Results for "K. G. Klein"

total 174755took 0.26s
Evidence for Electron Landau Damping in Space Plasma TurbulenceFeb 15 2019How turbulent energy is dissipated in weakly collisional space and astrophysical plasmas is a major open question. Here, we present the application of a field-particle correlation technique to directly measure the transfer of energy between the turbulent ... More
Validity of the Taylor Hypothesis for Linear Kinetic Waves in the Weakly Collisional Solar WindMay 21 2014The interpretation of single-point spacecraft measurements of solar wind turbulence is complicated by the fact that the measurements are made in a frame of reference in relative motion with respect to the turbulent plasma. The Taylor hypothesis---that ... More
Kerman-Klein-Donau-Frauendorf model for odd-odd nuclei: formal theoryNov 05 2002The Kerman-Klein-Donau-Frauendorf (KKDF) model is a linearized version of the Kerman-Klein (equations of motion) formulation of the nuclear many-body problem. In practice, it is a generalization of the standard core-particle coupling model that, like ... More
Spatial analysis of solar type III events associated with narrow band spikes at metric wavelengthsMar 29 2001The spatial association of narrow band metric radio spikes with type III bursts is analyzed. The analysis addresses the question of a possible causal relation between the spike emission and the acceleration of the energetic electrons causing the type ... More
Solar Energetic Particle Events in the 23rd Solar Cycle: Interplanetary Magnetic Field Configuration and Statistical Relationship with Flares and CMEsMar 04 2014We study the influence of the large-scale interplanetary magnetic field configuration on the solar energetic particles (SEPs) as detected at different satellites near Earth and on the correlation of their peak intensities with the parent solar activity. ... More
Interchange Slip-Running Reconnection and Sweeping SEP BeamsSep 26 2011We present a new model to explain how particles (solar energetic particles; SEPs), accelerated at a reconnection site that is not magnetically connected to the Earth, could eventually propagate along the well-connected open flux tube. Our model is based ... More
Electron Ageing and Polarization in Tailed Radio GalaxiesDec 03 1997High-frequency observations of the tailed radio galaxies IC 310, NGC 1265, 3C 129, and 3C 465 have been performed with the Effelsberg 100-m telescope. For the radio galaxies IC 310, NGC 1265 and 3C 465, radio data obtained at low frequencies with the ... More
Fourth order time-stepping for Kadomtsev-Petviashvili and Davey-Stewartson equationsAug 16 2011Dec 06 2011Purely dispersive partial differential equations as the Korteweg-de Vries equation, the nonlinear Schr\"odinger equation and higher dimensional generalizations thereof can have solutions which develop a zone of rapid modulated oscillations in the region ... More
Interpreting Magnetic Variance Anisotropy Measurements in the Solar WindMay 03 2012The magnetic variance anisotropy ($\mathcal{A}_m$) of the solar wind has been used widely as a method to identify the nature of solar wind turbulent fluctuations; however, a thorough discussion of the meaning and interpretation of the $\mathcal{A}_m$ ... More
Numerical study of the long wavelength limit of the Toda latticeApr 09 2014We present the first detailed numerical study of the Toda equations in $2+1$ dimensions in the limit of long wavelengths, both for the hyperbolic and elliptic case. We first study the formal dispersionless limit of the Toda equations and solve initial ... More
Spectral approach to D-bar problemsAug 10 2015We present the first numerical approach to D-bar problems having spectral convergence for real analytic rapidly decreasing potentials. The proposed method starts from a formulation of the problem in terms of an integral equation which is solved with Fourier ... More
Numerical Study of the semiclassical limit of the Davey-Stewartson II equationsJan 19 2014Jun 06 2014We present the first detailed numerical study of the semiclassical limit of the Davey-Stewartson II equations both for the focusing and the defocusing variant. We concentrate on rapidly decreasing initial data with a single hump. The formal limit of these ... More
Continuations of the nonlinear Schrödinger equation beyond the singularityMar 10 2011May 08 2011We present four continuations of the critical nonlinear \schro equation (NLS) beyond the singularity: 1) a sub-threshold power continuation, 2) a shrinking-hole continuation for ring-type solutions, 3) a vanishing nonlinear-damping continuation, and 4) ... More
Nonlinear-damping continuation of the nonlinear Schrödinger equation - a numerical studyJul 17 2011We study the nonlinear-damping continuation of singular solutions of the critical and supercritical NLS. Our simulations suggest that for generic initial conditions that lead to collapse in the undamped NLS, the solution of the weakly-damped NLS $$ i\psi_t(t,\X)+\Delta\psi+|\psi|^{p-1}\psi+i\delta|\psi|^{q-1}\psi=0,\qquad0<\delta ... More
Evaluation of expected solar flare neutrino events in the IceCube observatoryDec 01 2015Since the end of the eighties and in response to a reported increase in the total neutrino flux in the Homestake experiment in coincidence with a solar flare, solar neutrino detectors have searched for solar flare signals. Neutrinos from the decay of ... More
Planning the Future of U.S. Particle Physics (Snowmass 2013): Chapter 7: Underground Laboratory CapabilitiesJan 23 2014These reports present the results of the 2013 Community Summer Study of the APS Division of Particles and Fields ("Snowmass 2013") on the future program of particle physics in the U.S. Chapter 7, on Underground Laboratory Capabilities, discusses the prospects ... More
On the detection of neutrinos from solar flares using pion-decay photons to provide a time window templateMay 21 2015Since the end of the eighties and in response to a reported increase in the total neutrino flux in the Homestake experiment in coincidence with solar flares, solar neutrino detectors have searched for solar flare signals. Even though these detectors have ... More
Using Synthetic Spacecraft Data to Interpret Compressible Fluctuations in Solar Wind TurbulenceJun 28 2012Kinetic plasma theory is used to generate synthetic spacecraft data to analyze and interpret the compressible fluctuations in the inertial range of solar wind turbulence. The kinetic counterparts of the three familiar linear MHD wave modes---the fast, ... More
The slow-mode nature of compressible wave power in solar wind turbulenceJun 21 2011We use a large, statistical set of measurements from the Wind spacecraft at 1 AU, and supporting synthetic spacecraft data based on kinetic plasma theory, to show that the compressible component of inertial range solar wind turbulence is primarily in ... More
Kinetic Scale Density Fluctuations in the Solar WindSep 29 2012We motivate the importance of studying kinetic scale turbulence for understanding the macroscopic properties of the heliosphere, such as the heating of the solar wind. We then discuss the technique by which kinetic scale density fluctuations can be measured ... More
Polarization Properties of Extragalactic Radio Sources and Their Contribution to Microwave Polarization FluctuationsSep 24 2002We investigate the statistical properties of the polarized emission of extragalactic radio sources and estimate their contribution to the power spectrum of polarization fluctuations in the microwave region. The basic ingredients of our analysis are the ... More
Evolution of Magnetic and Superconducting Fluctuations with Doping of High-Tc SuperconductorsNov 21 1997Electronic Raman scattering from high- and low-energy excitations was studied as a function of temperature, extent of hole doping, and energy of the incident photons in Bi_2Sr_2CaCu_2O_{8 \pm \delta} superconductors. For underdoped superconductors, short ... More
Statistical Evidence for Contributions of Flares and Coronal Mass Ejections to Major Solar Energetic Particle EventsNov 15 2014Solar energetic particle (SEP) events are related to flares and coronal mass ejections (CMEs). This work is a new investigation of statistical relationships between SEP peak intensities - deka-MeV protons and near-relativistic electrons - and characteristic ... More
NLO Monte Carlo predictions for heavy-quark production at the LHC: pp collisions in ALICEMay 13 2014Next-to-leading order (NLO) QCD predictions for the production of heavy quarks in proton-proton collisions are presented within three different approaches to quark mass, resummation and fragmentation effects. In particular, new NLO and parton shower simulations ... More
Predictions for the First Parker Solar Probe EncounterFeb 08 2019We examine Alfv\'en Wave Solar atmosphere Model (AWSoM) predictions of the first Parker Solar Probe (PSP) encounter. We focus on the 12-day closest approach centered on the 1st perihelion. AWSoM (van der Holst et al., 2014) allows us to interpret the ... More
Evolution of Magnetic and Superconducting Fluctuations with Doping of High-Tc Superconductors (An electronic Raman scattering study)Nov 09 1997For YBa_2Cu_3O_{6+\delta} and Bi_2Sr_2CaCu_2O_8 superconductors, electronic Raman scattering from high- and low-energy excitations has been studied in relation to the hole doping level, temperature, and energy of the incident photons. For underdoped superconductors, ... More
A Majority of Solar Wind Intervals Support Ion-Driven InstabilitiesApr 17 2018Apr 30 2018We perform a statistical assessment of solar wind stability at 1 AU against ion sources of free energy using Nyquist's instability criterion. In contrast to typically employed threshold models which consider a single free-energy source, this method includes ... More
Convergence, Continuity and Recurrence in Dynamic Epistemic LogicSep 01 2017The paper analyzes dynamic epistemic logic from a topological perspective. The main contribution consists of a framework in which dynamic epistemic logic satisfies the requirements for being a topological dynamical system thus interfacing discrete dynamic ... More
Metrics for Formal Structures, with an Application to Kripke Models and their DynamicsApr 04 2017Aug 25 2017This report introduces and investigates a family of metrics on sets of pointed Kripke models. The metrics are generalizations of the Hamming distance applicable to countably infinite binary strings and, by extension, logical theories or semantic structures. ... More
Turing Completeness of Finite, Epistemic ProgramsJun 21 2017In this note, we show the class of finite, epistemic programs to be Turing complete. Epistemic programs is a widely used update mechanism used in epistemic logic, where it such are a special type of action models: One which does not contain postconditions. ... More
Measuring Collisionless Damping in Heliospheric Plasmas using Field-Particle CorrelationsJul 06 2016An innovative field-particle correlation technique is proposed that uses single-point measurements of the electromagnetic fields and particle velocity distribution functions to investigate the net transfer of energy from fields to particles associated ... More
Evolution of The Proton Velocity Distribution due to Stochastic Heating in the Near-Sun Solar WindFeb 16 2016We investigate how the proton distribution function evolves when the protons undergo stochastic heating by strong, low-frequency, Alfv\'en-wave turbulence under the assumption that $\beta$ is small. We apply our analysis to protons undergoing stochastic ... More
Predicted Impacts of Proton Temperature Anisotropy on Solar Wind TurbulenceMar 02 2015Mar 13 2015Particle velocity distributions measured in the weakly collisional solar wind are frequently found to be non-Maxwellian, but how these non-Maxwellian distributions impact the physics of plasma turbulence in the solar wind remains unanswered. Using numerical ... More
A new sample of giant radio galaxies from the WENSS survey II - A multi-frequency radio study of a complete sample: Properties of the radio lobes and their environmentAug 16 2000We have formed a complete sample of 26 low redshift (z < 0.3) giant radio galaxies (GRGs) from the WENSS survey, selected at flux densities above 1 Jy at 325 MHz. We present 10.5-GHz observations with the 100-m Effelsberg telescope of 18 sources in this ... More
The giant radio galaxy 8C0821+695 and its environmentFeb 01 2000We present new VLA and Effelsberg observations of the radio galaxy 8C0821+695. We have obtained detailed images in total intensity and polarization of this 2 Mpc sized giant. The magnetic field has a configuration predominantly parallel to the source ... More
High energy cosmic-ray interactions with particles from the SunMar 25 2011Cosmic-ray protons with energies above $10^{16}$ eV passing near the Sun may interact with photons emitted by the Sun and be excited to a $\Delta^+$ resonance. When the $\Delta^+$ decays, it produces pions which further decay to muons and photons which ... More
Spectral approach to the scattering map for the semi-classical defocusing Davey-Stewartson II equationSep 19 2018The inverse scattering approach for the defocusing Davey-Stewartson II equation is given by a system of D-bar equations. We present a numerical approach to semi-classical D-bar problems for real analytic rapidly decreasing potentials. We treat the D-bar ... More
Bias in generation of random graphsJul 28 2011We study the statistical properties of the generation of random graphs according the configuration model, where one assigns randomly degrees to nodes. This model is often used, e.g., for the scale-free degree distribution ~d^gamma. For the efficient variant, ... More
Prototype Detector for Ultrahigh Energy Neutrino DetectionJun 10 1998Necessary technical experience is being gained from successful construction and deployment of current prototype detectors to search for UHE neutrinos in Antarctica, Lake Baikal in Russia, and the Mediterranean. The prototype detectors have also the important ... More
Effect of Dilution on Spinodals and PseudospinodalsJan 29 2013We investigate the effect of quenched dilution on the critical and spinodal points in the infinite range (mean-field) and long-range (near-mean-field) Ising model. We find that unlike the short-range Ising model, the effect of the dilution is not simply ... More
Numerical Study of Blowup in the Davey-Stewartson SystemDec 17 2011Nonlinear dispersive partial differential equations such as the nonlinear Schr\"odinger equations can have solutions that blow-up. We numerically study the long time behavior and potential blowup of solutions to the focusing Davey-Stewartson II equation ... More
A new contribution to the conventional atmospheric neutrino fluxSep 17 2014Dec 15 2014Atmospheric neutrinos are an important background to astrophysical neutrino searches, and are also of considerable interest in their own right. This paper points out that the contribution to conventional atmospheric $\nu_e$ of the rare semileptonic decay ... More
Polarization Observables for Kaon Photoproduction from Polarized ProtonsDec 20 2013The search for undiscovered excited states of the nucleon continues to be a focus of experiments at Jefferson Lab.Recent LQCD calculations have confirmed long-standing quark-model predictions of many more states than have so far been identified.A large ... More
Numerical study of the Kerr solution in rotating coordinatesFeb 20 2016The Kerr solution in coordinates corotating with the horizon is studied as a testbed for a spacetime with a helical Killing vector in the Ernst picture. The solution is numerically constructed by solving the Ernst equation with a spectral method and a ... More
Multiple disjunction for spaces of smooth embeddingsJul 25 2014Mar 24 2015We obtain multirelative connectivity statements about spaces of smooth embeddings, deducing these from analogous results about spaces of Poincare embeddings that were established in our previous paper.
Phonon and Elastic Instabilities in MoC and MoNJun 17 1999We present several results related to the instability of MoC and MoN in the B1 (sodium chloride) structure. These compounds were proposed as potential superconductors with moderately high transition temperatures. We show that the elastic instability in ... More
Laboratory and numerical study of intense envelope solitons of water waves: generation, reflection from a wall and collisionsDec 19 2016The investigation of dynamics of intense solitary wave groups of collinear surface waves is performed by means of numerical simulations of the Euler equations and laboratory experiments. The processes of solitary wave generation, reflection from a wall ... More
Multiple disjunction for spaces of Poincare embeddingsJan 25 2008We obtain multirelative connectivity statements about spaces of Poincare embeddings, as precursors to analogous statements about spaces of smooth embeddings. The latter are the key to convergence results in the functor calculus approach to spaces of embeddings. ... More
Probing the anharmonicity of the potential well for magnetic vortex core in nanodotJul 20 2013Nov 05 2013The anharmonicity of the potential well confining the position of the magnetic vortex core is measured dynamically with a Magnetic Resonance Force Microscope (MRFM). The stray field of the MRFM tip is used to displace the core position away from the well ... More
Optimizing magneto-dipolar interactions for synchronizing vortex based spin-torque nano-oscillatorsJun 05 2015We report on a theoretical study about the magneto-dipolar coupling and synchronization between two vortex-based spin-torque nano-oscillators. In this work we study the dependence of the coupling efficiency on the relative magnetization parameters of ... More
Long term variability of Cygnus X-1, III. Radio-X-ray correlationsJul 03 2004Long time scale radio-X-ray correlations in black holes during the hard state have been found in many sources and there seems to emerge a universal underlying relationship which quantitatively describes this behavior. Although it would appear only natural ... More
Short-Term Radio-X-ray Correlations of Cygnus X-1Dec 29 2003We analyze simultaneous radio-X-ray data of Cygnus X-1 from the Ryle telescope (RT) and RXTE over more than 4 a. We show that apparent correlations on short time scales in the lightcurves of Cyg X-1 are probably the coincidental outcome of white noise ... More
Dark Matter in Gas-Rich Dwarf GalaxiesNov 26 2008We investigate the distribution of dark matter (DM) in gas-rich, low-mass galaxies, confronting them with numerical cosmological simulations with cold dark matter (LCDM). We show that the derived rotation curves comply best with cored DM density profiles, ... More
Spin torque resonant vortex core expulsion for an efficient radio-frequency detection schemeMay 20 2015Spin-polarised radio-frequency currents, whose frequency is equal to that of the gyrotropic mode, will cause an excitation of the core of a magnetic vortex confined in a magnetic tunnel junction. When the excitation radius of the vortex core is greater ... More
High precision wavelength estimation method for integrated opticsApr 22 2013Jun 10 2013A novel and simple approach to optical wavelength measurement is presented in this paper. The working principle is demonstrated using a tunable waveguide micro ring resonator and single photodiode. The initial calibration is done with a set of known wavelengths ... More
Type II superconductivity in SrPd2Ge2Feb 05 2013Previous investigations have shown that SrPd2Ge2, a compound isostructural with "122" iron pnictides but iron- and pnictogen-free, is a conventional superconductor with a single s-wave energy gap and a strongly three-dimensional electronic structure. ... More
Penalized Likelihood Regression in Reproducing Kernel Hilbert Spaces with Randomized Covariate DataAug 02 2010Classical penalized likelihood regression problems deal with the case that the independent variables data are known exactly. In practice, however, it is common to observe data with incomplete covariate information. We are concerned with a fundamentally ... More
NGC 3741: dark halo profile from the most extended rotation curveNov 13 2006We present new HI observations of the nearby dwarf galaxy NGC 3741. This galaxy has an extremely extended HI disk, which allows us to trace the rotation curve out to unprecedented distances in terms of the optical disk: we reach 42 B-band exponential ... More
The Quasilinear Premise for the Modeling of Plasma TurbulenceApr 10 2014The quasilinear premise is a hypothesis for the modeling of plasma turbulence in which the turbulent fluctuations are represented by a superposition of randomly-phased linear wave modes, and energy is transferred among these wave modes via nonlinear interactions. ... More
Hot Topics in Ultra-Peripheral CollisionsJan 21 2002Ultra-peripheral collisions of relativistic heavy ions involve long-ranged electromagnetic interactions at impact parameters too large for hadronic interactions to occur. The nuclear charges are large; with the coherent enhancement, the cross sections ... More
Superconducting Transition and Phase Diagram of Single Crystal MgB2Mar 15 2002Mar 27 2002The superconducting phase diagram of MgB2 was determined from magnetization, magneto-transport and the first single-crystal specific heat measurements. A zero-temperature in-plane coherence length of 8 nm is determined. The superconducting anisotropy ... More
Two-band Effects in the Angular Dependence of Hc2 of MgB2 Single CrystalsAug 15 2003The angular dependence of the upper critical field Hc2 of MgB2 single crystals is studied at various temperatures by means of specific heat and transport measurements in magnetic fields up to 17 T. Clear deviations from Ginzburg-Landau behavior are observed ... More
Gutenberg-Richter Scaling - A New ParadigmDec 06 2010We introduce a new model for an earthquake fault system that is composed of non-interacting simple lattice models with different levels of damage denoted by $q$. The undamaged lattice models ($q=0$) have Gutenberg-Richter scaling with a cumulative exponent ... More
Preferential site occupancy of alloying elements in TiAl-based phasesDec 23 2015May 09 2016First principles calculations are used to study the preferential occupation of ternary alloying additions into the binary Ti-Al phases, namely $\gamma$-TiAl, $\alpha_2$-Ti$_3$Al, $\beta_{\mathrm{o}}$-TiAl, and B19-TiAl. While the early transition metals ... More
Simultaneous multifrequency radio observations of the Galactic Centre magnetar SGR J1745-2900Apr 27 2015Jun 30 2015We report on simultaneous observations of the magnetar SGR J1745-2900 at frequencies $\nu = 2.54$ to $225\,\rm{GHz}$ using the Nancay 94-m equivalent, Effelsberg 100-m, and IRAM 30-m radio telescopes. We detect SGR J1745-2900 up to 225 GHz, the highest ... More
On linear degeneracy of integrable quasilinear systems in higher dimensionsSep 30 2009Mar 09 2010We investigate $(d+1)$-dimensional quasilinear systems which are integrable by the method of hydrodynamic reductions. In the case $d\geq 3$ we formulate a conjecture that any such system with an irreducible dispersion relation must be linearly degenerate. ... More
Cherenkov Radiation from $e^+e^-$ Pairs and Its Effect on $ν_e$ Induced ShowersJun 08 2005Nov 03 2005We calculate the Cherenkov radiation from an $e^+e^-$ pair at small separations, as occurs shortly after a pair conversion. The radiation is reduced (compared to that from two independent particles) when the pair separation is smaller than the wavelength ... More
CP Violation in Multibody $B$ Decays from QCD FactorizationAug 07 2017Oct 20 2017We test a data-driven approach based on QCD factorization for charmless three-body $B$-decays by confronting it to measurements of CP violation in $B^- \to \pi^- \pi^+ \pi^-$. While some of the needed non-perturbative objects can be directly extracted ... More
A Millimeter Continuum Survey for Massive Protoclusters in the Outer GalaxyAug 08 2005Our search for the earliest stages of massive star formation turned up twelve massive pre-protocluster candidates plus a few protoclusters. For this search, we selected 47 FIR-bright IRAS sources in the outer Galaxy. We mapped regions of several square ... More
UYSO 1 - An Extremely Young Massive Stellar ObjectFeb 01 2004In the course of a comprehensive mm/submm survey of massive star-forming regions, a particularly interesting object has been found in the surroundings of the bright FIR source IRAS 07029-1215, in a distance of 1 kpc. The object -- named UYSO 1 (Unidentified ... More
Chiral Expansion from Renormalization Group Flow EquationsAug 04 2006We explore the influence of the current quark mass on observables in the low energy regime of hadronic interactions within a renormalization group analysis of the Nambu-Jona-Lasinio model in its bosonized form. We derive current quark mass expansions ... More
Multi-Frequency Study of the B3-VLA Sample II. The DatabaseSep 01 1999We present total flux densities of 1049 radio sources in the frequency range from 151 MHz to 10.6 GHz. These sources belong to the B3-VLA sample, which is complete down to 100 mJy at 408 MHz. The data constitute a homogeneous spectral database for a large ... More
Large-Scale Radio Structure in the Universe: Giant Radio GalaxiesApr 03 2004Giant radio galaxies (GRGs), with linear sizes larger than 1 Mpc (H0=50 km/s/Mpc), represent the biggest single objects in the Universe. GRGs are rare among the entire population of radio galaxies (RGs) and their physical evolution is not well understood ... More
Muon Acceleration in Cosmic-ray SourcesAug 09 2012Many models of ultra-high energy cosmic-ray production involve acceleration in linear accelerators located in Gamma-Ray Bursts magnetars, or other sources. These source models require very high accelerating gradients, $10^{13}$ keV/cm, with the minimum ... More
The spectral-curvature parameter: an alternative tool for the analysis of synchrotron spectraApr 09 2003The so-called Spectral Curvature Parameter(SCP), when plotted versus the high-frequency spectral index ($alpha_{high}$) of synchrotron sources, provides crucial parameters on the continuum spectrum of synchrotron radiation without the more complex modeling ... More
Unveiling Dark Matter with HI and Halpha Data - Observational ProblemsJun 27 2002Jul 01 2002We present combined Halpha+HI rotation curves for a sample of spiral galaxies. Most of the velocity profiles (spectra at single points) in these galaxies are asymmetric, preventing the use of standard methods like the first moment analysis and the single ... More
Spinodal decomposition in polymer mixtures via surface diffusionJan 17 2006We present experimental results for spinodal decomposition in polymer mixtures of gelatin and dextran. The domain growth law is found to be consistent with t^1/4-growth over extended time-regimes. Similar results are obtained from lattice simulations ... More
$B^0-\bar{B}^0$ Mixing at Next-to-Leading OrderJun 20 2016Sep 20 2016We compute the perturbative corrections to the HQET sum rules for the matrix element of the \Delta B=2 operator that determines the mass shift of $B^0$, $\bar{B}^0$ states. Technically, we obtain analytically the non-factorizable contributions at order ... More
Regularization Methods for Nuclear Lattice Effective Field TheoryMay 26 2015Jun 17 2015We investigate Nuclear Lattice Effective Field Theory for the two-body system for several lattice spacings at lowest order in the pionless as well as in the pionful theory. We discuss issues of regularizations and predictions for the effective range expansion. ... More
The dwarf galaxy DDO 47 as a dark matter laboratory: testing cusps hiding in triaxial halosJun 22 2005Oct 20 2005We present an analysis of high resolution HI data of the dwarf galaxy DDO 47, aimed at testing the hypothesis that dark halo triaxiality might induce non-circular motions resulting in rotation curves best fitted by cored halos, even if the dark matter ... More
The line-of-sight warp of the spiral galaxy ESO 123-G23May 20 2003We present 3-D modelling of the distribution and kinematics of the neutral hydrogen in the spiral galaxy ESO 123-G23. The optical appearance of this galaxy is an almost perfectly edge-on disk, while the neutral hydrogen is found to extend vertically out ... More
Cold dust in the starburst galaxy M82Apr 13 2000The starburst galaxy M82 has been mapped at 1.2 mm using the IRAM 30-m telescope and the MPIfR 19-channel bolometer. The influence of the sidelobe pattern and the 12CO(2-1) line has been carefully analyzed. Based on this analysis, we conclude that the ... More
Antiferromagnetic Excitations and Van Hove Singularities in YBa$_2$Cu$_3$O$_{6+x}$Oct 18 1995We show that in quasi-two-dimensional $d$-wave superconductors Van Hove singularities close to the Fermi surface lead to novel magnetic quasi-particle excitations. We calculate the temperature and doping dependence of dynamical magnetic susceptibility ... More
Comparison of giant radio pulses in young pulsars and millisecond pulsarsJan 04 2007Pulse-to-pulse intensity variations are a common property of pulsar radio emission. For some of the objects single pulses are often 10-times stronger than their average pulse. The most dramatic events are so-called giant radio pulses (GRPs). They can ... More
Effective magnetic fields in degenerate atomic gases induced by light beams with orbital angular momentaDec 01 2004Nov 25 2005We investigate the influence of two resonant laser beams on the mechanical properties of degenerate atomic gases. The control and probe beams of light are considered to have Orbital Angular Momenta (OAM) and act on the three-level atoms in the Electromagnetically ... More
Magnetic Reconnection May Control the Ion-Scale Spectral Break of Solar Wind TurbulenceFeb 28 2018The power spectral density of magnetic fluctuations in the solar wind exhibits several power-law-like frequency ranges with a well defined break between approximately 0.1 and 1 Hz in the spacecraft frame. The exact dependence of this break scale on solar ... More
Effective affinities in microarray dataMay 04 2006In the past couple of years several studies have shown that hybridization in Affymetrix DNA microarrays can be rather well understood on the basis of simple models of physical chemistry. In the majority of the cases a Langmuir isotherm was used to fit ... More
Magnetization reduction induced by nonlinear effectsMay 13 2004Nov 11 2004This letter reports the first detailed measurement of $M_z$, the component parallel to the effective field direction, when ferromagnets are excited by microwave fields at high power levels. It is found that $M_z$ drops dramatically at the saturation of ... More
Electronic Raman-scattering study of low-energy excitations in single and double CuO_2-layer Tl-Ba-(Ca)-Cu-O superconductorsNov 11 1997Low energy Raman continuum and the redistribution of the continuum to a peak (2\Delta-peak) in the superconducting state have been studied in Tl-Ba-(Ca)-Cu-O superconductors with single (Tl-2201) and double (Tl-2212) CuO_2 layer. The 2\Delta/k_BT_c ratios ... More
Reply to "Comment on 'Quantum Phase Shift Caused by Spatial Confinement'" by Murray PeshkinFeb 04 2000We describe a force-free phase shift due only to temporal geometric boundary conditions placed on a neutron deBroglie wave packet.
The multi-scale nature of the solar windFeb 09 2019The solar wind is a magnetized plasma and as such exhibits collective plasma behavior associated with its characteristic spatial and temporal scales. The characteristic length scales include the size of the heliosphere, the collisional mean free paths ... More
Comment on: ``Solving the riddle of the bright mismatches: Labeling and effective binding in oligonucleotide arrays"Jul 18 2006In a recent paper [Phys. Rev. E 68, 011906 (2003)], Naef and Magnasco suggested that the "bright" mismatches observed in Affymetrix microarray experiments are caused by the fluorescent molecules used to label RNA target sequences, which would impede target-probe ... More
The dwarf galaxy DDO 47: testing cusps hiding in triaxial halosOct 20 2005We present HI data of the dwarf galaxy DDO 47, aimed at testing the hypothesis that dark halo triaxiality might induce non-circular motions resulting in rotation curves best fitted by cored halos, even if the dark matter halo is intrinsically cuspy. We ... More
Fermi- to non-Fermi-liquid crossover and Kondo transition in two-dimensional Cu$_{2/3}$V$_{1/3}$V$_2$S$_4$Nov 13 2018By means of a specific heat ($C$) and electrical resistivity ($\varrho$) study, we give evidence of a pronounced Fermi liquid (FL) behavior with sizable mass renormalization, $m^{\ast}/m = 30$, up to unusually high temperatures $\sim$70 K in the layered ... More
The cored distribution of dark matter in spiral galaxiesMar 05 2004We present the HI data for 5 spiral galaxies that, along with their Halpha rotation curves, are used to derive the distribution of dark matter within these objects. A new method for extracting rotation curves from HI data cubes is presented; this takes ... More
Charge and Spin Dynamics of an Ordered Stripe Phase in La_(1 2/3)Sr_(1/3)NiO_4 by Raman SpectroscopyNov 14 1997For La_(1 2/3)Sr_(1/3)NiO_4 -- a commensurately doped Mott-Hubbard system -- charge- and spin-ordering in a stripe phase has been investigated by phononic and magnetic Raman scattering. Formation of a superlattice and an opening of a pseudo-gap in the ... More
Polarization characteristics of the Crab pulsar's giant radio pulses at HFCs phasesNov 20 2005Nov 21 2005We discuss our recent discovery of the giant radio emission from the Crab pulsar at its high frequency components (HFCs) phases and show the polarization characteristic of these pulses. This leads us to a suggestion that there is no difference in the ... More
Self-consistent theory of large amplitude collective motion: Applications to approximate quantization of non-separable systems and to nuclear physicsNov 30 1999The goal of the present account is to review our efforts to obtain and apply a ``collective'' Hamiltonian for a few, approximately decoupled, adiabatic degrees of freedom, starting from a Hamiltonian system with more or many more degrees of freedom. The ... More
Berry phase from a quantum Zeno effectMar 31 1999We exhibit a specific implementation of the creation of geometrical phase through the state-space evolution generated by the dynamic quantum Zeno effect. That is, a system is guided through a closed loop in Hilbert space by means a sequence of closely ... More
Non-Hierarchical Clock Synchronization for Wireless Sensor NetworksDec 06 2012Time synchronization is important for a variety of applications in wireless sensor networks including scheduling communication resources, coordinating sensor wake/sleep cycles, and aligning signals for distributed transmission/reception. This paper describes ... More