cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Η λειτουργικoασματική παράδοση και πράξη στο έργο του πατρός Κωνσταντίνου Παπαγιάννη
Creators: name: Γιαννοπούλου, Στεφανία Εμμανουήλ
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: π. Κωνσταντίνος Παπαγιάννης
Λειτουργική
Ναός Αγίων Αποστόλων Θεσσαλονίκης
Father Constantinos Papagiannis
Liturgical and chanting
Twelve Apostles in Thessaloniki

description: Η παρούσα εργασία αποτελεί μια προσπάθεια παρουσίασης του συγγραφικού, εκδεδομένου και ανέκδοτου, έργου του π.Κωνσταντίνου Παπαγιάννη. Συγκεκριμένα, μελετείται η συμβολή του στα θεολογικά γράμματα από λειτουργικής, μουσικής και κηρυκτικής πλευράς. Στα δύο πρώτα κεφάλαια εξετάζονται τα λειτουργικά και τα μουσικά θέματα τόσο για το γνωστό, όσο και για το άγνωστο υλικό που ο ίδιος συγκέντρωσε και επεξεργάστηκε, ενώ στο τρίτο τα σχετικά με το κήρυγμα ζητήματα. Προσεγγίζονται θέματα που αφορούν στη μυστηριακή ζωή της Εκκλησίας και τα οποία εφάρμοζε ο ίδιος στον Ιερό Ναό των Αγίων Αποστόλων
description: The present work is an attempt to present some published and unpublished works of father Constantinos Papagiannis. In particular, in this essay we present his contribution to the Orthodox life from a liturgical, musical and preaching point of view. The first two chapters deal with the liturgical and musical aspects of both the known and the unknown material that he collected and published, and the third chapter deals with the issues of preaching. Topics related to the spiritual life of the Orthodox Church were approached and set in use by f. Constantinos to the parish of the Twelve Apostles in Thessaloniki where he was a priest
The Geometry of Small Causal Diamonds
Creators: name: Gibbons, G. W.
name: Solodukhin, S. N.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Differential Geometry (math.DG)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: The geometry of causal diamonds or Alexandrov open sets whose initial and final events $p$ and $q$ respectively have a proper-time separation $τ$ small compared with the curvature scale is a universal. The corrections from flat space are given as a power series in $τ$ whose coefficients involve the curvature at the centre of the diamond. We give formulae for the total 4-volume $V$ of the diamond, the area $A$ of the intersection the future light cone of $p$ with the past light cone of $q$ and the 3-volume of the hyper-surface of largest 3-volume bounded by this intersection valid to ${\cal O} (τ^4) $. The formula for the 4-volume agrees with a previous result of Myrheim. Remarkably, the iso-perimetric ratio ${3V_3 \over 4 π} / ({A \over 4 π}) ^{3 \over 2} $ depends only on the energy density at the centre and is bigger than unity if the energy density is positive. These results are also shown to hold in all spacetime dimensions. Formulae are also given, valid to next non-trivial order, for causal domains in two spacetime dimensions. We suggest a number of applications, for instance, the directional dependence of the volume allows one to regard the volumes of causal diamonds as an observable providing a measurement of the Ricci tensor.
description: 17 pages, no figures; Misprints in eqs.(62), (65), (66) and (81) corrected; a new note on page 13 (with 2 new equations) added
Exploring the Representational Power of Graph Autoencoder
Creators: name: Haddad, Maroun
name: Bouguessa, Mohamed
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: While representation learning has yielded a great success on many graph learning tasks, there is little understanding behind the structures that are being captured by these embeddings. For example, we wonder if the topological features, such as the Triangle Count, the Degree of the node and other centrality measures are concretely encoded in the embeddings. Furthermore, we ask if the presence of these structures in the embeddings is necessary for a better performance on the downstream tasks, such as clustering and classification. To address these questions, we conduct an extensive empirical study over three classes of unsupervised graph embedding models and seven different variants of Graph Autoencoders. Our results show that five topological features: the Degree, the Local Clustering Score, the Betweenness Centrality, the Eigenvector Centrality, and Triangle Count are concretely preserved in the first layer of the graph autoencoder that employs the SUM aggregation rule, under the condition that the model preserves the second-order proximity. We supplement further evidence for the presence of these features by revealing a hierarchy in the distribution of the topological features in the embeddings of the aforementioned model. We also show that a model with such properties can outperform other models on certain downstream tasks, especially when the preserved features are relevant to the task at hand. Finally, we evaluate the suitability of our findings through a test case study related to social influence prediction.
On complete system of invariants for the binary form of degree 7
Creators: name: Bedratyuk, Leonid
Publisher: name: arXiv
Year: 2006
Subjects: subject: Algebraic Geometry (math.AG)
subject: Commutative Algebra (math.AC)
subject: FOS: Mathematics
subject: 13N15;13A50;13F20

description: A minimal system of homogeneous generating elements of the invariants algebra for the binary form of degree 7 is calculated.
description: 14 pages
Spatial Decorrelation of Young Stars and Dense Gas as a Probe of the Star Formation-Feedback Cycle in Galaxies
Creators: name: Semenov, Vadim A.
name: Kravtsov, Andrey V.
name: Gnedin, Nickolay Y.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The spatial decorrelation of dense molecular gas and young stars observed on $\lesssim 1$ kiloparsec scales in nearby galaxies indicates rapid dispersal of star-forming regions by stellar feedback. We explore the sensitivity of this decorrelation to different processes controlling the structure of the interstellar medium, the abundance of molecular gas, star formation, and feedback in a suite of simulations of an isolated dwarf galaxy with structural properties similar to NGC300 that self-consistently model radiative transfer and molecular chemistry. Our fiducial simulation reproduces the magnitude of decorrelation and its scale dependence measured in NGC300, and we show that this agreement is due to different aspects of feedback, including H$_2$ dissociation, gas heating by the locally variable UV field, early mechanical feedback, and supernovae. In particular, early radiative and mechanical feedback affects the correlation on $\lesssim 100$ pc scales, while supernovae play a significant role on $\gtrsim 100$ pc scales. The correlation is also sensitive to the choice of the local star formation efficiency per freefall time, $ε_{\rm ff}$, which provides a strong observational constraint on $ε_{\rm ff}$ when the global star formation rate is independent of its value. Finally, we explicitly show that the degree of correlation between the peaks of molecular gas and star formation density is directly related to the distribution of the lifetimes of star-forming regions.
description: 21 pages + appendix, 17 figures; published in ApJ; the animated version of Figure 1 is available in the online version of the article and at https://vadimsemenov.com/research/ngc300
Simple and efficient generation of gap solitons in Bose-Einstein condensates
Creators: name: Matuszewski, Michal
name: Krolikowski, Wieslaw
name: Trippenbach, Marek
name: Kivshar, Yuri S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We suggest an efficient method for generating matter-wave gap solitons in a repulsive Bose-Einstein condensate, when the gap soliton is formed from a condensate cloud in a harmonic trap after turning on a one-dimensional optical lattice. We demonstrate numerically that this approach does not require preparing the initial atomic wave packet in a specific state corresponding to the edge of the Brillouin zone of the spectrum, and losses that occur during the soliton generation process can be suppressed by an appropriate adiabatic switching of the optical lattice.
description: 7 pages, 10 figures
title: Serruria :
title: Principes directeurs pour la conduite de l’examen de la distinction, de l’homogénéité et de la stabilité.
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: Group identity.
New Varieties of Plants
Serruria

description: Ces principes directeurs (“principes directeurs d’examen”) visent à approfondir les principes énoncés dans l’introduction générale (document TG/1/3) et dans les documents TGP qui s’y rapportent afin de donner des indications concrètes détaillées pour l’harmonisation de l’examen de la distinction, de l’homogénéité et de la stabilité (DHS) et, en particulier, à identifier des caractères convenant à l’examen DHS et à la production de descriptions variétales harmonisées.
Χρήση βίας και το δόγμα unable - unwilling
Creators: name: Μούζουλας, Αναστάσιος Θεμιστοκλή
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Χρήση βίας
Δόγμα unable/unwilling
Άμυνα
Use of force
Unable/unwilling doctrine
Defense

description: Σκοπός της παρούσας διπλωματικής εργασίας είναι η μελέτη του δικαίου της χρήσης βίας, υπό το πρίσμα του Δόγματος «Μη Ικανού/Μη Προθύμου Κράτους» (Unable/Unwilling State). Αρχικά, γίνεται μία σύντομη αναφορά στον κανόνα της απαγόρευσης απειλής ή χρήσης βίας, με βάση τον Καταστατικό Χάρτη των Ηνωμένων Εθνών και τις θεσμοθετημένες εξαιρέσεις αυτού. Εν συνεχεία, παρουσιάζονται οι νέας μορφής απειλές, οι οποίες λόγω του εύρους και της πολυπλοκότητάς τους, είναι ικανές να πλήξουν συθέμελα το διεθνές οικοδόμημα των Ηνωμένων Εθνών. Περαιτέρω, παρατίθενται οι τρόποι με τους οποίους δύνανται να αντιμετωπισθούν οι ως άνω απειλές και οι ενδεχόμενες προβληματικές που τις ακολουθούν. Επίσης, παρουσιάζεται διεξοδικά το ισχύον νομικό πλαίσιο, μέσω των απαιτούμενων προϋποθέσεων και κριτηρίων, προκειμένου να ενεργοποιηθεί το δικαίωμα εξωεδαφικής άμυνας κατά μη κρατικών δρώντων, καθώς και η προσπάθεια επανερμηνείας τού υπό κρίση άρθρου 51 του Καταστατικού Χάρτη, ούτως ώστε να επιτρέπεται μονομερής επέμβαση, εκτός του θεσμικού πλαισίου του Κεφαλαίου VII. Το Δόγμα αποτελεί έκφανση αυτού του εγχειρήματος, γι’ αυτό και συνιστά αντικείμενο έρευνας, όσον αφορά την εφαρμογή του και την ενδεχόμενη ανάδειξή του, ως ενός νέου εθιμικού κανόνα δικαίου, που θα αναδιαμορφώσει το δίκαιο της χρήσης βίας
description: The aim of this thesis is to study the law of the use of force in the light of the "Unable/Unwilling State" Doctrine. Initially, a brief reference is made to the rule of prohibition of threat or use of force, based on the United Nations Charter and its established exceptions. Subsequently, new threats are presented, which due to their gravity and complexity, are capable of affecting the United Nations' international structure in depth. Furthermore, the ways in which the above threats and their possible problematic aspects can be dealt with are listed. A detailed overview of the existing legal framework is also provided, through the necessary conditions and criteria, that the right of extraterritorial defense against non-state actors would be activated, as well as the attempt to reinterpret Article 51 of the United Nations Charter, in order to allow unilateral intervention, outside the institutional framework of Chapter VII. The Doctrine is a part of this venture, and therefore is being analyzed as to its implementation and its possible emergence as a new customary rule of law that will reform the law of the use of force
Closed string deformations in open string field theory I: bosonic string
Creators: name: Maccaferri, Carlo
name: Vošmera, Jakub
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: This is the first of a series of three papers on open string field theories based on Witten star product deformed with a gauge invariant open/closed coupling. This deformation is a tree-level tadpole which destabilizes the initial perturbative vacuum. We discuss the existence of vacuum-shift solutions which cancel the tadpole and represent a new configuration where the initial D-brane system has adapted to the change in the closed string background. As an example we consider the bulk deformation which changes the compactification radius and, to first order in the deformation, we reproduce the shift in the mass of the open string KK modes from the new kinetic operator after the vacuum shift. We also discuss the possibility of taming closed string degenerations with the open string propagator in the simplest amplitude corresponding to two closed strings off a disk.
description: 30 pages, no figures. V2: minor improvements, JHEP version
Κλείτος Κύρου «επί πίνακι»
Creators: name: Παπαλεξάτου, Σταυρούλα Σπυρίδωνος
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Πίνακας λέξεων
Λήμμα
Κλείτος Κύρου
Tables of words
Kleitos Kyrou
lemma

description: Ένας πίνακας λέξεων αποτελεί βασικό εργαλείο σε μία έρευνα, καθώς αποκαλύπτει πού βρίσκεται μία συγκεκριμένη λέξη μέσα στο λογοτεχνικό σώμα ενός ποιητή και δηλώνει πόσες φορές αυτή απαντάται σε όλο το έργο του δημιουργού. Έτσι, μαρτυρούνται οι γλωσσικές προτιμήσεις του ποιητή. Η παρούσα εργασία ασχολείται με τη συγκρότηση πίνακα λέξεων του ποιητή Κλείτου Κύρου στο σύνολο του ποιητικού του έργου. Θα γίνει καταχώριση όλων των λέξεων που αφορούν τα ποιήματα, τους τίτλους και τις αφιερώσεις των απάντων του ποιητή. Σκοπός της εργασίας είναι να συμβάλει στην ήδη υπάρχουσα προσπάθεια, ώστε να δημιουργηθεί ένας συνολικός πίνακας λέξεων για ένα μεγάλο μέρος Ελλήνων ποιητών, των σημαντικότερων ίσως της νεοελληνικής λογοτεχνίας. Μία τέτοιου είδους μελέτη θα αποτελέσει σημαντικό εργαλείο για μελλοντικούς ερευνητές, καθώς θα καταστήσει πιο εύκολη την εύρεση λέξεων μέσα σε ένα μεγάλο πλήθος ποιημάτων. Συγκεκριμένα, έχω επιλέξει τον Κλείτο Κύρου, έναν ιδιαίτερο ποιητή της πρώτης μεταπολεμικής γενιάς, για να εμπνευστούν επόμενοι ερευνητές και να ασχοληθούν με το έργο λογοτεχνών που δεν έχουν μελετηθεί διεξοδικά
description: Tables of words focus on important analytical tools for modern literature research projects. They identify the location of a word in the work of a poet, and they record how many times this word appears in one’s poetic work . In this way, tables reveal the linguistic preferences of the poet. The aim of this dissertation is the creation of a table, which entails all words and names found in the poems, titles and dedications in the published work of the poet Kleitos Kyrou. More specifically, words and names are included in the table in an alphabetical order. They are also accompanied by references which enable the reader to locate them in the poet’s work. Similarly to previous academic work focused on tables, the aim of this dissertation is to contribute to the creation of a larger table which will include a great number of Greek poets ( the most important ones of the Greek literature). I am focusing on Kleitos Kyrou, a unique poet of the poetry movements arising after the Greek Civil War in the late 1940s. The focus on kleitos Kyrou is not accidental. This work is part of an emerging literature that underlines the need to focus on poets who have been so far understudied
Shaping bipolar Planetary Nebulae : How mass loss leads to waistline development
Creators: name: Dijkstra, Catharinus
name: Speck, Angela
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Asymptotic Giant Branch (AGB) stars generally have spherically symmetric envelopes, whereas most post-AGB stars and Planetary Nebulae (PNe) show axisymmetric circumstellar envelopes. While various mechanisms for axisymmetric circumstellar structures may explain the shapes of PNe, they do not address how the shape of the circumstellar shell evolves. Here we address the temporal changes in the axisymmetry of AGB star envelopes, and in particular the development of the torus required in the Generalized Interacting Stellar Winds (GISW) model. Assuming (1) an AGB star rotates with sufficient angular speed at the start of the AGB phase; and (2) that the rotational angular momentum of the AGB star is conserved, we demonstrate that some very important observational features of AGB star axisymmetry evolution can be reproduced. We find that, compared to the star's increasing luminosity and decreasing effective temperature, the decreasing mass of the star primarily affects the axisymmetry of the envelope. When a representative mass loss history is adopted, where most of the mass is lost near the end of the AGB phase, the envelope's axisymmetry increases over time, with the strongest increase occurring near the end of the AGB phase. This may naturally explain why most AGB stars have spherically symmetric envelopes, while axisymmetry seems common-place in the post-AGB/PNe phase. The degree of axisymmetry at the end of the AGB phase is found to increase with increasing main sequence mass, and the onset of axisymmetry occurs only after the onset of the superwind (SW) phase, in good agreement with the observations.
description: 15 pages, 2 figures, accepted by ApJ
Energy hardware and workload aware job scheduling towards interconnected HPC environments
Creators: name: D'Amico, Marco
name: Corbalan, Julita
Publisher: name: arXiv
Year: 2021
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: New HPC machines are getting close to the exascale. Power consumption for those machines has been increasing, and researchers are studying ways to reduce it. A second trend is HPC machines' growing complexity, with increasing heterogeneous hardware components and different clusters architectures cooperating in the same machine. We refer to these environments with the term heterogeneous multi-cluster environments. With the aim of optimizing performance and energy consumption in these environments, this paper proposes an Energy-Aware-Multi-Cluster (EAMC) job scheduling policy. EAMC-policy is able to optimize the scheduling and placement of jobs by predicting performance and energy consumption of arriving jobs for different hardware architectures and processor frequencies, reducing workload's energy consumption, makespan, and response time. The policy assigns a different priority to each job-resource combination so that the most efficient ones are favored, while less efficient ones are still considered on a variable degree, reducing response time and increasing cluster utilization. We implemented EAMC-policy in Slurm, and we evaluated a scenario in which two CPU clusters collaborate in the same machine. Simulations of workloads running applications modeled from real-world show a reduction of response time and makespan by up to 25% and 6% while saving up to 20% of total energy consumed when compared to policies minimizing runtime, and by 49%, 26%, and 6% compared to policies minimizing energy.
String Theory and Pre-big bang Cosmology
Creators: name: Gasperini, M.
name: Veneziano, G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In string theory, the traditional picture of a Universe that emerges from the inflation of a very small and highly curved space-time patch is a possibility, not a necessity: quite different initial conditions are possible, and not necessarily unlikely. In particular, the duality symmetries of string theory suggest scenarios in which the Universe starts inflating from an initial state characterized by very small curvature and interactions. Such a state, being gravitationally unstable, will evolve towards higher curvature and coupling, until string-size effects and loop corrections make the Universe "bounce" into a standard, decreasing-curvature regime. In such a context, the hot big bang of conventional cosmology is replaced by a "hot big bounce" in which the bouncing and heating mechanisms originate from the quantum production of particles in the high-curvature, large-coupling pre-bounce phase. Here we briefly summarize the main features of this inflationary scenario, proposed a quarter century ago. In its simplest version (where it represents an alternative and not a complement to standard slow-roll inflation) it can produce a viable spectrum of density perturbations, together with a tensor component characterized by a "blue" spectral index with a peak in the GHz frequency range. That means, phenomenologically, a very small contribution to a primordial B-mode in the CMB polarization, and the possibility of a large enough stochastic background of gravitational waves to be measurable by present or future gravitational wave detectors.
description: 25 pages, five figures. Contribution to the special issue of IL NUOVO CIMENTO, published in honor of Gaetano Vilasi on the occasion of his 70-th birthday (Il Nuovo Cimento C, Italian Physical Society, 2015)
Closed string deformations in open string field theory II: superstring
Creators: name: Maccaferri, Carlo
name: Vošmera, Jakub
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: This is the second paper of a series of three. We construct effective open-closed superstring couplings by classically integrating out massive fields from open superstring field theories coupled to an elementary gauge invariant tadpole proportional to an on-shell closed string state in both large and small Hilbert spaces, in the NS sector. This source term is well known in the WZW formulation and by explicitly performing a novel large Hilbert space perturbation theory we are able to characterize the first orders of the vacuum shift solution, its obstructions and the non-trivial open-closed effective couplings in closed form. With the aim of getting all order results, we also construct a new observable in the $A_\infty$ theory in the small Hilbert space which correctly provides a gauge invariant coupling to physical closed strings and which descends from the WZW open-closed coupling upon partial gauge fixing and field redefinition. Armed with this new $A_\infty$ observable we use tensor co-algebra techniques to efficiently package the whole perturbation theory necessary for computing the effective action and we give all order results for the open-closed effective couplings in the small Hilbert space.
description: 35 pages, no figures. V2: 39 pages, an explicit example of superstring mass deformation added. JHEP version
The exact numerical treatment of inflationary models
Creators: name: Ringeval, Christophe
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The precision reached by the recent CMB measurements gives new insights into the shape of the primordial power spectra of the cosmological perturbations. In the context of inflationary cosmology, this implies that the CMB data are now sensitive to the form of the inflaton potential. Most of the current approaches devoted to the derivation of the inflationary primordial power spectra, or to the inflaton potential reconstruction problem, rely on approximate analytical treatments that may break down for exotic models. In this article, we numerically solve the inflationary evolution of both the background and all the perturbed quantities to extract the primordial power spectra exactly. Such a method solely relies on General Relativity and linear perturbation theory. More than providing a tool to test analytical approximations, one may consider, without complications, the treatment of non-standard inflationary models as those involving several fields, eventually non-minimally coupled to gravity. The usefulness of the exact numerical approach to deal with CMB data is illustrated by analysing the WMAP third year data in the context of single field models. For this purpose, we introduce a new inflationary related parameter encoding the basic properties of the reheating era. This reheating parameter has significant observable effects and provides a self-consistency test of inflationary models. As a working example, the marginalised probability distributions of the reheating and potential parameters associated with the small field models are presented.
description: 33 pages, 12 figures. Misprints corrected, matches published version
Empirical performance bounds for quantum approximate optimization
Creators: name: Lotshaw, Phillip C.
name: Humble, Travis S.
name: Herrman, Rebekah
name: Ostrowski, James
name: Siopsis, George
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: The quantum approximate optimization algorithm (QAOA) is a variational method for noisy, intermediate-scale quantum computers to solve combinatorial optimization problems. Quantifying performance bounds with respect to specific problem instances provides insight into when QAOA may be viable for solving real-world applications. Here, we solve every instance of MaxCut on non-isomorphic unweighted graphs with nine or fewer vertices by numerically simulating the pure-state dynamics of QAOA. Testing up to three layers of QAOA depth, we find that distributions of the approximation ratio narrow with increasing depth while the probability of recovering the maximum cut generally broadens. We find QAOA exceeds the Goemans-Williamson approximation ratio bound for most graphs. We also identify consistent patterns within the ensemble of optimized variational circuit parameters that offer highly efficient heuristics for solving MaxCut with QAOA. The resulting data set is presented as a benchmark for establishing empirical bounds on QAOA performance that may be used to test on-going experimental realizations.
description: 17 pages, 11 figures
On the velocity and chemical-potential dependence of the heavy-quark interaction in N=4 SYM plasmas
Creators: name: Avramis, Spyros D.
name: Sfetsos, Konstadinos
name: Zoakos, Dimitrios
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider the interaction of a heavy quark-antiquark pair moving in N=4 SYM plasma in the presence of non-vanishing chemical potentials. Of particular importance is the maximal length beyond which the interaction is practically turned off. We propose a simple phenomenological law that takes into account the velocity dependence of this screening length beyond the leading order and in addition its dependence on the R-charge. Our proposal is based on studies using rotating D3-branes.
description: 24 pages, 10 figures; v2: energy regularization discussed in detail, references added, version to appear in Phys. Rev. D
Ζητήματα αιτιώδους συνδέσμου στο ποινικό δίκαιο
Creators: name: Καραμπάτση, Ελένη Πασχάλη
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Ποινικό δίκαιο
Αιτιώδης σύνδεσμος
Αιτιότητα
Criminal law
Causation
Causality

description: Στο πλαίσιο της παρούσας εργασίας επιχειρείται η προσέγγιση της αιτιώδους συνάφειας ως έννοιας του ποινικού δικαίου και του τρόπου θεώρησής της τόσο από τους θεωρητικούς όσο και από τους εφαρμοστές του δικαίου. Στο πρώτο μέρος, παρουσιάζονται οι κυριότερες θεωρίες για την διαπίστωση του αντικειμενικού αιτιώδους συνδέσμου καθώς και η νομολογιακώς τιθέμενη προϋπόθεση της αμεσότητας ως κριτήριο για τη κατάφαση της αιτιώδους συνάφειας μεταξύ συμπεριφοράς και αποτελέσματος. Επίσης, γίνεται προσπάθεια κριτικής προσέγγισης των προτεινόμενων θεωριών και κατόπιν επιχειρείται η υπεράσπιση της θεωρίας του ισοδυνάμου των όρων που κατά τη γράφουσα κρίνεται ως ικανοποιητικότερη για την εξεύρεση του αιτιώδους συνδέσμου στο πλαίσιο του ποινικού δικαίου. Στο δεύτερο μέρος της εργασίας, γίνεται προσέγγιση της έννοιας της αιτιότητας μέσα από νομολογικά παραδείγματα και συγκεκριμένα, εξετάζεται ο τρόπος αντιμετώπισης συγκεκριμένων περιστατικών από τη νομολογία και ο ρόλος του αιτιώδους συνδέσμου στην αξιολόγηση των κατ’ ιδίαν περιπτώσεων από το Δικαστήριο
description: The paper approaches causation in criminal law and examines the way it has been viewed by law theory and practice. In the first part of the paper, the main theories about establishing causation are presented, as well as the criteria developed by case law are discussed. Moreover, the different theories are critically discussed while the “conditio sine qua non” theory is proposed as the most sufficient for establishing causation in criminal law. Finally, in the second part, causation is examined through case law examples focusing on the treatment of specific incidents by case law while the role of causation in the evaluation of these incidents by the Courts is discussed
Closed string deformations in open string field theory III: ${\cal N}=2$ worldsheet localization
Creators: name: Maccaferri, Carlo
name: Vošmera, Jakub
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper, which is the last of a series of three, we first verify that the two open-closed effective potentials derived in the previous paper from the WZW theory in the large Hilbert space and the $A_\infty$ theory in the small Hilbert space have the same vacuum structure. In particular, we show that mass-term deformations given by the effective (two open)-(one closed) couplings are the same, provided the effective tadpole is vanishing to first order in the closed string deformation. We show that this condition is always realized when the worldsheet BCFT enjoys a global ${\cal N}=2$ superconformal symmetry and the deforming closed string belongs to the chiral ring in both the holomorphic and anti-holomorphic sector. In this case it is possible to explicitly evaluate the mass deformation by localizing the SFT Feynman diagrams to the boundary of world-sheet moduli space, reducing the amplitude to a simple open string two-point function. As a non-trivial check of our construction we couple a constant Kalb-Ramond closed string state to the OSFT on the $\text{D}3$--$\text{D}(-1)$ system and we show that half of the bosonic blowing-up moduli become tachyonic, making the system condense to a bound state whose binding energy we compute exactly to second order in the closed string deformation, finding agreement with the literature.
description: 25 pages, no figures. V2: minor improvements, JHEP version
Metastability of Blume-Capel model with zero chemical potential and zero external field
Creators: name: Kim, Seonwoo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60J28, 60K35, 82C22

description: In this study, we investigate the metastable behavior of Metropolis-type Glauber dynamics associated with the Blume-Capel model with zero chemical potential and zero external field at very low temperatures. The corresponding analyses for the same model with zero chemical potential and positive small external field were performed in [Cirillo and Nardi, Journal of Statistical Physics, 150: 1080-1114, 2013] and [Landim and Lemire, Journal of Statistical Physics, 164: 346-376, 2016]. We obtain both large deviation-type and potential-theoretic results on the metastable behavior in our setting. To this end, we perform highly thorough investigation on the energy landscape, where it is revealed that no critical configurations exist and alternatively a massive flat plateau of saddle configurations resides therein.
description: 48 pages, 7 figures
Gauge invariant discretization of Poincare quantum gravity
Creators: name: Zubkov, M. A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper we suggest gauge invariant discretization of Poincare quantum gravity. We generalize Regge calculus to the case of Riemann-Cartan space. The basic element of the constructed discretization is piecewize linear Riemann-Cartan space with flat pieces of hypercubic form. We consider the model with squared curvature action and calculate the correspondent lattice action. We construct local measure over the dynamical variables of the lattice model.
description: 12 pages, to appear in Phys.Lett.B
Prevalence of Extra Power-Law Spectral Components in Short Gamma-Ray Bursts
Creators: name: Tang, Qing-Wen
name: Wang, Kai
name: Li, Liang
name: Liu, Ruo-Yu
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Prompt extra power-law (PL) spectral component is discovered in some bright gamma-ray bursts (GRBs), which usually dominates the spectral energy distribution below tens of keV or above about 10 MeV. However, its origin is still unclear. In this paper, we present a systematic analysis 13 Fermi short GRBs as of August 2020, with the contemporaneous keV-MeV and GeV detections at the prompt emission phase. We find that the extra PL component is a ubiquitous spectral feature for short GRBs, showing up in all 13 analyzed GRBs. The PL indices are mostly harder than -2.0, which may be well reproduced by considering the electromagnetic cascade induced by ultra-relativistic protons or electrons accelerated in the prompt emission phase. The average flux of these extra PL components positively correlates with that of the main spectral components, which implies they may share the same physical origin.
description: Accepted for publication in ApJ. 22 pages, 9 figures, 7 tables
Stellar Fluxes as Probes of Convection in Stellar Atmospheres
Creators: name: Smalley, Barry
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Convection and turbulence in stellar atmospheres have a significant effect on the emergent flux from late-type stars. The theoretical advancements in convection modelling over recent years have proved challenging for the observers to obtain measurements with sufficient precision and accuracy to allow discrimination between the various predictions. An overview of the current observational techniques used to evaluate various convection theories is presented, including photometry, spectrophotometry, and spectroscopy. The results from these techniques are discussed, along with their successes and limitations. The prospects for improved observations of stellar fluxes are also given.
description: 3 pages, 1 figure; to appear in Convection in Astrophysics, Proc. IAUS 239, F.Kupka, I.W. Roxburgh, K.L. Chan eds
Evolution of Tachyon Kink with Electric Field
Creators: name: Cho, Inyong
name: Kwon, O-Kab
name: Lee, Chong Oh
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We investigate the decay of an inhomogeneous D1-brane wrapped on a $S^1$ with an electric field. The model that we consider consists of an array of tachyon kink and anti-kink with a constant electric flux. Beginning with an initially static configuration, we numerically evolve the tachyon field with some perturbations under a fixed boundary condition at diametrically opposite points on the circle $S^1$. When the electric flux is smaller than the critical value, the tachyon kink becomes unstable; the tachyon field rolls down the potential, and the lower dimensional D0- and $\bar {\rm D}0$-brane become thin, which resembles the caustic formation known for this type of the system in the literature. For the supercritical values of the electric flux, the tachyon kink remains stable.
description: 27 pages, 8 figures, some changes, one reference added, version to appear in JHEP
Metal-insulator (fermion-boson)-crossover origin of pseudogap phase of cuprates I: anomalous heat conductivity, insulator resistivity boundary, nonlinear entropy
Creators: name: Abdullaev, B.
name: Park, C. -H.
name: Park, K. -S.
name: Kang, I. -J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Among all experimental observations of cuprate physics, the metal-insulator-crossover (MIC), seen in the pseudogap (PG) region of the temperature-doping phase diagram of copper-oxides under a strong magnetic field, when the superconductivity is suppressed, is most likely the most intriguing one. Since it was expected that the PG-normal state for these materials, as for conventional superconductors, is conducting. This MIC, revealed in such phenomena as heat conductivity downturn, anomalous Lorentz ratio, insulator resistivity boundary, nonlinear entropy, resistivity temperature upturn, insulating ground state, nematicity- and stripe-phases and Fermi pockets, unambiguously indicates on the insulating normal state, from which the high-temperature superconductivity (HTS) appears. In the present work (article I), we discuss the MIC phenomena mentioned in the title of article. The second work (article II) will be devoted to discussion of other listed above MIC phenomena and also to interpretation of the recent observations in the hidden magnetic order and scanning tunneling microscopy (STM) experiments spin and charge fluctuations as the intra PG and HTS pair ones. We find that all these MIC (called in the literature as non-Fermi liquid) phenomena can be obtained within the Coulomb single boson and single fermion two liquid model, which we recently developed, and the MIC is a crossover of single fermions into those of single bosons. We show that this MIC originates from bosons of Coulomb two liquid model and fermions, whose origin is these bosons. At an increase of doping up to critical value or temperature up to PG boundary temperature, the boson system undegoes bosonic insulator - bosonic metal - fermionic metal transitions.
description: 13 pages, 3 figures
XPS and corrosion studies on zinc phosphate treated surfaces of aluminum
Creators: name: Heung, Wai Fan
Publisher: name: University of British Columbia
Year: 2009

description: The work in this thesis deals with an investigation of zinc phosphate (ZPO) treated surfaces of 7075-T6 aluminum alloy. X-ray photoelectron spectroscopy (XPS) and corrosion tests are used to characterize the treated surfaces and to examine their corrosion protection performance. The coating processes are performed by immersing polished alloy surfaces into 10 wt. % of ZPO suspension in water adjusted at various pH conditions. Biased XPS is applied to discriminate the physically trapped and chemically absorbed zinc compounds in the ZPO treated surfaces. Ultrasonic rinsing in distilled water for the treated surfaces is found important in the sample preparation procedure so as to remove any physically trapped compounds from the surfaces. Five different pH conditions (pH3.5, 5.0, 6.6, 10.5, and 13.0) are studied in this work. Acetic acid and sodium hydroxide solution are used to adjust the required pHs for the ZPO solutions. The treated surfaces are studied by angle dependent XPS (ADXPS) to obtain chemical information at different probed depths. ZPO is found to be an effective coating compound for the 7075-T6 aluminum surface. At pH=6.6 and 3.5, the coatings found on the treated surfaces are believed to be respectively a ZnOx-AlOx mixed material and a thin ZPO-like compound. In alkaline and weakly acidic conditions (pH=13.0, 10.5 and 5.0), the coatings formed on the surfaces are enhanced and have stmctures with mixed ZnOx-AlOx-ZPO materials. Weight loss measurements, atomic absorption spectrometry (AAS) and scanning electron microscopy (SEM) are involved in the corrosion studies. 3.5 % NaCl solutions are used as the corrosive environments. Surfaces before and after the corrosion tests are compared to examine the corrosion protection performance of each surface. As judged by XPS, the surface prepared at pH=13.O is likely to provide the best corrosion control among the five treated surfaces. Dissolution of aluminum from the alloy is observed in the corrosive environment. The coating is believed to play a role as a physical barrier to suppress the corrosion attack on aluminum.
The ASKAP-EMU Early Science Project: 888 MHz Radio Continuum Survey of the Large Magellanic Cloud
Creators: name: Pennock, Clara M.
name: van Loon, Jacco Th.
name: Filipovic, Miroslav D.
name: Andernach, Heinz
name: Haberl, Frank
name: Kothes, Roland
name: Lenc, Emil
name: Rudnick, Lawrence
name: White, Sarah V.
name: Agliozzo, Claudia
name: Antón, Sonia
name: Bojicic, Ivan
name: Bomans, Dominik J.
name: Collier, Jordan D.
name: Crawford, Evan J.
name: Hopkins, Andrew M.
name: Jeganathan, Kanapathippillai
name: Kavanagh, Patrick J.
name: Koribalski, Bärbel S.
name: Leahy, Denis
name: Maggi, Pierre
name: Maitra, Chandreyee
name: Marvil, Josh
name: Michałowski, Michał J.
name: Norris, Ray P.
name: Oliveira, Joana M.
name: Payne, Jeffrey L.
name: Sano, Hidetoshi
name: Sasaki, Manami
name: Staveley-Smith, Lister
name: Vardoulaki, Eleni
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present an analysis of a new 120 deg$^{2}$ radio continuum image of the Large Magellanic Cloud (LMC) at 888 MHz with a bandwidth of 288 MHz and beam size of $13\rlap{.}^{\prime\prime}9\times12\rlap{.}^{\prime\prime}1$, from the Australian Square Kilometre Array Pathfinder (ASKAP) processed as part of the Evolutionary Map of the Universe (EMU) survey. The median Root Mean Squared noise is 58 $μ$Jy beam$^{-1}$. We present a catalogue of 54,612 sources, divided over a GOLD list (30,866 sources) complete down to 0.5 mJy uniformly across the field, a SILVER list (22,080 sources) reaching down to $
description: Accepted for publication in MNRAS
Conformal Vector Fields on Tangent Bundle of a Riemannian Manifold
Creators: name: Bidabad, B.
name: Hedayatian, S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Differential Geometry (math.DG)
subject: Metric Geometry (math.MG)
subject: FOS: Mathematics
subject: 53A30;53B20;53B40

description: Let M be an n-dimensional Riemannian manifold and TM its tangent bundle. The conformal and fiber preserving vector fields on TM have well-known physical interpretations and have been studied by physicists and geometricians. Here we define a Riemannian or pseudo-Riemannian lift metric on TM, which is in some senses more general than other lift metrics previously defined on TM, and seems to complete these works. Next we study the lift conformal vector fields on its tangent bundle with this metric and prove among the others that, every complete lift conformal vector field on TM is homothetic, and moreover, every horizontal or vertical lift conformal vector field on TM is a Killing vector.
Smoothed-adaptive perturbed inverse iteration for elliptic eigenvalue problems
Creators: name: Giani, Stefano
name: Grubišić, Luka
name: Heltai, Luca
name: Mulita, Ornela
Publisher: name: arXiv
Year: 2021
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: We present a perturbed subspace iteration algorithm to approximate the lowermost eigenvalue cluster of an elliptic eigenvalue problem. As a prototype, we consider the Laplace eigenvalue problem posed in a polygonal domain. The algorithm is motivated by the analysis of inexact (perturbed) inverse iteration algorithms in numerical linear algebra. We couple the perturbed inverse iteration approach with mesh refinement strategy based on residual estimators. We demonstrate our approach on model problems in two and three dimensions.
description: 30 pages, 15 figures
Theoretical study of the electronic states of hollandite vanadate K$_2$V$_8$O$_{16}$
Creators: name: Horiuchi, S.
name: Shirakawa, T.
name: Ohta, Y.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We consider electronic properties of hollandite vanadate K$_2$V$_8$O$_{16}$, a one-dimensional zigzag-chain system of $t_{2g}$ orbitals in a mixed valent state. We first calculate the Madelung energy and obtain the relative stability of several charge-ordering patterns to determine the most stable one that is consistent with the observed superlattice structure. We then develop the strong-coupling perturbation theory to derive the effective spin-orbit Hamiltonian, starting from the triply-degenerate $t_{2g}$ orbitals in the VO$_6$ octahedral structure. We apply an exact-diagonalization technique on small clusters of this Hamiltonian and obtain the orbital-ordering pattern and spin structures in the ground state. We thereby discuss the electronic and magnetic properties of K$_2$V$_8$O$_{16}$ including predictions on the outcome of future experimental studies.
description: 7 pages, 8 figures
Muon $g-2$ in two Higgs doublet models with vectorlike leptons
Creators: name: Dermisek, Radovan
name: Hermanek, Keith
name: McGinnis, Navin
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We calculate contributions to the anomalous magnetic moment of the muon from heavy neutral and charged Higgs bosons and new leptons in two Higgs doublet models extended by vectorlike leptons. We present detailed predictions of two models with type-II couplings to standard model fermions, motivated by a $Z_2$ symmetry and supersymmetry. In addition, we compare the results with the standard model extended by vectorlike leptons. We find that the model motivated by a $Z_{2}$ symmetry can generate much larger contributions to the magnetic moment compared to the standard model, even by two orders of magnitude due to $\tan^{2}β$ enhancement, while satisfying current constraints. As a consequence, the standard model explanation of the anomaly requires much larger corrections to muon couplings making this model easier to probe at future precision machines. Additionally, we find that the model with couplings motivated by supersymmetry typically leads to much smaller contributions to the anomaly as a result of cancellations. However, we identify interesting scenarios where contributions from the charged Higgs boson can fully explain the anomaly.
description: 24 pages (+ 15 pages appendices), 4 tables, 10 figures. v2: matches published version