cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Ultra-High Energy Cosmic Rays Detected by the Pierre Auger Observatory: First Direct Evidence, and its Implications, that a Subset Originate in Nearby Radiogalaxies
Creators: name: Nagar, Neil M.
name: Matulich, Javier
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: (abridged) The Pierre Auger Collaboration has reported 27 Ultra-High Energy Cosmic Ray Events (UHECRs) with energies above 56 EeV and well determined arrival directions as of 2007 August 31. They find that the arrival directions are not isotropic, but instead appear correlated with the positions of nearby AGNs. Our aim was to determine the sources of these UHECRs by comparing their arrival directions with more comprehensive source catalogs. Four (eight) of the 27 UHECRs with energy >56EeV detected by the Pierre Auger Observatory have arrival directions within 1.5deg (3.5deg) of the extended (>180kpc) radio structures of nearby radiogalaxies or the single nearby BLLac with extended radio structure. Conversely the radio structures of three (six) of all ten nearest extended radiogalaxies are within 1.5deg (3.5deg) of a UHECR; three of the remaining four radiogalaxies are in directions with lower exposure times. This correlation between nearby extended radiogalaxies and a subset of UHECRs is significant at the 99.9% level. This is the first direct observational proof that radio galaxies are a significant source of UHECRs. For the remaining ~20 UHECRs, an isotropic distribution cannot be ruled out at high significance. The correlation found by the Auger Collaboration between the 27 UHECRs and AGNs in the Veron-Cetty & Veron catalog at D < 71Mpc has a much lower significance when one considers only the ~20 UHECRs not `matched' to nearby extended radiogalaxies. No correlation is seen between UHECRs and supernovae, supernova remnants, nearby galaxies, or nearby groups and clusters of galaxies. The primary difference between the UHECR detections at the Pierre Auger Observatory and previous experiments may thus be that the Southern Hemisphere is more privileged with respect to nearby extended radiogalaxies.
description: 10 pages total. To appear in A&A
[Halle (Saale), Universitäts- und Landesbibliothek Sachsen-Anhalt, Morbio 5 (197)]
Creators: name: Agnexina
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 1387
Subjects: subject: Sonstige weltliche Aussteller
subject: Inventar
subject: Notarsurkunde
subject: Urkunde
subject: 090

description: Agnexina, Witwe des Bencius de Ferariis aus Recorfano, seinerseits Sohn des verstorbenen Andriolus de Ferariis, ebenfalls aus Recorfano, einst wohnhaft in der Nachbarschaft von St. Nazarii in Cremona, und Vormund des Antonius, des Andriolus und der Malgarita, Kinder des Bencius, fertigt für ihre Mündel ein Inventar der Güter des Verstorbenen an.
Cylindrical Two-Dimensional Electron Gas in a Transverse Magnetic Field
Creators: name: Ferrari, Giulio
name: Bertoni, Andrea
name: Goldoni, Guido
name: Molinari, Elisa
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We compute the single-particle states of a two-dimensional electron gas confined to the surface of a cylinder immersed in a magnetic field. The envelope-function equation has been solved exactly for both an homogeneous and a periodically modulated magnetic field perpendicular to the cylinder axis. The nature and energy dispersion of the quantum states reflects the interplay between different lengthscales, namely, the cylinder diameter, the magnetic length, and, possibly, the wavelength of the field modulation. We show that a transverse homogeneous magnetic field drives carrier states from a quasi-2D (cylindrical) regime to a quasi-1D regime where carriers form channels along the cylinder surface. Furthermore, a magnetic field which is periodically modulated along the cylinder axis may confine the carriers to tunnel-coupled stripes, rings or dots on the cylinder surface, depending on the ratio between the the field periodicity and the cylinder radius. Results in different regimes are traced to either incipient Landau levels formation or Aharonov-Bohm behaviour.
description: 23 pages, 14 figures
Witnessing Subsystems for Probabilistic Systems with Low Tree Width
Creators: name: Jantsch, Simon
name: Piribauer, Jakob
name: Baier, Christel
Publisher: name: arXiv
Year: 2021
Subjects: subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences

description: A standard way of justifying that a certain probabilistic property holds in a system is to provide a witnessing subsystem (also called critical subsystem) for the property. Computing minimal witnessing subsystems is NP-hard already for acyclic Markov chains, but can be done in polynomial time for Markov chains whose underlying graph is a tree. This paper considers the problem for probabilistic systems that are similar to trees or paths. It introduces the parameters directed tree-partition width (dtpw) and directed path-partition width (dppw) and shows that computing minimal witnesses remains NP-hard for Markov chains with bounded dppw (and hence also for Markov chains with bounded dtpw). By observing that graphs of bounded dtpw have bounded width with respect to all known tree similarity measures for directed graphs, the hardness result carries over to these other tree similarity measures. Technically, the reduction proceeds via the conceptually simpler matrix-pair chain problem, which is introduced and shown to be NP-complete for nonnegative matrices of fixed dimension. Furthermore, an algorithm which aims to utilise a given directed tree partition of the system to compute a minimal witnessing subsystem is described. It enumerates partial subsystems for the blocks of the partition along the tree order, and keeps only necessary ones. A preliminary experimental analysis shows that it outperforms other approaches on certain benchmarks which have directed tree partitions of small width.
description: In Proceedings GandALF 2021, arXiv:2109.07798. A full version of this paper, containing all proofs, appears at arXiv:2108.08070
Dynamics of rotating spin-orbit-coupled Bose-Einstein condensates in a quasicrystalline optical lattice
Creators: name: Wang, Qingbo
name: Hu, Jinguo
name: Su, Xianghua
name: Wen, Linghua
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We investigate the dynamics of rotating pseudo-spin-1/2 Bose-Einstein condensates (BECs) with Rashba spin-orbit coupling (SOC) in a quasicrystalline optical lattice (QOL). For given parameters, the system evolves from an initial heliciform-stripe phase into a final visible vortex necklace with a giant vortex and a hidden vortex necklace. Simultaneously, the corresponding spin texture undergoes a transition from a meron-antimeron pair to a half-antiskyrmion necklace. During the dynamic evolution process, the angular momentum increases gradually, and then approaches to a convergent value. Furthermore, typical quantum phases of rotating two-component BECs with SOC in different external potentials are summarized.
description: 3 pages, 3 figures
Sparse Regularization with $l^q$ Penalty Term
Creators: name: Grasmair, Markus
name: Haltmeier, Markus
name: Scherzer, Otmar
Publisher: name: arXiv
Year: 2008
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 65J20; 65J22; 49N45

description: We consider the stable approximation of sparse solutions to non-linear operator equations by means of Tikhonov regularization with a subquadratic penalty term. Imposing certain assumptions, which for a linear operator are equivalent to the standard range condition, we derive the usual convergence rate $O(\sqrtδ)$ of the regularized solutions in dependence of the noise level $δ$. Particular emphasis lies on the case, where the true solution is known to have a sparse representation in a given basis. In this case, if the differential of the operator satisfies a certain injectivity condition, we can show that the actual convergence rate improves up to $O(δ)$.
description: 15 pages
Semiring Provenance for Büchi Games: Strategy Analysis with Absorptive Polynomials
Creators: name: Grädel, Erich
name: Lücking, Niels
name: Naaf, Matthias
Publisher: name: arXiv
Year: 2021
Subjects: subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences

description: This paper presents a case study for the application of semiring semantics for fixed-point formulae to the analysis of strategies in Büchi games. Semiring semantics generalizes the classical Boolean semantics by permitting multiple truth values from certain semirings. Evaluating the fixed-point formula that defines the winning region in a given game in an appropriate semiring of polynomials provides not only the Boolean information on who wins, but also tells us how they win and which strategies they might use. This is well-understood for reachability games, where the winning region is definable as a least fixed point. The case of Bchi games is of special interest, not only due to their practical importance, but also because it is the simplest case where the fixed-point definition involves a genuine alternation of a greatest and a least fixed point. We show that, in a precise sense, semiring semantics provide information about all absorption-dominant strategies - strategies that win with minimal effort, and we discuss how these relate to positional and the more general persistent strategies. This information enables applications such as game synthesis or determining minimal modifications to the game needed to change its outcome.
description: In Proceedings GandALF 2021, arXiv:2109.07798. A full version of this paper, containing all proofs, appears at arXiv:2106.12892
Dynamics of kicked spin-orbit-coupled Bose-Einstein condensates
Creators: name: Wang, Qingbo
name: Zhao, Wenjing
name: Wen, Linghua
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We investigate the dynamics of kicked pseudo-spin-1/2 Bose-Einstein condensates (BECs) with spin-orbit coupling (SOC) in a tightly confined toroidal trap. The system exhibits different dynamical behaviors depending on the competition among SOC, kick strength, kick period and interatomic interaction. For weak kick strength, with the increase of SOC the density profiles of two components evolve from overlapped symmetric distributions into staggered antisymmetric distributions, and the evolution of energy experiences a transition from quasiperiodic motion to modulated quantum beating. For large kick strength, when the SOC strength increases, the overlapped symmetric density distributions become staggered irregular patterns, and the energy evolution undergoes a transition from quasiperiodic motion to dynamical localization. Furthermore, in the case of weak SOC, the increase of kick period leads to a transition of the system from quantum beating to Rabi oscillation, while for the case of strong SOC the system demonstrates complex quasiperiodic motion.
description: 3 pages, 3 figures
Unparticles and electroweak symmetry breaking
Creators: name: Lee, Jong-Phil
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate a scalar potential inspired by the unparticle sector for the electroweak symmetry breaking. The scalar potential contains the interaction between the standard model fields and unparticle sector. It is described by the non-integral power of fields that originates from the nontrivial scaling dimension of the unparticle operator. It is found that the electroweak symmetry is broken at tree level when the interaction is turned on. The scale invariance of unparticle sector is also broken simultaneously, resulting in a physical Higgs and a new lighter scalar particle.
description: 3 pages, 1 figure. Proceedings of SUSY08, Seoul, Korea
Casimir interaction of dielectric gratings
Creators: name: Lambrecht, Astrid
name: Marachevsky, Valery N.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We derive an exact solution for the Casimir force between two arbitrary periodic dielectric gratings and illustrate our method by applying it to two nanostructured silicon gratings. We also reproduce the Casimir force gradient measured recently [1] between a silicon grating and a gold sphere taking into account the material dependence of the force. We find good agreement between our theoretical results and the measured values both in absolute force values and the ratios between the exact force and PFA predictions.
description: 4 pages, 4 figures, revtex4
Perturbation Theory of Neutrino Oscillation with Nonstandard Neutrino Interactions
Creators: name: Kikuchi, Takashi
name: Minakata, Hisakazu
name: Uchinami, Shoichi
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We discuss various physics aspects of neutrino oscillation with non-standard interactions (NSI). We formulate a perturbative framework by taking Δm^2_{21} / Δm^2_{31}, s_{13}, and the NSI elements ε_{αβ} (α, β= e, μ, τ) as small expansion parameters of the same order ε. Within the εperturbation theory we obtain the S matrix elements and the neutrino oscillation probability formula to second order (third order in ν_e related channels) in ε. The formula allows us to estimate size of the contribution of any particular NSI element ε_{αbeta} to the oscillation probability in arbitrary channels, and gives a global bird-eye view of the neutrino oscillation phenomena with NSI. Based on the second-order formula we discuss how all the conventional lepton mixing as well as NSI parameters can be determined. Our results shows that while θ_{13}, δ, and the NSI elements in ν_e sector can in principle be determined, complete measurement of the NSI parameters in the ν_μ- ν_τsector is not possible by the rate only analysis. The discussion for parameter determination and the analysis based on the matter perturbation theory indicate that the parameter degeneracy prevails with the NSI parameters. In addition, a new solar-atmospheric variable exchange degeneracy is found. Some general properties of neutrino oscillation with and without NSI are also illuminated.
description: manuscript restructured, discussion of new type of parameter degeneracy added. 47 pages
Stellar populations with MEGARA: the inner regions of NGC 7025
Creators: name: Chamorro-Cazorla, M.
name: de Paz, A. Gil
name: Castillo-Morales, A.
name: Dullo, B. T.
name: Gallego, J.
name: Carrasco, E.
name: Iglesias-Páramo, J.
name: Cedazo, R.
name: García-Vargas, M. L.
name: Pascual, S.
name: Cardiel, N.
name: Pérez-Calpena, A.
name: Gómez-Álvarez, P.
name: Martínez-Delgado, I.
name: Catalán-Torrecilla, C.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Context. We aim to determine the capabilities of the MEGARA@GTC instrument integral-field unit to study stellar populations and exploit its combination of high spectral (R \sim 6,000, 12,000 and 20,000) and spatial (0.62") resolutions within its 12.5"x11.3" field of view. Aims. We pursue to establish a systematic method through which we can determine the properties of the stellar populations in the observations made with MEGARA, more specifically within the MEGADES legacy project and, for this paper, those of the stellar populations of NGC 7025. Methods. We use MEGARA observations of galaxy NGC 7025. We apply different approaches to estimate the properties of the stellar populations with the highest possible certainty. Numerous tests were also performed to check the reliability of the study. Results. All the studies we conduct (both full spectral fitting and absorption line indices) on the stellar populations of NGC 7025 indicate that the stars that form its bulge have supersolar metallicity and considerably old ages (\sim 10 Gyr), in general. We determined that the bulge of NGC 7025 has a mild negative mass-weighted age gradient using three different combinations of MEGARA spectral setups. Regarding its more detailed star formation history, our results indicate that, besides a rather constant star formation at early epochs, a peak in formation history of the stars in the bulge is also found 3.5-4.5 Gyr ago, partly explaining the mass-weighted age gradients measured. Conclusions. The scenario presented in NGC 7025 is that of an isolated galaxy under secular evolution that about 3.5-4.5 Gyr ago likely experimented a minor merger (mass ratio 1/10) that induced an increase in star formation and also perturbed the morphology of its outer disc. We report on different lessons learned for the ongoing exploitation of the MEGADES survey with GTC.
description: Accepted for publication in Astronomy & Astrophysics
Linear Covariant Gauges on the Lattice
Creators: name: Cucchieri, Attilio
name: Maas, Axel
name: Mendes, Tereza
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: Linear covariant gauges, such as Feynman gauge, are very useful in perturbative calculations. Their nonperturbative formulation is, however, highly non-trivial. In particular, it is a challenge to define linear covariant gauges on a lattice. We consider a class of gauges in lattice gauge theory that coincides with the perturbative definition of linear covariant gauges in the formal continuum limit. The corresponding gauge-fixing procedure is described and analyzed in detail, with an application to the pure SU(2) case. In addition, results for the gluon propagator in the two-dimensional case are given.
description: 21 pages, 6 figures, 5 tables; added comments and minor changes, 1 figure added, 1 modified
Aligning VLBI Images of Active Galactic Nuclei at Different Frequencies
Creators: name: Croke, S. M.
name: Gabuzda, D. C.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Many important techniques for investigating the properties of extragalactic radio sources, such as spectral-index and rotation-measure mapping, involve the comparison of images at two or more frequencies. In the case of radio interferometric data, this can be done by comparing the CLEAN maps obtained at the different frequencies. However, intrinsic differences in images due to the frequency dependence of the radio emission can be distorted by additional differences that arise due to source variability (if the data to be compared is obtained at different times), image misalignment, and the frequency dependence of the sensitivity to weak emission and the angular resolution provided by the observations (the resolution of an interferometer depends on the lengths of its baselines in units of the observing wavelength). These effects must be corrected for as best as possible before multi-frequency data comparison techniques can be applied. We consider the origins for the afore-mentioned factors, outline the standard techniques used to overcome these difficulties, and describe in detail a technique developed by us, based on the cross-correlation technique widely used in other fields, to correct for misalignments between maps at different frequencies.
description: Published in MNRAS (2008)
Certifying DFA Bounds for Recognition and Separation
Creators: name: Kupferman, Orna
name: Lavee, Nir
name: Sickert, Salomon
Publisher: name: arXiv
Year: 2021
Subjects: subject: Formal Languages and Automata Theory (cs.FL)
subject: FOS: Computer and information sciences

description: The automation of decision procedures makes certification essential. We suggest to use determinacy of turn-based two-player games with regular winning conditions in order to generate certificates for the number of states that a deterministic finite automaton (DFA) needs in order to recognize a given language. Given a language $L$ and a bound $k$, recognizability of $L$ by a DFA with $k$ states is reduced to a game between Prover and Refuter. The interaction along the game then serves as a certificate. Certificates generated by Prover are minimal DFAs. Certificates generated by Refuter are faulty attempts to define the required DFA. We compare the length of offline certificates, which are generated with no interaction between Prover and Refuter, and online certificates, which are based on such an interaction, and are thus shorter. We show that our approach is useful also for certification of separability of regular languages by a DFA of a given size. Unlike DFA minimization, which can be solved in polynomial time, separation is NP-complete, and thus the certification approach is essential. In addition, we prove NP-completeness of a strict version of separation.
description: This is the full version of an article with the same title that appears in the ATVA 2021 conference proceedings. The final authenticated publication is available online at https://doi.org/[not-yet-existing-DOI]
Semi-classical Analysis of Spin Systems near Critical Energies
Creators: name: Ribeiro, Pedro
name: Paul, Thierry
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The spectral properties of $su(2)$ Hamiltonians are studied for energies near the critical classical energy $ε_c$ for which the corresponding classical dynamics presents hyperbolic points (HP). A general method leading to an algebraic relation for eigenvalues in the vicinity of $ε_c$ is obtained in the thermodynamic limit, when the semi-classical parameter $n^{-1}=(2s)^{-1}$ goes to zero (where $s$ is the total spin of the system). Two applications of this method are given and compared with numerics. Matrix elements of observables, computed between states with energy near $ε_c$, are also computed and shown to be in agreement with the numerical results.
description: 3 figures
Itinerant spin excitations near the hidden order transition in URu2Si2
Creators: name: Janik, J. A.
name: Zhou, H. D.
name: Jo, Y. -J.
name: Balicas, L.
name: MacDougall, G. J.
name: Luke, G. M.
name: Garrett, J. D.
name: McClellan, K. J.
name: Bauer, E. D.
name: Sarrao, J. L.
name: Qiu, Y.
name: Copley, J. R. D.
name: Yamani, Z.
name: Buyers, W. J. L.
name: Wiebe, C. R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: By means of neutron scattering we show that the high-temperature precursor to the hidden order state of the heavy fermion superconductor URu$_{2}$Si$_{2}$ exhibits heavily damped incommensurate paramagnons whose strong energy dispersion is very similar to that of the long-lived longitudinal f-spin excitations that appear below T$_{0}$. Since the underlying local f-exchange is preserved we expect only the f-d interactions to change across the phase transition and to cause the paramagnetic damping. The damping exhibits single-ion behavior independent of wave vector and vanishes below the hidden order transition. We suggest that this arises from a transition from valence fluctuations to a hybridized f-d state below T$_{0}$. Here we present evidence that the itinerant excitations, like those in chromium, are due to Fermi surface nesting of hole and electron pockets so that the hidden order phase likely originates from a Fermi-surface instability. We identify wave vectors that span nested regions of a band calculation and that match the neutron spin crossover from incommensurate to commensurate on approach to the hidden order phase.
description: 4 pages, 4 figures, to be submitted to PRL
Towards a Multi-Agent System Architecture for Supply Chain Management
Creators: name: Jaimez-González, Carlos R.
name: Luna-Ramírez, Wulfrano A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Multiagent Systems (cs.MA)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Individual business processes have been changing since the Internet was created, and they are now oriented towards a more distributed and collaborative business model, in an e-commerce environment that adapts itself to the competitive and changing market conditions. This paper presents a multi-agent system architecture for supply chain management, which explores different strategies and offers solutions in a distributed e-commerce environment. The system is designed to support different types of interfaces, which allow interoperating with other business models already developed. In order to show how the entire multi-agent system is being developed, the implementation of a collaborative agent is presented and explained.
description: 2 figures, 2 snippets
The Precision Determination of Invisible-Particle Masses at the LHC
Creators: name: Barr, Alan J.
name: Ross, Graham G.
name: Serna, Mario
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We develop techniques to determine the mass scale of invisible particles pair-produced at hadron colliders. We employ the constrained mass variable m_2C, which provides an event-by-event lower-bound to the mass scale given a mass difference. We complement this variable with a new variable m_2C,UB which provides an additional upper bound to the mass scale, and demonstrate its utility with a realistic case study of a supersymmetry model. These variables together effectively quantify the `kink' in the function Max m_T2 which has been proposed as a mass-determination technique for collider-produced dark matter. An important advantage of the m_2C method is that it does not rely simply on the position at the endpoint, but it uses the additional information contained in events which lie far from the endpoint. We found the mass by comparing the HERWIG generated m_2C distribution to ideal distributions for different masses. We find that for the case studied, with 100 fb^-1 of integrated luminosity (about 400 signal events), the invisible particle's mass can be measured to a precision of 4.1 GeV. We conclude that this technique's precision and accuracy is as good as, if not better than, the best known techniques for invisible-particle mass-determination at hadron colliders.
description: 20 pages, 11 figures, minor corrections
Superconducting insulators and localization of Cooper pairs
Creators: name: Arutyunov, Konstantin Yu.
name: Lehtinen, Janne S.
name: Radkevich, Alexey
name: Semenov, Andrew G.
name: Zaikin, Andrei D.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Rapid miniaturization of electronic devices and circuits demands profound understanding of fluctuation phenomena at the nanoscale. Superconducting nanowires -- serving as important building blocks for such devices -- may seriously suffer from fluctuations which tend to destroy long-range order and suppress superconductivity. In particular, quantum phase slips (QPS) proliferating at low temperatures may turn a quasi-one-dimensional superconductor into a resistor or an insulator. Here, we introduce a physical concept of QPS-controlled localization of Cooper pairs that may occur even in uniform nanowires without any dielectric barriers being a fundamental manifestation of the flux-charge duality in superconductors. We demonstrate -- both experimentally and theoretically -- that deep in the "insulating" state such nanowires actually exhibit non-trivial superposition of superconductivity and weak Coulomb blockade of Cooper pairs generated by quantum tunneling of magnetic fluxons across the wire.
description: 7+2 pages,5+2 figures
Flight of Ideas or Flight from Ideas? A Schelerian Contribution to the Symptomatology of “Flight of Ideas”
Creators: name: Wendt, Alexander Nicolai
Publisher: name: Thaumàzein | Rivista di Filosofia
Year: 2020
Subjects: Flight of Ideas; Thought Disorder; Psychology of Thought; Phenomenology; Phenomenological Psychopathology

description: In psychiatric symptomatology, “flight of ideas” is commonly understood as a symptom of a formal thought disorder which is typical for bipolar illnesses. Notwithstanding, there is a historical controversy that preceded this classification. Neither the nature nor the meaning of the symptom is self-explanatory. Psychology of thought, especially in the works of Hugo Liepmann and Oswald Külpe, has tried to grasp its actual complexity. Yet, they could not advance beyond the presuppositions of their own psychological paradigm. The recently proposed Schelerian psychopathology, however, may help to solve these long-lived problems. Instead of investigating thought as a monolithic phenomenon, Schelerian philosophy reveals its pre-reflective constitution. This investigation amounts to the emotional phenomenology of the ordo amoris as a structure of primordial affectivity. It plays a decisive role in the formation of the order which underlies thought and, consequently, of the disorder of “flight of ideas”.
description: Thaumàzein | Rivista di Filosofia, Vol 7 (2019): Psychopathology and Philosophy in Relation to the Existence of Human Being Part II
Quadratic pencil of difference equations: Jost solutions, spectrum, and principal vectors
Creators: name: Adivar, Murat
Publisher: name: arXiv
Year: 2008
Subjects: subject: Spectral Theory (math.SP)
subject: FOS: Mathematics
subject: 39A10, 39A12, 39A13

description: In this paper, a quadratic pencil of Schrödinger type difference operator $L_λ$ is taken under investigation to give a general perspective on the spectral analysis of non-selfadjoint difference equations of second order. Introducing Jost-type solutions, structural and quantitative properties of spectrum of the operator $L_λ$ are analyzed and hence, a discrete analog of the theory in Degasperis, (\emph{J.Math.Phys}. 11: 551--567, 1970) and Bairamov et. al, (\emph{Quaest. Math.} 26: 15--30, 2003) is developed. In addition, several analogies are established between difference and $q$-difference cases. Finally, the principal vectors of $L_λ$ are introduced to lay a groundwork for the spectral expansion. Mathematics Subject Classification (2000): 39A10, 39A12, 39A13
On the GKP Vacuum in Gauge/Gravity Correspondences
Creators: name: Piscaglia, Simone <1984>
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2014
Subjects: FIS/02 Fisica teorica, modelli e metodi matematici

description: Within the framework of the AdS5/CFT4 correspondence, the GKP string living on a  AdS5 x S5 background finds a counterpart in the anti-ferromagnetic vacuum state for the spin chain, fruitfully employed to investigate the dual N=4 SYM superconformal gauge theory. The thesis mainly deals with the excitations over such a vacuum: dispersion relations and scattering matrices are computed, moreover a set of Asymptotic Bethe Ansatz equations is formulated. Furthermore, the survey of the GKP vacuum within the AdS4/CFT3 duality between a string theory on AdS4  x CP 3 and  N=6 Chern-Simons reveals intriguing connections relating the latter to N=4 SYM, in a peculiar high spin limit.
Analyzing the performance of distributed conflict resolution among autonomous vehicles
Creators: name: de Oliveira, Ítalo Romani
Publisher: name: arXiv
Year: 2021
Subjects: subject: Multiagent Systems (cs.MA)
subject: Systems and Control (eess.SY)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: This paper presents a study on how cooperation versus non-cooperation, and centralization versus distribution impact the performance of a traffic game of autonomous vehicles. A model using a particle-based, Lagrange representation, is developed, instead of a Eulerian, flow-based one, usual in routing problems of the game-theoretical approach. This choice allows representation of phenomena such as fuel exhaustion, vehicle collision, and wave propagation. The elements necessary to represent interactions in a multi-agent transportation system are defined, including a distributed, priority-based resource allocation protocol, where resources are nodes and links in a spatial network and individual routing strategies are performed. A fuel consumption dynamics is developed in order to account for energy cost and vehicles having limited range. The analysis shows that only the scenarios with cooperative resource allocation can achieve optimal values of either collective cost or equity coefficient, corresponding respectively to the centralized and to the distributed cases.
Multicollinearity, autocorrelation, and ridge regression
Creators: name: Hsu, Jackie Jen-Chy
Publisher: name: University of British Columbia
Year: 2010

description: The presence of multicollinearity can induce large variances in the ordinary Least-squares estimates of repression coefficients. It has been shown that ridge regression can reduce this adverse effect on estimation. The presence of serially correlated error terms can also cause serious estimation problems. Various two-stage methods, have been proposed to obtain good estimates of the regression coefficients in this case. Although the multicollinearity and autocorrelation problems have long been recognized in regression analysis, they are usually dealt with separately. This thesis explores the joint effects of these two conditions on the mean square error properties of the ordinary ridge estimator as well as the ordinary least-squares estimator. We show that ridge regression is doubly advantageous when multicollinearity is accompanied by autocorrelation in both,the errors and the principal components. We then derive a new ridge type estimator that is adjusted for autocorrelation. Finally, using simulation experiments with different degrees of multicollinearity and autocorrelation, we compare the mean square error properties of various estimators.
Minimal supergravity sneutrino dark matter and inverse seesaw neutrino masses
Creators: name: Arina, C.
name: Bazzocchi, F.
name: Fornengo, N.
name: Romao, J. C.
name: Valle, J. W. F.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We show that within the inverse seesaw mechanism for generating neutrino masses minimal supergravity is more likely to have a sneutrino as the lightest superparticle than the conventional neutralino. We also demonstrate that such schemes naturally reconcile the small neutrino masses with the correct relic sneutrino dark matter abundance and accessible direct detection rates in nuclear recoil experiments.
description: 4 pages, 4 figures
Proof theory of quantified modal logics
Creators: name: Orlandelli, Eugenio <1981>
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2014
Subjects: M-FIL/02 Logica e filosofia della scienza

description: We introduce labelled sequent calculi for indexed modal logics. We prove that the structural rules of weakening and contraction are height-preserving admissible, that all rules are invertible, and that cut is admissible. Then we prove that each calculus introduced is sound and complete with respect to the appropriate class of transition frames.
Non-magnetic simplified cylindrical cloak with suppressed zero-th order scattering
Creators: name: Yan, Wei
name: Yan, Min
name: Qiu, Min
Publisher: name: arXiv
Year: 2008
Subjects: subject: Optics (physics.optics)
subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: A new type of simplified cloaks with matched exterior boundaries is proposed. The cloak uses non-magnetic material for the TM polarization and can function with a relatively thin thickness. It is shown that the $zero^{th}$ order scattering of such cloak is dominant among all cylindrical scattering terms. A gap is added at the cloak's inner surface to eliminate the zero-th order scattering, through the mechanism of scattering resonance. The reduction in scattering is relatively smooth, indicating that the proposed scattering reduction method has good tolerance to perturbations. Numerical simulations also confirm that the proposed structure has very low scattering.
description: 11 pages, 4 figures
Development of a large area gas photomultiplier with GEM/$μ$PIC
Creators: name: Sekiya, H.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We are developing a new photon detector with micro pattern gaseous detectors. A semitransparent CsI photocathode is combined with 10cm$\times$10cm GEM/$μ$PIC for the first prototype which is aimed for the large liquid Xe detectors. Using Ar+C$_2$H$_6$ (10%) gas, we achieved the gas gain of $10^5$ which is enough to detect single photoelectron. We, then, irradiated UV photons from a newly developed solid scintillator, LaF$_3$(Nd), to the detector and successfully detected single photoelectron.
description: Poster presentation at ICHEP08 Philadelphia, USA, July 2008. 3 pages, LaTeX, 4 eps figures
La tradizione trobadorica: manoscritti, fonti, compilazioni. Tavola rotonda (Milano, 12 maggio 2014)
Creators: name: Viel, Riccardo
name: Barachini, Giorgio
name: Costantini, Fabrizio
name: Cura Curà, Giulio
name: Mantovani, Dario
name: Resconi, Stefano
Publisher: name: Università degli Studi di Milano
Year: 2014
Subjects: lirica trobadorica; troubadour lyric; tradizione manoscritta; manuscript tradition

description: La sezione raccoglie gli interventi presentati alla tavola rotonda "La tradizione trobadorica: manoscritti, fonti, compilazioni" tenutasi presso l'Università degli Studi di Milano il 12 maggio 2014, nel quadro del Convegno internazionale "Anomalie, residui e riusi nelle tradizioni liriche romanze medievali".

The section includes the papers presented at the round table "The troubadour tradition: manuscripts, sources, compilations" held at the University of Milan May 12, 2014, as part of the International Congress "Anomalies, residues and reuse in medieval Romance lyrics traditions"
description: Carte romanze, Vol 2, No 1 (2014)
title: Front Matter, Table of Contents, Preface, Conference Organization
Creators: name: D'Angelo, Gianlorenzo
Publisher: name: Schloss Dagstuhl – Leibniz-Zentrum für Informatik
Year: 2018
Subjects: subject: Front Matter
subject: Table of Contents
subject: Preface
subject: Conference Organization

description: Gianlorenzo
description: LIPIcs, Vol. 103, 17th International Symposium on Experimental Algorithms (SEA 2018), pages 0:i-0:xi
Block Density Matrix Renormalization Group with Effective Interactions
Creators: name: Ma, Haibo
name: Liu, Chungen
name: Jiang, Yuansheng
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Based on the contractor renormalization group (CORE) method and the density matrix renormalization group (DMRG) method, a new computational scheme, which is called the block density matrix renormalization group with effective interactions (BDMRG-EI), is proposed to deal with the numerical computation of quantum correlated systems. Different from the convential CORE method in the ways of calculating the blocks and the fragments, where the DMRG method instead of the exact diagonalization is employed in BDMRG-EI, DMRG-EI makes the calculations of larger blocks and fragments applicable. Integrating DMRG's advantage of high accuracy and CORE's advantage of low computational costs, BDMRG-EI can be widely used for the theoretical calculations of the ground state and low-lying excited states of large systems with simple or complicated connectivity. Test calculations on a 240 site one-dimensional chain and a double-layer polyacene oligomer containing 48 hexagons demonstrate the efficiency and potentiality of the method.
The lightest Higgs boson mass in effective field theory with bulk and brane supersymmetry breaking
Creators: name: Uekusa, Nobuhiro
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the mass of the lightest Higgs boson in an effective Kaluza-Klein theory with two sources of supersymmetry breaking. When stop mass matrices are non-diagonal with respect to Kaluza-Klein modes and each element is not small in unit of the inverse compactification radius, a very small eigenvalue can be accommodated in the diagonalized basis. We show that in the model with the two sources, the Higgs boson mass can receive suitable corrections for various compactification radii.
description: 23 pages, 3 figures, typos corrected, sentences modified
BRST structure of non-linear superalgebras
Creators: name: Asorey, M.
name: Lavrov, P. M.
name: Radchenko, O. V.
name: Sugamoto, A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper we analyse the structure of the BRST charge of nonlinear superalgebras. We consider quadratic non-linear superalgebras where a commutator (in terms of (super) Poisson brackets) of the generators is a quadratic polynomial of the generators. We find the explicit form of the BRST charge up to cubic order in Faddeev-Popov ghost fields for arbitrary quadratic nonlinear superalgebras. We point out the existence of constraints on structure constants of the superalgebra when the nilpotent BRST charge is quadratic in Faddeev-Popov ghost fields. The general results are illustrated by simple examples of superalgebras.
description: 15 pages, Latex, references added, misprints corrected, comments added
Linear precision for toric surface patches
Creators: name: von Bothmer, Hans-Christian Graf
name: Ranestad, Kristian
name: Sottile, Frank
Publisher: name: arXiv
Year: 2008
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14M25; 65D17

description: We classify the homogeneous polynomials in three variables whose toric polar linear system defines a Cremona transformation. This classification also includes, as a proper subset, the classification of toric surface patches from geometric modeling which have linear precision. Besides the well-known tensor product patches and Bézier triangles, we identify a family of toric patches with trapezoidal shape, each of which has linear precision. Bézier triangles and tensor product patches are special cases of trapezoidal patches.
Restless quiescence: thermonuclear flashes between transient X-ray outbursts
Creators: name: Kuulkers, E.
name: Zand, J. J. M. in 't
name: Lasota, J. -P.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: For thermonuclear flashes to occur on neutron-star surfaces, fuel must have been accreted from a donor star. However, sometimes flashes are seen from transient binary systems when they are thought to be in their quiescent phase, during which no accretion, or relatively little, is expected to occur. We investigate the accretion luminosity during several such flashes, including the first-ever and brightest detected flash from Cen X-4 in 1969. We infer from observations and theory that immediately prior to these flashes the accretion rate must have been between about 0.001 and 0.01 times the equivalent of the Eddington limit, which is roughly 2 orders of magnitude less than the peak accretion rates seen in these transients during an X-ray outburst and 3-4 orders of magnitude more than the lowest measured values in quiescence. Furthermore, three such flashes, including the one from Cen X-4, occurred within 2 to 7 days followed by an X-ray outburst. A long-term episode of enhanced, but low-level, accretion is predicted near the end of the quiescent phase by the disk-instability model, and may thus have provided the right conditions for these flashes to occur. We discuss the possibility of whether these flashes acted as triggers of the outbursts, signifying a dramatic increase in the accretion rate. Although it is difficult to rule out, we find it unlikely that the irradiance by these flashes is sufficient to change the state of the accretion disk in such a dramatic way.
description: 9 pages, 3 figures, accepted for publication in A&A; referee comments included plus improved text; results unchanged
Corporate transfers : the personality determinants of a successful transfer candidate
Creators: name: Goldberg, Valerie Patricia
Publisher: name: University of British Columbia
Year: 2010

description: Numerous benefits and costs associated with corporate transfers were explored. Substantive organizational, personal and familial costs emerging as a result of an unsuccessful transfer experience were addressed. The financial nature of relocation compensation has not been successful in rectifying the emergence of organizational and human costs arising as a result of an unsuccessful transfer experience nor has it been successful in counteracting the current anti-mobility trend. It was proposed that the organizational, personal and familial costs may be minimized through the adoption of a selection program which not only places emphasis upon the needs of the organization but which also considers the personality traits of the transfer candidate and his or her spouse. Central to this proposal was the supposition that the personality correlates of the executive would have a direct bearing upon the favourableness of the executive's attitude toward transfers in general and that the personality correlates of the spouse would have an influential effect upon the executive's attitude. A group of 164 managers and their spouses who had been transferred at least once by their present employer served as the sample. The study investigated hypothesized relationships between the favourableness of the executive's attitude toward transfers in general and a number of personality variables. These variables included the executive's age as well as his scores on job-involvement, company commitment, authoritarianism social extraversion-introversion and locus of control and the spouse's scores on authoritarianism, social extraversion-introversion and locus of control. Correlational analysis was employed to analyze the data. The results did not lend conclusive support to the hypothesized relationships and thus the personality profile of an executive who would possess a favourable attitude toward transfers in general did not emerge. Methodological shortcomings were explored and an alternative methodology for the identification of an executive who would display post-transfer satisfaction was suggested.
Depinning frequency in a heavily neutron-irradiated MgB2 sample
Creators: name: Bonura, M.
name: Gallitto, A. Agliolo
name: Vigni, M. Li
name: Martinelli, A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The magnetic-field-induced variations of the microwave surface resistance have been investigated in a heavily neutron-irradiated MgB2 sample, in which the irradiation has caused the merging of the two gaps into a single value. The experimental results have been analyzed in the framework of the Coffey and Clem model. By fitting the experimental data, we have determined the field dependence of the depinning frequency, omega_0, at different values of the temperature. Although the pinning is not particularly effective, the value of omega_0 obtained at low temperatures is considerably higher than that observed in conventional low-temperature superconductors.
description: 15 pages, 6 figures; to be published in Physica C