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Results for "O. Doré"

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Competition between shocks and entropy floor : unifying groups and clusters of galaxiesJun 26 2001Semi-analytic models of X-ray clusters and groups of galaxies, relying on the idea that there was a non-gravitational energy injection in these systems, are able to reproduce many observed correlations, in particular the L_X-T relation and the ``central ... More
CMB Power Spectrum Estimation via Hierarchical DecompositionApr 27 2001We have developed a fast, accurate and generally applicable method for inferring the power spectrum and its uncertainties from maps of the cosmic microwave background (CMB) in the presence of inhomogeneous and correlated noise. For maps with 10 to 100 ... More
Probing CMB Non-Gaussianity Using Local CurvatureFeb 06 2002Feb 06 2002It is possible to classify pixels of a smoothed cosmic microwave background (CMB) fluctuation map according to their local curvature in ``hill'', ``lake'' and ``saddle'' regions. In the Gaussian case, fractional areas occupied by pixels of each kind can ... More
Extragalactic Foreground Contamination in Temperature-based CMB Lens ReconstructionOct 28 2013We discuss the effect of unresolved point source contamination on estimates of the CMB lensing potential, from components such as the thermal Sunyaev-Zel'dovich effect, radio point sources, and the Cosmic Infrared Background. We classify the possible ... More
Elliptical Beams in CMB Temperature and Polarization Anisotropy Experiments: An Analytic ApproachJul 18 2001Dec 04 2001We present an analytic approach to the estimation of beam asymmetry effects in CMB temperature and linear polarization anisotropy experiments. We derive via perturbative expansions simple and accurate results for the case of an elliptical Gaussian window. ... More
Optimizing future experiments of cosmic far-infrared background: a principal component approachDec 07 2016Apr 16 2017The anisotropies of cosmic far-infrared background (CFIRB) probe the star formation rate (SFR) of dusty star-forming galaxies as a function of dark matter halo mass and redshift. We explore how future CFIRB experiments can optimally improve the SFR constraints ... More
Sharpening the Precision of the Sunyaev-Zel'dovich Power SpectrumMar 31 2009Using both halo model calculations and a large sample of simulated SZ maps, we demonstrate that high-mass clusters add significant non-Gaussian variance to measurements of the SZ power spectrum amplitude. The difficulty in correctly accounting theoretically ... More
Joint cosmological parameters forecast from CFHTLS-cosmic shear and CMB dataApr 15 2004We present a prospective analysis of a combined cosmic shear and cosmic microwave background data set, focusing on a Canada France Hawaii Telescope Legacy Survey (CFHTLS) type lensing survey and the current WMAP-1 year and CBI data. We investigate the ... More
Cluster physics from joint weak gravitational lensing and Sunyaev-Zel'dovich dataFeb 09 2001We present a self consistent method to perfom a joint analysis of Sunyaev-Zel'dovich and weak gravitational lensing observation of galaxy clusters. The spatial distribution of the cluster main constituents is described by a perturbative approach. Assuming ... More
Skeleton as a probe of the cosmic web: the 2D caseJun 30 2003We discuss the skeleton as a probe of the filamentary structures of a 2D random field. It can be defined for a smooth field as the ensemble of pairs of field lines departing from saddle points, initially aligned with the major axis of local curvature ... More
MAPCUMBA : a fast iterative multi-grid map-making algorithm for CMB experimentsJan 08 2001The data analysis of current Cosmic Microwave Background (CMB) experiments like BOOMERanG or MAXIMA poses severe challenges which already stretch the limits of current (super-) computer capabilities, if brute force methods are used. In this paper we present ... More
Modeling the Radio Background from the First Black Holes at Cosmic Dawn: Implications for the 21 cm Absorption AmplitudeMar 05 2018Sep 27 2018We estimate the 21 cm Radio Background from accretion onto the first intermediate-mass Black Holes between $z\approx 30$ and $z\approx 16$. Combining potentially optimistic, but plausible, scenarios for black hole formation and growth with empirical correlations ... More
Testing Gravity with the CFHTLS-Wide Cosmic Shear Survey and SDSS LRGsDec 10 2007General relativity as one the pillar of modern cosmology has to be thoroughly tested if we want to achieve an accurate cosmology. We present the results from such a test on cosmological scales using cosmic shear and galaxy clustering measurements. We ... More
Probing dark energy perturbations: the dark energy equation of state and speed of sound as measured by WMAPJul 04 2003Jul 17 2003We review the implications of having a non-trivial matter component in the universe and the potential for detecting such a component through the matter power spectrum and ISW effect. We adopt a phenomenological approach and consider the mysterious dark ... More
Spider Optimization: Probing the Systematics of a Large Scale B-Mode ExperimentOct 01 2007Spider is a long-duration, balloon-borne polarimeter designed to measure large scale Cosmic Microwave Background (CMB) polarization with very high sensitivity and control of systematics. The instrument will map over half the sky with degree angular resolution ... More
Towards Intuitive Reasoning in Axiomatic GeometryApr 01 2019Proving lemmas in synthetic geometry is often a time-consuming endeavour since many intermediate lemmas need to be proven before interesting results can be obtained. Improvements in automated theorem provers (ATP) in recent years now mean they can prove ... More
Are Chaplygin gases serious contenders to the dark energy throne?Jan 15 2003Aug 08 2003We study the implications on both background and perturbation evolution of introducing a Chaplygin gas component in the universe's ingredients. We perform likelihood analyses using wide-ranging, SN1a, CMB and large scale structure observations to assess ... More
Probing the Largest Cosmological Scales with the CMB-Velocity CorrelationJan 28 2007Jan 14 2008Cross-correlation between the CMB and large-scale structure is a powerful probe of dark-energy and gravity on the largest physical scales. We introduce a novel estimator, the CMB-velocity correlation, that has most of his power on large scales and that, ... More
The Elfe System - Verifying mathematical proofs of undergraduate studentsJan 31 2018Elfe is an interactive system for teaching basic proof methods in discrete mathematics. The user inputs a mathematical text written in fair English which is converted to a special data-structure of first-order formulas. Certain proof obligations implied ... More
A compact null set containing a differentiability point of every Lipschitz functionApr 29 2008May 14 2011We prove that in a Euclidean space of dimension at least two, there exists a compact set of Lebesgue measure zero such that any real-valued Lipschitz function defined on the space is differentiable at some point in the set. Such a set is constructed explicitly. ... More
A minimal empirical model for the cosmic far-infrared background anisotropiesNov 14 2016Cosmic far-infrared background (CFIRB) probes unresolved dusty star-forming galaxies across cosmic time and is complementary to ultraviolet/optical probes of galaxy evolution. In this work, we interpret the observed CFIRB anisotropies using an empirical ... More
WFIRST: The Essential Cosmology Space Observatory for the Coming DecadeApr 02 2019Two decades after its discovery, cosmic acceleration remains the most profound mystery in cosmology and arguably in all of physics. Either the Universe is dominated by a form of dark energy with exotic physical properties not predicted by standard model ... More
Optimizing future experiments of cosmic far-infrared background: a principal component approachDec 07 2016The anisotropies of cosmic far-infrared background (CFIRB) probe the star-formation rate (SFR) of dusty star-forming galaxies as a function of dark matter halo mass and redshift. We explore how future CFIRB experiments can optimally improve the SFR constraints ... More
CSMA/CA Bottleneck Remediation in Saturation Mode with New Backoff StrategyJan 07 2015Many modern wireless networks integrate carrier sense mul-tiple access/collision avoidance (CSMA/CA) with exponential backoff as medium access control (MAC) technique. In order to decrease the MAC overhead and the collision probability, we propose in ... More
A minimal empirical model for the cosmic far-infrared background anisotropiesNov 14 2016Mar 01 2017Cosmic far-infrared background (CFIRB) probes unresolved dusty star-forming galaxies across cosmic time and is complementary to ultraviolet and optical observations of galaxy evolution. In this work, we interpret the observed CFIRB anisotropies using ... More
In search of an observational quantum signature of the primordial perturbations in slow-roll and ultra slow-roll inflationMay 04 2019In the standard inflationary paradigm, cosmological density perturbations are generated as quantum fluctuations in the early Universe, but then undergo a quantum-to-classical transition. A key role in this transition is played by squeezing of the quantum ... More
Designing an Inflation Galaxy Survey: how to measure $σ(f_{\rm NL}) \sim 1$ using scale-dependent galaxy biasDec 11 2014The most promising method for measuring primordial non-Gaussianity in the post-Planck era is to detect large-scale, scale-dependent galaxy bias. Considering the information in the galaxy power spectrum, we here derive the properties of a galaxy clustering ... More
A step towards testing general relativity using weak gravitational lensing and redshift surveysDec 01 2008Aug 24 2009Using the linear theory of perturbations in General Relativity, we express a set of consistency relations that can be observationally tested with current and future large scale structure surveys. We then outline a stringent model-independent program to ... More
SPIDER: Probing the Early Universe with a Suborbital PolarimeterJun 15 2011May 02 2013We evaluate the ability of SPIDER, a balloon-borne polarimeter, to detect a divergence-free polarization pattern ("B-modes") in the Cosmic Microwave Background (CMB). In the inflationary scenario, the amplitude of this signal is proportional to that of ... More
SPIDER: a balloon-borne CMB polarimeter for large angular scalesJun 10 2011We describe SPIDER, a balloon-borne instrument to map the polarization of the millimeter-wave sky with degree angular resolution. Spider consists of six monochromatic refracting telescopes, each illuminating a focal plane of large-format antenna-coupled ... More
Compensated Isocurvature Perturbations and the Cosmic Microwave BackgroundJul 25 2011Jan 06 2012Measurements of cosmic microwave background (CMB) anisotropies constrain isocurvature fluctuations between photons and non-relativistic particles to be sub-dominant to adiabatic fluctuations. Perturbations in the relative number densities of baryons and ... More
The Synergy between Weak Lensing and Galaxy Redshift SurveysAug 28 2013Aug 29 2013We study the complementarity of weak lensing (WL) and spectroscopic galaxy clustering (GC) surveys, by forecasting dark energy and modified gravity constraints for three upcoming survey combinations: SuMIRe (Subaru Measurement of Images and Redshifts, ... More
Interpreting the cosmic far-infrared background anisotropies using a gas regulator modelJul 08 2016Cosmic far-infrared background (CFIRB) is a powerful probe of the history of star formation rate and the connection between baryons and dark matter. In this work, we explore to which extent the CFIRB anisotropies can be reproduced by a simple physical ... More
Large-scale CIB maps from PlanckMay 01 2019The cosmic infrared background (CIB) is a powerful probe of large-scale structure across a very large redshift range, consisting of unresolved redshifted infrared emission from dusty galaxies. It can be used to study the astrophysics of galaxies, the ... More
Three-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Foreground PolarizationApr 30 2007We present a full-sky model of polarized Galactic microwave emission based on three years of observations by the Wilkinson Microwave Anisotropy Probe (WMAP) at frequencies from 23 to 94 GHz. The model compares maps of the Stokes Q and U components from ... More
Comparison of map-making algorithms for CMB experimentsJan 24 2005Sep 20 2005We have compared the cosmic microwave background (CMB) temperature anisotropy maps made from one-year time ordered data (TOD) streams that simulated observations of the originally planned 100 GHz Planck Low Frequency Instrument (LFI). The maps were made ... More
The Thermal Design, Characterization, and Performance of the SPIDER Long-Duration Balloon CryostatJun 23 2015Sep 11 2015We describe the SPIDER flight cryostat, which is designed to cool six millimeter-wavelength telescopes during an Antarctic long-duration balloon flight. The cryostat, one of the largest to have flown on a stratospheric payload, uses liquid helium-4 to ... More
Pointing control for the SPIDER balloon-borne telescopeJul 07 2014We present the technology and control methods developed for the pointing system of the SPIDER experiment. SPIDER is a balloon-borne polarimeter designed to detect the imprint of primordial gravitational waves in the polarization of the Cosmic Microwave ... More
Is There Scale-Dependent Bias in Single-Field Inflation?Apr 22 2015Scale-dependent halo bias due to local primordial non-Gaussianity provides a strong test of single-field inflation. While it is universally understood that single-field inflation predicts negligible scale-dependent bias compared to current observational ... More
Dark Energy from Large-Scale Structure Lensing InformationMay 04 2009Wide area Large-Scale Structure (LSS) surveys are planning to map a substantial fraction of the visible universe to quantify dark energy through Baryon Acoustic Oscillations (BAO). At increasing redshift, for example that probed by proposed 21-cm intensity ... More
Using Cross-Correlations to Calibrate Lensing Source Redshift Distributions: Improving Cosmological Constraints from Upcoming Weak Lensing SurveysJun 03 2013Jul 19 2013Cross-correlations between the galaxy number density in a lensing source sample and that in an overlapping spectroscopic sample can in principle be used to calibrate the lensing source redshift distribution. In this paper, we study in detail to what extent ... More
Dissecting the high-z interstellar medium through intensity mapping cross-correlationsAug 01 2016We explore the detection, with upcoming spectroscopic surveys, of three-dimensional power spectra of emission line fluctuations produced in different phases of the Interstellar Medium (ISM) by ionized carbon, ionized nitrogen and neutral oxygen at redshift ... More
Where stars form and live at high redshift: clues from the infraredJan 02 2012Apr 02 2012The relation between dark matter halos and the loci of star formation at high redshift is a pressing question in contemporary cosmology. Matching the abundance of halos to the abundance of infrared (IR) galaxies, we explicit the link between dark matter ... More
Gravitational Potential Reconstruction from Peculiar Velocity and Weak Lensing MeasurementsJul 18 2002We present an analytic method for rapidly forecasting the accuracy of gravitational potential reconstruction possible from measurement of radial peculiar velocities of every galaxy cluster with M > M_th in solid angle \theta^2 and over redshift range ... More
Quantum singularities in (2+1) dimensional matter coupled black hole spacetimesApr 15 2010Sep 16 2010Quantum singularities considered in the 3D BTZ spacetime by Pitelli and Letelier (Phys. Rev. D77: 124030, 2008) is extended to charged BTZ and 3D Einstein-Maxwell-dilaton gravity spacetimes. The occurence of naked singularities in the Einstein-Maxwell ... More
On Groups with a Supercomplemented SubgroupOct 05 2007Groups, in which every subgroup containing some fixed primary cyclic subgroup has a complement, are investigated.
Do baryons trace dark matter in the early universe?Jul 08 2011Jan 06 2012Baryon-density perturbations of large amplitude may exist if they are compensated by dark-matter perturbations so that the total density remains unchanged. Big-bang nucleosynthesis and galaxy clusters allow the amplitudes of these compensated isocurvature ... More
The CMB Quadrupole in a Polarized LightSep 10 2003May 12 2004The low quadrupole of the cosmic microwave background (CMB), measured by COBE and confirmed by WMAP, has generated much discussion recently. We point out that the well-known correlation between temperature and polarization anisotropies of the CMB further ... More
The Non-Linear Fisher Information content of cosmic shear surveysMay 04 2009We quantify the Fisher information content of the cosmic shear survey two-point function as a function of noise and resolution. The two point information of dark matter saturates at the trans-linear scale. We investigate the impact of non-linear non-Gaussianity ... More
On self-similar solutions of the vortex filament equationMar 05 2019We study self-similar solutions of the binormal curvature flow which governs the evolution of vortex filaments and is equivalent to the Landau-Lifshitz equation. The corresponding dynamics is described by the real solutions of $\sigma$-Painlev\'{e} IV ... More
Electrical conductivity of hot Abelian plasma with scalar charge carriersMay 20 2019We study the electrical conductivity of hot Abelian plasma containing scalar charge carriers in the leading logarithmic order in coupling constant $\alpha$ using the Boltzmann kinetic equation. The leading contribution to the collision integral is due ... More
Supercritical instability of Dirac electrons in the field of two oppositely charged nucleiSep 29 2016The Dirac equation for an electron in a finite dipole potential has been studied within the method of linear combination of atomic orbitals (LCAO). The Coulomb potential of the nuclei that compose a dipole is regularized, by considering the finite nuclear ... More
Very weak lensing in the CFHTLS Wide: Cosmology from cosmic shear in the linear regimeDec 06 2007We present an exploration of weak lensing by large-scale structure in the linear regime, using the third-year (T0003) CFHTLS Wide data release. Our results place tight constraints on the scaling of the amplitude of the matter power spectrum sigma_8 with ... More
Inflation Physics from the Cosmic Microwave Background and Large Scale StructureSep 20 2013May 30 2014Fluctuations in the intensity and polarization of the cosmic microwave background (CMB) and the large-scale distribution of matter in the universe each contain clues about the nature of the earliest moments of time. The next generation of CMB and large-scale ... More
BLASTbus electronics: general-purpose readout and control for balloon-borne experimentsJul 07 2014We present the second generation BLASTbus electronics. The primary purposes of this system are detector readout, attitude control, and cryogenic housekeeping, for balloon-borne telescopes. Readout of neutron transmutation doped germanium (NTD-Ge) bolometers ... More
Primordial Gravitational Wave Detectability with Deep Small-Sky CMB ExperimentsAug 09 2011We use Bayesian estimation on direct T-Q-U CMB polarization maps to forecast errors on the tensor-to- scalar power ratio r, and hence on primordial gravitational waves, as a function of sky coverage fsky. This method filters the quadratic pixel-pixel ... More
Baryons do trace dark matter 380,000 years after the big bang: Search for compensated isocurvature perturbations with WMAP 9-year dataJun 18 2013Primordial isocurvature fluctuations between photons and either neutrinos or non-relativistic species such as baryons or dark matter are known to be sub-dominant to adiabatic fluctuations. Perturbations in the relative densities of baryons and dark matter ... More
The Weight of Emptiness: The Gravitational Lensing Signal of Stacked VoidsOct 09 2012Nov 06 2012The upcoming new generation of spectroscopic galaxy redshift surveys will provide large samples of cosmic voids, the distinct, large underdense structures in the universe. Combining these with future galaxy imaging surveys, we study the prospects of probing ... More
Interpreting the cosmic far-infrared background anisotropies using a gas regulator modelJul 08 2016Jan 24 2018Cosmic far-infrared background (CFIRB) is a powerful probe of the history of star formation rate (SFR) and the connection between baryons and dark matter across cosmic time. In this work, we explore to which extent the CFIRB anisotropies can be reproduced ... More
CP violation in production of neutralinos in e+ e- collisionsNov 13 2003We propose T-odd and CP-odd odd asymmetries in order to analyze the impact of CP violating phases in neutralino production and subsequent leptonic two-body decays. We present numerical results of these asymmetries and of the cross sections for complex ... More
Stochastic Electrochemical KineticsAug 26 2016Sep 18 2016A new tool for modeling electrochemical kinetics is presented. An extension of the Stochastic Simulation Algorithm framework to electrochemical systems is proposed. The physical justifications and constraints for the derivation of a chemical master equation ... More
Lieux de dégénérescence (Degeneracy loci)Dec 11 1998We prove Lefschetz type theorems for cohomology groups and Picard groups of degeneracy loci for vector bundle maps. We also treat the case of antisymmetric maps.
The universality class of the continuous phase transition in the 2D "Touch and Stop" cluster growth percolation modelNov 02 2012We consider the "Touch and Stop" cluster growth percolation (CGP) model on the two dimensional square lattice. A key-parameter in the model is the fraction p of occupied "seed" sites that act as nucleation centers from which a particular cluster growth ... More
Potential-density pairs and vertical tilt of the stellar velocity ellipsoidApr 07 2009We define new potential-density pairs and examine the impact of the potential flattening on the vertical velocity ellipsoid tilt, $\delta$. By means of numerical integrations and analytical calculations, we estimate $\delta$ in a variety of galactic potentials. ... More
Integrable Many-Body Systems of Calogero-Moser-Sutherland Type in High DimensionOct 21 1995Nov 09 1995A new series of integrable cases of the many-body problem in many-dimensional spaces is found. That series appears as a part of the larger series of integrable problems, which are in 1-1 correspondence with Krichever-Novikov algebras of affine type (that ... More
Post-Riemannian Merger of Yang-Mills Interactions with GravityAug 17 2000Sep 05 2001We show that a post-Riemannian spacetime can accommodate an internal symmetry structure of the Yang-Mills prototype in such a way that the internal symmetry becomes an integral part of the spacetime itself. The construction encrusts the internal degrees ... More
Theory of the Robin quantum wall in a linear potential. II. Thermodynamic propertiesMay 10 2016A theoretical analysis of the thermodynamic properties of the Robin wall characterized by the extrapolation length $\Lambda$ in the electric field $\mathscr{E}$ that pushes the particle to the surface is presented both in the canonical and two grand canonical ... More
Mass transfer from the donor of GRS 1915+105Apr 09 2002Apr 18 2002A scenario for a periodic filling and emptying of the accretion disc of the microquasar GRS 1915+105 is proposed, by computing the mass transfer rate from the evolving low mass red giant donor (Greiner at al. 2001) and comparing it with the observed accretion ... More
A Phenomenological Description of the Non-Fermi-Liquid Phase of MnSiApr 30 2004Aug 10 2004In order to understand the non-Fermi-liquid behavior of MnSi under pressure we propose a scenario on the basis of the multispiral state of the magnetic moment. This state can describe the recent critical experiment of the Bragg sphere in the neutron scattering ... More
Magnetotransport Scaling in Anomalous Metallic Phase near the Mott TransitionMar 21 2001The Hall angle in the doped V_2O_3 is discussed on the basis of an extended Ginzburg-Landau theory of spin fluctuations. A spinon-like collective transport process beyond the ordinary quasiparticle transport theory is necessary to understand the experiment. ... More
Combined QCD analysis of e^+ e^- data at sqrt(s) = 14 to 172 GeVAug 26 1997A study of the energy dependence of event shape observables is presented. The strong coupling constant \alpha_s has been determined from the mean values of six event shape observables. Power corrections, employed for the measurement of \alpha_s, have ... More
LHCf: physics results on forward particle production at LHCOct 14 2013The LHCf experiment is dedicated to the measurement of very forward particle production in the high energy hadron-hadron collisions at LHC, with the aim of improving the cosmic-ray air shower developments models. The detector has taken data in p-p collisions ... More
Revival of Single-Particle Transport Theory for the Normal State of High-Tc Superconductors: I. Relaxation-Time ApproximationApr 24 2012Jan 17 2014How the fluctuation-exchange (FLEX) approximation and the Fermi-liquid theory fail to explain the anomalous behavior of the Hall coefficient in the normal state of high-Tc superconductors is clarified.
Systematic effects in the radio source proper motionJun 26 2009Some models of the expanding Universe predict that the astrometric proper motion of distant radio sources embedded in space-time are non-zero as radial distance from observer to the source grows. Systematic effects due to this proper motion can even increase ... More
High Moments of Large Wigner Random Matrices and Asymptotic Properties of the Spectral NormJul 21 2009Nov 21 2011We consider an ensemble of nxn real symmetric random matrices A whose entries are determined by independent identically distributed random variables that have symmetric probability distribution. Assuming that the moment 12+2delta of these random variables ... More
A class of even walks and divergence of high moments of large Wigner random matricesMay 18 2010May 19 2010We study high moments of truncated Wigner nxn random matrices by using their representation as the sums over the set W of weighted even closed walks. We construct the subset W' of W such that the corresponding sum diverges in the limit of large n and ... More
Asymptotic behavior of two-terminal series-parallel networksJul 02 1997This paper discusses the enumeration of two-terminal series-parallel networks, i.e. the number of electrical networks built with n identical elements connected in series or parallel with two-terminal nodes. They frequently occur in applied probability ... More
Statistics of delta peaks in the spectral density of large random treesJan 23 2003We present an analysis of the spectral density of the adjacency matrix of large random trees. We show that there is an infinity of delta peaks at all real numbers which are eigenvalues of finite trees. By exact enumerations and Monte-Carlo simulations, ... More
Une methode Monte-Carlo pour les meandres sur ordinateur paralleleOct 01 1999Pour modeliser le repliement compact d'un polymere, on etudie la statistique des meandres, definis comme configurations d'un circuit automobile traversant n fois une riviere. Grace a une methode Monte-Carlo adaptee a un ordinateur massivement parallele, ... More
Neutrino detection in the ArgoNeuT LAr TPCOct 13 2011ArgoNeuT, a Liquid Argon Time Projection Chamber (LAr-TPC), has collected thousands of neutrino and anti-neutrino events between 0.1 and 10 GeV in the NuMI beamline at Fermilab (FNAL). Among other issues, the experiment will measure the cross section ... More
Tree decomposition and postoptimality analysis in discrete optimizationMar 25 2009Many real discrete optimization problems (DOPs) are $NP$-hard and contain a huge number of variables and/or constraints that make the models intractable for currently available solvers. Large DOPs can be solved due to their special tructure using decomposition ... More
Explicit Wodzicki excision in cyclic homologyNov 17 2013Oct 21 2014Assuming local one-sided units exist, I give an elementary proof of Wodzicki excision for cyclic homology. The proof is also constructive and provides an explicit inverse excision map. As far as I know, the latter is new.
Challenges to the Generalized Chaplygin Gas CosmologyMar 12 2004The generalized Chaplygin gas (GCG) model allows for an unified description of the cosmologically recent accelerated expansion of the Universe and of the evolution of energy density perturbations. This dark energy - dark matter unification is achieved ... More
Magnetic fields in A stars besides Ap starsSep 24 2013I review ongoing efforts to understand the incidence of magnetism in intermediate-mass stars that are different from the magnetic Ap stars. This includes the search for magnetic fields in chemically peculiar stars of the Am and HgMn types as well as in ... More
The Paschen-Back effect in the Li I 6708 A line and the presence of lithium in cool magnetic Ap starsFeb 19 2008A number of cool magnetic Ap stars show a prominent feature at lambda 6708 A. Its identification with Li I remains controversial due to a poor knowledge of the spectra of rare-earth elements that are strongly enhanced in peculiar stars and can potentially ... More
Zeeman split lines in CP stars: a discovery of low-contrast fields in slow rotators?Nov 30 2007We show that high-resolution observations of resolved Zeeman split lines can be used to obtain new constraints on the stellar magnetic field geometry. In particular, the contrast of the field strength distribution over the stellar surface can be deduced ... More
Automated Trading Systems: Developed and Emerging Capital MarketsMay 04 2005Automated trading systems on developed and emerging capital markets are studied in this paper. The standard for developed market is automated trading system with 40-days simple moving average. We tested it for the index SIX Industrial for 1000 and 730 ... More
Anisotropic Vortices in High-Temperature Superconductors and the Onset of Vortex-like Excitations above the Critical TemperatureApr 28 2005Recently we have found that a three-dimensional superconducting state with anisotropic vortices localized at the vortex-lattice points is a stable state in zero external magnetic field for the layered high temperature uperconductivity materials. There ... More
Topology and Behaviour of Agents: Capital MarketsDec 31 2004Jun 15 2005On a capital market the social group is formed from traders. Individual behaviour of agents is influenced by the need to associate with other agents and to obtain the approval of other agents in the group. Making decisions an individual equates own needs ... More
Two-photon exchange corrections in elastic electron-proton scatteringJan 29 2016We apply a subtracted dispersion relation (DR) formalism with the aim to improve predictions for the two-photon exchange (TPE) corrections to elastic electron-proton scattering observables at small momentum transfers. We study the formalism on the elastic ... More
Guiding structures with multiply connected cross-sections: evolution of propagation in external fields at complex Robin parametersJul 05 2011Properties of the two-dimensional ring and three-dimensional infinitely long straight hollow waveguide with unit width and inner radius $\rho_0$ in the superposition of the longitudinal uniform magnetic field $\bf B$ and Aharonov-Bohm flux are analyzed ... More
Comparative analysis of electric field influence on the quantum wells with different boundary conditions. II. Thermodynamic propertiesFeb 10 2015Apr 07 2015Thermodynamic properties of the one-dimensional (1D) quantum well (QW) with miscellaneous permutations of the Dirichlet (D) and Neumann (N) boundary conditions (BCs) at its edges in the perpendicular to the surfaces electric field $\mathscr{E}$ are calculated. ... More
Superparamagnetic nanoparticle ensemblesNov 20 2009Aug 08 2012Magnetic single-domain nanoparticles constitute an important model system in magnetism. In particular ensembles of superparamagnetic nanoparticles can exhibit a rich variety of different behaviors depending on the inter-particle interactions. Starting ... More
Development of Wearable Systems for Ubiquitous Healthcare Service ProvisioningApr 01 2014This paper reports on the development of a wearable system using wireless biomedical sensors for ubiquitous healthcare service provisioning. The prototype system is developed to address current healthcare challenges such as increasing cost of services, ... More
Minimum weight spanning trees of weighted scale free networksSep 20 2012In this lecture we will consider the minimum weight spanning tree (MST) problem, i.e., one of the simplest and most vital combinatorial optimization problems. We will discuss a particular greedy algorithm that allows to compute a MST for undirected weighted ... More
Encryption dynamics and avalanche parameter for "delayed dynamics"-based cryptosystemsJan 30 2012The presented article attempts to characterize the encryption dynamics of delayed dynamics based block ciphers, designed for the encryption of binary data. For such encryption algorithms, the encryption process relies on a coupling dynamics with time ... More
The local stellar velocity distribution of the Galaxy. Galactic structure and potentialOct 06 1998The velocity distribution of neighbouring stars is deduced from the Hipparcos proper motions. We have used a classical Schwarzschild decomposition and also developed a dynamical model for quasi-exponential stellar discs. This model is a 3-D derivation ... More
Magnetobreakdown oscillations of Nernst-Ettingshausen field in layered conductorsSep 15 2016In the presented report, the Nernst-Ettingshausen effect in layered conductors is investigated. Considering a Fermi surface (FS) consisting of a slightly corrugated cylinder and two corrugated planes distributed periodically in the momentum space, the ... More
Thermal X-ray emission of the remnants of ashperical Supernova explosionsMar 26 2001Evolution of adiabatic remnants of an aspherical supernova explosion in uniform medium are considered. Thermal X-ray emission of such remnants are investigated. It is shown that integral thermal X-ray characteristics (X-ray luminosity and spectrum) of ... More
Thermal X-ray composites as an effect of projectionJun 12 2000Mar 21 2001A new possibility to explain the nature of thermal X-ray composites (TXCs), i.e. a class of supernova remnants (SNRs) with a thermal X-ray centrally-filled morphology within a radio shell, as a projection effect of the 2- or 3-dimensional shell-like SNR ... More