Results for "A. T. Barnes"

total 249888took 0.14s
Psi to N Nbar mDec 31 2010In this invited talk I discuss two recent applications of charmonium (Psi) decays to N Nbar m final states, where N is a nucleon and m is a light meson. There are several motivations for studying these decays: 1) They are useful for the study of N* spectroscopy; ... More
Strong Decays: Past, Present and FutureNov 07 2003In this talk I review the history of models of strong decays, from the original model through applications to charmonium, light and charmed mesons, glueballs and hybrids. Our current rather limited understanding of the QCD mechanism of strong decays is ... More
Exotic Mesons, Theory and ExperimentJul 26 2000In this talk I summarize the status of exotic mesons, including both theoretical expectations and experimental candidates. The current experimental candidates are ``spin-parity exotics''; since these are most often considered possible hybrid mesons, the ... More
Signatures for HybridsOct 14 1993In this review talk I summarize theoretical expectations for properties of hybrid mesons and baryons, and discuss the prospects for identifying these states experimentally. This is an expanded version of an Invited Contribution to the Conference on Exclusive ... More
Charmonium Physics at a Tau-Charm FactoryAug 31 1993This talk summarizes the status of the charmonium system, with particular emphasis on outstanding problems in QCD spectroscopy which a tau-charm factory can address.
Associated Charmonium Production in p-pbar AnnihilationJan 29 2007In this paper we summarize our recent results for low energy associated charmonium production cross sections, using 1) crossing symmetry, and 2) an explicit hadronic model. These predictions are of relevance to the planned charmonium and charmonium hybrid ... More
MESON2000 Conference SummaryAug 16 2000This short contribution is a {\it lite} MESON2000 conference summary. As appropriate for the 600th anniversary of the Jagellonian University, it begins with a brief summary of the last 600 years of European history and its place in hadron physics. Next ... More
Light Meson Spectroscopy: Recent Developments and DAFNEJan 31 2000In this contribution I discuss recent developments in light meson spectroscopy, and note specific areas in which DAFNE is an especially appropriate tool for future experiments. One topic of special relevance is the spectroscopy of excited vector mesons; ... More
Charmonium production in p pbar annihilation: Estimating cross sections from decay widthsJul 14 2005The cross sections for the charmonium production processes p pbar -> m Psi, where m is a light meson and Psi is a charmonium state, are of great interest for the planned p-pbar experiment PANDA. In this paper we estimate these cross sections using known ... More
Exotics and all thatMar 12 2003This invited contribution summarizes some of the more important aspects of exotics. We review theoretical expectations for exotic and nonexotic hybrid mesons, and briefly discuss the leading experimental candidate for an exotic, the pi_1(1600).
Hadronic Molecules and Low-Energy Hadron-Hadron Scattering AmplitudesJun 21 1994Recently there has been considerable interest in the subject of molecules, which are weakly bound states of hadron pairs. The question of the existence of molecules is closely related to the more general problem of the determination of low energy hadron-hadron ... More
Exploring QCD: from LEAR to GSIMay 31 2003In this invited contribution I briefly review some of the principal topics in hadron spectroscopy that were studied at the CERN low-energy antiproton facility LEAR, from its beginnings in the early 1980s to the present. These topics include the nature ... More
Radial ExcitationsJul 06 1999In this contribution I review recent experimental developments in the spectroscopy of higher-mass mesons, especially candidate radial excitations discussed at the WHS99 meeting in Frascati.
The Status of MoleculesJun 02 1994This report summarizes the experimental and theoretical status of hadronic molecules, which are weakly-bound states of two or more hadrons. We begin with a brief history of the subject and discuss a few good candidates, and then abstract some signatures ... More
Charmonium at BES and CLEO-cJun 29 2004This paper gives a short summary of some of the aspects of charmonium which can be addressed at BES and CLEO-c and other $e^+e^-$ facilities. These topics include the spectroscopy of charmonium states, radiative transitions, $e^+e^-$ widths, two-photon ... More
Charmonium Cross Sections and the QGPJun 09 2003In this short review we summarize experimental information and theoretical results for the low-energy dissociation cross sections of charmonia by light hadrons. These cross sections are required for the simulation of charmonium absorption through collisions ... More
Update on Charmonium TheoryMar 12 2010In this invited presentation I review some recent developments in the theory of charmonium that appear likely to be of importance for future experimental studies in this field. The specific areas considered are double charmonium production, LQCD studies ... More
Higher CharmoniumDec 03 2004This contribution briefly discusses some new theoretical results for the properties of charmonium, especially the "higher charmonium" states above open-charm threshold. In particular we discuss the spectrum of states, open-flavor strong decays, and the ... More
Meson2006 Summary: TheoryAug 15 2006Aug 16 2006This is a summary of theoretical plenary contributions to the biennial hadron physics conference Meson2006, which was the ninth in this series. The topics covered in the meeting include low energy pion-pion and pion-nucleon interactions, photoproduction ... More
The XYZs of Charmonium at BESAug 09 2006This contribution reviews some recent developments in charmonium spectroscopy, and discusses related theoretical predictions. The spectrum of states, strong decays of states above open charm threshold, electromagnetic transitions, and issues related to ... More
Hadron 2001 Conference Summary: TheoryFeb 15 2002This contribution reviews some of the theoretical issues and predictions that were discussed at HADRON2001. The topics are divided into principle areas, 1) exotics, 2) vectors, 3) scalars, and 4) higher-mass states. The current status of theoretical predictions ... More
A Study of the S=1/2 Alternating Chain using Multiprecision MethodsJan 21 1998In this paper we present results for the ground state and low-lying excitations of the $S=1/2$ alternating Heisenberg antiferromagnetic chain. Our more conventional techniques include perturbation theory about the dimer limit and numerical diagonalization ... More
CHARM2010: Theory SummaryDec 31 2010This invited summary gives some concluding remarks regarding theoretical aspects of the research presented at Charm2010. I will specialize to the role of theory and the relative reach of theory and experiment in three of the major areas of charm physics ... More
Hadron-Hadron Scattering in the Nonrelativistic Quark ModelNov 20 2001In this HADRON2001 contribution we summarize the status of our quark-model calculations of hadron-hadron scattering amplitudes in annihilation-free channels. The predictions are in reasonably good agreement with experimentally known S-wave meson-meson ... More
QCD Spectroscopy at Gsi: Exotica and CharmoniaMar 13 2001In this talk I give a short summary of the basics of conventional and exotic meson spectroscopy, and consider in particular those issues in the charmonium and charmonium hybrid sectors which can be addressed by a future antiproton facility at GSI.
Hybrid Baryons, a brief reviewSep 05 2000This contribution is a brief review of the status of hybrid baryons, which are hypothetical baryons that incorporate a gluonic excitation. We first summarize the status of hybrid mesons, since this closely related topic has seen considerable recent activity ... More
Photoproduction of Hybrid MesonsJul 06 1999In this contribution I discuss prospects for photoproducing hybrid mesons at CEBAF, based on recent model results and experimental indications of possible hybrids. One excellent opportunity appears to be a search for the I=1, JPC=2+-, neutral "(b2)o" ... More
(A Few) Recent Developments in Hadron SpectroscopyDec 31 2010Recent years have seen rapid developments in our knowledge and understanding of meson spectroscopy, especially in the charm quark sectors. In my invited overview I discussed some of these recent new developments, including theoretical developments, new ... More
HADRON05 Summary: Heavy Quark Hadrons and TheoryOct 27 2005This HADRON05 summary covers the topics of (1) mesons containing heavy quarks, and (2) theory. The new material discussed here is taken mainly from plenary presentations. We specifically emphasize new or recent results in spectroscopy that are likely ... More
Boundaries, Cusps and Caustics in the Multimagnon Continua of 1D Quantum Spin SystemsApr 04 2002The multimagnon continua of 1D quantum spin systems possess several interesting singular features that may soon be accessible experimentally through inelastic neutron scattering. These include cusps and composition discontinuities in the boundary envelopes ... More
Hadronic Molecules and Scattering Amplitudes from the Nonrelativistic Quark ModelAug 27 1993This report summarizes recent calculations of low-energy hadron-hadron scattering amplitudes in the nonrelativistic quark potential model, which assume that the scattering mechanism is a single interaction (usually OGE) followed by constituent interchange. ... More
High resolution spectroscopy for Cepheids distance determination. III. A relation between gamma-velocities and gamma-asymmetriesApr 08 2008Galactic Cepheids in the vicinity of the Sun have a residual line-of-sight velocity, or gamma-velocity, which shows a systematic blueshift of about 2 km/s compared to an axisymmetric rotation model of the Milky Way. This term is either related to the ... More
Energy Loss, Electron Screening, and the Astrophysical 3He(d,p)4He cross sectionDec 11 1995Jan 02 1996We reanalyze the low-energy 3He(d,p)4He cross section measurements of Engstler et al. using recently measured energy loss data for proton and deuteron beams in a helium gas. Although the new 3He(d,p)4He S-factors are significantly lower than those reported ... More
Associated Charmonium Production in Low Energy p-pbar AnnihilationNov 28 2006Dec 11 2006The QCD mechanisms underlying the exclusive strong decays and hadronic production amplitudes of charmonium remain poorly understood, despite decades of study and an increasingly detaled body of experimental information. One set of hadronic channels of ... More
The susceptibility and excitation spectrum of (VO)$_2$P$_2$O$_7$ in ladder and dimer chain modelsApr 19 1994We present numerical results for the magnetic susceptibility of a Heisenberg antiferromagnetic spin ladder, as a function of temperature and the spin-spin interaction strengths $J_\perp$ and $J_{||}$. These are contrasted with new bulk limit results for ... More
CEBAF at Higher EnergiesJul 14 1994This report summarizes topics in hadron spectroscopy and production which could be addressed at CEBAF with an energy upgrade to $E_\gamma=8$ GeV and beyond. The topics discussed include conventional meson and baryon spectroscopy, spectroscopy of exotica ... More
Distribution of exchange energy in a bond-alternating S=1 quantum spin chainOct 30 2003The quasi-one-dimensional bond-alternating S=1 quantum antiferromagnet NTENP is studied by single crystal inelastic neutron scattering. Parameters of the measured dispersion relation for magnetic excitations are compared to existing numerical results ... More
Ages for illustrative field stars using gyrochronology: viability, limitations and errorsApr 23 2007May 17 2007We here develop an improved way of using a rotating star as a clock, set it using the Sun, and demonstrate that it keeps time well. This technique, called gyrochronology, permits the derivation of ages for solar- and late-type main sequence stars using ... More
On the rotational evolution of solar- and late-type stars, its magnetic origins, and the possibility of stellar gyrochronologyMar 28 2003We propose a simple interpretation of the rotation period data for solar- and late-type stars. The open cluster and Mt. Wilson star observations suggest that rotating stars lie primarily on two sequences, initially called I and C. Some stars lie in the ... More
CPN Models in General CoordinatesJan 16 2002An analysis of CPN models is given in terms of general coordinates or arbitrary interpolating fields.Only closed expressions made from simple functions are involved.Special attention is given to CP2 and CP4. In the first of these the retrieval of stereographic ... More
The Fine-Tuning of the Universe for Intelligent LifeDec 20 2011Jun 07 2012The fine-tuning of the universe for intelligent life has received a great deal of attention in recent years, both in the philosophical and scientific literature. The claim is that in the space of possible physical laws, parameters and initial conditions, ... More
Binding the Diproton in Stars: Anthropic Limits on the Strength of GravityDec 18 2015We calculate the properties and investigate the stability of stars that burn via strong (and electromagnetic) interactions, and compare their properties with those that, as in our Universe, include a rate-limiting weak interaction. It has been suggested ... More
A connection between the morphology of the X-ray emission and rotation for solar-type stars in open clustersMar 28 2003It is suggested that the three-segmented morphology of the soft X-ray emission from cluster and field stars may be understood in terms of the recent classification of rotating stars into three kinds: those lying on the convective sequence, on the interface ... More
Gyrochronology and its usage for main sequence cool star agesJun 12 2009The construction of all age indicators consists of certain basic steps which lead to the identification of the properties desirable for stellar age indicators. Prior age indicators for main sequence field stars possess only some of these properties. The ... More
An assessment of the rotation rates of the host stars of extrasolar planetsJul 18 2001The rotation periods of the host stars of extrasolar planets have been assessed against those of the Mt. Wilson stars, open cluster stars, and evolutionary stellar models that include rotation. They appear to be normal, modulo certain inconsistencies ... More
Closed-flavor pi + J/psi and pi + Upsilon Cross Sections at Low Energies from Dipion DecaysJun 05 2003The scale of low energy c-cbar and b-bbar cross sections on light hadrons is of great importance to searches for the quark gluon plasma using the heavy-quarkonium suppression signature. Unfortunately, little is known about these near-threshold cross sections ... More
Kaon-Nucleon Scattering Amplitudes and Z$^*$-Enhancements from Quark Born DiagramsDec 15 1992We derive closed form kaon-nucleon scattering amplitudes using the ``quark Born diagram" formalism, which describes the scattering as a single interaction (here the OGE spin-spin term) followed by quark line rearrangement. The low energy I=0 and I=1 S-wave ... More
Photometric Decomposition of Barred GalaxiesFeb 27 2007We present a non-parametric method for decomposition of the light of disk galaxies into disk, bulge and bar components. We have developed and tested the method on a sample of 68 disk galaxies for which we have acquired I-band photometry. The separation ... More
Hadron Loops: General Theorems and Application to CharmoniumNov 13 2007Mar 05 2009In this paper we develop a formalism for incorporating hadron loops in the quark model. We derive expressions for mass shifts, continuum components and mixing amplitudes of "quenched" quark model states due to hadron loops, as perturbation series in the ... More
Excitation Spectrum and Superexchange Pathways in the Spin Dimer VODPO_4 . 1/2 D_2OApr 10 1997Apr 14 1997Magnetic excitations have been investigated in the spin dimer material VODPO_4 \cdot 1/2 D_2O using inelastic neutron scattering. A dispersionless magnetic mode was observed at an energy of 7.81(4) meV. The wavevector dependence of the scattering intensityfrom ... More
Magnetic Excitations in the S=1/2 Alternating Chain Compound (VO)_2P_2O_7Apr 10 1997Magnetic excitations in an array of (VO)_2P_2O_7 single crystals have been measured using inelastic neutron scattering. Until now, (VO)_2P_2O_7 has been thought of as a two-leg antiferromagnetic Heisenberg spin ladder with chains running in the a-direction. ... More
LO Peg in 1998: Starspot patterns and differential rotationOct 25 2004We present Doppler images of the young K5V - K7V rapid rotator LO Peg from seven nights of continuous spectroscopy obtained in 1998 from July 04 to July 10. The images reveal the presence of a strong polar cap with appendages extending to mid-latitudes, ... More
The redshift evolution of massive galaxy clusters in the MACSIS simulationsJul 15 2016We present the MAssive ClusterS and Intercluster Structures (MACSIS) project, a suite of 390 clusters simulated with baryonic physics that yields realistic massive galaxy clusters capable of matching a wide range of observed properties. MACSIS extends ... More
The redshift evolution of massive galaxy clusters in the MACSIS simulationsJul 15 2016Nov 15 2016We present the MAssive ClusterS and Intercluster Structures (MACSIS) project, a suite of 390 clusters simulated with baryonic physics that yields realistic massive galaxy clusters capable of matching a wide range of observed properties. MACSIS extends ... More
The impact of baryons on massive galaxy clusters: halo structure and cluster mass estimatesJul 28 2016We use the BAHAMAS and MACSIS hydrodynamic simulations to quantify the impact of baryons on the mass distribution and dynamics of massive galaxy clusters, as well as the bias in X-ray and weak lensing mass estimates. These simulations use the sub-grid ... More
A Neutron Scattering Study of Magnetic Excitations in the Spin Ladder (VO)2P2O7Jul 08 1996In this letter we report results from inelastic neutron scattering experiments on powder samples of vanadyl pyrophosphate, (VO)2P2O7. We see evidence for three magnetic excitations, at 3.5 meV, 6.0 meV and 14 meV. The intensity of the 3.5 meV mode is ... More
The impact of baryons on massive galaxy clusters: halo structure and cluster mass estimatesJul 28 2016Nov 07 2016We use the BAHAMAS and MACSIS hydrodynamic simulations to quantify the impact of baryons on the mass distribution and dynamics of massive galaxy clusters, as well as the bias in X-ray and weak lensing mass estimates. These simulations use the sub-grid ... More
gamma Doradus pulsation in two pre-main sequence stars discovered by CoRoTJan 06 2013Pulsations in pre-main sequence stars have been discovered several times within the last years. But nearly all of these pulsators are of delta Scuti-type. gamma Doradus-type pulsation in young stars has been predicted by theory, but lack observational ... More
The accuracy of stellar atmospheric parameter determinations: a case study with HD 32115 and HD 37594Jun 22 2011We present detailed parameter determinations of two chemically normal late A-type stars, HD 32115 and HD 37594, to uncover the reasons behind large discrepancies between two previous analyses of these stars performed with a semi-automatic procedure and ... More
An optimal single-electron charge qubit for solid-state double quantum dotsMar 16 2016We report on an optimal single-electron charge qubit for a solid-state double quantum dot (DQD) system and analyse its dynamics under a time-dependent linear detuning, using GPU accelerated numerical solutions to the time-dependent Schr\"odinger equation. ... More
Gyrokinetic simulation of entropy cascade in two-dimensional electrostatic turbulenceMar 20 2010Aug 16 2010Two-dimensional electrostatic turbulence in magnetized weakly-collisional plasmas exhibits a cascade of entropy in phase space [Phys. Rev. Lett. 103, 015003 (2009)]. At scales smaller than the gyroradius, this cascade is characterized by the dimensionless ... More
Spin polarization control through resonant states in an Fe/GaAs Schottky barrierSep 24 2008Spin polarization of the tunnel conductivity has been studied for Fe/GaAs junctions with Schottky barriers. It is shown that band matching of resonant interface states within the Schottky barrier defines the sign of spin polarization of electrons transported ... More
Ground-state electronic structure of quasi-one-dimensional wires in semiconductor heterostructuresSep 08 2015Oct 20 2016We apply density functional theory, in the local density approximation, to a quasi-one-dimensional electron gas in order to quantify the effect of Coulomb and correlation effects in modulating, and therefore patterning, the charge density distribution. ... More
Similar complex kinematics within two massive, filamentary infrared dark cloudsJan 19 2018Infrared dark clouds (IRDCs) are thought to be potential hosts of the elusive early phases of high-mass star formation. Here we conduct an in-depth kinematic analysis of one such IRDC, G034.43+00.24 (Cloud F), using high sensitivity and high spectral ... More
Evidence for a J/psi-ppbar Pauli Strong Coupling ?Sep 27 2007Jan 01 2008The couplings of charmonia and charmonium hybrids (generically Psi) to ppbar are of great interest in view of future plans to study these states using an antiproton storage ring at GSI. These low to moderate energy Psi-ppbar couplings are not well understood ... More
Higher CharmoniaApr 29 2005Sep 27 2005This paper gives results for the spectrum, all allowed E1 radiative partial widths (and some important M1 widths) and all open-charm strong decay amplitudes of all 40 c-cbar states expected up to the mass of the 4S multiplet, just above 4.4 GeV. The spectrum ... More
Strong Decays of Strange QuarkoniaAug 30 2002In this paper we evaluate strong decay amplitudes and partial widths of strange mesons (strangeonia and kaonia) in the 3P0 decay model. We give numerical results for all energetically allowed open-flavor two-body decay modes of all nsbar and ssbar strange ... More
Mass inflow rate into the Central Molecular Zone: observational determination and evidence of episodic accretionJan 03 2019It is well known that the Galactic bar drives a gas inflow into the Central Molecular Zone, which fuels star formation, accretion onto the central super-massive black hole, and large-scale outflows. This inflow happens mostly through two symmetrical dust-lanes, ... More
Nonlinear phase mixing and phase-space cascade of entropy in gyrokinetic plasma turbulenceNov 16 2008Jun 30 2009Electrostatic turbulence in weakly collisional, magnetized plasma can be interpreted as a cascade of entropy in phase space, which is proposed as a universal mechanism for dissipation of energy in magnetized plasma turbulence. When the nonlinear decorrelation ... More
The Effect of Stochastic Noise on Quantum State TransferApr 15 2002We consider the effect of classical stochastic noise on control laser pulses used in a scheme for transferring quantum information between atoms, or quantum dots, in separate optical cavities via an optical connection between cavities. We develop a master ... More
Meson Emission Model of Psi to N Nbar m Charmonium Strong DecaysJan 08 2010Jan 28 2010In this paper we consider a sequential "meson emission" mechanism for charmonium decays of the type Psi -> N Nbar m, where Psi is a generic charmonium state, N is a nucleon and m is a light meson. This decay mechanism, which may not be dominant in general, ... More
I=3/2 $K π$ Scattering in the Nonrelativisitic Quark Potential ModelJul 21 1992We study $I=3/2$ elastic $K\pi $ scattering to Born order using nonrelativistic quark wavefunctions in a constituent-exchange model. This channel is ideal for the study of nonresonant meson-meson scattering amplitudes since s-channel resonances do not ... More
3.2 mm lightcurve observations of (4) Vesta and (9) Metis with the Australia Telescope Compact ArrayMar 09 2007(4) Vesta and (9) Metis are large main-belt asteroids with high albedos. With millimetre-observations at 93.0 and 95.5 GHz we characterised the emission properties of the surface material. The coverage of the full rotation period allowed a detailed study ... More
Helioseismology of Pre-Emerging Active Regions I: Overview, Data, and Target Selection CriteriaMar 06 2013This first paper in a series describes the design of a study testing whether pre-appearance signatures of solar magnetic active regions were detectable using various tools of local helioseismology. The ultimate goal is to understand flux-emergence mechanisms ... More
Meson-Meson Scattering in the Quark Model: Spin Dependence and Exotic ChannelsJul 11 2000We apply a quark interchange model to spin-dependent and exotic meson-meson scattering. The model includes the complete set of standard quark model forces, including OGE spin-orbit and tensor and scalar confinement spin-orbit. Scattering amplitudes derived ... More
The Cluster-EAGLE project: velocity bias and the velocity dispersion - mass relation of cluster galaxiesAug 01 2017Nov 21 2017We use the Cluster-EAGLE simulations to explore the velocity bias introduced when using galaxies, rather than dark matter particles, to estimate the velocity dispersion of a galaxy cluster, a property known to be tightly correlated with cluster mass. ... More
An In-Depth Spectroscopic Analysis of RR Lyr Variations over the Pulsation CycleOct 16 2014The stellar parameters of RR Lyrae stars vary considerably over a pulsation cycle, and their determination is crucial for stellar modelling. We present a detailed spectroscopic analysis of the pulsating star RR Lyr, the prototype of its class, over a ... More
The Helioseismic and Magnetic Imager (HMI) Vector Magnetic Field Pipeline: Optimization of the Spectral Line Inversion CodeMar 14 2014The Very Fast Inversion of the Stokes Vector (VFISV) is a Milne-Eddington spectral line inversion code used to determine the magnetic and thermodynamic parameters of the solar photosphere from observations of the Stokes vector in the 6173 A Fe I line ... More
Widespread deuteration across the IRDC G035.39-00.33Feb 18 2016Infrared Dark Clouds (IRDCs) are cold, dense regions that are usually found within Giant Molecular Clouds (GMCs). Ongoing star formation within IRDCs is typically still deeply embedded within the surrounding molecular gas. Characterising the properties ... More
Long-range electronic reconstruction to a $d_{xz,yz}$-dominated Fermi surface below the LaAlO$_3$/SrTiO$_3$ interfaceJun 20 2014Low dimensionality, broken symmetry and easily-modulated carrier concentrations provoke novel electronic phase emergence at oxide interfaces. However, the spatial extent of such reconstructions - i.e. the interfacial "depth" - remains unclear. Examining ... More
On the Origins of the High-Latitude H-alpha BackgroundOct 21 2010The diffuse high-latitude H-alpha background is widely believed to be predominantly the result of in-situ recombination of ionized hydrogen in the warm interstellar medium of the Galaxy. Instead, we show that both a substantial fraction of the diffuse ... More
The Vortex Signature of Discrete Ferromagnetic Dipoles at the LaAlO$_3$/SrTiO$_3$ InterfaceNov 11 2013A hysteretic in-plane magnetoresistance develops below the superconducting transition of LaAlO$_3$/SrTiO$_3$ interfaces for $\left|H_{/\!/}\right|<$ 0.15 T, independently of the carrier density or oxygen annealing. We show that this hysteresis arises ... More
Theory of semi-ballistic wave propagationJan 11 1996Wave propagation through waveguides, quantum wires or films with a modest amount of disorder is in the semi-ballistic regime when in the transversal direction(s) almost no scattering occurs, while in the long direction(s) there is so much scattering that ... More
Effect of the spin-orbit interaction on the band structure and conductance of quasi-one-dimensional systemsOct 27 1999We discuss the effect of the spin-orbit interaction on the band structure, wave functions and low temperature conductance of long quasi-one-dimensional electron systems patterned in two-dimensional electron gases (2DEG). Our model for these systems consists ... More
Normal zone in $YBa_2Cu_3O_{6+x}$-coated conductorsJun 27 2007We consider the distribution of an electric field in YBCO-coated conductors for a situation in which the DC transport current is forced into the copper stabilizer due to a weak link -- a section of the superconducting film with a critical current less ... More
Uncertainties in Spiral Galaxy Projection ParametersNov 11 2002Nov 18 2002We investigate the impact of nonaxisymmetric structure on estimates of galaxy inclinations and position angles. A new minimization technique is used to obtain estimates of inclination and position angle from a global fit to either photometric or kinematic ... More
SS433:the microquasar link with ULXs?Feb 03 2004SS433 is the prototype microquasar in the Galaxy and may even be analogous to the ULX sources if the jets' kinetic energy is taken into account. However, in spite of 20 years of study, our constraints on the nature of the binary system are extremely limited ... More
Concept of Multiply Connected Superconducting TapesNov 16 2004The possibility of a substantial reduction of weight and size of electrical generators is the main incentive behind the effort to develop superconducting armature windings based on coated conductors in the form of wide tapes with large aspect ratio. The ... More
The Saga of $h_c$ and $h_b$ Search in Heavy QuarkoniaAug 05 2004In this brief review, we examine carefully and critically the status of search for the $h_c$ [$\psi(1^1P_1)$] charmonium state and the $h_b$ [$\Upsilon(1^1P_1)$] bottonium state, initiated by the E760 experiment. Recent experimental studies at CLEO/BABAR/BELLE ... More
A joint model for the emission and absorption properties of damped Lyman alpha absorption systemsSep 29 2008The recently discovered population of ultra-faint extended line emitters can account for the majority of the incidence rate of Damped Lyman Alpha systems (DLAs) at z ~ 3 if the line emission is interpreted as Ly alpha. We show here that a model similar ... More
Angular Momentum Loss from Cool Stars: An Empirical Expression and Connection to Stellar ActivityApr 12 2011We show here that the rotation period data in open clusters allow the empirical determination of an expression for the rate of loss of angular momentum from cool stars on the main sequence. One significant component of the expression, the dependence on ... More
The Integration of YBCO Coated Conductors into Magnets and Rotating MachinerySep 13 2005The implementation of the 2nd generation high-Tc superconductors in power applications, such as electrical transformers, motors and generators requires superconducting wires that are superior to copper Litz wires at cryogenic temperatures in terms of ... More
Baryonic Distributions in Galaxy Dark Matter Haloes I: New Observations of Neutral and Ionized Gas KinematicsMay 05 2016We present a combination of new and archival neutral hydrogen (HI) observations and new ionized gas spectroscopic observations for sixteen galaxies in the statistically representative EDGES kinematic sample. HI rotation curves are derived from new and ... More
The spin-orbit interaction as a source of new spectral and transport properties in quasi-one-dimensional systemsDec 13 1999We present an exact theoretical study of the effect of the spin-orbit (SO) interaction on the band structure and low temperature transport in long quasi-one-dimensional electron systems patterned in two-dimensional electron gases in zero and weak magnetic ... More
The bias of DLAs at z ~ 2.3: contraining stellar feedback in shallow potential wellsMar 07 2014Nov 05 2015We discuss the recent Baryon Oscillation Spectroscopic Survey measurement of a rather high bias factor for the host galaxies/haloes of Damped Lyman-alpha Absorbers (DLAs), in the context of our previous modelling of the physical properties of DLAs within ... More
Faint extended Lyalpha emission due to star formation at the centre of high-column density QSO absorption systemsDec 08 2009We use detailed Lyalpha radiative transfer calculations to further test the claim of Rauch et al. (2008) that they have detected spatially extended faint Lyalpha emission from the elusive host population of Damped Lyalpha Absorption systems (DLAs) in ... More
Killing Tensors from Conformal Killing VectorsDec 03 2002Some years ago Koutras presented a method of constructing a conformal Killing tensor from a pair of orthogonal conformal Killing vectors. When the vector associated with the conformal Killing tensor is a gradient, a Killing tensor (in general irreducible) ... More
Prospects for detecting an $η_c'$ in two photon processesMay 10 1996We argue that an experimental search for an $\eta_c'$, the first radial excitation of the $\eta_c(2980)$, may be carried out using the two photon process $e^+e^- \to e^+e^- \gamma \gamma \ra e^+e^-\eta_c'$. We estimate the partial width $\Gamma_{\gamma ... More
Neutron Scattering and Magnetic Observables for S = 1/2 Molecular MagnetsAug 11 2004Dec 22 2004In this paper we report results for magnetic observables of finite spin clusters composed of S=1/2 ions. We consider clusters of two, three and four spins in distinct spatial arrangements, with isotropic Heisenberg interactions of various strengths between ... More
Structure of Titan's evaporitesDec 22 2015Numerous geological features that could be evaporitic in origin have been identified on the surface of Titan. Although they seem to be water-ice poor, their main properties -chemical composition, thickness, stratification- are essentially unknown. In ... More