cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Search for Wprime Boson Decaying to Electron-Neutrino Pairs in pbarp Collisions at sqrt{s}=1.96 TeV
Creators: name: CDF Collaboration
name: Abulencia, A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We present the results of a search for Wprime boson decaying to electron-neutrino pairs in pbarp collisions at a center-of-mass energy of 1.96 TeV, using a data sample corresponding to 205 pb^-1 of integrated luminosity collected by the CDF II detector at Fermilab. We observe no evidence for this decay mode and set limits on the production cross section times branching fraction, assuming the neutrinos from Wprime boson decays to be light. If we assume the manifest left-right symmetric model, we exclude a Wprime boson with mass less than 788 GeV/c^2 at the 95% confidence level.
description: submitted to Physical Review D Rapid Communcation
The role of colour flows in matrix element computations and Monte Carlo simulations
Creators: name: Frixione, Stefano
name: Webber, Bryan R.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We discuss how colour flows can be used to simplify the computation of matrix elements, and in the context of parton shower Monte Carlos with accuracy beyond leading-colour. We show that, by systematically employing them, the results for tree-level matrix elements and their soft limits can be given in a closed form that does not require any colour algebra. The colour flows that we define are a natural generalization of those exploited by existing Monte Carlos; we construct their representations in terms of different but conceptually equivalent quantities, namely colour loops and dipole graphs, and examine how these objects may help to extend the accuracy of Monte Carlos through the inclusion of subleading-colour effects. We show how the results that we obtain can be used, with trivial modifications, in the context of QCD+QED simulations, since we are able to put the gluon and photon soft-radiation patterns on the same footing. We also comment on some peculiar properties of gluon-only colour flows, and their relationships with established results in the mathematics of permutations.
description: 75 pages, 3 figures; a few amendments to the text, and some references added
Defects-driven appearance of half-metallic ferrimagnetism in Co-Mn--based Heusler alloys
Creators: name: Ozdogan, K.
name: Galanakis, I.
name: Sasioglu, E.
name: Aktas, B.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Half-metallic ferromagnetic full-Heusler alloys containing Co and Mn, having the formula Co$_2$MnZ where Z a sp element, are among the most studied Heusler alloys due to their stable ferromagnetism and the high Curie temperatures which they present. Using state-of-the-art electronic structure calculations we show that when Mn atoms migrate to sites occupied in the perfect alloys by Co, these Mn atoms have spin moments antiparallel to the other transition metal atoms. The ferrimagnetic compounds, which result from this procedure, keep the half-metallic character of the parent compounds and the large exchange-splitting of the Mn impurities atoms only marginally affects the width of the gap in the minority-spin band. The case of [Co$_{1-x}$Mn$_x$]$_2$MnSi is of particular interest since Mn$_3$Si is known to crystallize in the Heusler $L2_1$ lattice structure of Co$_2$MnZ compounds. Robust half-metallic ferrimagnets are highly desirable for realistic applications since they lead to smaller energy losses due to the lower external magnetic fields created with respect to their ferromagnetic counterparts.
Search for Lorentz Invariance Violation from stacked Gamma-Ray Burst spectral lag data
Creators: name: Agrawal, Rajdeep
name: Singirikonda, Haveesh
name: Desai, Shantanu
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: A number of works have claimed detections of a turn-over in the spectral lag data for individual Gamma-Ray Bursts (GRBs), caused by an energy-dependent speed of light, which could be a possible manifestation of Lorentz invariance violation (LIV). Here, we stack the spectral lag data from a total of 37 GRBs (with a total of 91 measurements), to verify if the combined data is consistent with a unified model consisting of intrinsic astrophysical emission, along with another contribution due to LIV. We then carry out Bayesian model comparison to ascertain if this combined spectral lag data shows a preference for an energy-dependent speed of light, as compared to only an intrinsic astrophysical emission mechanism. We do not find a decisive evidence for such an energy-dependent speed of light for two different models of LIV. When we assume a constant intrinsic lag coupled with an unknown intrinsic scatter, we do not find any evidence for LIV. However, when we use GRB-dependent parameters to model the intrinsic emission, we get decisive evidence for LIV violation. We then carry out a search for LIV Standard Model Extension using this dataset as well as an independent search using a separate dataset consisting of rest-frame spectral lags. Finally, none of the models considered here with any of the aforementioned assumptions provide a good fit to the stacked spectral lag data, indicating that there is still missing Physics in the model for intrinsic spectral lags.
description: 27 pages, 8 figures. Accepted for publication in JCAP
Cylindrically asymmetric hydrodynamic equations
Creators: name: Chojnacki, Mikolaj
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We show that the boost-invariant and cylindrically asymmetric hydrodynamic equations for baryon-free matter may be rewritten as only two coupled partial differential equations. In the case where the system exhibits the cross-over phase transition, the standard numerical methods may be applied to solve these equations. An example of our results describing non-central gold on gold collisions at RHIC energies is presented.
description: 8 pages, 3 figures, Talk presented at the Cracow School of Theoretical Physics, XLVI Course, 2006
Practitioner agreement on problem identification in consultation
Creators: name: Brix, Patricia A.
Publisher: name: University of British Columbia
Year: 2009

description: This was a descriptive study of the agreements reached by learning assistants and classroom teachers when identifying a student's problem(s) during a consultative problem identification interview. The behavioral consultation research literature suggested that problem identification was a critical component of the problem solving process (Bergan & Tombari, 1976) however, the reliability of information gathered during the consultation interviews required further investigation (White & Edelstein, 1991). This study addressed the issue of reliability of the problem identification interview in consultation by examining interrater and interparticipant agreements as to the priority, nature and number of problems identified during the interview. Nine learning assistance teachers conducted problem identification interviews with each of four classroom teachers from their individual schools regarding students who the teacher identified as difficult to teach. Participants rated their problem identification interviews with an evaluative rating scale of interview helpfulness, and levels of problem identification and shared understanding in their interview dyad. Post consultation interviews with each participant revealed the levels to which each identified the presenting problems i n priority by nature and number. Results reported the level to which each interview dyad (N=36) agreed upon the problem(s) identified. Two raters gave independent ratings to the level of shared understanding of the problem(s) identified by the participants as well as to the priority, number and nature of the problem(s). Participant-rater agreements were determined for the same variables. The results reported a moderate level of agreement (Kappa=.66) between the participants as to the nature of the highest priority problem. A moderate level of agreement was determined between Rater 2 and the learning assistance teachers (K=.67) and the classroom teachers (K=.78) regarding the nature of the highest priority problem as well. The implication of these findings suggested that the dynamic process of problem identification is reliable. However, the process may result in lack of complete agreement between participants until the process results in problem descriptions which are specific enough to allow problem solution to be attempted. A replication of this study is needed to further validate these results. Further research is warranted in order to confirm the level at which problem identification is completed.
$η/s$ and Phase Transitions
Creators: name: Dobado, Antonio
name: Llanes-Estrada, Felipe J.
name: Torres-Rincon, Juan M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present a calculation of eta/s for the meson gas (zero baryon number), with the viscosity computed within unitarized NLO chiral perturbation theory, and confirm the observation that eta/s decreases towards the possible phase transition to a quark-gluon plasma/liquid. The value is somewhat higher than previously estimated in LO chi PT. We also examine the case of atomic Argon gas to check the discontinuity of eta/s across a first order phase transition. Our results suggest employing this dimensionless number, sometimes called KSS number (in analogy with other ratios in fluid mechanics such as Reynolds number or Prandtl number) to pin down the phase transition and critical end point to a cross-over in strongly interacting nuclear matter between the hadron gas and quark and gluon plasma/liquid.
description: Revised for PRD. Shorter (by one section) than first version. 6 pp, 4 figures
RXTE observations of the Low/Hard State X-ray Outburst of the new x-ray transient SWIFT J1753.5-0127
Creators: name: Ramadevi, M. C.
name: Seetha, S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the results of the analysis of RXTE (Rossi X-ray Timing Explorer) observations of the new x-ray transient, SWIFT J1753.5-0127 during its outburst in July, 2005. The source was caught at the peak of the burst with a flux of 7.19e-09 ergs-s$^{-1}$-cm$^{-2}$ in the 3-25 keV energy range and observed until it decreased by about a factor of 10. The photon index of the power law component, which is dominant during the entire outburst, decreases from $\sim$1.76 to 1.6. However, towards the end of the observations the photon index is found to increase, indicating a softening of the spectra. The presence of an ultrasoft thermal component, during the bright phases of the burst, is clear from the fits to the data. The temperature associated with this thermal component is 0.4 keV. We believe that this thermal component could be due to the presence of an accretion disk. Assuming a distance of 8.5 kpc, $L_{X}/L_{Edd} \simeq 0.05$ at the peak of the burst, for a black hole of mass $10 {\rm M}_{\odot}$. The source is found to be locked in the low/hard state during the entire outburst and likely falls in the category of the x-ray transients that are observed in the low/hard state throughout the outburst. We discuss the physical scenario of the low/hard state outburst for this source.
description: Accepted for publication in MNRAS; some sections are added as per referee's suggestions; 7 figures and 8 pages
title: Data storage standards for the atmospheric sciences
Creators: name: Hooper, DA
Publisher: name: Science and Technology Facilities Council
Year: 2010

description: In order to ensure the long-term usefulness of scientific data, it is essential that they are recorded using a commonly readable file format, which should ideally be self-describing. Even more importantly the files should include appropriate items of metadata, i.e. information about the data. This document will focus on the use of the Climate and Forecast (CF) metadata conventions, which have been designed for use together with the netCDF file format. They are designed to capture details which are often common-knowledge within the research groups who operate instruments but which might not be documented elsewhere. Consequently they are equally as important for current data usage, particularly where files are exchanged between different research groups, as they are for ensuring the long-term usefulness. This document was originally written to accompany a lecture given by the author at the Radar School, held 12th-16th May 2009, which preceded the 12th International Workshop on Technical and Scientific Aspects of MST Radar (MST12), held 17th-23rd May 2009 in London, Ontario (Canada).
Jet-cloud collisions in the jet of the Seyfert galaxy NGC3079
Creators: name: Middelberg, Enno
name: Agudo, Ivan
name: Roy, Alan L.
name: Krichbaum, Thomas P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report the results from a six-year, multi-epoch very long baseline interferomertry monitoring of the Seyfert galaxy NGC3079. We have observed NGC3079 during eight epochs between 1999 and 2005 predominantly at 5GHz, but covering the frequency range of 1.7GHz to 22GHz. Using our data and observations going back to 1985, we find that the separation of two of the three visible nuclear radio components underwent two decelerations. At the time of these decelerations, the flux density of one of the components increased by factors of five and two, respectively. We interpret these events as a radio jet component undergoing compression, possibly as a result of a collision with ISM material. This interpretation strongly supports the existence of jets surrounded by a clumpy medium of dense clouds within the first few parsecs from the central engine in NGC3079. Moreover, based on recently published simulations of jet interactions with clumpy media, this scenario is able to explain the nature of two additional regions of ageing synchrotron material detected at the lower frequencies as by-products of such interactions, and also the origin of the kpc-scale super bubble observed in NGC3079 as the result of the spread of the momentum of the jets impeded from propagating freely. The generalization of this scenario provides an explanation why jets in Seyfert galaxies are not able to propagate to scales of kpc as do jets in radio-loud AGN.
description: 11 pages, 9 figures, needs aas_macros.sty and mn2e.cls
Lepton number violation via intermediate black hole processes
Creators: name: Doukas, Jason
name: Choudhury, S. Rai
name: Joshi, G. C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Black holes at the TeV scale are investigated in the extra large dimension scenario. We interpret the lightest black hole excitation as a singlet scalar field, and show how interaction terms can be appended to the standard model at the dimension five non-renormalizable level. Lepton family number violation is natural in this model. Muon magnetic moment, and neutrino masses are investigated. We also present a quantization scheme in n dimensions.
description: 5 pages, 4 figures
Renormalization-Group flow for the field strength in scalar self-interacting theories
Creators: name: Consoli, M.
name: Zappalá, D.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We consider the Renormalization-Group coupled equations for the effective potential V(ϕ) and the field strength Z(ϕ) in the spontaneously broken phase as a function of the infrared cutoff momentum k. In the k \to 0 limit, the numerical solution of the coupled equations, while consistent with the expected convexity property of V(ϕ), indicates a sharp peaking of Z(ϕ) close to the end points of the flatness region that define the physical realization of the broken phase. This might represent further evidence in favor of the non-trivial vacuum field renormalization effect already discovered with variational methods.
description: 10 pages, 3 Figures, version accepted for publication in Phys. Lett. B
Extremal $G$-invariant eigenvalues of the Laplacian of $G$-invariant metrics
Creators: name: Colbois, Bruno
name: Dryden, Emily B.
name: Soufi, Ahmad El
Publisher: name: arXiv
Year: 2007
Subjects: subject: Differential Geometry (math.DG)
subject: Spectral Theory (math.SP)
subject: FOS: Mathematics
subject: 58J50, 58E11, 35P15

description: The study of extremal properties of the spectrum often involves restricting the metrics under consideration. Motivated by the work of Abreu and Freitas in the case of the sphere $S^2$ endowed with $S^1$-invariant metrics, we consider the subsequence $λ_k^G$ of the spectrum of a Riemannian manifold $M$ which corresponds to metrics and functions invariant under the action of a compact Lie group $G$. If $G$ has dimension at least 1, we show that the functional $λ_k^G$ admits no extremal metric under volume-preserving $G$-invariant deformations. If, moreover, $M$ has dimension at least three, then the functional $λ_k^G$ is unbounded when restricted to any conformal class of $G$-invariant metrics of fixed volume. As a special case of this, we can consider the standard O(n)-action on $S^n$; however, if we also require the metric to be induced by an embedding of $S^n$ in $\mathbb{R}^{n+1}$, we get an optimal upper bound on $λ_k^G$.
description: To appear in Mathematische Zeitschrift
Fluctuations of a driven membrane in an electrolyte
Creators: name: Lacoste, D.
name: Lagomarsino, M. Cosentino
name: Joanny, JF.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We develop a model for a driven cell- or artificial membrane in an electrolyte. The system is kept far from equilibrium by the application of a DC electric field or by concentration gradients, which causes ions to flow through specific ion-conducting units (representing pumps, channels or natural pores). We consider the case of planar geometry and Debye-Hückel regime, and obtain the membrane equation of motion within Stokes hydrodynamics. At steady state, the applied field causes an accumulation of charges close to the membrane, which, similarly to the equilibrium case, can be described with renormalized membrane tension and bending modulus. However, as opposed to the equilibrium situation, we find new terms in the membrane equation of motion, which arise specifically in the out-of-equilibrium case. We show that these terms lead in certain conditions to instabilities.
description: 7 pages, 2 figures. submitted to Europhys. Lett
Virial theorems for trapped cold atoms
Creators: name: Werner, Félix
Publisher: name: arXiv
Year: 2008
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We present a general virial theorem for quantum particles with arbitrary zero-range or finite-range interactions in an arbitrary external potential. We deduce virial theorems for several situations relevant to trapped cold atoms: zero-range interactions with and without Efimov effect, hard spheres, narrow Feshbach resonances, and finite-range interactions. If the scattering length $a$ is varied adiabatically in the BEC-BCS crossover, we find that the trapping potential energy as a function of $1/a$ has an inflexion point at unitarity.
description: A few small corrections
Statistics of X-ray observables for the cooling-core and non-cooling core galaxy clusters
Creators: name: Chen, Y.
name: Reiprich, T. H.
name: Böhringer, H.
name: Ikebe, Y.
name: Zhang, Y. -Y.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a statistical study of the occurrence and effects of the cooling cores in the clusters of galaxies in a flux-limited sample, HIFLUGCS, based on ROSAT and ASCA observations. About 49% of the clusters in this sample have a significant, classically-calculated cooling-flow, mass-deposition rate. The upper envelope of the derived mass-deposition rate is roughly proportional to the cluster mass, and the fraction of cooling core clusters is found to decrease with it. The cooling core clusters are found to have smaller core radii than non-cooling core clusters, while some non-cooling core clusters have high $β$ values (> 0.8). In the relation of the X-ray luminosity vs. the temperature and the mass, the cooling core clusters show a significantly higher normalization. A systematic correlation analysis, also involving relations of the gas mass and the total infrared luminosity, indicates that this bias is shown to be mostly due to an enhanced X-ray luminosity for cooling core clusters, while the other parameters, like temperature, mass, and gas mass may be less affected by the occurrence of a cooling core. These results may be explained by at least some of the non-cooling core clusters being in dynamically young states compared with cooling core clusters, and they may turn into cooling core clusters in a later evolutionary stage.
description: A&A accepted
Necessary and sufficient condition for hydrostatic equilibrium in general relativity
Creators: name: Negi, P. S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present explicit examples to show that the `compatibility criterion' is capable of providing a {\em necessary} and {\em sufficient} condition for any regular configuration to be compatible with the state of hydrostatic equilibrium. This conclusion is drawn on the basis of the finding that the $M-R$ relation gives the necessary and sufficient condition for dynamical stability of equilibrium configurations only when the compatibility criterion for these configurations is appropriately satisfied. In this regard, we construct an appropriate sequence composed of core-envelope models on the basis of compatibility criterion, such that each member of this sequence satisfies the extreme case of causality condition $v = c = 1$ at the centre. The maximum stable value of $u \simeq 0.3389$ (which occurs for the model corresponding to the maximum value of mass in the mass-radius relation) and the corresponding central value of the local adiabatic index, $(Γ_1)_0 \simeq 2.5911$, of this model are found fully consistent with those of the corresponding {\em absolute} values, $u_{\rm max} \leq 0.3406$, and $(Γ_1)_0 \leq 2.5946$, which impose strong constraints on these parameters of such models. In addition to this example, we also study dynamical stability of pure adiabatic polytropic configurations on the basis of variational method for the choice of the `trial function', $ξ=re^{ν/4}$, as well as the mass-central density relation, since the compatibility criterion is appropriately satisfied for these models. The results of this example provide additional proof in favour of the statement regarding compatibility criterion mentioned above.
description: 31 pages (double-spaced) revtex style, 1 figure in `ps' format
Magnonic band structure in CoFeB/Ta/NiFe meander-shaped magnetic bilayers
Creators: name: Gubbiotti, G.
name: Sadovnikov, A.
name: Beginin, E.
name: Sheshukova, S.
name: Nikitov, S.
name: Talmelli, G.
name: Asselberghs, I.
name: Radu, I. P.
name: Adelmann, C.
name: Ciubotaru, F.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: In this work, we investigate the spin-wave propagation in three-dimensional nanoscale CoFeB/Ta/NiFe meander structures fabricated on a structured SiO2/Si substrate. The magnonic band structure has been experimentally determined by wavevector-resolved Brillouin light scattering (BLS) spectroscopy and a set of stationary modes interposed by two dispersive modes of Bloch type have been identified. The results could be understood by micromagnetic and finite element simulations of the mode distributions in both real space and the frequency domain. The dispersive modes periodically oscillate in frequency over the Brillouin zones and correspond to modes, whose spatial distributions extend over the entire sample and are either localized exclusively in the CoFeB layer or the entire CoFeB/Ta/NiFe magnetic bilayer. Stationary modes are mainly concentrated in the vertical segments of the CoFeB and NiFe layers and show negligible amplitudes in the horizon-tal segments. The findings are compared with those of single-layer CoFeB meander structures with the same geometry parameters, which reveals the influence of the dipolar coupling between the two ferromagnetic layers on the magnonic band structure.
description: 10 pages, 4 figures. This project has received funding from the European Union's Horizon 2020 research and innovation program under grant agreement No. 801055 "Spin Wave Computing for Ultimately-Scaled Hybrid Low-Power Electronics" - CHIRON
Bragg spectroscopy of a cigar shaped Bose condensate in optical lattices
Creators: name: Ghosh, Tarun Kanti
name: Machida, Kazushige
Publisher: name: arXiv
Year: 2006
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We study properties of excited states of an array of weakly coupled quasi-two-dimensional Bose condensates by using the hydrodynamic theory. We calculate multibranch Bogoliubov-Bloch spectrums and its corresponding eigenfunctions. The spectrum of the axial excited states and its eigenfunctions strongly depends on the coupling among various discrete radial modes within a given symmetry. This mode coupling is due to the presence of radial trapping potential. The multibranch nature of the Bogoliubov-Bloch spectrum and its dependence on the mode-coupling can be realized by analyzing dynamic structure factor and momentum transferred to the system in Bragg spectroscopy experiments. We also study dynamic structure factor and momentum transferred to the condensate due to the Bragg spectroscopy experiment.
description: 7 pages, 5 figures, to appear in Journal of Physics B: Atomic, Molecular & Optical Physics
Reduction of Trapping and Recombination in Upgraded Metallurgical Grade Silicon: Impact of Phosphorous Diffusion Gettering
Creators: name: Dasilva-Villanueva, N.
name: Catalán-Gómez, S.
name: Marrón, D. Fuertes
name: Torres, J. J.
name: García-Corpas, M.
name: del Cañizo, C.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Applied Physics (physics.app-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Upgraded metallurgical grade (UMG) silicon (Si) has raised interest as an alternative material for solar cells due to its low cost, low environmental impact and low CAPEX. Maximum cell efficiencies at the level of those obtained from high purity poly-Si have been reported. However, a higher defect density and the compensated doping character result in UMG-based cell efficiencies varying over wider ranges in frequency distribution charts. In this report we characterize mc-Si UMG samples with different defect densities, comparing them with mono-Si UMG and commercial high-performance mc-Si samples, analysing the impact of carrier trapping by means of photoconductance (PC) decay measurements, and its evolution after applying a phosphorous diffusion gettering (PDG) process. When analyzing the decay time constant of the PC measurements, slow (66.8+-14.3 ms) and fast (16.1+-3.5 ms) traps are found in mc-Si samples, while no evidence of trapping is found in mono-UMG samples. Slow traps are effectively removed after the PDG process, while fast traps do remain. The influence of dislocations clusters and the possible role of oxygen, as revealed by Fourier-transform infrared spectroscopy (FTIR) is discussed. Finally, the improvement in minority carrier lifetime due to the PDG treatment is reported for each sample type, reaching values up to 140 us in mc-Si samples with no slow traps neither interstitial oxygen FTIR-peaks
description: 18 pages, 6 figures
EC Open Research Europe Appendices 'Baltic catacombs.' Translating corpisanti catacomb relic-sculptures between Rome, Polish Livonia, and the Lithuanian Grand Duchy circa 1750-1800.
Creators: name: Noyes, Ruth Sargent
Publisher: name: Zenodo
Year: 2021
Subjects: relics
history of art
Baltic history

description: Extended data (Appendices) for ‘Baltic catacombs.’ Translating corpisanti catacomb relic-sculptures between Rome, Polish Livonia, and the Lithuanian Grand Duchy circa 1750-1800. Open Research Europe 1 (2021) Ruth Sargent Noyes, Dzmitry Marozau, Dzianis Filipchyk et al. Transcription and translation of primary source materials.
Effectiveness of lidocaine pretreatment to pain following propofol injection : A randomized, double-blind study
Creators: name: Jeeraluck Limim, Patchanee Pasitchakrit
Publisher: name: Faculty of Medicine,Srinakharinwirot University
Year: 2008
Subjects: lidocaine, pain on injection, pretreatment, propofol

description: 3, 14, Journal of Medicine and Health Sciences
Fluctuation effects in the theory of microphase separation of diblock copolymers in the presence of an electric field
Creators: name: Gunkel, I.
name: Stepanow, S.
name: Thurn-Albrecht, T.
name: Trimper, S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We generalize the Fredrickson-Helfand theory of the microphase separation in symmetric diblock copolymer melts by taking into account the influence of a time-independent homogeneous electric field on the composition fluctuations within the self-consistent Hartree approximation. We predict that electric fields suppress composition fluctuations, and consequently weaken the first-order transition. In the presence of an electric field the critical temperature of the order-disorder transition is shifted towards its mean-field value. The collective structure factor in the disordered phase becomes anisotropic in the presence of the electric field. Fluctuational modulations of the order parameter along the field direction are strongest suppressed. The latter is in accordance with the parallel orientation of the lamellae in the ordered state.
description: 16 pages
Singular Continuous Spectrum for the Laplacian on Certain Sparse Trees
Creators: name: Breuer, Jonathan
Publisher: name: arXiv
Year: 2006
Subjects: subject: Spectral Theory (math.SP)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We present examples of rooted tree graphs for which the Laplacian has singular continuous spectral measures. For some of these examples we further establish fractional Hausdorff dimensions. The singular continuous components, in these models, have an interesting multiplicity structure. The results are obtained via a decomposition of the Laplacian into a direct sum of Jacobi matrices.
Tetraquarks in large-$N_c$ QCD
Creators: name: Lucha, Wolfgang
name: Melikhov, Dmitri
name: Sazdjian, Hagop
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The present work reviews the various aspects of the extension of the large-$N_c$ approach, as had been proposed and developed by 't Hooft, to the case of tetraquark states, which are a category of the general class of exotic states, also called multiquark states, whose internal valence-quark structure does not match with that of ordinary hadrons, and which have received, in recent years, many experimental confirmations. The primary question of describing, or probing, on theoretical grounds, multiquark states is first examined. The signature of such states inside Feynman diagrams in relation with their singularities is highlighted. The main mechanisms of formation of tetraquark states, provided by the diquark model and the molecular scheme, are considered together with their specific implications. The properties of tetraquark states at large $N_c$ are analyzed through the Feynman diagrams that describe two-meson scattering amplitudes. It turns out that, in that limit, the possible formation of tetraquark states is mainly due to the mutual interactions of their internal mesonic clusters. These essentially arise from the quark-rearrangement, or quark-interchange, mechanism. In coupled-channel meson-meson scattering amplitudes, one may expect the occurrence of two independent tetraquark states, each having priviledged couplings with the two mesons of their dominant channel. The question of the energy balance of various schemes in the static limit is also analyzed. The clarification of the mechanisms that are at work in the formation of tetraquarks is the main outcome from the large-$N_c$ approach to this problem.
description: 132 pages, 53 figures. Review article. v2: Sections 2.7 and 5.4 have been slightly extended; a few clarifying comments have been added in other sections; figure 43 has been completed; references have been added
$P_{c}(4457) \to P_{c}(4312) π/γ$ in the molecular picture
Creators: name: Ling, Xi-Zhe
name: Lu, Jun-Xu
name: Liu, Ming-Zhu
name: Geng, Li-Sheng
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The three pentaquark states, $P_{c}(4312)$, $P_{c}(4440)$, and $P_{c}(4457)$, discovered by the LHCb Collaboration in 2019, can be nicely arranged into a multiplet of $\bar{D}^{(\ast)}Σ_{c}^{(\ast)}$ of seven molecules dictated by heavy quark spin symmetry. In this work we employ the effective Lagrangian approach to investigate the two decay modes of $P_{c}(4457)$, $P_{c}(4457) \to P_{c}(4312) π$ and $P_{c}(4457) \to P_{c}(4312) γ$, via the triangle mechanism, assuming that $P_{c}(4457)$ and $P_{c}(4312)$ are $\bar{D}^{\ast}Σ_{c}$ and $\bar{D}Σ_{c}$ bound states but the spin of $P_{c}(4457)$ can be either 1/2 or 3/2. Our results show that the spin of $P_{c}(4457)$ can not be discriminated through these two decay modes. The decay widths of $P_{c}(4457) \to P_{c}(4312) π$ and $P_{c}(4457) \to P_{c}(4312) γ$ are estimated to be of order of 100 keV and 1 keV, respectively. The ratio of the partial decay widths of $P_{c}(4457) \to P_{c}(4312) π$ to $P_{c}(4457) \to P_{c}(4312) γ$ is similar to the ratio of $D^{\ast}\to Dπ$ to $D^{\ast}\to Dγ$, which could be used to check the molecular nature of $P_{c}(4457)$ and $P_{c}(4312)$ if they can be observed in the future.
Toric Legendrian subvarieties
Creators: name: Buczynski, Jaroslaw
Publisher: name: arXiv
Year: 2006
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14M99, 14M25, 14L30

description: We give the full classification of smooth toric Legendrian subvarieties in projective space. We also prove that under some minor assumptions the group of linear automorphisms preserving given Legendrian subvariety preserves the contact structure of the ambient projective space.
description: 19 pages, 5 figures
title: Monitoring scientific computing infrastructure using Nagios
Creators: name: Miah, W
Publisher: name: Science and Technology Facilities Council
Year: 2010

description: This document will describe the Nagios configuration and use by the Scientific Computing Technology (SCT) group at the eScience department of STFC. The Nagios monitoring system has been extensively utilised for the purpose of increasing quality of service of the many services provided by the group. Clients of our services include software developers to scientists across Europe, so it is imperative that the high level of service that our clients expect is provided, and this is provided by a highly scalable, configurable and powerful monitoring system such as Nagios. The Nagios monitoring system is so widespread such that , in addition to standard host/service monitoring, grid monitoring tools such as NCG(Nagios Configuration Generator) are being developed and used and are phasing out existing monitoring such as Inca[3]. The fact that Nagios is an open source project makes it an even more attractive solution as users can modify the code to suit their needs and an example of this will be given. Due to the extensive use within academia and the open source community, knowledge of its use is widespread and support readily available on the World Wide Web. At SCT, Nagios version 3.0.6 runs on RHEL 4.8 with Apache as the web server. This configuration works well, and is reported to run on many flavours of Linux [2]. This report will outline the experience and usage of Nagios within SCT and does not give an exhaustive overview of the technology; if readers require this, they are refered to [1].
High $H_0$ Values from CMB E-mode Data: A Clue for Resolving the Hubble Tension?
Creators: name: Addison, Graeme E.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The E-mode (EE) CMB power spectra measured by Planck, ACTPol, and SPTpol constrain the Hubble constant to be $70.0\pm2.7$, $72.4^{+3.9}_{-4.8}$, and $73.1^{+3.3}_{-3.9}$ km s$^{-1}$ Mpc$^{-1}$ within the standard $Λ$CDM model (posterior mean and central 68% interval bounds). These values are higher than the constraints from the Planck temperature (TT) power spectrum, and consistent with the Cepheid-supernova distance ladder measurement $H_0=73.2\pm1.3$ km s$^{-1}$ Mpc$^{-1}$. If this preference for a higher value was strengthened in a joint analysis it could provide an intriguing hint at the resolution of the Hubble disagreement. We show, however, that combining the Planck, ACTPol, and SPTpol EE likelihoods yields $H_0=68.7\pm1.3$ km s$^{-1}$ Mpc$^{-1}$, $2.4σ$ lower than the distance ladder measurement. This is due to different degeneracy directions across the full parameter space, particularly involving the baryon density, $Ω_bh^2$, and scalar tilt, $n_s$, arising from sensitivity to different multipole ranges. We show that the E-mode $Λ$CDM constraints are consistent across the different experiments within $1.4σ$, and with the Planck TT results at $0.8σ$. Combining the Planck, ACTPol, and SPTpol EE data constrains the phenomenological lensing amplitude, $A_L=0.89\pm0.10$, consistent with the expected value of unity.
description: 9 pages, 1 figure, updated to match version accepted by ApJL
Will the recently approved LARES mission be able to measure the Lense-Thirring effect at 1%?
Creators: name: Iorio, Lorenzo
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: Geophysics (physics.geo-ph)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: After the approval by the Italian Space Agency of the LARES satellite, which should be launched at the end of 2009 with a VEGA rocket and whose claimed goal is a about 1% measurement of the general relativistic gravitomagnetic Lense-Thirring effect in the gravitational field of the spinning Earth, it is of the utmost importance to reliably assess the total realistic accuracy that can be reached by such a mission. The observable is a linear combination of the nodes of the existing LAGEOS and LAGEOS II satellites and of LARES able to cancel out the impact of the first two even zonal harmonic coefficients of the multipolar expansion of the classical part of the terrestrial gravitational potential representing a major source of systematic error. While LAGEOS and LAGEOS II fly at altitudes of about 6000 km, LARES will be placed at an altitude of 1450 km. Thus, it will be sensitive to much more even zonals than LAGEOS and LAGEOS II. Their corrupting impact δμhas been evaluated by using the standard Kaula's approach up to degree L=70 along with the sigmas of the covariance matrices of eight different global gravity solutions (EIGEN-GRACE02S, EIGEN-CG03C, GGM02S, GGM03S, JEM01-RL03B, ITG-Grace02s, ITG-Grace03, EGM2008) obtained by five institutions (GFZ, CSR, JPL, IGG, NGA) with different techniques from long data sets of the dedicated GRACE mission. It turns out δμabout 100-1000% of the Lense-Thirring effect. An improvement of 2-3 orders of magnitude in the determination of the high degree even zonals would be required to constrain the bias to about 1-10%.
description: Latex, 15 pages, 1 table, no figures. Final version matching the published one in General Relativity and Gravitation (GRG)
Σύγκριση των Σχημάτων Αναπαραγωγής του Marx με τις Παραδοσιακές Θεωρίες Μεγέθυνσης
Creators: name: Χατζαράκης, Νικόλαος Θεολόγου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Οικονομική μεγέθυνση
Σχήματα αναπαραγωγής
Υπόδειγμα Harrod-Domar
Υπόδειγμα Solow-Swan
Πτωτική τάση του ποσοστού του κέρδους
Πρόβλημα του Harrod
Εφεδρικός στρατός εργασίας
Economic growth
Reproduction schemes
Harrod-Domar model
Solow-Swan model
Tendency of the rate of profit to fall
Harrod’s knife-edge
Reserve army of labour

description: Η εργασία αυτή αφορά τη σύγκριση των δύο παραδοσιακών θεωριών μεγέθυνσης, του υποδείγματος των Harrod και Domar από τη μια και του υποδείγματος των Solow και Swan από την άλλη, με την κλασσική σκέψη σχετικά με την οικονομική μεγέθυνση, και ιδιαίτερα με τη θεωρία μεγέθυνσης και τα σχήματα διευρυμένης αναπαραγωγής του Marx. Στην πορεία της εργασίας, αναπτύσσονται οι τρεις διαφορετικές προσεγγίσεις, ενώ στην περίπτωση του υποδείγματος των Harrod και Domar όπως και του υποδείγματος των Solow και Swan γίνεται εκτεταμένη σύγκριση με μία μαθηματική αποτύπωση της θεωρίας του Marx. Επίσης, γίνεται αναφορά σε ποίκιλα ζητήματα της οικονομικής μεγέθυνσης, όπως η ανεργία, οι κυκλικές διακυμάνσεις, η πτωτική τάση του ποσοστού του κέρδους, τα οποία θίγονται στο έργο του Marx, δεν προβλέπονται όμως ρητά από τα υποδείγματα των Harrod-Domar και Solow-Swan. Στόχος μας είναι να δείξουμε ότι η προσέγγιση των κλασσικών και του Marx –καθώς και οι σύγχρονες εκδηλώσεις αυτών– δε συνιστούν απλά ένα πλήρες θεωρητικό σύνολο για την πραγμάτευση των ζητημάτων της οικονομικής μεγέθυνσης, αλλά και ένα σύστημα που θέτει και επιλύει τα ζητήματα αυτά πολύ νωρίτερα από τη νεοκλασική και την κεϋνσιανή παράδοση της οικονομικής σκέψης.
description: The present work concerns the comparison of the two main growth theories, resumed in the model of Harrod and Domar on the one hand and in the model of Solow and Swan on the other, with the Classical thought about economic growth, and especially the Marx’s theory of growth and the reproduction schemes. During its course, the three different approaches are developed, while in the case of the Harrod-Domar model as well as the Solow-Swan model, an extended comparison with a mathematical illustration of Marx’s theory is stretched out. Furthermore, several matters of economic growth and development are discussed, such as unemployment, cyclical fluctuations, the tendency of the rate of profit to fall, that are stated in Marx’s work, they are not explicitly mentioned in Harrod-Domar and Solow-Swan models. Our particular purpose is to display the theoretical completeness of the Classics’ and Marx’s approach –as well as their modern interpretations– concerning a great number of economic growth issues, and their posing and treatment of these issues much earlier that both the Neoclassical and the Keynesian tradition in economic thought.
Algebraic Surfaces of General Type with Small c_1^2 in Positive Characteristic
Creators: name: Liedtke, Christian
Publisher: name: arXiv
Year: 2007
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14J29; 14J10

description: We establish Noether's inequality for surfaces of general type in positive characteristic.Then we extend Enriques' and Horikawa's classification of surfaces on the Noether line, the so-called Horikawa surfaces. We construct examples for all possible numerical invariants and in arbitrary characteristic, where we need foliations and deformation techniques to handle characteristic 2. Finally, we show that Horikawa surfaces lift to characteristic zero.
description: 15 pages, minor corrections
Breaking universality in random sequential adsorption on a square lattice with long-range correlated defects
Creators: name: Kundu, Sumanta
name: Mandal, Dipanjan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Jamming and percolation transitions in the standard random sequential adsorption of particles on regular lattices are characterized by a universal set of critical exponents. The universality class is preserved even in the presence of randomly distributed defective sites that are forbidden for particle deposition. However, using large-scale Monte Carlo simulations by depositing dimers on the square lattice and employing finite-size scaling, we provide evidence that the system does not exhibit such well-known universal features when the defects have spatial long-range (power-law) correlations. The critical exponents $ν_j$ and $ν$ associated with the jamming and percolation transitions, respectively, are found to be non-universal for strong spatial correlations and approach systematically their own universal values as the correlation strength is decreased. More crucially, we have found a difference in the values of the percolation correlation length exponent $ν$ for a small but finite density of defects with strong spatial correlations. Furthermore, for a fixed defect density, it is found that the percolation threshold of the system, at which the largest cluster of absorbed dimers first establishes the global connectivity, gets reduced with increasing the strength of the spatial correlation.
New graphical criterion for the selection of complete sets of polarization observables and its application to single-meson photoproduction as well as electroproduction
Creators: name: Wunderlich, Y.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: This paper combines the graph-theoretical ideas behind Moravcsik's theorem with a completely analytic derivation of discrete phase-ambiguities, recently published by Nakayama. The result is a new graphical procedure for the derivation of certain types of complete sets of observables for an amplitude-extraction problem with $N$ helicity-amplitudes. The procedure is applied to pseudoscalar meson photoproduction ($N = 4$ amplitudes) and electroproduction ($N = 6$ amplitudes), yielding complete sets with minimal length of $2N$ observables. For the case of electroproduction, this is the first time an extensive list of minimal complete sets is published. Furthermore, the generalization of the proposed procedure to processes with a larger number of amplitudes, i.e. $N > 6$ amplitudes, is sketched. The generalized procedure is outlined for the next more complicated example of two-meson photoproduction ($N = 8$ amplitudes).
description: 31 pages, 14 figures, 4 tables; Version 4 has been accepted for publication in Phys. Rev. C