cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Anderson localization transition with long-ranged hoppings : analysis of the strong multifractality regime in terms of weighted Levy sums
Creators: name: Monthus, Cecile
name: Garel, Thomas
Publisher: name: arXiv
Year: 2010
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: For Anderson tight-binding models in dimension $d$ with random on-site energies $ε_{\vec r}$ and critical long-ranged hoppings decaying typically as $V^{typ}(r) \sim V/r^d$, we show that the strong multifractality regime corresponding to small $V$ can be studied via the standard perturbation theory for eigenvectors in quantum mechanics. The Inverse Participation Ratios $Y_q(L)$, which are the order parameters of Anderson transitions, can be written in terms of weighted Lévy sums of broadly distributed variables (as a consequence of the presence of on-site random energies in the denominators of the perturbation theory). We compute at leading order the typical and disorder-averaged multifractal spectra $τ_{typ}(q)$ and $τ_{av}(q)$ as a function of $q$. For $q<1/2$, we obtain the non-vanishing limiting spectrum $τ_{typ}(q)=τ_{av}(q)=d(2q-1)$ as $V \to 0^+$. For $q>1/2$, this method yields the same disorder-averaged spectrum $τ_{av}(q)$ of order $O(V)$ as obtained previously via the Levitov renormalization method by Mirlin and Evers [Phys. Rev. B 62, 7920 (2000)]. In addition, it allows to compute explicitly the typical spectrum, also of order $O(V)$, but with a different $q$-dependence $τ_{typ}(q) \ne τ_{av}(q)$ for all $q>q_c=1/2$. As a consequence, we find that the corresponding singularity spectra $f_{typ}(α)$ and $f_{av}(α)$ differ even in the positive region $f>0$, and vanish at different values $α_+^{typ} > α_+^{av}$, in contrast to the standard picture. We also obtain that the saddle value $α_{typ}(q)$ of the Legendre transform reaches the termination point $α_+^{typ}$ where $f_{typ}(α_+^{typ})=0 $ only in the limit $q \to +\infty$.
description: 13 pages, 2 figures, v2=final version
Θεσσαλονίκη, η πόλη της λογοτεχνίας. Μία πολιτιστική διαδρομή με αφορμή τα λογοτεχνικά κείμενα που μιλούν για τη Θεσσαλονίκη.
Creators: name: Παλαιομυλίτη, Ευαγγελία Στυλιανή Λάμπρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2023
Subjects: Πολιτιστική διαδρομή
Πόλη
Λογοτεχνία
Cultural route
City
Literature

description: Η παρούσα διπλωματική εργασία, μέρος της ολοκλήρωσης των σπουδών του ΔΠΜΣ Μουσειολογίας και Διαχείρισης Πολιτισμού πραγματεύεται την αξία των Πολιτιστικών Διαδρομών ως πρακτική για την έλξη των τουριστών καθώς και τον σχεδιασμό μίας τέτοιας διαδρομής.. Αντικείμενο της είναι η λογοτεχνική αποτύπωση των ιστορικών στιγμιότυπων του 20ου αι. στη Θεσσαλονίκη. Πιο αναλυτικά, μετά την μελέτη της ιστορίας καθώς και της λογοτεχνίας που αφορά την πόλη και αφού ορίστηκε ο κύριος του έργου και οι στόχοι του και διατυπώθηκαν η κεντρική προγραματική ιδέα και το μουσειολογικό σκεπτικό σχηματίστηκε μία διαδρομή που περιλαμβάνει την περιήγηση σε σημεία της πόλης, όπου σύμφωνα με τις λογοτεχνικές διηγήσεις διαδραματίστηκε κάποιο συμβάν που σηματοδοτεί μία περίοδο της τοπικής και εθνικής ιστορίας. Στόχος της διαδρομής είναι η εξοικείωση των συμμετεχόντων όχι μόνο με τους λογοτέχνες των μεταπολεμικών γενεών και το έργο τους, αλλά και η γνωριμία τους με τα ιστορικά γεγονότα που αφορούν την πόλη στην οποία διαμένουν για μικρότερο ή μεγαλύτερο διάστημα.
description: This thesis, was conducted as a part of the completion of the studies for the MA in Museology and Cultural Management. It focuses on the value of Cultural Routes as a practice for attracting tourists, as well as the design of a new Cultural Route. The subject of the new cultural route will be the literary depiction of historical moments in Thessaloniki during the 20th century. To be more precise, after studying the history and literature related to the city, defining the manager of the route and their objectives, and formulating the central programmatic idea and museological concept, a route that includes a tour of various points in the city where, according to literary narratives, significant events took place, has been devised , to mark a period of local and national history. The aim of the route is to familiarize the participants, not only with the post-war generations of writers and their work ,but also to introduce them to the historical events concerning the city in which they reside for a shorter or longer period of time.
description: Σε συνεργασία με: Παιδαγωγικό Δημοτικής Εκπαίδευσης (Πανεπιστήμιο Δυτικής Μακεδονίας)
Untersuchungen zum Einfluss von Glucosinolat-Hydrolyseprodukten auf die Genexpression in HCT 116-Zellen mittels high-throughput RT-qPCR
Creators: name: Neumann, Daniel
Publisher: name: Karlsruhe
Year: 2014
Subjects: Glucosinolate
Genexpression
Indol-3-Carbinol
Sulforaphan

description: Häufig wird eine Einnahme von Nahrungsergänzungsmitteln auf Basis von Brokkoli-Extrakten propagiert, um gesundheitsfördernde Wirkungen zu erzielen. In dieser Arbeit wurde in Zellkulturen eine Modulation der Genexpression durch Glucosinolat-Hydrolyseprodukte unter Verwendung einer PCR-basierten Hochdurchsatztechnologie untersucht. Die experimentellen Daten liefern Hinweise darauf, dass mit steigender Konzentration prooxidative und genotoxische Prozesse induziert werden können.
Entwicklung von Mikropartikeln für die kombinatorische Synthese hochdichter Peptidarrays durch laserbasierte Verfahren
Creators: name: Münster, Bastian
Publisher: name: Karlsruhe
Year: 2014
Subjects: Mikropartikel
Peptidarraysynthese

description: Im Rahmen dieser Arbeit wurden mit Aktivester beladene Mikropartikel hergestellt und charakterisiert. Die Partikelzusammensetzung und-größenverteilung wurde auf die Ansprüche des laserbasierten Verfahrens zur Peptidarraysynthese optimiert. Verschiedene analytische Verfahren dienten zur Charakterisierung der Partikeleigenschaften und -funktionalität.
Jensen's functional equation on the symmetric group $\bold{S_n}$
Creators: name: Lê, Công-Trình
name: Thái, Trung-Hiêu
Publisher: name: arXiv
Year: 2011
Subjects: subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: Primary 39B42, 39B52, Secondary 20F99

description: Two natural extensions of Jensen's functional equation on the real line are the equations $f(xy)+f(xy^{-1}) = 2f(x)$ and $f(xy)+f(y^{-1}x) = 2f(x)$, where $f$ is a map from a multiplicative group $G$ into an abelian additive group $H$. In a series of papers \cite{Ng1}, \cite{Ng2}, \cite{Ng3}, C. T. Ng has solved these functional equations for the case where $G$ is a free group and the linear group $GL_n(R)$, $R=\z,\r$, a quadratically closed field or a finite field. He has also mentioned, without detailed proof, in the above papers and in \cite{Ng4} that when $G$ is the symmetric group $S_n$ the group of all solutions of these functional equations coincides with the group of all homomorphisms from $(S_n,\cdot)$ to $(H,+)$. The aim of this paper is to give an elementary and direct proof of this fact.
description: 8 pages, Abstract changed, the proof of Proposition 2.1 and Lemma 2.4 changed (minor), one reference added, final version, to be published in Aequationes Mathematicae (2011)
Exploring human dietary variation through stable isotope analysis of hair
Creators: name: Cooper, Catherine Grace
Publisher: name: University of British Columbia
Year: 2017

description: This thesis explores the use of carbon, nitrogen and sulphur stable isotope analysis of modern and archaeological human hair as an indicator of human diets. The thesis is focused around three distinct research projects, two on modern, living humans and one on an archaeological population. The first project focuses on dietary variation among different populations in modern Ethiopia that share the same resource base but follow different economic and subsistence patterns. This research shows that economic and cultural patterns can cause very distinct and significant differences in diet among populations with access to the same resources. The second project uses data from modern Nicaraguan villagers to explore variability in isotopic signatures among demographic groups within one population. The data reveal significant differences among demographic groups, but the absolute differences are quite small, indicating that it is necessary to have a large sample size to determine isotopic differences within a population. The third project is an archaeological case study presenting the first serial isotopic analysis of human hair from the Basketmaker II (BMII) midden at the site of Turkey Pen Ruins on Cedar Mesa, in south-eastern Utah. These data show potential seasonality of diet at the site, with variations in the amount of C₄ protein being contributed to the diet. Together these projects contribute to our understanding of how different scales of dietary variation can be interpreted and approached through isotopic analysis of human hair. The studies also show the applicability of both intra-individual and inter-individual isotopic analysis of human hair to our understanding of modern and ancient diets.
On light propagation in Swiss-Cheese cosmologies
Creators: name: Szybka, Sebastian J.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study the effect of inhomogeneities on light propagation. The Sachs equations are solved numerically in the Swiss-Cheese models with inhomogeneities modelled by the Lemaitre-Tolman solutions. Our results imply that, within the models we study, inhomogeneities may partially mimic the accelerated expansion of the Universe provided the light propagates through regions with lower than the average density. The effect of inhomogeneities is small and full randomization of the photons' trajectories reduces it to an insignificant level.
description: 27 pages, 11 figures; major changes
Menon's identity and arithmetical sums representing functions of several variables
Creators: name: Tóth, László
Publisher: name: arXiv
Year: 2011
Subjects: subject: Number Theory (math.NT)
subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 11A25, 11A07, 20D60, 20K27

description: We generalize Menon's identity by considering sums representing arithmetical functions of several variables. As an application, we give a formula for the number of cyclic subgroups of the direct product of several cyclic groups of arbitrary orders. We also point out extensions of Menon's identity in the one variable case, which seems to not appear in the literature.
description: 12 pages, revised
Comprehensive study of the critical behavior in the diluted antiferromagnet in a field
Creators: name: Fernandez, L. A.
name: Martin-Mayor, V.
name: Yllanes, D.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We study the critical behavior of the Diluted Antiferromagnet in a Field with the Tethered Monte Carlo formalism. We compute the critical exponents (including the elusive hyperscaling violations exponent $θ$). Our results provide a comprehensive description of the phase transition and clarify the inconsistencies between previous experimental and theoretical work. To do so, our method addresses the usual problems of numerical work (large tunneling barriers and self-averaging violations).
description: 4 pages, 2 figures
Gravitational Waves from Abelian Gauge Fields and Cosmic Strings at Preheating
Creators: name: Dufaux, Jean-Francois
name: Figueroa, Daniel G.
name: Garcia-Bellido, Juan
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Primordial gravitational waves provide a very important stochastic background that could be detected soon with interferometric gravitational wave antennas or indirectly via the induced patterns in the polarization anisotropies of the cosmic microwave background. The detection of these waves will open a new window into the early Universe, and therefore it is important to characterize in detail all possible sources of primordial gravitational waves. In this paper we develop theoretical and numerical methods to study the production of gravitational waves from out-of-equilibrium gauge fields at preheating. We then consider models of preheating after hybrid inflation, where the symmetry breaking field is charged under a local U(1) symmetry. We analyze in detail the dynamics of the system in both momentum and configuration space, and show that gauge fields leave specific imprints in the resulting gravitational wave spectra, mainly through the appearence of new peaks at characteristic frequencies that are related to the mass scales in the problem. We also show how these new features in the spectra correlate with string-like spatial configurations in both the Higgs and gauge fields that arise due to the appearance of topological winding numbers of the Higgs around Nielsen-Olesen strings. We study in detail the time evolution of the spectrum of gauge fields and gravitational waves as these strings evolve and decay before entering a turbulent regime where the gravitational wave energy density saturates.
description: This paper is dedicated to the memory of Lev Kofman. Added references and comments in Sec. III.B. Version accepted in PRD
Τεχνικές Βαθιάς Μάθησης στις Συναλλαγές Κρυπτονομισμάτων
Creators: name: Παπαδοπούλου, Αναστασία Χαράλαμπου
Publisher: name: Aristotle University of Thessaloniki
Year: 2023
Subjects: Βαθιά Ενισχυτική Μάθηση
Τεχνική Ανάλυση
Ομαδοποίηση Χρονοσειρών
Deep Reinforcement Learning
Technical Analysis
Time-Series Clustering

description: Σκοπός της διατριβής ήταν η μελέτη των κρυπτονομισμάτων και η εύρεση της κατάλληλης μεθόδου για την συναλλαγή τους, με σκοπό το μέγιστο κέδρος. Εφαρμόστηκαν μέθοδοι βαθιάς ενισχυτικής μάθησης για την συναλλαγή των κρυπτονομισμάτων, καθώς και προσεγγίσεις κατανεμημένης βαθιάς ενισχυτικής μάθησης. Επιπλεόν, πραγματοποιήθηκε τεχνική ανάλυση σε candlesticks δεδομένα κρυπτονομισμάτων. Επιπρόσθετα, έγινε προεπεξεργασία και ομαδοποίηση χρονοσειρών κρυπτονομισμάτων.
description: The aim of the present thesis was the study of cryptocurrencies and finding the appropriate method for their transaction, with the aim of maximum profit. Applied deep reinforcement learning methods for cryptocurrency trading, as well as distributed deep reinforcement learning approaches. Additionally, technical analysis was performed on candlesticks cryptocurrency data. Furthermore, cryptocurrency time-series were preprocessed and clustered.
A positivity-preserving high-order semi-Lagrangian discontinuous Galerkin scheme for the Vlasov-Poisson equations
Creators: name: Rossmanith, J. A.
name: Seal, D. C.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Numerical Analysis (math.NA)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: The Vlasov-Poisson equations describe the evolution of a collisionless plasma, represented through a probability density function (PDF) that self-interacts via an electrostatic force. One of the main difficulties in numerically solving this system is the severe time-step restriction that arises from parts of the PDF associated with moderate-to-large velocities. The dominant approach in the plasma physics community for removing these time-step restrictions is the so-called particle-in-cell (PIC) method, which discretizes the distribution function into a set of macro-particles, while the electric field is represented on a mesh. Several alternatives to this approach exist, including fully Lagrangian, fully Eulerian, and so-called semi-Lagrangian methods. The focus of this work is the semi-Lagrangian approach, which begins with a grid-based Eulerian representation of both the PDF and the electric field, then evolves the PDF via Lagrangian dynamics, and finally projects this evolved field back onto the original Eulerian mesh. In particular, we develop in this work a method that discretizes the 1+1 Vlasov-Poisson system via a high-order discontinuous Galerkin (DG) method in phase space, and an operator split, semi-Lagrangian method in time. Second-order accuracy in time is relatively easy to achieve via Strang operator splitting. With additional work, using higher-order splitting and a higher-order method of characteristics, we also demonstrate how to push this scheme to fourth-order accuracy in time. We show how to resolve all of the Lagrangian dynamics in such a way that mass is exactly conserved, positivity is maintained, and high-order accuracy is achieved. The Poisson equation is solved to high-order via the smallest stencil local discontinuous Galerkin (LDG) approach. We test the proposed scheme on several standard test cases.
description: 48 pages, 13 figures
Monte Carlo study of the critical properties of the three-dimensional 120-degree model
Creators: name: Wenzel, Sandro
name: Laeuchli, Andreas M.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We report on large scale finite-temperature Monte Carlo simulations of the classical $120^\circ$ or $e_g$ orbital-only model on the simple cubic lattice in three dimensions with a focus towards its critical properties. This model displays a continuous phase transition to an orbitally ordered phase. While the correlation length exponent $ν\approx0.665$ is close to the 3D XY value, the exponent $η\approx 0.15$ differs substantially from O(N) values. We also introduce a discrete variant of the $e_g$ model, called $e_g$-clock model, which is found to display the same set of exponents. Further, an emergent U(1) symmetry is found at the critical point $T_c$, which persists for $T
description: 13 pages, 6 figures
Herstellung von Hybrid-Nanomaterialien für biologische Anwendungen
Creators: name: Miljevic, Marko
Publisher: name: Karlsruhe
Year: 2014

description: Im Mittelpunkt dieser Dissertation steht die Preparation der photoaktiven, Radikale produzierenden TiO2 Nanomaterialien, die sowohl für Enzymaktivierung angewendet werden können, als auch programmierten Zelltod auslösen können.
Crossover from normal to anomalous diffusion in field-aligned dipolar systems
Creators: name: Jordanovic, Jelena
name: Klapp, Sabine H. L.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Using molecular dynamics simulations we investigate the translational dynamics of particles with dipolar interactions in homogenous external fields. For a broad range of concentrations, we find that the anisotropic, yet normal diffusive behavior characterizing weakly coupled systems becomes anomalous both parallel and perpendicular to the field at sufficiently high dipolar coupling and field strength. After the ballistic regime, chain formation first yields cage-like motion in all directions, followed by transient, mixed diffusive-superdiffusive behavior resulting from cooperative motion of the chains. The enhanced dynamics disappears only at higher densities close to crystallization.
Breaking parameter degeneracy in interacting dark energy models from observations
Creators: name: Xu, Xiao-Dong
name: He, Jian-Hua
name: Wang, Bin
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
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: We study the interacting dark energy model with time varying dark energy equation of state. We examine the stability in the perturbation formalism and the degeneracy among the coupling between dark sectors, the time-dependent dark energy equation of state and dark matter abundance in the cosmic microwave background radiation. Further we discuss the possible ways to break such degeneracy by doing global fitting using the latest observational data and we get a tight constraint on the interaction between dark sectors.
description: 8 pages, 6 figures, accepted for publication in Phys.Lett.B
Multipole moments for black objects in five dimensions
Creators: name: Tanabe, Kentaro
name: Ohashi, Seiju
name: Shiromizu, Tetsuya
Publisher: name: arXiv
Year: 2010
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In higher dimensions than four, conventional uniqueness theorem in asymptotically flat space-times does not hold, i.e., black objects can not be classified only by the mass, angular momentum and charge. In this paper, we define multipole moments for black objects and show that Myers-Perry black hole and black ring can be distinguished by quadrupole moments. This consideration gives us a new insight for the uniqueness theorem for black objects in higher dimensions.
description: 14 pages, 8 figures, published version in PRD
Flavor symmetry breaking in lattice QCD with a mixed action
Creators: name: Bar, Oliver
name: Golterman, Maarten
name: Shamir, Yigal
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We study the phase structure of mixed-action QCD with two Wilson sea quarks and any number of chiral valence quarks (and ghosts), starting from the chiral lagrangian. A priori, the effective theory allows for a rich phase structure, including a phase with a condensate made of sea and valence quarks. In such a phase, mass eigenstates would become admixtures of sea and valence fields, and pure-sea correlation functions would depend on the parameters of the valence sector, in contradiction with the actual setup of mixed-action simulations. Using that the spectrum of the chiral Dirac operator has a gap for nonzero quark mass we prove that spontaneous symmetry breaking of the flavor symmetries can only occur within the sea sector. This rules out a mixed condensate, and implies restrictions on the low-energy constants of the effective theory.
description: published version, minor corrections, Revtex, 19 pages
Effective local connectivity properties
Creators: name: Daniel, Dale
name: McNicholl, Timothy H.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Logic (math.LO)
subject: General Topology (math.GN)
subject: FOS: Mathematics
subject: 03F60, 30D55, 54D05, 54F15

description: We investigate, and prove equivalent, effective versions of local connectivity and uniformly local arcwise connectivity for connected and computably compact subspaces of Euclidean space. We also prove that Euclidean continua that are computably compact and effectively locally connected are computably arcwise connected.
description: Final version
Synchronization and entrainment of coupled circadian oscillators
Creators: name: Komin, Niko
name: Murza, Adrian C.
name: Hernandez-Garcia, Emilio
name: Toral, Raul
Publisher: name: arXiv
Year: 2010
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Circadian rhythms in mammals are controlled by the neurons located in the suprachiasmatic nucleus of the hypothalamus. In physiological conditions, the system of neurons is very efficiently entrained by the 24-hour light-dark cycle. Most of the studies carried out so far emphasize the crucial role of the periodicity imposed by the light dark cycle in neuronal synchronization. Nevertheless, heterogeneity as a natural and permanent ingredient of these cellular interactions is seemingly to play a major role in these biochemical processes. In this paper we use a model that considers the neurons of the suprachiasmatic nucleus as chemically-coupled modified Goodwin oscillators, and introduce non-negligible heterogeneity in the periods of all neurons in the form of quenched noise. The system response to the light-dark cycle periodicity is studied as a function of the interneuronal coupling strength, external forcing amplitude and neuronal heterogeneity. Our results indicate that the right amount of heterogeneity helps the extended system to respond globally in a more coherent way to the external forcing. Our proposed mechanism for neuronal synchronization under external periodic forcing is based on heterogeneity-induced oscillators death, damped oscillators being more entrainable by the external forcing than the self-oscillating neurons with different periods.
description: 17 pages, 7 figures
Inhomogeneities in the universe
Creators: name: Labini, Francesco Sylos
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Standard models of galaxy formation predict that matter distribution is statistically homogeneous and isotropic and characterized by (i) spatial homogeneity for r<10 Mpc/h, (ii) small-amplitude structures of relatively limited size (i.e., r<100) Mpc/h and (iii) anti-correlations for r > r_c ~ 150 Mpc/h (i.e., no structures of size larger than r_c). Whether or not the observed galaxy distribution is interpreted to be compatible with these predictions depend on the a-priori assumptions encoded in the statistical methods employed to characterize the data and on the a-posteriori hypotheses made to interpret the results. We present strategies to test the most common assumptions and we find evidences that, in the available samples, galaxy distribution is spatially inhomogeneous for r<100 Mpc/h but statistically homogeneous and isotropic. We conclude that the observed inhomogeneities pose a fundamental challenge to the standard picture of cosmology but they also represent an important opportunity which may open new directions for many cosmological puzzles.
description: 30 pages, 10 figures. Accepted for publication in Classical and Quantum Gravity special issue "Inhomogeneous Cosmological Models and Averaging in Cosmology". Important modifications have been done with respect to v1
The Experiences of Secondary School Transition for Deaf Children in Mainstream Education: A Participatory Research Approach
Creators: name: Taylor-Baptie, Emma
Publisher: name: University of East London
Year: 2021
Subjects: deaf
secondary school transition
pupil voice
participatory
person-centred practice

description: Background: Primary to secondary school transition is a distinct moment in a child’s education which often evokes feelings of anxiety, stress, and excitement. Most children adapt quickly and successfully to this transition following an initial decrease in wellbeing and attainment. However, for some children including those with special educational needs, the transition process is more challenging resulting in long-lasting negative consequences. The challenge of secondary school transition may be accentuated for deaf young people who often experience communication difficulties and barriers due to a lack of deaf awareness within society. Research has suggested the wellbeing of deaf young people in early secondary school is poor, yet a systematic literature review revealed no research investigating the experiences of transition to secondary school for this group of young people. Current research: This small-scale qualitative study aimed to empower deaf young people, investigating their experiences of transition from a mainstream primary school to a mainstream secondary school. Two deaf college-aged students were involved in designing the research and selecting the data collection techniques. Four deaf Key Stage Three students completed semi-structured interviews and ‘The Ideal School’ activity (a personal construct psychology technique). An adapted version of Interpretive Phenomenological Analysis to incorporate the analysis of drawings was used to analyse the data. Key findings: An idiographic approach is used to present the findings to represent the participant’s unique experiences of secondary school transition. A cross-case analysis was also completed which revealed five key themes: ‘Attachment’, ‘Challenges’, ‘Support’, ‘New Beginnings’ and ‘Equal Opportunities’. This study provides important implications for school staff supporting the transition of deaf young people, highlighting the significance of person-centred approaches. Support from a variety of individuals is seen as crucial in addition to familiarity and a nurturing and acoustically supportive school environment. Implications for Educational Psychologists and future research are considered.
Momentum-space engineering of gaseous Bose-Einstein condensates
Creators: name: Edwards, Mark
name: Benton, Brandon
name: Heward, Jeffrey
name: Clark, Charles W.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We show how the momentum distribution of gaseous Bose--Einstein condensates can be shaped by applying a sequence of standing-wave laser pulses. We present a theory, whose validity for was demonstrated in an earlier experiment [L.\ Deng, et al., \prl {\bf 83}, 5407 (1999)], of the effect of a two-pulse sequence on the condensate wavefunction in momentum space. We generalize the previous result to the case of $N$ pulses of arbitrary intensity separated by arbitrary intervals and show how these parameters can be engineered to produce a desired final momentum distribution. We find that several momentum distributions, important in atom-interferometry applications, can be engineered with high fidelity with two or three pulses.
description: 13 pages, 4 figures
Dark and visible matter with broken R-parity and the axion multiplet
Creators: name: Hasenkamp, Jasper
name: Kersten, Jörn
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: A small breaking of R-parity reconciles thermal leptogenesis, gravitino dark matter and primordial nucleosynthesis. We find that the same breaking relaxes cosmological bounds on the axion multiplet. Naturally expected spectra become allowed and bounds from late particle decays become so weak that they are superseded by bounds from non-thermal axion production. In this sense, the strong CP problem serves as an additional motivation for broken R-parity.
description: 13 pages + refs, 1 table, v2: refs added, minor changes in presentation, v3: refs added, added discussion of decays into Higgs and Higgsino, matches published version
Professionalität in der Sozialen Arbeit: Eine theoretische Herleitung von Merkmalen für Professionalität in der Sozialen Arbeit und eine Analyse des Beitrags der Hochschulen an die Herstellung von Professionalität.
Creators: name: Loeffel, Nils
Publisher: name: Zenodo
Year: 2021

description: Die vorliegende Master-Thesis befasst sich mit Professionalitat in der Sozialen Arbeit. Dabei wird der Frage nachgegangen, mit welchen Merkmalen sich Professionalitat beschreiben lasst und welchen Beitrag die Bachelorstudiengange in Sozialer Arbeit der Hochschulen Bern, Luzern und St. Gallen zur Herstellung von Professionalitat gemass diesen Merkmalen leisten. Auf der Grundlage der Professionstheorien von Ulrich Oevermann, Bernd Dewe & Hans- Uwe Otto sowie Fritz Schutze werden Merkmale fur Professionalitat in der Sozialen Arbeit theoretisch hergeleitet und ein Kategoriensystem fur die Analyse der Bachelorstudiengange entwickelt. Mit der strukturierenden Inhaltsanalyse nach Mayring werden die Curricula der Hochschulen Bern, Luzern und St. Gallen ausgewertet und die Inhalte den entwickelten Kategorien zugeordnet. Als Ergebnis liegen die beschriebenen Merkmale von Professionalitat sowie eine Synopse, die daruber Auskunft gibt, welche Aspekte von Professionalitat im Rahmen des Studiums an den drei Hochschulen ausgebildet werden, vor. Die Erkenntnisse aus der Analyse der Curricula werden diskutiert und liefern mit den ausgearbeiteten Merkmalen einen Diskursbeitrag zur Rolle der Hochschulausbildung und der Praxis bei der Herstellung von Professionalitat in der Sozialen Arbeit.
description: + Code Diss LU: hslusa masa + Fussnote: Master of Science in Sozialer Arbeit, Bern, Luzern, St. Gallen, 2021 + NL-Code: NLLUHSA202109
Boundary conditions of the RGE flow in the noncommutative geometry approach to particle physics and cosmology
Creators: name: Kolodrubetz, Daniel
name: Marcolli, Matilde
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We investigate the effect of varying boundary conditions on the renormalization group flow in a recently developed noncommutative geometry model of particle physics and cosmology. We first show that there is a sensitive dependence on the initial conditions at unification, so that, varying a parameter even slightly can be shown to have drastic effects on the running of the model parameters. We compare the running in the case of the default and the maximal mixing conditions at unification. We then exhibit explicitly a particular choice of initial conditions at the unification scale, in the form of modified maximal mixing conditions, which have the property that they satisfy all the geometric constraints imposed by the noncommutative geometry of the model at unification, and at the same time, after running them down to lower energies with the renormalization group flow, they still agree in order of magnitude with the predictions at the electroweak scale.
description: 18 pages LaTeX, 13 png figures
Recoiling Black Holes in Merging Galaxies: Relationship to AGN Lifetimes, Starbursts, and the M-sigma Relation
Creators: name: Blecha, Laura
name: Cox, Thomas J.
name: Loeb, Abraham
name: Hernquist, Lars
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Gravitational-wave (GW) recoil of merging supermassive black holes (SMBHs) may influence the co-evolution of SMBHs and their host galaxies. We examine this possibility using SPH/N-body simulations of gaseous galaxy mergers in which the merged BH receives a recoil kick. This enables us to follow recoiling BHs in self-consistent, evolving merger remnants. In contrast to recent studies on similar topics, we conduct a large parameter study, generating a suite of over 200 simulations with more than 60 merger models and a range of recoil velocities (vk). Our main results are as follows. (1) BHs kicked at nearly the central escape speed (vesc) may oscillate on large orbits for up to a Hubble time, but in gas-rich mergers, BHs kicked with up to ~ 0.7 vesc may be confined to the central few kpc of the galaxy, owing to gas drag and steep central potentials. (2) vesc in gas-rich mergers may increase rapidly during final coalescence, in which case trajectories may depend on the timing of the BH merger relative to the formation of the potential well. (3) Recoil events generally reduce the lifetimes of bright active galactic nuclei (AGN), but may actually extend AGN lifetimes at lower luminosities. (4) Kinematically-offset AGN (v > 800 km s^-1) may be observable for up to ~ 10 Myr either immediately after the recoil or during pericentric passages through a gas-rich remnant. (5) Spatially-offset AGN (R > 1 kpc) generally have low luminosities and lifetimes of ~ 1 - 100 Myr. (6) Rapidly-recoiling BHs may be up to ~ 5 times less massive than their stationary counterparts. This lowers the normalization of the M-sigma relation and contributes to both intrinsic and overall scatter. (7) Finally, the displacement of AGN feedback after a recoil event enhances central star formation rates, thereby extending the starburst phase of the merger and creating a denser stellar cusp. [Abridged.]
description: 30 pages, 18 figures. Accepted for publication in MNRAS
The transition between BL Lac objects and Flat Spectrum Radio Quasars
Creators: name: Ghisellini, G.
name: Tavecchio, F.
name: Foschini, L.
name: Ghirlanda, G.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We study the BL Lac objects detected in the one year all sky survey of the Fermi satellite, with a energy spectral slope alpha_gamma in the [0.1-100 GeV] band greater than 1.2. In the alpha_gamma vs gamma-ray luminosity plane, these BL Lacs occupy the region populated by Flat Spectrum Radio Quasars (FSRQs). Studying the properties of their spectral energy distributions (SED) and of their emitting lines, we find that several of these BL Lacs have a SED similar to FSRQs and that they do have broad lines of large equivalent width, and should be reclassified as FSRQs even adopting the current phenomenological definition (i.e. equivalent width EW of the emitting line greater than 5 A). In other cases, even if the EW width is small, the emitting lines can be as luminous as in quasars, and again their SED is similar to the SED of FSRQs. Sources classified as BL Lacs with a SED appearing as intermediate between BL Lacs and FSRQs also have relatively weak broad emission lines and small EW, and can be considered as transition sources. These properties are confirmed also by model fitting, that allows to derive the relevant intrinsic jet parameters and the jet power. This study leads us to propose a physical distinction between the two classes of blazars, based on the luminosity of the broad line region measured in Eddington units. The dividing line is of the order of L_BLR/L_Edd ~ 5e-4, in good agreement with the idea that the presence of strong emitting lines is related to a transition in the accretion regime, becoming radiatively inefficient below a disk luminosity of the order of one per cent of the Eddington one.
description: 17 pages, 13 figures, MNRAS, in press
Why are very short times so long and very long times so short in elastic waves?
Creators: name: Parravicini, Guido
name: Rigamonti, Serena
Publisher: name: arXiv
Year: 2010
Subjects: subject: Classical Physics (physics.class-ph)
subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: In a first study of thermoelastic waves, such as on the textbook of Landau and Lifshitz, one might at first glance understand that when the given period is very short, waves are isentropic because heat conduction does not set in, while if the given period is very long waves are isothermal because there is enough time for thermalization to be thoroughly accomplished. When one pursues the study of these waves further, by the mathematical inspection of the complete thermoelastic wave equation he finds that if the period is very short, much shorter than a characteristic time of the material, the wave is isothermal, while if it is very long, much longer than the characteristic time, the wave is isentropic. One also learns that this fact is supported by experiments: at low frequencies the elastic waves are isentropic, while they are isothermal when the frequencies are so high that can be attained in few cases. The authors show that there is no contradiction between the first glance understanding and the mathematical treatment of the elastic wave equation: for thermal effects very long periods are so short and very short periods are so long.
description: 7 pages, submitted to European Journal of Physics
The Critical End Point of Quantum Chromodynamics Detected by Chirally Imbalanced Quark Matter
Creators: name: Ruggieri, Marco
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We suggest the idea, supported by concrete calculations within chiral models, that the critical endpoint of the phase diagram of Quantum Chromodynamics with three colors can be detected, by means of Lattice simulations of grand-canonical ensembles with a chiral chemical potential, $μ_5$, conjugated to chiral charge density. In fact, we show that a continuation of the critical endpoint of the phase diagram of Quantum Chromodynamics at finite chemical potential, $μ$, to a critical end point in the temperature-chiral chemical potential plane, is possible. This study paves the way of the mapping of the phases of Quantum Chromodynamics at finite $μ$, by means of the phases of a fictitious theory in which $μ$ is replaced by $μ_5$.
description: List of changes: some reference added; chiral chemical potential better explained. Version to appear on Phys. Rev. D
Loop condensation in the triangular lattice quantum dimer model
Creators: name: Herdman, C. M.
name: Whaley, K. B.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the mechanism of loop condensation in the quantum dimer model on the triangular lattice. The triangular lattice quantum dimer model displays a topologically ordered quantum liquid phase in addition to conventionally ordered phases with broken symmetry. In the context of systems with extended loop-like degrees of freedom, the formation of such topological order can be described in terms of loop condensation. Using Monte Carlo calculations with local and directed-loop updates, we compute geometric properties of the transition graph loop distributions of several triangular lattice quantum dimer wavefunctions that display dimer-liquid to dimer-crystal transitions and characterize these in terms of loop condensation.
description: 22 pages, 12 figures, fixed references and minor typos
Synchronization of unidirectional time delay chaotic networks and the greatest common divisor
Creators: name: Kanter, I.
name: Zigzag, M.
name: Englert, A.
name: Geissler, F.
name: Kinzel, W.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: We present the interplay between synchronization of unidirectional coupled chaotic nodes with heterogeneous delays and the greatest common divisor (GCD) of loops composing the oriented graph. In the weak chaos region and for GCD=1 the network is in chaotic zero-lag synchronization, whereas for GCD=m>1 synchronization of m-sublattices emerges. Complete synchronization can be achieved when all chaotic nodes are influenced by an identical set of delays and in particular for the limiting case of homogeneous delays. Results are supported by simulations of chaotic systems, self-consistent and mixing arguments, as well as analytical solutions of Bernoulli maps.
description: 7 pages, 5 figures
General Embedded Brane Effective Field Theories
Creators: name: Goon, Garrett
name: Hinterbichler, Kurt
name: Trodden, Mark
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We present a new general class of four-dimensional effective field theories with interesting global symmetry groups. These theories arise from purely gravitational actions for (3+1)-dimensional branes embedded in higher dimensional spaces with induced gravity terms. The simplest example is the well known Galileon theory, with its associated Galilean symmetry, arising as the limit of a DGP brane world. However, we demonstrate that this is a special case of a much wider range of theories, with varying structures, but with the same attractive features such as second order equations. In some circumstances, these new effective field theories allow potentials for the scalar fields on curved space, with small masses protected by non-linear symmetries. Such models may prove relevant to the cosmology of both the early and late universe.
description: 4 pages, 1 figure, version appearing in PRL
Finite-temperature phase transition to $m=1/2$ plateau phase in a S=1/2 XXZ model on Shastry-Sutherland Lattices
Creators: name: Suzuki, T.
name: Sengupta, P.
name: Tomita, Y.
name: Kawashima, N.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study the finite-temperature transition to the $m=1/2$ magnetization plateau in a model of interacting $S=1/2$ spins with longer range interactions and strong exchange anisotropy on the geometrically frustrated Shastry-Sutherland lattice. This model was shown to capture the qualitative features of the field-induced magnetization plateaus in the rare-earth tetraboride, ${\rm TmB_4}$. Our results show that the transition to the plateau state occurs via two successive transitions with the two-dimensional Ising universality class, when the quantum exchange interactions are finite, whereas a single phase transition takes place in the purely Ising limit. To better understand these behaviors, we perform Monte Carlo simulations of the classical generalized four-state chiral clock model and compare the phase diagrams of the two models. Finally, we estimate a parameter set that can explain the magnetization curves observed in ${\rm TmB_4}$. The magnetic properties and critical behavior of the finite-temperature transition to the $m=1/2$ plateau state are also discussed.
description: 11 pages, 15 figures
Continuity of the Explosive Percolation Transition
Creators: name: Lee, Hyun Keun
name: Kim, Beom Jun
name: Park, Hyunggyu
Publisher: name: arXiv
Year: 2011
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The explosive percolation problem on the complete graph is investigated via extensive numerical simulations. We obtain the cluster-size distribution at the moment when the cluster size heterogeneity becomes maximum. The distribution is found to be well described by the power-law form with the decay exponent $τ= 2.06(2)$, followed by a hump. We then use the finite-size scaling method to make all the distributions at various system sizes up to $N=2^{37}$ collapse perfectly onto a scaling curve characterized solely by the single exponent $τ$. We also observe that the instant of that collapse converges to a well-defined percolation threshold from below as $N\rightarrow\infty$. Based on these observations, we show that the explosive percolation transition in the model should be continuous, contrary to the widely-spread belief of its discontinuity.
description: Some corrections during the review
A few remarks on the zero modes of the Faddeev-Popov operator in the Landau and maximal Abelian gauges
Creators: name: Guimaraes, M. S.
name: Sorella, S. P.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The construction outlined by Henyey is employed to provide examples of normalizable zero modes of the Faddeev-Popov operator in the Landau and maximal Abelian gauges in SU(2) Euclidean Yang-Mills theories in d=3 dimensions. The corresponding gauge configurations have all finite norm ||A||^2 < \infty. In particular, in the case of the Landau gauge, the explicit construction of an infinite class of normalizable zero modes with finite norm ||A||^2 is provided.
description: 9 pages. Extended discussion in the conclusions. Version accepted for publication in the J. Math. Phys