cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Semi-automated BSM model building procedures in MARTY-1.1 through a 2HDM example
Creators: name: Uhlrich, G.
name: Mahmoudi, F.
name: Arbey, A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: MARTY is a C++ computer algebra system specialized for High Energy Physics that can calculate amplitudes, squared amplitudes and Wilson coefficients in a large variety of beyond the Standard Model scenarios up to the one-loop order. It is fully independent of any other framework and its main development guideline is generality, in order to be adapted easily to any type of model. The calculations are fully automated from the Lagrangian up to the generation of the C++ code evaluating the theoretical results (numerically, depending on the model parameters). Once a phenomenological tool chain has been set up - from a Lagrangian to observable analysis - it can be used in a model independent way leaving only model building, with MARTY, as the task to be performed by physicists. Here we present the main steps to build a general new physics model, namely gauge group, particle content, representations, replacements, rotations and symmetry breaking, using the example of a 2 Higgs Doublet Model. The sample codes that are shown for this example can be easily generalized to any Beyond the Standard Model scenario written with MARTY.
description: Contribution to the proceedings of "Tools for High Energy Physics and Cosmology" - TOOLS2020, 14 pages, 2 figures
Flavor decomposition of the nucleon unpolarized, helicity and transversity parton distribution functions from lattice QCD simulations
Creators: name: Alexandrou, Constantia
name: Constantinou, Martha
name: Hadjiyiannakou, Kyriakos
name: Jansen, Karl
name: Manigrasso, Floriano
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We present results on the quark unpolarized, helicity and transversity parton distributions functions of the nucleon. We use the quasi-parton distribution approach within the lattice QCD framework and perform the computation using an ensemble of twisted mass fermions with the strange and charm quark masses tuned to approximately their physical values and light quark masses giving pion mass of 260 MeV. We use hierarchical probing to evaluate the disconnected quark loops. We discuss identification of ground state dominance, the Fourier transform procedure and convergence with the momentum boost. We find non-zero results for the disconnected isoscalar and strange quark distributions. The determination of the quark parton distribution and in particular the strange quark contributions that are poorly known provide valuable input to the structure of the nucleon.
description: 32 pages and 16 figures
Pion quark structure in QCD
Creators: name: Bakulev, A. P.
name: Pimikov, A. V.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We describe the present status of the pion distribution amplitude as it originated from two sources: (i) a nonperturbative approach, based on QCD sum rules with nonlocal condensates and (ii) a NLO QCD analysis of the CLEO data on F^{γγ^*π}(Q^2), supplemented by the recent high-precision lattice calculations of the second moment of the pion distribution amplitude.
description: 4 pages, 2 figures, talk at the 9th International Workshop on Meson Production, Properties and Interaction, Krakow, Poland, 9--13 June 2006
In vitro model of periodontal epithelium
Creators: name: Pan, Peter
Publisher: name: University of British Columbia
Year: 2008

description: To develop a model for junctional epithelium, porcine periodontal ligament epithelial cells (PLE cells) were cultured from the epithelial rests of Malassez. The obtained epithelial cell lines were grown on a porous membrane that allows a good cell adhesion and access of the nutrients from both basal and apical directions, and which enhanced the spatial development of the epithelium. The epithelial cells that were cultured for 7 days or longer formed 4 to 6 cell layers that had distinct characteristics of basal cells and stratified surface cells. Generally, one of the most important tools used to characterize the phenotype of epithelium is the analysis of cytokeratins. The expression of keratins by PLE cells in culture was similar to that of junctional epithelium in vivo. In older cultures, though, the cells expressed cornification markers and a cytokeratin pattern similar to that of sulcular epithelium in vivo. The biochemical and ultrastructural characterization of the extracellular matrix of epithelial cultures revealed the presence of a basal lamina that contained laminin but not type IV collagen, similar to the composition of the internal basal lamina (IBL) of junctional epithelium in vivo. Permeability of the epithelium was studied by assaying transepithelial resistance and penetration of different tracer molecules through the epithelium. It was found that the maximum permeability barrier, about 10 times that of the filter without the cells, was obtained when cells were plated at a high density and cultured for about 10 days in alpha-ME supplemented with 15% fetal calf serum. Larger molecules such as dextran 70 diffused more slowly through the epithelium than smaller molecules, e.g. methionine and phenol red. The permeability could be modulated by several means. These included treatment with phorbolmyristate acetate and hyaluronidase, and alteration of serum concentration in the culture medium. My model for junctional epithelium allowed the study of the effects of one possible periodontopathogen, Treponema denticola, on the epithelium. T. dent/cola caused rapid loss of extracellular spaces, vacuolization of cells, sloughing off of part of the surface cells and increased transepithelial permeability. These effects were found to result, at least partly, from effects of T. denticola surface proteins that rapidly diffused into the epithelial cells. The epithelial model was found to mimic reasonably well junctional epithelium. It provides a new means to study the behaviour of junctional epithelium in a controlled, reproducible and relatively easy way.
Reasoning on $\textit{DL-Lite}_{\cal R}$ with Defeasibility in ASP
Creators: name: Bozzato, Loris
name: Eiter, Thomas
name: Serafini, Luciano
Publisher: name: arXiv
Year: 2021
Subjects: subject: Artificial Intelligence (cs.AI)
subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences
subject: I.2.4; F.4.1

description: Reasoning on defeasible knowledge is a topic of interest in the area of description logics, as it is related to the need of representing exceptional instances in knowledge bases. In this direction, in our previous works we presented a framework for representing (contextualized) OWL RL knowledge bases with a notion of justified exceptions on defeasible axioms: reasoning in such framework is realized by a translation into ASP programs. The resulting reasoning process for OWL RL, however, introduces a complex encoding in order to capture reasoning on the negative information needed for reasoning on exceptions. In this paper, we apply the justified exception approach to knowledge bases in $\textit{DL-Lite}_{\cal R}$, i.e., the language underlying OWL QL. We provide a definition for $\textit{DL-Lite}_{\cal R}$ knowledge bases with defeasible axioms and study their semantic and computational properties. In particular, we study the effects of exceptions over unnamed individuals. The limited form of $\textit{DL-Lite}_{\cal R}$ axioms allows us to formulate a simpler ASP encoding, where reasoning on negative information is managed by direct rules. The resulting materialization method gives rise to a complete reasoning procedure for instance checking in $\textit{DL-Lite}_{\cal R}$ with defeasible axioms. Under consideration in Theory and Practice of Logic Programming (TPLP).
description: Under consideration in Theory and Practice of Logic Programming (TPLP). This paper is an extended and revised version of a conference paper appearing in the proceedings of the 3rd International Joint Conference on Rules and Reasoning (RuleML+RR 2019). (v2 updates: added discussion on equivalence in Appendix, typos corrected). arXiv admin note: text overlap with arXiv:1905.09221
Low frequency quasi-normal modes of AdS black holes
Creators: name: Siopsis, George
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We calculate analytically low frequency quasi-normal modes of gravitational perturbations of AdS Schwarzschild black holes in $d$ dimensions. We arrive at analytic expressions which are in agreement with their counterparts from linearized hydrodynamics in $S^{d-2}\times \mathbb{R}$, in accordance with the AdS/CFT correspondence. Our results are also in good agreement with results of numerical calculations.
description: 14 pages
Factors affecting the mortality of winter moth in the lower mainland of British Columbia
Creators: name: Horgan, Finbarr G.
Publisher: name: University of British Columbia
Year: 2008

description: Populations of winter moth, Operophtera brumata (L.), were monitored at four sites in Richmond, British Columbia, between 1989 and 1992. Populations peaked in 1990 on both blueberry and birch and declined with an eventual population crash in 1992.Parasitism by Cyzenis albicans (Fall.) fluctuated between years at each site. Parasitism reached its highest levels on both birch (ca. 55%) and blueberry (ca. 35%) in 1991. Pupa predation was the most important stage specific mortality factor throughout the four years. In 1992, the year of population crash, larval mortality was high. Trends in "death of pupae due to unknown causes" were linked to larval mortality and are suggested to result mainly from poor foliage quality. An unusually early spring in 1992, may have led to the observed increases in these two mortality factors. The incidence of viral or other diseases among the populations are low. Generally, pupal predation peaked in 1990 (ca. 90%) and then declined. Pterostichus spp., Amara spp., Harpalus affinus and subsoil beetle larvae are implicated as important predators. The levels and trends in predation were similar at sites with very different assemblages and abundances of beetles. There were no differences in the abundances of beetles at each site between 1991 and 1992. However, many of the important predatory species declined in 1992. An examination of the possible interactions between C. albi cans and generalist predators is made. The increased range of pupal sizes in the soil, due to the presence of C. albi cans may be a mechanism for inducing a numerical response among generalist predators. However, simultaneous population declines at sites with low levels of C. albicans indicate that winter moth outbreak and decline in North America may be induced by a number of different factors.
Averaging in Spherically Symmetric Cosmology
Creators: name: Coley, A. A.
name: Pelavas, N.
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In the macroscopic gravity approach to the averaging problem in cosmology, the Einstein field equations on cosmological scales are modified by appropriate gravitational correlation terms. We study the averaging problem within the class of spherically symmetric cosmological models. That is, we shall take the microscopic equations and effect the averaging procedure to determine the precise form of the correlation tensor in this case. In particular, by working in volume preserving coordinates, we calculate the form of the correlation tensor under some reasonable assumptions on the form for the inhomogeneous gravitational field and matter distribution. We find that the correlation tensor in a FLRW background must be of the form of a spatial curvature. Inhomogeneities and spatial averaging, through this spatial curvature correction term, can have a very significant dynamical effect on the dynamics of the Universe and cosmological observations; in particular, we discuss whether spatial averaging might lead to a more conservative explanation of the observed acceleration of the Universe (without the introduction of exotic dark matter fields). We also find that the correlation tensor for a non-FLRW background can be interpreted as the sum of a spatial curvature and an anisotropic fluid. This may lead to interesting effects of averaging on astrophysical scales. We also discuss the results of averaging an inhomogeneous Lemaitre-Tolman-Bondi solution as well as calculations of linear perturbations (that is, the back-reaction) in an FLRW background, which support the main conclusions of the analysis.
A Multiwire Proportional Chamber for Precision Studies of Neutron Beta Decay Angular Correlations
Creators: name: Ito, T. M.
name: Carr, R.
name: Filippone, B. W.
name: Martin, J. W.
name: Plaster, B.
name: Rybka, G.
name: Yuan, J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: A new multiwire proportional chamber (MWPC) was designed and constructed for precision studies of neutron beta decay angular correlations. Its design has several novel features, including the use of low pressure neopentane as the MWPC gas and an entrance window made of thin Mylar sheet reinforced with Kevlar fibers. In the initial off-line performance tests, the gas gain of neopentane and the position resolution were studied.
description: 22 pages, 15 figures
General method for including Stueckelberg fields
Creators: name: Lyakhovich, S. L.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: A systematic procedure is proposed for inclusion of Stueckelberg fields. The procedure begins with the involutive closure when the original Lagrangian equations are complemented by all the lower order consequences. The involutive closure can be viewed as Lagrangian analogue of complementing constrained Hamiltonian system with secondary constraints. The involutively closed form of the field equations allows for explicitly covariant degree of freedom number count, which is stable with respect to deformations. If the original Lagrangian equations are not involutive, the involutive closure will be a non-Lagrangian system. The Stueckelberg fields are assigned to all the consequences included into the involutive closure of the Lagrangian system. The iterative procedure is proposed for constructing the gauge invariant action functional involving Stueckelberg fields such that Lagrangian equations are equivalent to the involutive closure of the original theory. The generators of the Stueckelberg gauge symmetry begin with the operators generating the closure of original Lagrangian system. These operators are not assumed to be a generators of gauge symmetry of any part of the original action, nor are they supposed to form an on shell integrable distribution. With the most general closure generators, the consistent Stueckelberg gauge invariant theory is iteratively constructed, without obstructions at any stage. The Batalin-Vilkovisky form of inclusion the Stueckelberg fields is worked out and existence theorem for the Stueckelberg action is proven.
description: 30 pages, minor corrections in the abstract
Washington Post-Schar School Poll: Virginia October 2017
Creators: name: Policy, Schar School Of
name: Washington Post
Publisher: name: Roper Center for Public Opinion Research
Year: 2021

description: Following 2017 Virginia governor's race (1); chances of voting in governor's race (1); vote for Lieutenant Governor Ralph Northam vs. Edward Gillespie vs. Cliff Hyra (5); importance of voting in 2017 gubernatorial election (1); Northam/Gillespie would do a better job handling various issues (5); Northam/Gillespie has been conducting positive/negative campaign (2); President Donald Trump job performance (1); importance of view of Trump in Virginia governor's race vote (1); incumbent Attorney General Mark Herring vs. John Adams in 2017 election for Attorney General (1); Justin Fairfax vs. Virginia State Senator Jill Vogel for Lieutenant Governor (1).
Negative Differential Resistance Induced by Mn Substitution at SrRuO3/Nb:SrTiO3 Schottky Interfaces
Creators: name: Hikita, Y.
name: Kourkoutis, L. Fitting
name: Susaki, T.
name: Muller, D. A.
name: Takagi, H.
name: Hwang, H. Y.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We observed a strong modulation in the current-voltage characteristics of SrRuO$_3$/Nb:SrTiO$_3$ Schottky junctions by Mn substitution in SrRuO$_3$, which induces a metal-insulator transition in bulk. The temperature dependence of the junction ideality factor indicates an increased spatial inhomogeneity of the interface potential with substitution. Furthermore, negative differential resistance was observed at low temperatures, indicating the formation of a resonant state by Mn substitution. By spatially varying the position of the Mn dopants across the interface with single unit cell control, we can isolate the origin of this resonant state to the interface SrRuO$_3$ layer. These results demonstrate a conceptually different approach to controlling interface states by utilizing the highly sensitive response of conducting perovskites to impurities.
Medium resolution spectroscopy in Omega Centauri: abundances of 400 subgiant and turn-off region
Creators: name: Kayser, Andrea
name: Hilker, Michael
name: Richtler, Tom
name: Willemsen, Philip G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Medium resolution spectra of more than 400 subgiant and turn-off region stars in Omega Centauri were analysed. The observations were performed at the VLT/Paranal with FORS2/MXU. In order to determine the metallicities of the sample stars, we defined a set of line indices (mostly iron) adjusted to the resolution of our spectra. The indices as determined for Omega Centauri were then compared to line indices from stars in the chemically homogeneous globular cluster M55, in addition to standard stars and synthetic spectra. The uncertainties in the derived metallicities are of the order of 0.2 dex. Our study confirms the large variations in iron abundances found on the giant branch in earlier studies (-2.2
description: 14 pages, 18 figures, published in Astronomy and Astrophysics
Discovery of Super-Slow Rotating Asteroids with ATLAS and ZTF photometry
Creators: name: Erasmus, N.
name: Kramer, D.
name: McNeill, A.
name: Trilling, D. E.
name: van Rensburg, P. Janse
name: van Belle, G. T.
name: Tonry, J. L.
name: Denneau, L.
name: Heinze, A.
name: Weiland, H. J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We present here the discovery of a new class of super-slow rotating asteroids (P>1000 hours) in data extracted from the Asteroid Terrestrial-impact Last Alert System (ATLAS) and Zwicky Transient Facility (ZTF) all-sky surveys. Of the 39 rotation periods we report here, 32 have periods longer than any previously reported unambiguous rotation periods currently in the Asteroid Light Curve Database. In our sample, 7 objects have a rotation period > 4000 hours and the longest period we report here is 4812 hours (~200 days). We do not observe any correlation between taxonomy, albedo, or orbital properties with super-slow rotating status. The most plausible mechanism for the creation of these very slow rotators is if their rotations were slowed by YORP spin-down. Super-slow rotating asteroids may be common, with at least 0.4% of the main-belt asteroid population with a size range between 2 and 20 km in diameter rotating with periods longer than 1000 hours.
Switchover phenomenon induced by epidemic seeding on geometric networks
Creators: name: Ódor, Gergely
name: Czifra, Domonkos
name: Komjáthy, Júlia
name: Lovász, László
name: Karsai, Márton
Publisher: name: arXiv
Year: 2021
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Applied Physics (physics.app-ph)
subject: Applications (stat.AP)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: It is a fundamental question in disease modelling how the initial seeding of an epidemic, spreading over a network, determines its final outcome. Research in this topic has primarily concentrated on finding the seed configuration which infects the most individuals. Although these optimal configurations give insight into how the initial state affects the outcome of an epidemic, they are unlikely to occur in real life. In this paper we identify two important seeding scenarios, both motivated by historical data, that reveal a new complex phenomenon. In one scenario, the seeds are concentrated on the central nodes of a network, while in the second, they are spread uniformly in the population. Comparing the final size of the epidemic started from these two initial conditions through data-driven and synthetic simulations on real and modelled geometric metapopulation networks, we find evidence for a switchover phenomenon: When the basic reproduction number $R_0$ is close to its critical value, more individuals become infected in the first seeding scenario, but for larger values of $R_0$, the second scenario is more dangerous. We find that the switchover phenomenon is amplified by the geometric nature of the underlying network, and confirm our results via mathematically rigorous proofs, by mapping the network epidemic processes to bond percolation. Our results expand on the previous finding that in case of a single seed, the first scenario is always more dangerous, and further our understanding why the sizes of consecutive waves can differ even if their epidemic characters are similar.
description: 29 pages, 6 figures
Evidence for tidal interaction and merger as the origin of galaxy morphology evolution in compact groups
Creators: name: Coziol, R.
name: Plauchu-Frayn, I.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the results of a morphological study based on NIR images of 25 galaxies, with different levels of nuclear activity, in 8 Compact Groups of Galaxies (CGs). We perform independently two different analysis: a isophotal study and a study of morphological asymmetries. The results yielded by the two analysis are highly consistent. For the first time, it is possible to show that deviations from pure ellipses are produced by inhomogeneous stellar mass distributions related to galaxy interactions and mergers. We find evidence of mass asymmetries in 74% of the galaxies in our sample. In 59% of these cases, the asymmetries come in pairs, and are consistent with tidal effects produced by the proximity of companion galaxies. The symmetric galaxies are generally small in size or mass, inactive, and have an early-type morphology. In 20% of the galaxies we find evidence for cannibalism. In 36% of the early-type galaxies the color gradient is positive (blue nucleus) or flat. Summing up these results, as much as 52% of the galaxies in our sample could show evidence of an on going or past mergers. Our observations suggest that galaxies in CGs merge more frequently under ``dry'' conditions. The high frequency of interacting and merging galaxies observed in our study is consistent with the bias of our sample towards CGs of type B, which represents the most active phase in the evolution of the groups. In these groups we also find a strong correlation between asymmetries and nuclear activity in early-type galaxies. This correlation allows us to identify tidal interactions and mergers as the cause of galaxy morphology transformation in CGs.[abridge]
description: 64 pages, 35 figures. Accepted for publication in ApJ
Detection of Wolf-Rayet stars in host galaxies of Gamma-Ray Bursts (GRBs): are GRBs produced by runaway massive stars ejected from high stellar density regions ?
Creators: name: Hammer, F.
name: Flores, H.
name: Schaerer, D.
name: Dessauges-Zavadsky, M.
name: Floc'h, E. Le
name: Puech, M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have obtained deep spectroscopic observations of several nearby gamma-ray burst (GRB) host galaxies revealing for the first time the presence of Wolf-Rayet (WR) stars and numerous O stars located in rich and compact clusters or star forming regions. Surprisingly, high spatial resolution imaging shows that the GRBs and the associated supernovae did not occur in these regions, but several hundreds of parsec away. Considering various scenarios for GRB progenitors, we do not find any simple explanation of why they should be preferentially born in regions with low stellar densities. All the examined GRBs and associated SNe have occurred 400 to 800 pc from very high density stellar environments including large numbers of WR stars. Such distances can be travelled through at velocities of 100 km/s or larger, assuming the travel time to be the typical life time of WR stars. It leads us to suggest that GRB progenitors may be runaway massive stars ejected from compact massive star clusters. The ejection from such super star clusters may lead to a spin-up of these stars, producing the loss of the hydrogen and/or helium envelopes leading to the origin of the type Ibc supernovae associated with GRBs. If this scenario applies tocd text/Sc all GRBs, it provides a natural explanation of the very small fraction of massive stars that emit a GRB at the end of their life. An alternative to this scenario could be a binary origin for GRBs, but this still requires an explanation of why it would preferentially occur in low stellar density regions.
description: (1) GEPI, Observatoire de Paris-Meudon, France, (2) Observatoire de Geneve, Switzerland, (3) Laboratoire d'Astrophysique Toulouse-Tarbes, France,(4) Steward Observatory, University of Arizona, USA
The State-of-Practice in Requirements Elicitation: An Extended Interview Study at 12 Companies
Creators: name: Palomares, Cristina
name: Franch, Xavier
name: Quer, Carme
name: Chatzipetrou, Panagiota
name: López, Lidia
name: Gorschek, Tony
Publisher: name: arXiv
Year: 2021
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: Context. Requirements engineering remains a discipline that is faced with a large number of challenges, including the implementation of a requirements elicitation process in industry. Although several proposals have been suggested by researchers and academics, little is known of the practices that are actually followed in industry. Objective. We investigate the SoTA with respect to requirements elicitation, examining practitioners' practices. We focus on the techniques, the roles involved, and the challenges associated to the process. Method. We conducted an interview-based survey study involving 24 practitioners from 12 different Swedish IT companies. Results. We found that group interaction techniques, including meetings and workshops, are the most popular type of elicitation techniques that are employed by the practitioners, except in the case of small projects. We noted that customers are frequently involved in the elicitation process, except in the case of market-driven organizations. Technical staff (for example, developers and architects) are more frequently involved in the elicitation process compared to the involvement of business- or strategic staff. Finally, we identified a number of challenges with respect to stakeholders. These challenges include difficulties in understanding and prioritizing their needs. Further, it was noted that requirements instability (i.e., caused by changing needs or priorities) was a predominant challenge. These observations need to be interpreted in the context of the study. Conclusion. The relevant observations regarding the survey participants' experiences should be of interest to the industry; experiences that should be analyzed in the practitioners' context. Researchers may find evidence for the use of academic results in practice, thereby inspiring future theoretical work, as well as further empirical studies in the same area.
description: 32 pages, Accepted for publication in the Requirements Engineering Journal, 2021. Cite as Palomares, C., Franch, X., Quer, C. et al. The state-of-practice in requirements elicitation: an extended interview study at 12 companies. Requirements Eng (2021)
Energetics and structural properties of three-dimensional bosonic clusters near threshold
Creators: name: Hanna, G. J.
name: Blume, D.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We treat three-dimensional bosonic clusters wih up to N=40 atoms, interacting additively through two-body Van der Waals potentials, in the near-threshold regime. Our study inludes super-borromean systems with N atoms for which all subsystems are unbound. We determine the energetics and structural properties as the expectation value of the interparticle distance as a function of the coupling strength. It has been shown that the coupling strength g*(N), for which the N-body systems becomes unbound, is bounded by the coupling constant g*(N-1) for which the next smaller system with N-1 atoms becomes unbound, i.e., g*(N) >= (N-1)/Ng*(N-1). By fitting our numerically determined ground state energies to a simple functional form with three fitting parameters, we determine the relationship between g*(N) and g*(N-1). Our trimer and tetramer energies fall on the so-called Tjon line, which has been studied in nuclear physics. We confirm the existence of generalized Tjon lines for larger clusters. Signatures of the universal behavior of weakly-bound three-dimensional clusters can possibly be observed in ultracold Bose gases.
description: 12 pages, 12 figures
CP violation in Semi-Leptonic $τ$ decays
Creators: name: Delepine, David
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study CP violation in semi-leptonic $τ$ decays and we determine the conditions necessary to be able to define a observable CP asymmetry. We apply these conditions in both models, the standard model for the electroweak interactions and its supersymmetric extensions. In the first case, the leading order contribution to the direct CP asymmetry in $τ^{\pm} \to K^{\pm}π^0 ν_τ$ decay rates is evaluated. In the second case,we compute the SUSY effective hamiltonian that describes the $|ΔS|=1$ semileptonic decays of tau leptons. We show that SUSY contributions may enhance the CP asymmetry of $τ\to K πν_τ$ decays by several orders of magnitude compared to the standard model expectations.
description: 8 pages, 3 figures, To appear in the proceedings of 6th Latin American Symposium on High Energy Physics (VI-SILAFAE), Puerto Vallarta, Mexico, November 1-8, 2006
Matrix-Pencil Approach-Based Interference Mitigation for FMCW Radar Systems
Creators: name: Wang, Jianping
name: Ding, Min
name: Yarovoy, Alexander
Publisher: name: arXiv
Year: 2021
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: A novel matrix pencil-based interference mitigation approach for FMCW radars is proposed in this paper. The interference-contaminated segment of the beat signal is firstly cut out and then the signal samples in the cut-out region are reconstructed by modeling the beat signal as a sum of complex exponentials and using the matrix pencil method to estimate their parameters. The efficiency of the proposed approach for the interference with different parameters (i.e. interference duration, signal-to-noise ratio (SNR), and different target scenarios) is investigated by means of numerical simulations. The proposed interference mitigation approach is intensively verified on experimental data. Comparisons of the proposed approach with the zeroing and other beat-frequency interpolation techniques are presented. The results indicate the broad applicability and superiority of the proposed approach, especially in low SNR and long interference duration situations.
description: 15 pages, 14 figures
Hole Localization in One-Dimensional Doped Anderson-Hubbard Model
Creators: name: Okumura, M.
name: Yamada, S.
name: Taniguchi, N.
name: Machida, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study the interplay of disorder and correlation in the one-dimensional hole-doped Hubbard-model with disorder (Anderson-Hubbard model) by using the density-matrix renormalization group method. Concentrating on the doped-hole density profile, we find in a large $U/t$ regime that the clean system exhibits a simple fluid-like behavior whereas finite disorders create locally Mott regions which expand their area with increasing the disorder strength contrary to the ordinary sense. We propose that such an anomalous Mott phase formation assisted by disorder is observable in atomic Fermi gases by setup of the box shape trap.
On the 4D effective theory in warped compactifications with fluxes and branes
Creators: name: Koyama, Kazuya
name: Koyama, Kayoko
name: Arroja, Frederico
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present a systematic way to derive the four-dimensional effective theories for warped compactifications with fluxes and branes in the ten-dimensional type IIB supergravity. The ten-dimensional equations of motion are solved using the gradient expansion method and the effective four-dimensional equations of motions are derived by imposing the consistency condition that the total derivative terms with respect to the six-dimensional internal coordinates vanish when integrated over the internal manifold. By solving the effective four-dimensional equations, we can find the gravitational backreaction to the warped geometry due to the dynamics of moduli fields, branes and fluxes.
description: 12 pages
Modified quantum delayed-choice experiment without quantum control
Creators: name: Guo, Qi
name: Zhang, Wen-Jie
name: Li, Gang
name: Zhang, Tiancai
name: Wang, Hong-Fu
name: Zhang, Shou
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Wheeler's delayed-choice experiment delays the decision to observe either the wave or particle behavior of a photon until after it has entered the interferometer, and the quantum delayed-choice experiment provides the possibility of observing the wave and particle behavior simultaneously by introducing quantum control device. We here propose a modified quantum delayed-choice experiment without quantum control or entanglement assistance, in which a photon can be prepared in a wave-particle superposition state and the morphing behavior of wave-to-particle transition can be observed easily. It is demonstrated that the presented scheme can allow us to rule out classical hidden variable models in a device-independent manner via violating dimension witness. We also extend the scheme to the situation of two degrees of freedom, first constructing a hybrid quantum delayed-choice experiment which enables simultaneous observation of a photon's wave and particle behaviors in different degrees of freedom, and then proposing a scheme to prepare the single-photon wave-particle entanglement. This study is not only meaningful to explore the wave and particle properties of photons, but also provides potential for the research of the single-particle nonlocality from the perspective of the wave-particle degree of freedom.
description: 17 pages, 5 figures
Private life of the Liouville field that causes new anomalies in the Nambu-Goto string
Creators: name: Makeenko, Yuri
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: I consider higher-order terms of the Seeley expansion of the heat kernel, which for smooth metrics are suppressed as inverse powers of the UV cutoff $Λ$, and demonstrate how they result in an anomalous contribution to the string effective action after doing uncertainties $Λ^{-2}\times Λ^2$. For the Polyakov string these anomalies precisely reproduce at one loop the result of KPZ-DDK obtained for the Liouville theory by the conformal field theory technique. For the Nambu-Goto string I find a deviation from this result which shows that the two string formulations may differ.
description: 21 pages, 5 figures; v2: slightly polished
Critical tunneling currents in the regime of bilayer excitons
Creators: name: Tiemann, L.
name: Dietsche, W.
name: Hauser, M.
name: von Klitzing, K.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We have investigated the tunneling properties of an electron double quantum well system where the lowest Landau level of each quantum well is half filled. This system is expected to be a Bose condensate of excitons. Our four-terminal dc measurements reveal a nearly vanishing interlayer voltage and the existence of critical tunneling currents which depend on the strength of the condensate state.
description: To appear in "Focus on Quantum Correlations in Tailored Matter" in the New Journal of Physics
On the experimental feasibility of continuous-variable optical entanglement distillation
Creators: name: Eisert, J.
name: Plenio, M. B.
name: Browne, D. E.
name: Scheel, S.
name: Feito, A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Entanglement distillation aims at preparing highly entangled states out of a supply of weakly entangled pairs, using local devices and classical communication only. In this note we discuss the experimentally feasible schemes for optical continuous-variable entanglement distillation that have been presented in [D.E. Browne, J. Eisert, S. Scheel, and M.B. Plenio, Phys. Rev. A 67, 062320 (2003)] and [J. Eisert, D.E. Browne, S. Scheel, and M.B. Plenio, Annals of Physics (NY) 311, 431 (2004)]. We emphasize their versatility in particular with regards to the detection process and discuss the merits of the two proposed detection schemes, namely photo-detection and homodyne detection, in the light of experimental realizations of this idea becoming more and more feasible.
description: 5 pages, 5 figures, contribution to conference proceedings
Dipolar interaction effects in the magnetic and magnetotransport properties of ordered nanoparticle arrays
Creators: name: Kechrakos, D.
name: Trohidou, K. N.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Assemblies of magnetic nanoparticles exhibit interesting physical properties arising from the competition of intraparticle dynamics and interparticle interactions. In ordered arrays of magnetic nanoparticles magnetostatic interparticle interactions introduce collective dynamics acting competitively to random anisotropy. Basic understanding, characterization and control of dipolar interaction effects in arrays of magnetic nanoparticles is an issue of central importance. To this end, numerical simulation techniques offer an indispensable tool. We report on Monte Carlo studies of the magnetic hysteresis and spin-dependent transport in thin films formed by ordered arrays of magnetic nanoparticles. Emphasis is given to the modifications of the single-particle behavior due to interparticle dipolar interactions as these arise in quantities of experimental interest, such as, the magnetization, the susceptibility and the magnetoresistance. We investigate the role of the structural parameters of an array (interparticle separation, number of stacked monolayers) and the role of the internal structure of the nanoparticles (single phase, core-shell). Dipolar interactions are responsible for anisotropic magnetic behavior between the in-plane and out-of-plane directions of the sample, which is reflected on the investigated magnetic properties (magnetization, transverse susceptibility and magnetoresistance) and the parameters of the array (remanent magnetization, coercive field, and blocking temperature). Our numerical results are compared to existing measurements on self-assembled arrays of Fe-based and Co nanoparticles is made.
description: 16 pages, 14 figures
Asymptotically Hyperbolic Metrics on Unit Ball Admitting Multiple Horizons
Creators: name: Li, ZhenYang
name: Shi, YuGuang
name: Wu, Peng
Publisher: name: arXiv
Year: 2007
Subjects: subject: Differential Geometry (math.DG)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 83C57, 53C44

description: In this paper, we construct an asymptotically hyperbolic metric with scalar curvature -6 on unit ball $\mathbf{D}^3$, which contains multiple horizons.
description: 11pages
Monotone cubic spline interpolation for functions with a strong gradient
Creators: name: Aràndiga, Francesc
name: Baeza, Antonio
name: Yáñez, Dionisio F.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: Spline interpolation has been used in several applications due to its favorable properties regarding smoothness and accuracy of the interpolant. However, when there exists a discontinuity or a steep gradient in the data, some artifacts can appear due to the Gibbs phenomenon. Also, preservation of data monotonicity is a requirement in some applications, and that property is not automatically verified by the interpolator. In this paper, we study sufficient conditions to obtain monotone cubic splines based on Hermite cubic interpolators and propose different ways to construct them using non-linear formulas. The order of approximation, in each case, is calculated and several numerical experiments are performed to contrast the theoretical results.
QCD Review
Creators: name: Marchesini, Giuseppe
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: This review is focused on QCD theoretical issues and their phenomenological relevance specially for LHC. It is incomplete and mostly neglects the phenomenology of long distance physics
description: Plenary talk at 33rd International Conference on High-Energy Physics (ICHEP 06), Moscow, Russia, July 26 - August 2, 2006
Πολιτικό Ισλάμ και Κυριαρχία. Η διαδρομή του πολιτικού Ισλάμ στην Τουρκία και η πρόκληση του ISIS.
Creators: name: Βέρρου, Μαρίνα Στυλιανού
Publisher: name: Aristotle University of Thessaloniki
Year: 2016
Subjects: Πολιτικό Ισλάμ
Το Πολιτικό Ισλάμ στην Τουρκία
ISIS
Political Islam
Political Islam in Turkey

description: Σκοπός της εργασίας, ήταν να εξετάσει τη διαδρομή και την εξέλιξη του Ισλάμ, ως στοιχείο πολιτικό. Αφού αρχικά λαμβάνεται ως βάση η θρησκευτική όψη του Ισλάμ, στη συνέχεια η ανάλυση προχωρά στο βάθος κάποιων εννοιών, όπως αυτή της πολιτικής θρησκείας, της κυριαρχίας και του πολιτικού Ισλάμ, ως γενική έννοια, αλλά και ως ειδική στην περίπτωση της Τουρκίας. Η σταδιοδρομία του πολιτικού Ισλάμ στο τουρκικό κράτος, ήταν κάτι που εξακολουθεί να απασχολεί, μέσα από ιστορικά γεγονότα, πολιτικά και ιδεολογικά. Ο ρόλος του πολιτικού Ισλάμ στη Τουρκία, αναδύθηκε μέσα από τα ισλαμικά κινήματα και τους πολιτικούς που πέρασαν κατά καιρούς, αλλά και άλλους που ακόμη κυβερνούν. Το τουρκικό έθνος, επηρεασμένο από το Ισλάμ, παρά τον εκσυγχρονισμό του και την υιοθέτηση των δυτικών προτύπων, δεν παύει να εμπλέκεται σε ακραία ισλαμικά φαινόμενα. Στη συνέχεια του κειμένου, συναντάμε μία πλέον ενδιαφέρουσα οργάνωση, που κλονίζει παγκοσμίως την αίσθηση της ασφάλειας. Η εμφάνιση του ISIL ή ISIS, απέδειξε πως η τρομοκρατία συνυπάρχει με την βαρβαρότητα, σε σημείο ακραίο και φρικιαστικό. Την τρομοκρατία του ISIS, υπηρετούν μαχητές με αντιλήψεις άλλου αιώνα.
description: The aim of the thesis was to examine the path and evolution of Islam as a political element. After initially taken as a basis the religious aspect of Islam, then the analysis proceeds to the depth of some concepts, such as the civil religion, sovereignty and political Islam, as a general concept, but as a special case in Turkey. The route of political Islam in the Turkish state, crossed through historical events, political and ideological. The role of political Islam in Turkey, rose from the Islamic movements and politicians. The Turkish nation, influenced by Islam, despite the modernization and the adoption of Western standards, it is still involved in Islamic extreme phenomena. Then, we find an interesting organization, that shakes the global sense of security. The emergence of ISIL or ISIS, demonstrated that terrorism coexists with brutality. The terrorism of ISIS, is served by fighters with perceptions of another century.
Η ανακήρυξη νέων Αγίων επί της Πατριαρχίας του Οικουμενικού Πατριάρχη Βαρθολομαίου Α΄.
Creators: name: Καζαντζόγλου, Σοφία Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2016
Subjects: Οικουμενικός Πατριάρχης Βαρθολομαίος
Ανακήρυξη
Άγιοι
Ecumenical Patriarch Bartholomew I
Declaration
Saints

description: Στην παρούσα εργασία, επιχειρήσαμε να παρουσιάσουμε το σύνολο των αγίων που αναγνωρίστηκαν επίσημα μέσα από Κανονικές και Συνοδικές Πράξεις του Οικουμενικού Πατριαρχείου, επί της Πατριαρχίας του Οικουμενικού Πατριάρχη κ.κ. Βαρθολομαίου Α’, δηλαδή από την ημέρα της ενθρόνισης του (2/11/1991) μέχρι και σήμερα. Αρχικά, γίνεται μια ιστορική αναδρομή στην διαμόρφωση των εννοιών Άγιος και Αγιότητα. Ακολουθεί μια ιστορική ανασκόπηση στον τρόπο και την διαδικασία αναγνώρισης των αγίων από τα πρώιμα χρόνια έως σήμερα, η οποία αρχικά ήταν απλή και αργότερα άρχισε να θεσμοποιείται. Παρουσιάσαμε έναν αρκετά μεγάλο αριθμό αγίων, και συγκεκριμένα 39 αγίων, οι οποίοι κοσμούν πλέον τον πολύφωτο ουρανό της εκκλησίας. Γίνεται μια σύντομη αναφορά στον βίο του κάθε αγίου, λαμβάνοντας υπ’ όψιν τις σχετικές Πατριαρχικές Συνοδικές Πράξεις. Τέλος, αποτελεί ιδιαίτερη τιμή για την Πατριαρχία του νυν Οικουμενικού Πατριάρχη η αγιοκατάταξη τόσων πολλών αγίων και ένδειξη σπουδαίας αγιοφιλίας.
description: In the present study, we tried to present all the saints officially recognized through Canonical and Synodal Acts of the Ecumenical Patriarchate as long as Ecumenical Patriarch Bartholomew 1st is at the head of the Patriarchate, i.e. from the day of his enthronement (02/11/1991) until today. The formation of the terms Saint and Sanctity is initially examined in a short historical review. Subsequently, the process of Saints recognizing from the ancient era until today is reviewed. The relevant process was initially simple and progressively became institutionalized. A total number of 39 recognized saints, that adorn the Church’s sky-chandelier is reported. For each one of the above saints, a brief presentation of his/her life is given, using as a resource the relevant Patriarchic Synodal Acts. The recognition of such a large number of saints consists a great honor for the current Ecumenical Patriarch.