same amplitude of variations of their power, and do not seem to ... More

Object Recognition with Imperfect Perception and Redundant DescriptionFeb 13 2013This paper deals with a scene recognition system in a robotics contex. The general problem is to match images with <I>a priori</I> descriptions. A typical mission would consist in identifying an object in an installation with a vision system situated ... More

The Galactic population of HMXBs as seen with INTEGRAL during its four first years of activityJan 07 2008We collected the parameters (position, absorption, spin, orbital period, etc..), when known, of all Galactic sources detected by INTEGRAL during its four first years of activity. We use these parameters to test theoretical predictions. For example, it ... More

Convergence to the Equilibrium in a Lotka-Volterra Ode Competition System with MutationsJan 26 2013Mar 07 2013In this paper we are investigating the long time behaviour of the solution of a mutation competition model of Lotka-Volterra's type. Our main motivation comes from the analysis of the Lotka-Volterra's competition system with mutation which simulates the ... More

After 50+ Years in Statistics, An ExchangeJul 24 2012This is an exchange between Jerome Sacks and Donald Ylvisaker covering their career paths along with some related history and philosophy of Statistics.

Spin Chern-Simons and Spin TQFTsMay 09 2006In a previous paper we constructed classical spin Chern-Simons for any compact Lie group $G$: a gauge theory whose action depends on the spin structure of the 3-manifold. Here we apply geometric quantization to the classical Hamiltonian theory and investigate ... More

External field effect of modified Newtonian dynamics in the Solar systemOct 07 2010Jan 03 2011The Modified Newtonian Dynamics (MOND) has been formulated as a modification of the Poisson equation for the Newtonian gravitational field. This theory generically predicts a violation of the strong version of the equivalence principle, and as a result ... More

Ejection of the corona at State transitions: a common behaviour in microquasars?Feb 09 2009The onset of most microquasar outbursts is characterized by a state transition between a Low/Hard State (LHS) and a High/Soft State (HSS). Besides drastic spectral and timing changes, this transition often shows a discrete ejection event detectable in ... More