cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Unified FSM treatment of CP physics extended to hidden sector giving (i) $δ_{CP}$ for leptons as prediction, (ii) new hints on the material content of the universe
Creators: name: Bordes, José
name: Chan, H. M.
name: Tsou, S. T.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: A unified treatment of CP physics for quarks and leptons in the framed standard model (FSM) is extended to include the predicted hidden sector giving as consequences: (i) that an earlier part-estimate of the Jarlskog invariant $J'$ for leptons is turned into a prediction for its actual value, i.e., $J' \sim -0.012$ ($δ'_{CP} \sim 1.11 π$), which is of the right order of magnitude, of the right sign, and in the range of values favoured by present experiment, (ii) some novel twists to the effects of CP-violation on the material content of the universe.
A study of outer disk stellar populations of face-on star-forming galaxies in SDSS-IV MaNGA: causes of H$α$ deficiency
Creators: name: Kauffmann, Guinevere
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Integral field unit (IFU) spectra of face-on star-forming galaxies from the MaNGA survey are stacked in radial bins so as to reach a S/N high enough to measure emission lines and Lick indices out to 2.5-3 R_e. Two thirds of galaxies have stellar populations in the outer disks that are older, more metal poor and less dusty than in the inner disks. Recent bursts of star formation have occurred more frequently in the outer disk, but extinction-corrected Halpha equivalent widths are significantly lower at fixed D_n(4000) in these regions. I examine the properties of a subset of galaxies with the the most H$α$ deficient outer disks. These regions contain young stellar populations that must have formed within the last 0.5 Gyr, but extinction-corrected Halpha values well below the values predicted for a standard Kroupa IMF. The Halpha deficient galaxies have flat D_n(4000) and Hdelta_A profiles with little radial fluctuation, indicating that star formation has occurred extremely uniformly across the entire disk. The H$α$ line profiles indicate that the ionized gas kinematics is also very regular across the disk. The main clue to the origin of the Halpha deficiency is that it sets in at the same radius where the dust extinction abruptly decreases, suggesting a mode of star formation deficient in massive stars in quiescent, HI-dominated gas. Finally, I have carried out a search for galaxies with signatures of unusual Halpha kinematics and find that 15% of the sample exhibit evidence for significant ionized gas that is displaced from the systemic velocity of the disk.
description: 16 pages, 15 figures, accepted for publication in MNRAS
The lack of rotation in a moving right angle lever
Creators: name: Franklin, Jerrold
Publisher: name: arXiv
Year: 2008
Subjects: subject: Classical Physics (physics.class-ph)
subject: History and Philosophy of Physics (physics.hist-ph)
subject: FOS: Physical sciences

description: The absence of any tendency toward rotation in a moving right angle lever is given a simple explanation.
description: Appendix added with discussion of previous interpretations. To be published in European Journal of Physics
A study of the central stellar populations of galaxies in SDSS-IV MaNGA: identification of a sub-sample with unusually young and massive stars
Creators: name: Kauffmann, Guinevere
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: This paper describes a search for galaxy centers with clear indications of unusual stellar populations with an initial mass function flatter than Salpeter at high stellar masses. Out of a sample of 668 face-on galaxies with stellar masses in the range 10^10- 10^11 M_sol, I identify 15 galaxies with young to intermediate age central stellar populations with unusual stellar population gradients in the inner regions of the galaxy. In these galaxies, the 4000 Angstrom break is either flat or rising towards the center of the galaxy, indicating that the central regions host evolved stars, but the H$α$ equivalent width also rises steeply in the central regions. The ionization parameter [OIII]/[OII] is typically low in these galactic centers, indicating that ionizing sources are stellar rather than AGN. Wolf Rayet features characteristic of hot young stars are often found in the spectra and these also get progressively stronger at smaller galactocentric radii. These outliers are compared to a control sample of galaxies of similar mass with young inner stellar populations, but where the gradients in Halpha equivalent width and 4000 Angstrom break follow each other more closely. The outliers exhibit central Wolf Rayet red bump excesses much more frequently, they have higher central stellar and ionized gas metallicities, and they are also more frequently detected at 20 cm radio wavelengths. I highlight one outlier where the ionized gas is clearly being strongly perturbed and blown out either by massive stars after they explode as supernovae, or by energy injection from matter falling onto a black hole.
description: 16 pages, 16 figures, accepted for publication in MNRAS
Host Galaxies of Luminous Quasars: Structural Properties and the Fundamental Plane
Creators: name: Wolf, Marsha J.
name: Sheinis, Andrew I.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present stellar velocity dispersion measurements in the host galaxies of 10 luminous quasars (M_V < -23) using the Ca H&K lines in off-nuclear spectra. We combine these data with effective radii and magnitudes from the literature to place the host galaxies on the Fundamental Plane (FP) where their properties are compared to other types of galaxies. We find that the radio-loud (RL) QSO hosts have similar properties to massive elliptical galaxies, while the radio-quiet (RQ) hosts are more similar to intermediate mass galaxies. The RL hosts lie at the upper extreme of the FP due to their large velocity dispersions ( = 321 km s^-1), low surface brightness ( = 20.8 mag arcsec^-2), and large effective radii ( = 11.4 kpc), and have = 1.5 x 10^12 M_sun and = 12.4. In contrast, properties of the RQ hosts are = 241 km s^-1, ~ 4.4 x 10^11 M_sun, and ~ 5.3. The distinction between these galaxies occurs at sigma_* ~ 300 km s^-1, R_e ~ 6 kpc, and corresponding M_* ~ 5.9 +/- 3.5 x 10^11 M_sun. Our data support previous results that PG QSOs are related to gas-rich galaxy mergers that form intermediate-mass galaxies, while RL QSOs reside in massive early-type galaxies, most of which also show signs of recent mergers or interactions. Most previous work has drawn these conclusions by using estimates of the black hole mass and inferring host galaxy properties from that, while here we have relied purely on directly measured host galaxy properties.
description: 50 pages, 15 figures, accepted by AJ
The general applicability of self-similar solutions for thermal disc winds
Creators: name: Sellek, Andrew D.
name: Clarke, Cathie J.
name: Booth, Richard A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Thermal disc winds occur in many contexts and may be particularly important to the secular evolution and dispersal of protoplanetary discs heated by high energy radiation from their central star. In this paper we generalise previous models of self-similar thermal winds - which have self-consistent morphology and variation of flow variables - to the case of launch from an elevated base and to non-isothermal conditions. These solutions are well-reproduced by hydrodynamic simulations, in which, as in the case of isothermal winds launched from the mid-plane, we find winds launch at the maximum Mach number for which the streamline solutions extend to infinity without encountering a singularity. We explain this behaviour based on the fact that lower Mach number solutions do not fill the spatial domain. We also show that hydrodynamic simulations reflect the corresponding self-similar models across a range of conditions appropriate to photoevaporating protoplanetary discs, even when gravity, centrifugal forces, or changes in the density gradient mean the problem is not inherently scale free. Of all the parameters varied, the elevation of the wind base affected the launch velocity and flow morphology most strongly, with temperature gradients causing only minor differences. We explore how launching from an elevated base affects Ne II line profiles from winds, finding it increases (reduces) the full width at half maximum (FWHM) of the line at low (high) inclination to the line of sight compared with models launched from the disc mid-plane and thus weakens the dependence of the FWHM on inclination.
description: 21 pages, 16 figures, accepted after revision for publication in MNRAS
Cluster Magnetic Fields from Galactic Outflows
Creators: name: Donnert, J.
name: Dolag, K.
name: Lesch, H.
name: Müller, E.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We performed cosmological, magneto-hydrodynamical simulations to follow the evolution of magnetic fields in galaxy clusters, exploring the possibility that the origin of the magnetic seed fields are galactic outflows during the star-burst phase of galactic evolution. To do this we coupled a semi-analytical model for magnetized galactic winds as suggested by \citet{2006MNRAS.370..319B} to our cosmological simulation. We find that the strength and structure of magnetic fields observed in galaxy clusters are well reproduced for a wide range of model parameters for the magnetized, galactic winds and do only weakly depend on the exact magnetic structure within the assumed galactic outflows. Although the evolution of a primordial magnetic seed field shows no significant differences to that of galaxy clusters fields from previous studies, we find that the magnetic field pollution in the diffuse medium within filaments is below the level predicted by scenarios with pure primordial magnetic seed field. We therefore conclude that magnetized galactic outflows and their subsequent evolution within the intra-cluster medium can fully account for the observed magnetic fields in galaxy clusters. Our findings also suggest that measuring cosmological magnetic fields in low-density environments such as filaments is much more useful than observing cluster magnetic fields to infer their possible origin.
description: Minor revision for publication in MNRAS
Annealing of GaA1As double heterostructures with homogeneous ruby laser light
Creators: name: Brett, Michael Julian
Publisher: name: University of British Columbia
Year: 2010

description: The output from a ruby laser was homogenized, and used to laser anneal the active layer of GaA1As double heterostructure wafers in an attempt to improve the radiative efficiency of the active layer. At anneal energies exceeding the estimated threshold for melting of the active layer, the radiative efficiency was reduced by a factor of two. Subsequently, semiconductor laser diodes fabricated from laser annealed heterostructures performed much worse than those fabricated from unannealed heterostructures.
Deriving CSW rules for massive scalar legs and pure Yang-Mills loops
Creators: name: Boels, Rutger
name: Schwinn, Christian
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: This article provides two complementary detailed derivations of Cachazo-Svrcek-Witten-style Feynman rules for Yang-Mills gauge theory coupled to a massive coloured scalar as presented in earlier work. These proceed through a direct canonical transformation method on space-time and through a gauge transformation in an action constructed on twistor space. It is shown explicitly that the field transformations are identical in both cases. Some simple tree-level examples of our rules are given and we comment on the application of them to the calculation of the rational part of one-loop pure glue amplitudes. A possible direct quantum completion of pure glue CSW rules based on dimensional regularisation motivated by these results is sketched. Finally, it is shown how to derive CSW rules for effective Higgs-gluon and Higgs-matter couplings proposed in the literature directly from the action. This derivation yields additional towers of vertices which generate a subset of the contributions to effective multi-Higgs scattering amplitudes.
description: 58 pages, JHEP3.cls. v2: typos corrected, reference added, slightly expanded discussion of color structures w.r.t. JHEP version
Letter from Kathleen Raine to Robin Skelton, [October 23, 1953]
Creators: name: Raine, Kathleen, 1908-2003
Publisher: name: University of Victoria Libraries
Year: 2023
Subjects: subject: Critics
valueUri: http://id.worldcat.org/fast/883769
subject: Philosophy
valueUri: http://id.worldcat.org/fast/1060777
subject: FOS: Philosophy, ethics and religion
subject: Periodical editors
valueUri: http://id.worldcat.org/fast/1058064
subject: Platonists
valueUri: http://id.worldcat.org/fast/1066881
subject: English poetry--Manuscripts
valueUri: http://id.worldcat.org/fast/912320
subject: Scholars
valueUri: http://id.worldcat.org/fast/1106878
subject: Literature, Modern
valueUri: http://id.worldcat.org/fast/1000172
subject: Neoplatonism
valueUri: http://id.worldcat.org/fast/1035884
subject: Wiccans
valueUri: http://id.worldcat.org/fast/1765210
subject: Poets, English
valueUri: http://id.worldcat.org/fast/1067870
subject: Book industries and trade
valueUri: http://id.worldcat.org/fast/836171
subject: Periodicals--Publishing
valueUri: http://id.worldcat.org/fast/1058100
subject: Editors
valueUri: http://id.worldcat.org/fast/902475
subject: Novelists
valueUri: http://id.worldcat.org/fast/1039684
subject: Novelists, English
valueUri: http://id.worldcat.org/fast/1039718
subject: Authors
valueUri: http://id.worldcat.org/fast/821688
subject: Poets
valueUri: http://id.worldcat.org/fast/1067778
subject: Skelton, Robin
valueUri: http://id.worldcat.org/fast/51853
subject: Raine, Kathleen, 1908-2003
valueUri: http://id.worldcat.org/fast/52672
subject: Authors, English
valueUri: http://id.worldcat.org/fast/821945

description: Part of a collection of correspondence from Kathleen Raine to Robin Skelton. Skelton was a British poet, academic, anthologist, and practicing Wiccan. He taught at Manchester University before emigrating to Canada in 1963, where he taught creative writing at the University of Victoria and started the literary magazine The Malahat Review. Also included are some letters to Skelton’s wife Sylvia, and his daughters. Spanning close to forty-five years, the correspondence discusses poetry, writing, and philosophy; particularly Platonism and Neoplatonism. Raine often refers to the writings of William Blake and W. B. Yeats. Many letters also mention contemporary literary figures at the time including: Herbert Read, Peter Russell, Liam Miller, and Thurairajah Tambimuttu. In this letter Raine discusses poetry and symbolism. She also mentions Wilfred Childe and Geoffrey Keynes.
УПРАВЛЕНИЕ ПЛАСТОВЫМИ ВОДАМИ В НЕФТЯНЫХ МЕСТОРОЖДЕНИЯХ ЙЕМЕНА: КОНТРОЛЬ МИНЕРАЛИЗАЦИИ, КОРРОЗИИ ОБОРУДОВАНИЯ И ЭКОЛОГИЧЕСКИЕ АСПЕКТЫ
Creators: name: Аль-Беадуни Абдулкадер Омар
name: Шараф Алдин Моад Али Али Абдулла
name: Саид Али джамил Мохаммед
name: Касем Гассан Касем Али Мохаммед
Publisher: name: Zenodo
Year: 2025
Subjects: Ключевые слова: пластовые воды, высокоминерализованные коллекторы, коррозия оборудования, ингибиторы, мембранная фильтрация, экологические аспекты, нефтяные месторождения Йемена, устойчивое управление водными ресурсами, химический состав пластовых вод, фильтрационные технологии
Keywords: Formation waters, highly mineralized reservoirs, equipment corrosion, inhibitors, membrane filtration, environmental aspects, Yemen oil fields, sustainable water resource management, chemical composition of formation waters, filtration technologies

description: Аннотация:Статья посвящена проблеме управления пластовыми водами в нефтяных месторождениях Йемена, где повышенная минерализация и агрессивный химический состав вызывают коррозию оборудования и экологические риски. Автор анализирует ключевые факторы, влияющие на коррозионные процессы, рассматривает опыт подбора ингибиторов и технологий очистки, включая методы мембранной фильтрации. Показана роль постоянного мониторинга и адаптации технологических решений к составу пластовых вод, а также значимость учёта логистических ограничений в регионе. Особое внимание уделено экологической составляющей, связанной с возможностью негативного воздействия на грунтовые и поверхностные воды. Делается вывод о том, что комплексный подход, сочетающий химический анализ, внедрение ингибиторов и технологии очистки, обеспечивает устойчивую и безопасную разработку нефтяных месторождений.

Abstract:       The paper addresses the issue of managing formation water in Yemeni oilfields, where high mineralization and a chemically aggressive environment pose risks of equipment corrosion and adverse ecological impact. The author analyzes key factors affecting corrosion, examines the selection of inhibitors and filtration technologies—especially membrane-based methods—and highlights the importance of continuous monitoring and adapting technological solutions to the specific properties of formation water. Consideration is also given to logistical constraints in the region, as well as to the environmental implications associated with potential contamination of groundwater and surface water. The conclusion is that a comprehensive strategy combining chemical analysis, inhibitor implementation, and advanced water treatment techniques fosters both stable production and environmental safety in oilfield operations.
A Geometric Criterion for the Optimal Spreading of Active Polymers in Porous Media
Creators: name: Kurzthaler, Christina
name: Mandal, Suvendu
name: Bhattacharjee, Tapomoy
name: Löwen, Hartmut
name: Datta, Sujit S.
name: Stone, Howard A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We perform Brownian dynamics simulations of active stiff polymers undergoing run-reverse dynamics, and so mimic bacterial swimming, in porous media. In accord with recent experiments of \emph{Escherichia coli}, the polymer dynamics are characterized by trapping phases interrupted by directed hopping motion through the pores. We find that the effective translational diffusivities of run-reverse agents can be enhanced up to two orders in magnitude, compared to their non-reversing counterparts, and exhibit a non-monotonic behavior as a function of the reversal rate, which we rationalize using a coarse-grained model. Furthermore, we discover a geometric criterion for the optimal spreading, which emerges when their run lengths are comparable to the longest straight path available in the porous medium. More significantly, our criterion unifies results for porous media with disparate pore sizes and shapes and thus provides a fundamental principle for optimal transport of microorganisms and cargo-carriers in densely-packed biological and environmental settings.
Observations of the Gas Reservoir around a Star Forming Galaxy in the Early Universe
Creators: name: Frye, Brenda L.
name: Bowen, David. V.
name: Hurley, Mairead
name: Tripp, Todd M.
name: Fan, Xiaohui
name: Holden, Bradley
name: Guhathakurta, Puragra
name: Coe, Dan
name: Broadhurst, Tom
name: Egami, Eiichi
name: Meylan, G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a high signal-to-noise spectrum of a bright galaxy at z = 4.9 in 14 h of integration on VLT FORS2. This galaxy is extremely bright, i_850 = 23.10 +/- 0.01, and is strongly-lensed by the foreground massive galaxy cluster Abell 1689 (z=0.18). Stellar continuum is seen longward of the Ly-alpha emission line at ~7100 Å, while intergalactic H I produces strong absorption shortward of Ly-alpha. Two transmission spikes at ~6800 Angstroms (A) and ~7040 A are also visible, along with other structures at shorter wavelengths. Although fainter than a QSO, the absence of a strong central ultraviolet flux source in this star forming galaxy enables a measurement of the H I flux transmission in the intergalactic medium (IGM) in the vicinity of a high redshift object. We find that the effective H I optical depth of the IGM is remarkably high within a large 14 Mpc (physical) region surrounding the galaxy compared to that seen towards QSOs at similar redshifts. Evidently, this high-redshift galaxy is located in a region of space where the amount of H I is much larger than that seen at similar epochs in the diffuse IGM. We argue that observations of high-redshift galaxies like this one provide unique insights on the nascent stages of baryonic large-scale structures that evolve into the filamentary cosmic web of galaxies and clusters of galaxies observed in the present universe.
description: Accepted for publication in ApJL (corrected typos)
Radio continuum observations of the supernova remnant G109,1-1.0
Creators: name: Braun, Robert
Publisher: name: University of British Columbia
Year: 2010

description: The supernova remnant G109.1-1.0 was observed differentially at 6 cm wavelength using the 91 m transit telescope of the NRAO at Green Bank, West Virginia. After development of a complete declination dependent model of the 6 cm differential response, the observations were restored to the equivalent total intensity observations using the method described by D.T. Emerson et al. (1979) as well as the maximum entropy method of image reconstruction (Gull and Daniell 1978). Both approaches gave successful reconstructions of the field at similar computational costs. The maximum entropy method is shown to provide effective reconstruction even under the sparser sampling conditions of the Gregory-Taylor (1981) survey; allowing the direct application of this work to the majority of the differentially recorded survey data base. The 6 cm observations of G109.1-1.0 indicate an extended half-disc structure which is similar in both shape and extent to the X-ray emission (Gregory and Fahlman 1980) from the remnant. An unusual feature has also become apparent which extends from the northern edge of the remnant for 35 arcmin radially away from the center to the north-west. The generally semicircular shape of the remnant, as indicated by both the X-ray and radio observations, can be understood in terms of an interaction with an adjacent molecular cloud.
Qubit-based momentum measurement of a particle
Creators: name: Konrad, Bernd
name: Di Pumpo, Fabio
name: Freyberger, Matthias
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: An early approach to include pointers representing measurement devices into quantum mechanics was given by von Neumann. Based on this idea, we model such pointers by qubits and couple them to a free particle, in analogy to a classical time-of-flight arrangement. The corresponding Heisenberg dynamics leads to pointer observables whose expectation values allow us to reconstruct the particle's momentum distribution via the characteristic function. We investigate different initial qubit states and find that such a reconstruction can be considerably simplified by initially entangled pointers.
description: 6 pages, 1 figure
title: Shiitake :
title: Directrices para la ejecución del examen de la distinción, la homogeneidad y la estabilidad.
titleType: Subtitle
Creators: name: International Union For The Protection Of New Varieties Of Plants,
Publisher: name: International Union for the Protection of New Varieties of Plants,
Year: 0
Subjects: Plants
New Varieties of Plants
Shiitake

description: La finalidad de estas directrices (“directrices de examen”) es elaborar los principios que figuran en la Introducción General (documento TG/1/3) y sus documentos TGP conexos, con objeto de que sirvan de orientación práctica y detallada para el examen armonizado de la distinción, homogeneidad y estabilidad (DHE) y en particular, para identificar los caracteres apropiados para el examen DHE y producir descripciones armonizadas de variedades.
Gamma-Ray Flash in the Interaction of a Tightly Focused Single-Cycle Ultraintense Laser Pulse with a Solid Target
Creators: name: Hadjisolomou, P.
name: Jeong, T. M.
name: Valenta, P.
name: Kolenaty, D.
name: Versaci, R.
name: Olšovcová, V.
name: Ridgers, C. P.
name: Bulanov, S. V.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: We employ the $λ^3$ regime where a near-single-cycle laser pulse is tightly focused, thus providing the highest possible intensity for the minimal energy at a certain laser power. The quantum electrodynamics processes in the course of the interaction of the ultraintense laser with a solid target are studied via three-dimensional particle-in-cell simulations, revealing the generation of copious $γ$-photons and electron-positron pairs. The parametric study on the laser polarisation, target thickness and electron number density shows that the radially polarised laser provides the optimal regime for $γ$-photon generation. By varying the laser power in the range of 1 to 300 petawatt we find the scaling of the laser to $γ$-photon energy conversion efficiency. The laser-generated $γ$-photon interaction with a high-Z target is further studied by using Monte Carlo simulations revealing further electron-positron pair generation and radioactive nuclides creation.
Self-doping and the Mott-Kondo scenario for infinite-layer nickelate superconductors
Creators: name: Yang, Yi-feng
name: Zhang, Guang-Ming
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We give a brief review of the Mott-Kondo scenario and its consequence in the recently-discovered infinite-layer nickelate superconductors. We argue that the parent state is a self-doped Mott insulator and propose an effective $t$-$J$-$K$ model to account for its low-energy properties. At small doping, the model describes a low carrier density Kondo system with incoherent Kondo scattering at finite temperatures, in good agreement with experimental observation of the logarithmic temperature dependence of electric resistivity. Upon increasing Sr doping, the model predicts a breakdown of the Kondo effect, which provides a potential explanation of the non-Fermi liquid behavior of the electric resistivity with a power law scaling over a wide range of the temperature. Unconventional superconductivity is shown to undergo a transition from nodeless $(d+is)$-wave to nodal $d$-wave near the critical doping due to competition of the Kondo and Heisenberg superexchange interactions. The presence of different pairing symmetry may be supported by recent tunneling measurements.
description: 8 pages, 6 figures
Amplitude death in coupled replicator map lattice: averting migration dilemma
Creators: name: Sadhukhan, Shubhadeep
name: Chattopadhyay, Rohitashwa
name: Chakraborty, Sagar
Publisher: name: arXiv
Year: 2021
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Chaotic Dynamics (nlin.CD)
subject: Populations and Evolution (q-bio.PE)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: Populations composed of a collection of subpopulations (demes) with random migration between them are quite common occurrences. The emergence and sustenance of cooperation in such a population is a highly researched topic in the evolutionary game theory. If the individuals in every deme are considered to be either cooperators or defectors, the migration dilemma can be envisaged: The cooperators would not want to migrate to a defector-rich deme as they fear of facing exploitation; but without migration, cooperation can not be established throughout the network of demes. With a view to studying the aforementioned scenario, in this paper, we set up a theoretical model consisting of a coupled map lattice of replicator maps based on two-player--two-strategy games. The replicator map considered is capable of showing a variety of evolutionary outcomes, like convergent (fixed point) outcomes and nonconvergent (periodic and chaotic) outcomes. Furthermore, this coupled network of the replicator maps undergoes the phenomenon of amplitude death leading to non-oscillatory stable synchronized states. We specifically explore the effect of (i) the nature of coupling that models migration between the maps, (ii) the heterogenous demes (in the sense that not all the demes have same game being played by the individuals), (iii) the degree of the network, and (iv) the cost associated with the migration. In the course of investigation, we are intrigued by the effectiveness of the random migration in sustaining a uniform cooperator fraction across a population irrespective of the details of the replicator dynamics and the interaction among the demes.
Blockchain-based Result Verification for Computation Offloading
Creators: name: Körbel, Benjamin
name: Sigwart, Marten
name: Frauenthaler, Philip
name: Sober, Michael
name: Schulte, Stefan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: Offloading of computation, e.g., to the cloud, is today a major task in distributed systems. Usually, consumers which apply offloading have to trust that a particular functionality offered by a service provider is delivering correct results. While redundancy (i.e., offloading a task to more than one service provider) or (partial) reprocessing help to identify correct results, they also lead to significantly higher cost. Hence, within this paper, we present an approach to verify the results of offchain computations via the blockchain. For this, we apply zero-knowledge proofs to provide evidence that results are correct. Using our approach, it is possible to establish trust between a service consumer and arbitrary service providers. We evaluate our approach using a very well-known example task, i.e., the Traveling Salesman Problem.
Generalized relation between pulsed and continuous measurements in the quantum Zeno effect
Creators: name: Muga, J. G.
name: Echanobe, J.
name: del Campo, A.
name: Lizuain, I.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A relation is found between pulsed measurements of the excited state probability of a two-level atom illuminated by a driving laser, and a continuous measurement by a second laser coupling the excited state to a third state which decays rapidly and irreversibly. We find the time between pulses to achieve the same average detection time than a given continuous measurement in strong, weak, or intermediate coupling regimes, generalizing the results in L. S. Schulman, Phys. Rev. A 57, 1509 (1998).
description: 5 pages, 6 figures
Gravastars in a Non-minimally Coupled Gravity with Electromagnetism
Creators: name: Sert, Özcan
name: Adak, Muzaffer
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper we investigate the gravitational vacuum stars which called gravastars in the non-minimally coupled models with electromagnetic and gravitational fields. We consider two non-minimal models and find the corresponding spherically symmetric exact solutions in the interior of the star consisting of the dark energy condensate. Our models turn out to be Einstein-Maxwell model at the outside of the star and the solutions become the Reissner-Nordstr{ö}m solution. The physical quantities of these models are continuous and non-singular in some range of parameters and the exterior geometry continuously matches with the interior geometry at the surface. We calculate the matter mass, the total gravitational mass, the electric charge and redshift of the star for the two models. We notice that these quantities except redshift are dependent of a subtle free parameter, $k$, of the model. We also remark a wide redshift range from zero to infinity depending on one free parameter, $β$, in the second model.
description: 16 pages
Amtliche Mitteilungen der Technischen Universität Dortmund Nr. 10/2019
Creators: name: (:Unkn) Unknown
Publisher: name: Technische Universität Dortmund
Year: 2019
Subjects: subject: 080

description: Prüfungsordnung für den Masterstudiengang Philosophie und Politikwissenschaft der Fakultät Humanwissenschaften und Theologie an der Technischen Universität Dortmund vom 10. Mai 2019
description: Prüfungsordnung für den Masterstudiengang Religion und Politik der Fakultät Humanwissenschaften und Theologie an der Technischen Universität Dortmund vom 10. Mai 2019
description: Amtliche Mitteilungen der Technischen Universität Dortmund;2019,10
ZZ boundary states and fragmented AdS2 spaces
Creators: name: Giombi, Simone
name: Yin, Xi
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper we show that Liouville gravity on the strip with Zamolodchikov-Zamolodchikov (ZZ) boundary conditions has a semi-classical interpretation in terms of fragmented AdS2 spacetime geometries. Further, we study the three-point functions of the ZZ boundary states, and show that they are dominated by multi-AdS2 instantons in the classical limit.
description: 27 pages, 14 figures; minor changes, references added
Imaging the dipole scattering of an optically levitated dielectric nanoparticle
Creators: name: Jin, Yuanbin
name: Yan, Jiangwei
name: Rahman, Shah Jee
name: Yu, Xudong
name: Zhang, Jing
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We experimentally observe the dipole scattering of a nanoparticle using a high numerical aperture (NA) imaging system. The optically levitated nanoparticle provides an environment free of particle-substrate interaction. We illuminate the silica nanoparticle in vacuum with a 532 nm laser beam orthogonally to the propagation direction of the 1064 nm trapping laser beam strongly focused by the same high NA objective used to collect the scattering, which results in a dark background and high signal-noise ratio. The dipole orientations of the nanoparticle induced by the linear polarization of the incident laser are studied by measuring the scattering light distribution in the image and the Fourier space (k-space) as we rotate the illuminating light polarization. The polarization vortex (vector beam) is observed for the special case, when the dipole orientation of the nanoparticle is aligned along the optical axis of the microscope objective. Our work offers an important platform for studying the scattering anisotropy with Kerker conditions.
The Transparency of Galaxy Clusters
Creators: name: Bovy, Jo
name: Hogg, David W.
name: Moustakas, John
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: If galaxy clusters contain intracluster dust, the spectra of galaxies lying behind clusters should show attenuation by dust absorption. We compare the optical (3500 - 7200 Å) spectra of 60,267 luminous, early-type galaxies selected from the Sloan Digital Sky Survey to search for the signatures of intracluster dust in z ~ 0.05 clusters. We select massive, quiescent (i.e., non-star-forming) galaxies using an EW(Halpha) <= 2 Åcut and consider galaxies in three bins of velocity dispersion, ranging from 150 to 300 km s^{-1}. The uniformity of early-type galaxy spectra in the optical allows us to construct inverse-variance-weighted composite spectra with high signal-to-noise ratio (ranging from 10^2-10^3). We compare the composite spectra of galaxies that lie behind and adjacent to galaxy clusters and find no convincing evidence of dust attenuation on scales ~ 0.15-2 Mpc; we derive a generic limit of E(B-V) < 3 x 10^{-3} mag on scales ~ 1-2 Mpc at the 99% confidence level, using conservative jackknife error bars, corresponding to a dust mass
description: 9 pages, 6 figures. ApJ in press
Magnetism from $2p$ States in Alkaline Earth Monoxides: Trends with Varying N Impurity Concentration
Creators: name: Pardo, V.
name: Pickett, W. E.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: $2p$-based magnetic moments and magnetic coupling are studied with density functional based methods for substitutional N in the alkaline earth monoxide series MgO, CaO, SrO, BaO. The hole is rather strongly localized near the N$^{2-}$ ion, being somewhat more so when strong on-site interactions are included in the calculations. Strong magnetic coupling is obtained in the itinerant electron limit but decreases strongly in the localized limit in which the Coulomb repulsion within the N $2p$ shell (U) is much greater than the N $2p$ impurity bandwidth (W). We find that this limit is appropriate for realistic N concentrations. Ordering on a simple cubic sublattice may maximize the magnetic coupling due to its high directionality.
description: 6 pages, 4 figures, 3 tables
M2 to D2 revisited
Creators: name: Ho, Pei-Ming
name: Imamura, Yosuke
name: Matsuo, Yutaka
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present two derivations of the multiple D2 action from the multiple M2-brane model proposed by Bagger-Lambert and Gustavsson. The first one is to start from Lie 3-algebra associated with given (arbitrary) Lie algebra. The Lie 3-algebra metric is not positive definite but the zero-norm generators merely correspond to Lagrange multipliers. Following the work of Mukhi and Papageorgakis, we derive D2-brane action from the model by giving a variable a vacuum expectation value. The second derivation is based on the correspondence between M2 and M5. We compactify one dimension and wind M5 brane along this direction. This leads to a noncommutative D4 action. Multiple D2 action is then obtained by suitably choosing the non-commutative parameter on the two-torus. It also implies a natural interpretation to the extra generator in Lie 3-algebra, namely the winding of M5 world volume around $S^1$ which defines the reduction of M theory to \IIA superstring.
description: 20 pages, minor modifications, references added
Spectroscopy of globular clusters in the low-luminosity spiral galaxy NGC 45
Creators: name: Mora, Marcelo D.
name: Larsen, Soeren S.
name: Kissler-Patig, Markus
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: CONTEXT: Extragalactic globular clusters have been studied in elliptical galaxies and in a few luminous spiral galaxies, but little is known about globular clusters in low-luminosity spirals. AIMS: Past observations with the ACS have shown that NGC 45 hosts a large population of globular clusters (19), as well as several young star clusters. In this work we aim to confirm the bona fide globular cluster status for 8 of 19 globular cluster candidates and to derive metallicities, ages, and velocities. METHODS: VLT/FORS2 multislit spectroscopy in combination with the Lick/IDS system was used to derive velocities and to constrain metallicities and [alpha/Fe] element ratio of the globular clusters. RESULTS: We confirm the 8 globular clusters as bona fide globular clusters. Their velocities indicate halo or bulge-like kinematics, with little or no overall rotation. From absorption indices such as H_beta, H_gamma, and H_delta and the combined [MgFe]' index, we found that the globular clusters are metal-poor [Z/H]<=-0.33 dex and [alpha/Fe]<=0.0 element ratio. These results argue in favor of a population of globular clusters formed during the assembling of the galaxy.
description: Accepted for publication in Astronomy and Astrophysics. 10 pages, 6 figures. Table 6 and Fig. 6 will only be published in the electronic edition of the A&A journal
The direct detection of double quantum coherence
Creators: name: Legros, Mark Anthony
Publisher: name: University of British Columbia
Year: 2010

description: When a spin-1 nucleus is placed in a large magnetic field and an electric field gradient, the energy level diagram for the states describing it's orientation consist of three unequally spaced levels. If the hamiltonian (which is the sum of a Zeeman term and a quadrupolar term) is truncated to include only terms which commute with the Zeeman term, magnetic dipole transitions between levels with m=1 have finite transition probabilities. When the nonsecular terms, those which do not commute with lz, are taken into account another magnetic dipole transition can occur; a transition in which m=2. The theory and experimental techniques associated with the observation of m=2 transitions is presented. The intention is to provide insights and examples of when the spectroscopy of such transitions is a valuable procedure. The results show that the spectroscopy of this forbidden transition is practical for spin-1 nuclei in systems with large (>500Khz) quadrupole splittings, and long spin-spin relaxation times. The information available by doing the m=2 experiments is obtainable from other resonance techniques and the major feature which prevents the experiments from being relegated to the catagory of a "Scientific curiosity" is their simplicity.
Averaging procedure in variable-G cosmologies
Creators: name: Cardone, Vincenzo F.
name: Esposito, Giampiero
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Previous work in the literature had built a formalism for spatially averaged equations for the scale factor, giving rise to an averaged Raychaudhuri equation and averaged Hamiltonian constraint, which involve a backreaction source term. The present paper extends these equations to include models with variable Newton parameter and variable cosmological term, motivated by the nonperturbative renormalization program for quantum gravity based upon the Einstein-Hilbert action. We focus on the Brans-Dicke form of the renormalization-group improved action functional. The coupling between backreaction and spatially averaged three-dimensional scalar curvature is found to survive, and a variable-G cosmic quintet is found to emerge. Interestingly, under suitable assumptions, an approximate solution can be found where the early universe tends to a FLRW model, while keeping track of the original inhomogeneities through three effective fluids. The resulting qualitative picture is that of a universe consisting of baryons only, while inhomogeneities average out to give rise to the full dark-side phenomenology.
description: 20 pages. In the new version, all original calculations have been improved, and the presentation has been further improved as well
The simulated 21 cm signal during the epoch of reionization : full modeling of the Ly-alpha pumping
Creators: name: Baek, S.
name: Di Matteo, P.
name: Semelin, B.
name: Combes, F.
name: Revaz, Y.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The 21 cm emission of neutral hydrogen is the most promising probe of the epoch of reionization(EoR). In the next few years, the SKA pathfinders will provide statistical measurements of this signal. Numerical simulations predicting these observations are necessary to optimize the design of the instruments. The main difficulty is the computation of the spin temperature of neutral hydrogen which depends on the gas kinetic temperature and on the level of the local Lyman-alpha flux. A T_s >> T_cmb assumption is usual. However, this assumption does not apply early in the reionization history, or even later in the history as long as the sources of X-rays are too weak to heat the intergalactic medium significantly. This work presents the first EoR numerical simulations including, beside dynamics and ionizing continuum radiative transfer, a self-consistent treatment of the Ly-alpha radiative transfer. This allows us to compute the spin temperature more accurately. We use two different box sizes, 20 Mpc/h and 100 Mpc/h, and a star source model. Using the redshift dependence of average quantities, maps, and power spectra, we quantify the effect of using different assumptions to compute the spin temperature and the influence of the box size. The first effect comes from allowing for a signal in absorption. The magnitude of this effect depends on the amount of heating by hydrodynamic shocks and X-rays in the intergalactic medium(IGM). The second effects comes from using the real, local, Lyman-alpha flux. This effect is important for an average ionization fraction of less than 10%: it changes the overall amplitude of the 21 cm signal, and adds its own fluctuations to the power spectrum.
description: 20 pages, 16 figures, 2 tables, To be publish A&A. High resolution version available at http://aramis.obspm.fr/~baek/21cm_Lya.pdf
Centrality dependence of the thermal excitation-energy deposition in 8-15 GeV/c hadron-Au reactions
Creators: name: Soltz, R. A.
name: Newby, R. J.
name: Klay, J. L.
name: Heffner, M.
name: Beaulieu, L.
name: Lefort, T.
name: Kwiatkowski, K.
name: Viola, V. E.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The excitation energy per residue nucleon (E*/A) and fast and thermal light particle multiplicities are studied as a function of centrality defined as the number of grey tracks emitted N_grey and by the mean number of primary hadron-nucleon scatterings and mean impact parameter  extracted from it. The value of E*/A and the multiplicities show an increase with centrality for all systems, 14.6 GeV p-Au and 8.0 GeV pi-Au and pbar-Au collisions, and the excitation energy per residue nucleon exhibits a uniform dependence on N_grey.
description: 7 pages, 6 figures
A New FUSE Survey of Interstellar HD
Creators: name: Snow, Theodore P.
name: Ross, Teresa L.
name: Destree, Joshua D.
name: Drosback, Meredith M.
name: Jensen, Adam G.
name: Rachford, Brian L.
name: Sonnentrucker, Paule
name: Ferlet, Roger
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have used archival FUSE data to complete a survey of interstellar HD in 41 lines of sight with a wide range of extinctions. This follow up to an earlier survey was made to further assess the utility of HD as a cosmological probe; to analyze the HD formation process; and to see what trends with other interstellar properties were present in the data. We employed the curve-of-growth method, supported by line profile fitting, to derive accurate column densities of HD. We find that the N(HD)/2N(H2) ratio is substantially lower than the atomic D/H ratio and conclude that the molecular ratio has no bearing on cosmology, because local processes are responsible for the formation of HD. Based on correlations with E(B-V), H2, CO, and iron depletion, we find that HD is formed in the densest portion of the clouds; the slope of the logN(HD)/log(H2) correlation is greater than 1.0, caused by the destruction rate of HD declining more slowly than that of H2; and, as a sidelight, that the depletions are density dependent.
description: 30 pages, 13 figures; Accepted for publication in ApJ