cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Marginal operators and supersymmetry enhancement in 3d $S$-fold SCFTs
Creators: name: Beratto, Emanuele
name: Mekareeya, Noppadol
name: Sacchi, Matteo
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The study of exactly marginal deformations of superconformal field theories is a topic that has received considerable attention due to their rich properties. We investigate the $\mathcal{N}=2$ preserving exactly marginal operators of 3d $S$-fold SCFTs. Two families of such theories are considered: one is constructed by gauging the diagonal flavour symmetry of the $T(U(2))$ and $T(U(3))$ theories, and the other by gauging the diagonal flavour symmetry of the $T^{[2,1^2]}_{[2,1^2]}(SU(4))$ theory. In both families, it is possible to turn on a Chern--Simons level for each gauge group and to couple to each theory various numbers of hypermultiplets. The detailed analysis of the exactly marginal operators, along with the superconformal indices, allows us to determine whether supersymmetry gets enhanced in the infrared and to deduce the amount of supersymmetry of the corresponding SCFT.
description: 53 pages, 6 figures; v2: references added, version published on JHEP
Factors Affecting the Binding of a Recombinant Heavy Metal-Binding Domain (CXXC motif) Protein to Heavy Metals
Creators: name: Boonyodying, Kamala
name: Thanakorn Watcharasupat
name: Waranan Yotpanya
name: Thawatchai Kitti
name: Wanna Kawang
name: Duangkamol Kunthalert
name: Sutthirat Sitthisak
Publisher: name: Thai Society of Higher Education Institutes on Environment
Year: 2012
Subjects: heavy metal binding proteins,bioremediation,heavy metals,binding factors,CXXC motif

description: 2, 5, EnvironmentAsia
Cosmology Requirements on Supernova Photometric Redshift Systematics for Rubin LSST and Roman Space Telescope
Creators: name: Mitra, Ayan
name: Linder, Eric V.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Some million Type Ia supernovae (SN) will be discovered and monitored during upcoming wide area time domain surveys such as the Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST). For cosmological use, accurate redshifts are needed among other characteristics; however the vast majority of the SN will not have spectroscopic redshifts, even for their host galaxies, only photometric redshifts. We assess the redshift systematic control necessary for robust cosmology. Based on the photometric vs true redshift relation generated by machine learning applied to a simulation of 500,000 galaxies as observed with LSST quality, we quantify requirements on systematics in the mean relation and in the outlier fraction and deviance so as not to bias dark energy cosmological inference. Certain redshift ranges are particularly sensitive, motivating spectroscopic followup of SN at $z\lesssim0.2$ and around $z\approx0.5$-0.6. Including Nancy Grace Roman Space Telescope near infrared bands in the simulation, we reanalyze the constraints, finding improvements at high redshift but little at the low redshifts where systematics lead to strong cosmology bias. We identify a complete spectroscopic survey of SN host galaxies for $z\lesssim0.2$ as a highly favored element for robust SN cosmology.
description: Accepted in PRD. 9 pages, 11 figures
Assessment of Vegetation Variation on Primarily Creation Zones of the Dust Storms Around the Euphrates Using Remote Sensing Images
Creators: name: Amanollahi, Jamil
name: Kboodvandpour, Shahram
name: Abdullah, Ahmad Makmom
name: Parinaz Rashidi
Publisher: name: Thai Society of Higher Education Institutes on Environment
Year: 2012
Subjects: Landsat TM5,NDVI,MODIS,dust storm,Iran

description: 2, 5, EnvironmentAsia
Manifestation of GIS Tools for Spatial Pattern Distribution Analysis of Dengue Fever Epidemic in the City of Subang Jaya, Malaysia
Creators: name: Nazri Che Dom
name: Zulkiflee Abd Latif
name: Ahmad, Abu Hassan
name: Rodziah Ismail
name: Biswajeet Pradhan
Publisher: name: Thai Society of Higher Education Institutes on Environment
Year: 2012
Subjects: spatial pattern distribution,dengue fever,Subang Jaya,Malaysia

description: 2, 5, EnvironmentAsia
On the robustness of spin polarization for magnetic vortex accelerated proton bunches in density down-ramps
Creators: name: Reichwein, Lars
name: Hützen, Anna
name: Büscher, Markus
name: Pukhov, Alexander
Publisher: name: arXiv
Year: 2021
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: We investigate the effect of density down-ramps on the acceleration of ions via Magnetic Vortex Acceleration (MVA) in a near-critical density gas target by means of particle-in-cell simulations. The spin-polarization of the accelerated protons is robust for a variety of ramp lengths at around 80%. Significant increase of the ramp length is accompanied by collimation of low-polarization protons into the final beam and large transverse spread of the highly polarized protons with respect to the direction of laser propagation.
description: 10 pages, 4 figures
Random matrix central limit theorems for nonintersecting random walks
Creators: name: Baik, Jinho
name: Suidan, Toufic M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60F05 (Primary)

description: We consider nonintersecting random walks satisfying the condition that the increments have a finite moment generating function. We prove that in a certain limiting regime where the number of walks and the number of time steps grow to infinity, several limiting distributions of the walks at the mid-time behave as the eigenvalues of random Hermitian matrices as the dimension of the matrices grows to infinity.
description: Published in at http://dx.doi.org/10.1214/009117906000001105 the Annals of Probability (http://www.imstat.org/aop/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Spectral Flexibility of Symplectic Manifolds T^2 x M
Creators: name: Mangoubi, Dan
Publisher: name: arXiv
Year: 2005
Subjects: subject: Spectral Theory (math.SP)
subject: Symplectic Geometry (math.SG)
subject: FOS: Mathematics
subject: 35P15; 53D05; 53C17

description: We consider Riemannian metrics compatible with the natural symplectic structure on T^2 x M, where T^2 is a symplectic 2-Torus and M is a closed symplectic manifold. To each such metric we attach the corresponding Laplacian and consider its first positive eigenvalue λ_1. We show that λ_1 can be made arbitrarily large by deforming the metric structure, keeping the symplectic structure fixed. The conjecture is that the same is true for any symplectic manifold of dimension >= 4. We reduce the general conjecture to a purely symplectic question.
description: 15 Pages; introduction revised; to appear in Math. Ann
Lexical and sentence elicitation
Creators: name: Arahuanaza, Dionisia
name: Arahuanaza, Lidia
name: Mucushua, Juan
name: Sandi, María
name: Escamilla, Ramón
name: Michael, Lev
name: Piqueras-Brunet, Marta
name: Beier, Christine
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2021
Subjects: subject: anb

description: Contains two WAV audio files:
20090617_anb_md_01: 2h 05m; group elicitation: Juan Mucushua.
20090617_anb_md_02: 1h 31m; group elicitation: María Sandi.
Multi-Phase Galaxy Formation and Quasar Absorption Systems
Creators: name: Maller, Ariyeh H.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The central problem of galaxy formation is understanding the cooling and condensation of gas in dark matter halos. It is now clear that to match observations this requires further physics than the simple assumptions of single phase gas cooling. A model of multi-phase cooling (Maller & Bullock 2004) can successfully account for the upper cutoff in the masses of galaxies and provides a natural explanation of many types of absorption systems (Mo & Miralda-Escude 1996). Absorption systems are our best probes of the gaseous content of galaxy halos and therefore provide important constraints on models for gas cooling into galaxies. All physical processes that effect gas cooling redistribute gas and therefore are detectable in absorption systems. Detailed studies of the nature of gas in galaxy halos using absorption systems are crucial for building a correct theory of galaxy formation.
description: 6 pages, 3 figures, to appear in IAU Colloquium 199, Probing Galaxies through quasar absorption lines
Radiative heating achieves the ultimate regime of thermal convection
Creators: name: Lepot, Simon
name: Aumaître, Sébastien
name: Gallet, Basile
Publisher: name: arXiv
Year: 2020
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The absorption of light or radiation drives turbulent convection inside stars, supernovae, frozen lakes and the Earth's mantle. In these contexts, the goal of laboratory and numerical studies is to determine the relation between the internal temperature gradients and the heat flux transported by the turbulent flow. This is the constitutive law of turbulent convection, to be input into large-scale models of such natural flows. However, in contrast with the radiative heating of natural flows, laboratory experiments have focused on convection driven by heating and cooling plates: the heat transport is then severely restricted by boundary layers near the plates, which prevents the realization of the mixing-length scaling-law used in evolution models of geophysical and astrophysical flows. There is therefore an important discrepancy between the scaling-laws measured in laboratory experiments and those used eg. in stellar evolution models. Here we provide experimental and numerical evidence that radiatively driven convection spontaneously achieves the mixing-length scaling regime, also known as the `ultimate' regime of thermal convection. This constitutes the first clear observation of this regime of turbulent convection. Our study therefore bridges the gap between models of natural flows and laboratory experiments. It opens an experimental avenue for a priori determinations of the constitutive laws to be implemented into models of geophysical and astrophysical flows, as opposed to empirical fits of these constitutive laws to the scarce observational data.
Polarons and confinement of electronic motion to two dimensions in a layered transition metal oxide
Creators: name: Ronnow, H. M.
name: Renner, Ch.
name: Aeppli, G.
name: Kimura, T.
name: Tokura, Y.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: A very remarkable feature of the layered transition metal oxides (TMOs), whose most famous members are the high-temperature superconductors (HTSs), is that even though they are prepared as bulk three-dimensional single crystals, they display hugely anisotropic electrical and optical properties, seeming to be insulating perpendicular to the layers and metallic within them. This is the phenomenon of confinement, a concept at odds with the conventional theory of solids and recognized as due to magnetic and electron-lattice interactions in the layers which must be overcome at a substantial energy cost if electrons are to be transferred between layers. The associated energy gap or 'pseudogap' is particularly obvious in experiments where charge is moved perpendicular to the planes, most notably scanning tunneling microscopy (STM) and polarized infrared spectroscopy. Here, using the same experimental tools, we show that there is a second family of TMOs - the layered manganites La2-2xSr1+2xMn2O7 (LSMO) - with even more extreme confinement and pseudogap effects. The data, which are the first to resolve atoms in any metallic manganite, demonstrate quantitatively that because they are attached to polarons - lattice and spin textures within the planes -, it is equally difficult to remove carriers from the planes via vacuum tunneling into a conventional metallic tip, as it is for them to move between Mn-rich layers within the material itself.
Continuum physics with quenched overlap fermions
Creators: name: Durr, Stephan
name: Hoelbling, Christian
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We calculate $m_{ud}=(m_u+m_d)/2$, $m_s$, $f_π$ and $f_K$ in the quenched continuum limit with UV-filtered overlap fermions. We see rather small scaling violations on lattices as coarse as $a^{-1} \simeq 1 \mathrm{GeV}$ and conjecture that similar advantages would be manifest in unquenched studies.
description: 10 pages, 5 figures, v2: title changed and other improvements to match published version
Cosmic acceleration and crossing of w=-1 barrier in non-local Cubic Superstring Field Theory model
Creators: name: Aref'eva, I. Ya.
name: Koshelev, A. S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We show that the late time rolling of the Cubic Superstring Field Theory (CSSFT) non-local tachyon in the FRW Universe leads to a cosmic acceleration with a periodic crossing of the w=-1 barrier. An asymptotic solution for the tachyon and Hubble parameter by linearizing the non-local equations of motion is constructed explicitly. For a small Hubble parameter the period of oscillations is a number entirely defined by the parameters of the CSSFT action.
description: 16 pages, 16 eps figures; v2 typos corrected, references added; v3 uses JHEP3
Topological aspects of $4$D Abelian lattice gauge theories with the $θ$ parameter
Creators: name: Honda, Masazumi
name: Tanizaki, Yuya
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We study a four-dimensional $U(1)$ gauge theory with the $θ$ angle, which was originally proposed by Cardy and Rabinovici. It is known that the model has the rich phase diagram thanks to the presence of both electrically and magnetically charged particles. We discuss the topological nature of the oblique confinement phase of the model at $θ=π$, and show how its appearance can be consistent with the anomaly constraint. We also construct the $SL(2,\mathbb{Z})$ self-dual theory out of the Cardy-Rabinovici model by gauging a part of its one-form symmetry. This self-duality has a mixed 't Hooft anomaly with gravity, and its implications on the phase diagram is uncovered. As the model shares the same global symmetry and 't Hooft anomaly with those of $SU(N)$ Yang-Mills theory, studying its topological aspects would provide us more hints to explore possible dynamics of non-Abelian gauge theories with nonzero $θ$ angles.
description: 33 pages, 3 figures (v2) refs added, some discussions added
SLE($κ,ρ$)and Boundary Coulomb Gas
Creators: name: Moghimi-Araghi, S.
name: Rajabpour, M. A.
name: Rouhani, S.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider the coulomb gas model on the upper half plane with different boundary conditions, namely Drichlet, Neuman and mixed. We related this model to SLE($κ,ρ$) theories. We derive a set of conditions connecting the total charge of the coulomb gas, the boundary charges, the parameters $κ$ and $ρ$. Also we study a free fermion theory in presence of a boundary and show with the same methods that it would lead to logarithmic boundary changing operators.
description: 10 pages, no figure
A Common Origin for Low Mass Ratio Events Observed by LIGO and Virgo in the First Half of the Third Observing Run
Creators: name: Safarzadeh, Mohammadtaher
name: Wysocki, Daniel
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In its third observing run, the LIGO/Virgo collaboration has announced a potential neutron star-black hole (NSBH) merger candidate, GW190426_152155. Together with GW190814, these two events belong to a class of binaries with a secondary mass less than $3 \, M_{\odot}$. While the secondary system in GW190426_152155 is consistent with being a neutron star with a mass of $1.5^{+0.8}_{-0.5} \, M_{\odot}$, that of GW190814 is a $2.59^{+0.08}_{-0.09} \, M_{\odot}$ object and counts as the first confirmed detection of a mass-gap object. Here we argue that these two events could have a common origin as follows: both are formed as NSBH systems; however, the larger escape velocity of a system with more massive primary BH increases the bound fraction of the ejecta material from the supernova explosion leading to the formation of a NS. This bound material forms a disk, which is preferentially accreted onto the NS. This scenario predicts the secondary component mass should correlate with the primary component mass, which is consistent with GW190426_152155 and GW190814. If this hypothesis is corroborated by upcoming observations, GW190814-like events can be excluded from the binary black hole population when inferring their global characteristics.
description: Accepted for publication at ApJ Letters
Lexical and sentence elicitation
Creators: name: Mucushua, Juan
name: Sandi, María
name: Escamilla, Ramón
name: Michael, Lev
name: Piqueras-Brunet, Marta
name: Beier, Christine
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2021
Subjects: subject: anb

description: Contains seven WAV audio files:
20090616_anb_md_01: 38m; group elicitation: Juan Mucushua.
20090616_anb_md_02: 07m; group elicitation: Juan Mucushua.
20090616_anb_md_03: 1h 11m; group elicitation: Juan Mucushua.
20090616_anb_md_04: 02m; group elicitation: Juan Mucushua.
20090616_anb_md_05: 07m; group elicitation: Juan Mucushua.
20090616_anb_md_06: 35m; group elicitation: María Sandi.
20090616_anb_md_07: 21m; group elicitation: María Sandi.
Letter from Larry Cantwell to Betty Franey, January 3, 1980
Creators: name: Cantwell, Larry
Publisher: name: Town of East Hampton
Year: 1980
Subjects: East Hampton
Committees
Meetings
Town meetings
Municipal government
Municipal officials
Correspondence
Springs

description: This letter is from Larry Cantwell, Councilman of the Springs Citizens Advisory Committee, to Betty Franey, President of the Springs Improvement Society, January 3, 1980.
description: This material was lent to the Long Island Collection by the Springs Historical Society Library for digitization purposes.
Charge ordering, stripes and phase separation in manganese perovskite oxides: an STM/STS study
Creators: name: Renner, Ch.
name: Aeppli, G.
name: Ronnow, H. M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: A microscopic characterisation of the phase transitions associated with colossal magnetoresistance (CMR) in manganese perovskite oxides is a very important ingredient in the quest of understanding its underlying mechanism. Scanning tunneling microscopy (STM) is most suitable to investigate some of their reported hallmarks, including charge ordering, lattice distortions, and electronic phase separation. Here we investigate Bi1-XCaXMnO3 (BCMO) with x=0.76. At this composition, BCMO develops an insulating charge-ordered phase upon cooling, whose study as a function of temperature will allow identifying atomic scale characteristics of the metal-insulator phase transition (MIT). We observe distinct atomic scale phases at temperatures above and below the MIT, with very different electronic and structural characteristics. Combining STM micrographs and current-voltage tunneling characteristics, we find that charge ordering correlates both with the local conduction state (metallic or insulating) and the local structural order. Furthermore, STM shows coexistence of these phases as expected for a first order phase transition.
description: Materials Science and Engineering C, (2005). In Press
Neutron-pair structure in the continuum spectrum of $^{26}$O
Creators: name: Affranchino, S.
name: Betan, R. M. Id
Publisher: name: arXiv
Year: 2020
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The structure of $^{26}$O is currently being investigated on both theoretical and experimental fronts. It is well established that it is unbound and the resonance parameters are fairly well-known. The theoretical analysis may involved two- and three-body interactions, as well as correlations with the continuum spectrum of energy. In order to properly assess the structure of the ground and excited states, it is imperative to include a large single particle representation with the right asymptotic behavior. The purpose of this work is to provide details of the single particle continuum configurations of the ground and excited $0^+$ states. We use a large complex energy single particle basis, formed by resonances and complex energy scattering states, the so called Berggren basis, and a separable interaction, which is convenient to solve in a large model space. Three $0^+$ states were found in the complex energy plane. Changes of the resonant parameters, i.e. energy and width, were analyzed as a function of strength of the residual interaction. It is shown how a subtle difference in the interaction could change the unbound character of $^{26}$O into a Borromean nucleus. Only one of the two excited states can be considered as a candidate for a physical meaningful resonance. The calculated occupation probabilities are in agreement with other theoretical approaches although the calculated half live is three-order of magnitude smaller than the experimental one.
description: 7 pages, 5 figures, 5 tables, 47 references
Mach's principle: Exact frame-dragging via gravitomagnetism in perturbed Friedmann-Robertson-Walker universes with $K = (\pm 1, 0)$
Creators: name: Schmid, Christoph
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We show that the dragging of the axis directions of local inertial frames by a weighted average of the energy currents in the universe is exact for all linear perturbations of any Friedmann-Robertson-Walker (FRW) universe with K = (+1, -1, 0) and of Einstein's static closed universe. This includes FRW universes which are arbitrarily close to the Milne Universe, which is empty, and to the de Sitter universe. Hence the postulate formulated by E. Mach about the physical cause for the time-evolution of the axis directions of inertial frames is shown to hold in cosmological General Relativity for linear perturbations. The time-evolution of axis directions of local inertial frames (relative to given local fiducial axes) is given experimentally by the precession angular velocity of gyroscopes, which in turn is given by the operational definition of the gravitomagnetic field. The gravitomagnetic field is caused by cosmological energy currents via the momentum constraint. This equation for cosmological gravitomagnetism is analogous to Ampere's law, but it holds also for time-dependent situtations. In the solution for an open universe the 1/r^2-force of Ampere is replaced by a Yukawa force which is of identical form for FRW backgrounds with $K = (-1, 0).$ The scale of the exponential cutoff is the H-dot radius, where H is the Hubble rate, and dot is the derivative with respect to cosmic time. Analogous results hold for energy currents in a closed FRW universe, K = +1, and in Einstein's closed static universe.
description: 23 pages, no figures. Final published version. Additional material in Secs. I.A, I.J, III, V.H. Additional references
B -> K1 gamma and tests of factorization for two-body non leptonic Bdecays with axial-vector mesons
Creators: name: Nardulli, G.
name: Pham, T. N.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The large branching ratio for B-> K1 gamma recently measured at Belle implies a large B -> K1 transition form factor and large branching ratios for non leptonic B decays involving an axial-vector meson. In this paper we present an analysis of two-body B decays with an axial-vector meson in the final state using naive factorization and the B -> K1 form factors obtained from the measured radiative decays. We find that the predicted B -> J/psi K1 branching ratio is in agreement with experiment. We also suggest that the decay rates of B -> K1 pi, B -> a1 K and B -> b1 K could be used to test the factorization ansatz.
description: 8 pages; 7 new references included and a comment on K2(1430) in the final state added
Oscillations of Hecke Eigenvalues at Primes
Creators: name: Zhao, Liangyi
Publisher: name: arXiv
Year: 2005
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11L07, 11L20, 11F11, 11F25

description: In this paper, we are interested in exploring the cancellation of Hecke eigenvalues twisted with an exponential sums whose amplitude is $\sqrt{n}$ at prime arguments.
Coincidence of Universe age in $Λ$CDM and Milne cosmologies
Creators: name: Kutschera, M.
name: Dyrda, M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The age of the Universe in the $Λ$CDM cosmology with $Ω_{matter}=0.26$ and $Ω_Λ=0.74$ is the same as in the Milne cosmology which correspods to an almost empty universe. In both cases it is a reciprocal Hubble constant, $1/H_0$, that for now preferred value $H_0=71 km/s/Mpc$ is 13.7 billion years. The most curious coincidence is that at the present time, in the $Λ$CDM model the decelerated expansion is exactly compensated by the accelerated expansion, as if the Universe coast for 13.7 billion years.
description: 2 pages, 1 figure, to apear in Acta Physica Polonica B
From a local Green function to molecular charge transport
Creators: name: Albrecht, M.
name: Schnurpfeil, A.
name: Cuniberti, G.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: A local-orbital based ab initio approach to obtain the Green function for large heterogeneous systems is developed. First a Green function formalism is introduced based on exact diagonalization. Then the self energy is constructed from an incremental scheme, rendering the procedure feasible, while at the same time physical insight into different local correlation contributions is obtained. Subsequently the Green function is used in the frame of the Landauer theory and the wide band approximation to calculate the electronic transmission coefficient across molecular junctions. The theory is applied to meta- and para-ditholbenzene linked to gold electrodes and various correlation contributions are analyzed.
Nuclear Structure Study of Some Actinide Nuclei
Creators: name: Alharbi, H. H.
name: Alhendi, H. A.
name: El-Kameesy, S. U.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: A modified version of the previously proposed exponential model with pairing attenuation for the well deformed even-even nuclei has been applied to predict the energy levels of doubly even actinide nuclei. Satisfactory results are obtained by that model as compared with the experimental results. The backbending phenomena are successfully described and discussed. A further comparison with the main previous models has been undertaken to confirm its validity in the heavy nuclei region.
description: Prepared for NUSTAR'05 conference: NUclear STructure, Astrophysics and Reactions, University of Surrey, Guildford, UK, 5-8 Jan 2005
Micellar Crystals in Solution from Molecular Dynamics Simulations
Creators: name: Anderson, J. A.
name: Lorenz, C. D.
name: Travesset, A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Polymers with both soluble and insoluble blocks typically self-assemble into micelles, aggregates of a finite number of polymers where the soluble blocks shield the insoluble ones from contact with the solvent. Upon increasing concentration, these micelles often form gels that exhibit crystalline order in many systems. In this paper, we present a study of both the dynamics and the equilibrium properties of micellar crystals of triblock polymers using molecular dynamics simulations. Our results show that equilibration of single micelle degrees of freedom and crystal formation occurs by polymer transfer between micelles, a process that is described by transition state theory. Near the disorder (or melting) transition, bcc lattices are favored for all triblocks studied. Lattices with fcc ordering are also found, but only at lower kinetic temperatures and for triblocks with short hydrophilic blocks. Our results lead to a number of theoretical considerations and suggest a range of implications to experimental systems with a particular emphasis on Pluronic polymers.
description: 12 pages, 11 figures. Note that some figures are extremely low quality to meet arXiv's file size limits
The definition of the spin current: The angular spin current and its physical consequences
Creators: name: Sun, Qing-feng
name: Xie, X. C.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We find that in order to completely describe the spin transport, apart from spin current (or linear spin current), one has to introduce the angular spin current. The two spin currents respectively describe the translational and rotational motion (precession)of a spin. The definitions of these spin current densities are given and their physical properties are discussed. Both spin current densities appear naturally in the spin continuity equation. Moreover we predict that the angular spin current can also induce an electric field $\vec{E}$, and in particular $\vec{E}$ scales as $1/r^2$ at large distance $r$, whereas the $\vec{E}$ field generated from the linear spin current goes as $1/r^3$.
description: 15 pages, 3 figures. Revised version 2 with major update
Improving the secondary school career preparation program through action research
Creators: name: Dean, Virginia Clare
Publisher: name: University of British Columbia
Year: 2009

description: The initial research question was formulated to address the problem of students not completing the Career Preparation Program (CPP). As a Career Preparation Program Facilitator, I wanted to determine what I could do to increase the number of students who complete the program. I chose action research to address the question because it is a tool to analyze and investigate the researcher's own practice. Other research questions formulated include: Is the CPP worth having more students complete it?; Is it a failure if a student who begins the program does not complete it if she still gains some benefit?; Is the CPP the best Career Program for our students?; Does the stigma attached to vocational education affect the participation of students and others in the CPP? However, the most important question to me was: What constitutes a successful CPP experience for individual students? Three research methods were used to achieve triangulation. Using questionnaires, I surveyed students in grades eleven and twelve about barriers to completion of the CPP. A student focus group and journals, as well as my own journal, were used to address both the initial research question and the subsequent research questions. The main barriers to completion of the program by students were: some did not qualify for the program; uncertainly about which career area to prepare for; some did not know what the CPP is; and some were unable to fit the courses required in their program into their timetables. The findings from the research showed that the CPP is a worthwhile program that benefits most students to varying degrees. However, there is a need for a variety of Career Programs to meet the needs of students who may not qualify for the CPP, have different career exploration needs, or are too young to participate in it. Students in the CFP achieve varying degrees of personal success through the individual experiences that they have in the program. The ongoing debate between a liberal arts or a vocational education impacts the CPF and may affect the attitudes of the people who are involved in the program.
Multi-ring, stripe, and super-lattice solitons in a spin-orbit coupled spin-1 condensate
Creators: name: Adhikari, S. K.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We demonstrate exotic stable quasi-two-dimensional solitons in a Rashba or a Dresselhaus spin-orbit (SO) coupled hyperfine spin-1 ($F=1$) trap-less antiferromagnetic Bose-Einstein condensate using the mean-field Gross-Pitaevskii equation. For weak SO coupling, the solitons are of the $(-1,0,+1)$ or $(+1,0,-1)$ type with intrinsic vorticity, for Rashba or Dresselhaus SO coupling, where the numbers in the parentheses denote angular momentum in spin components $F_z= +1,0,-1$, respectively. For intermediate SO coupling, the solitons have multi-ring structure maintaining the above-mentioned vortices in respective components. For larger SO coupling, superlattice solitons with a square-lattice structure in total density are found in addition to stripe solitons with stripe pattern in component densities with no periodic modulation in total density.
Frustrated ferromagnetic spin-1/2 chain in a magnetic field: The phase diagram and thermodynamic properties
Creators: name: Heidrich-Meisner, F.
name: Honecker, A.
name: Vekua, T.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The frustrated ferromagnetic spin-1/2 Heisenberg chain is studied by means of a low-energy field theory as well as the density-matrix renormalization group and exact diagonalization methods. Firstly, we study the ground-state phase diagram in a magnetic field and find an `even-odd' (EO) phase characterized by bound pairs of magnons in the region of two weakly coupled antiferromagnetic chains. A jump in the magnetization curves signals a first-order transition at the boundary of the EO phase, but otherwise the curves are smooth. Secondly, we discuss thermodynamic properties at zero field, where we confirm a double-peak structure in the specific heat for moderate frustrating next-nearest neighbor interactions.
description: 4 pages RevTex4, 4 figures. Minor changes, title modified. Additional material is available here: http://www.theorie.physik.uni-goettingen.de/~honecker/j1j2-td/
Silicon carbide diodes for neutron detection
Creators: name: Coutinho, José
name: Torres, Vitor J. B.
name: Capan, Ivana
name: Brodar, Tomislav
name: Ereš, Zoran
name: Bernat, Robert
name: Radulović, Vladimir
name: Ambrožič, Klemen
name: Snoj, Luka
name: Pastuović, Željko
name: Sarbutt, Adam
name: Ohshima, Takeshi
name: Yamazaki, Yuichi
name: Makino, Takahiro
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In the last two decades we have assisted to a rush towards finding a He3-replacing technology capable of detecting neutrons emitted from fissile isotopes. The demand stems from applications like nuclear war-head screening or preventing illicit traffic of radiological materials. Semiconductor detectors stand among the stronger contenders, particularly those based on materials possessing a wide band gap like silicon carbide. We review the workings of SiC-based neutron detectors, along with several issues related to material properties, device fabrication and testing. The paper summarizes the experimental and theoretical work carried out within the E-SiCure project, co-funded by the NATO SPS Programme. Among the achievements, we have the development of successful Schottky barrier based detectors and the identification of the main carrier life-time-limiting defects in the SiC active areas, either already present in pristine devices or introduced upon exposure to radiation fields. The physical processes involved in neutron detection are described. Material properties as well as issues related to epitaxial growth and device fabrication are addressed. The presence of defects in as-grown material, as well as those introduced by ionizing radiation are reported. We finally describe several experiments carried out at the Jozef Stefan Institute TRIGA Mark II reactor (Ljubljana, Slovenia), where a set of SiC-based neutron detectors were tested, some of which being equipped with a thermal neutron converter layer. We show that despite the existence of large room for improvement, Schottky barrier diodes based on state-of-the-art 4H-SiC are closing the gap regarding the sensitivity offered by gas-based and that of semiconductor detectors.
Intrinsically linked graphs and even linking number
Creators: name: Fleming, Thomas
name: Diesl, Alexander
Publisher: name: arXiv
Year: 2005
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 57M15, 57M25,05C10

description: We study intrinsically linked graphs where we require that every embedding of the graph contains not just a non-split link, but a link that satisfies some additional property. Examples of properties we address in this paper are: a two component link with lk(A,L) = k2^r, k not 0, a non-split n-component link where all linking numbers are even, or an n-component link with components L, A_i where lk(L,A_i) = 3k, k not 0. Links with other properties are considered as well. For a given property, we prove that every embedding of a certain complete graph contains a link with that property. The size of the complete graph is determined by the property in question.
description: Published by Algebraic and Geometric Topology at http://www.maths.warwick.ac.uk/agt/AGTVol5/agt-5-55.abs.html
Hierarchical Multi-timescale Framework For Operation of Dynamic Community Microgrid
Creators: name: Shirsat, Ashwin
name: Muthukaruppan, Valliappan
name: Hu, Rongxing
name: Lu, Ning
name: Baran, Mesut
name: Lubkeman, David
name: Tang, Wenyuan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Distribution system integrated community microgrids (CMGs) can restore loads during extended outages. The CMG is challenged with limited resource availability, absence of a robust grid-support, and demand-supply uncertainty. To address these challenges, this paper proposes a three-stage hierarchical multi-timescale framework for scheduling and real-time (RT) dispatch of CMGs. The CMG's ability to dynamically expand its boundary to support the neighboring grid sections is also considered. The first stage solves a stochastic day-ahead (DA) scheduling problem to obtain referral plans for optimal resource rationing. The intermediate near real-time scheduling stage updates the DA schedule closer to the dispatch time, followed by the RT dispatch stage. The proposed methodology is validated via numerical simulations on a modified IEEE 123-bus system, which shows superior performance in terms of RT load supplied under different forecast error cases, outage duration scenarios, and against the traditionally used two-stage approach.
description: Submitted to 2021 IEEE PES General Meeting
Radial and vertical epicyclic frequencies of Keplerian motion in the field of Kerr naked singularities - comparison with the black hole case and possible instability of naked singularity accretion discs
Creators: name: Torok, Gabriel
name: Stuchlik, Zdenek
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Relativistic Keplerian orbital frequency and related epicyclic frequencies play an important role in physics of accretion discs orbiting Kerr black holes and can by resonant or trapping effects explain quasiperiodic oscillations observed in microquasars. Because of growing theoretical evidence on possible existence of naked singularities, we discuss behaviour of the fundamenal orbital frequencies for Keplerian motion in the field of Kerr naked singularities, primarily in order to find phenomena that could observationally distinguish a hypothetical naked singularity from black holes. Some astrophysically important consequences are sketched, namely the existence of strong resonant frequency for all Kerr naked singularities, with radial and vertical epicyclic frequencies being equal at well defined radius.
description: 15 pages, 12 figures
Biological Information
Creators: name: Jost, Jürgen
Publisher: name: arXiv
Year: 2020
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: FOS: Biological sciences
subject: FOS: Physical sciences
subject: G.3
subject: 94A15, 94A17, 94-01

description: In computer science, we can theoretically neatly separate transmission and processing of information, hardware and software, and programs and their inputs. This is much more intricate in biology, Nevertheless, I argue that Shannon's concept of information is useful in biology, although its application is not as straightforward as many people think. In fact, the recently developed theory of information decomposition can shed much light on the complementarity between coding and regulatory, or internal and environmental information. The key challenge that we formulate in this contribution is to understand how genetic information and external factors combine to create an organism, and conversely, how the genome has learned in the course of evolution how to harness the environment, and analogously, how coding, regulation and spatial organization interact in cellular processes.
description: to appear in Theory in Biosciences
Large Sieve Inequalities for Characters to Powerful Moduli
Creators: name: Baier, Stephan
name: Zhao, Liangyi
Publisher: name: arXiv
Year: 2005
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11B57, 11L07, 11L40

description: In this paper we aim to generalize the results in Baier and Zhao and develop a general formula for large sieve with characters to powerful moduli that will be an improvement to the result of Zhao.
CHIANTI -- an atomic database for emission lines -- Paper XVI: Version 10, further extensions
Creators: name: Del Zanna, G.
name: Dere, K. P.
name: Young, P. R.
name: Landi, E.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present version 10 of the CHIANTI package. In this release, we provide updated atomic models for several helium-like ions and for all the ions of the beryllium, carbon and magnesium isoelectronic sequences that are abundant in astrophysical plasmas. We include rates from large-scale atomic structure and scattering calculations that are in many cases a significant improvement over the previous version, especially for the Be-like sequence, which has useful line diagnostics to measure the electron density and temperature. We have also added new ions and updated several of them with new atomic rates and line identifications. Also, we have added several improvements to the IDL software, to speed up the calculations and to estimate the suppression of dielectronic recombination.
description: Accepted for publication in ApJ
Electric Quadrupole Moment of a Hydrogenlike Ion in $s$ and $p_{1/2}$ States
Creators: name: Kozhedub, Y. S.
name: Shabaev, V. M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: Relativistic formulas for the electric quadrupole moment of a hydrogenlike atom, induced by the hyperfine interaction, are derived for $ns_{1/2}$ and $np_{1/2}$ states. Both the magnetic dipole and electric quadrupole hyperfine interactions are taken into account. The formulas are valid for ions with arbitrary nuclear charge and spin. The induced quadrupole moment is compared with the nuclear quadrupole moment for a wide range of hydrogenlike ions.
description: The values for the total quadrupole moment have been corrected for states with F=I-1/2. 8 pages, 2 tables
LOC program for line radiative transfer
Creators: name: Juvela, M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Radiative transfer modelling is part of many astrophysical simulations and is used to make synthetic observations and to assist analysis of observations. We concentrate on the modelling of the radio lines emitted by the interstellar medium. In connection with high-resolution models, this can be significant computationally challenge. Our goal is a line radiative transfer (RT) program that makes good use of multi-core CPUs and GPUs. Parallelisation is essential to speed up computations and to enable the tackling of large modelling tasks with personal computers. The program LOC is based on ray-tracing and uses standard accelerated lambda iteration (ALI) methods for faster convergence. The program works on 1D and 3D grids. The 1D version makes use of symmetries to speed up the RT calculations. The 3D version works with octree grids and, to enable calculations with large models, is optimised for low memory usage. Tests show that LOC gives results that are in agreement with other RT codes to within ~2%. This is typical of code-to-code differences, which often are related to different interpretations of the model set-up. LOC run times compare favourably with those of Monte Carlo codes. In 1D tests, LOC runs were by up to a factor ~20 faster on a GPU than on a single CPU core. In spite of the complex path calculations, up to ~10 speed-up was observed also for 3D models using octree discretisation. GPUs enable calculations of models with hundreds of millions of cells, as encountered in the context of large-scale simulations of interstellar clouds. LOC shows good performance and accuracy and and is able to handle many RT modelling tasks on personal computers. Being written in Python, with the computing-intensive parts implemented as compiled OpenCL kernels, it can also a serve as a platform for further experimentation with alternative RT implementations.
description: accepted for publication in A&A