cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Irreversibility in a unitary finite-rate protocol: The concept of internal friction
Creators: name: Cakmak, Selcuk
name: Altintas, Ferdi
name: Mustecaplioglu, Ozgur E.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The concept of internal friction, a fully quantum mechanical phenomena, is investigated in a simple, experimentally accessible quantum system in which a spin-1/2 is driven by a transverse magnetic field in a quantum adiabatic process. The irreversible production of the waste energy due to the quantum friction is quantitatively analyzed in a forward-backward unitary transform of the system Hamiltonian by using the quantum relative entropy between the actual density matrix obtained in a parametric transformation and the one in a reversible adiabatic process. Analyzing the role of total transformation time and the different pulse control schemes on the internal friction reveal the non-monotone character of the internal friction as a function of the total protocol time and the possibility for almost frictionless solutions in finite-time transformations.
description: Submitted for publication
Exploring the nature of the Lyman-$α$ emitter CR7
Creators: name: Hartwig, Tilman
name: Latif, Muhammad A.
name: Magg, Mattis
name: Bromm, Volker
name: Klessen, Ralf S.
name: Glover, Simon C. O.
name: Whalen, Daniel J.
name: Pellegrini, Eric W.
name: Volonteri, Marta
Publisher: name: arXiv
Year: 2015
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: CR7 is the brightest Lyman-$α$ emitter observed at $z>6$, which shows very strong Lyman-$α$ and HeII 1640Å line luminosities, but no metal line emission. Previous studies suggest that CR7 hosts either young primordial stars with a total stellar mass of $\sim 10^7\,\mathrm{M}_\odot$ or a black hole of $\gtrsim 10^6\,\mathrm{M}_\odot$. Here, we explore different formation scenarios for CR7 with a semianalytical model, based on the random sampling of dark matter merger trees. We are unable to reproduce the observational constraints with a primordial stellar source, given our model assumptions, due to the short stellar lifetimes and the early metal enrichment. Black holes that are the remnants of the first stars are either not massive enough, or reside in metal-polluted haloes, ruling out this possible explanation of CR7. Our models instead suggest that direct collapse black holes, which form in metal-free haloes exposed to large Lyman-Werner fluxes, are more likely the origin of CR7. However, this result is derived under optimistic assumptions and future observations are necessary to further constrain the nature of CR7.
description: 21 pages, 17 figures, 2 tables, MNRAS in press
Off-shell higher spin N=2 supermultiplets in three dimensions
Creators: name: Kuzenko, Sergei M.
name: Ogburn, Daniel X.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Off-shell higher spin N=2 supermultiplets in three spacetime dimensions (3D) are presented in this paper. We propose gauge prepotentials for higher spin superconformal gravity and construct the corresponding gauge-invariant field strengths, which are proved to be conformal primary superfields. These field strengths are higher spin generalisations of the (linearised) N=2 super-Cotton tensor, which controls the superspace geometry of conformal supergravity. We also construct the higher spin extensions of the linearised N=2 conformal supergravity action. We provide two dually equivalent off-shell formulations for massless higher spin N=2 supermultiplets. They involve one and the same superconformal prepotential but differ in the compensators used. For the lowest superspin value 3/2, these higher spin series terminate at the linearised actions for the (1,1) minimal and w=-1 non-minimal N=2 Poincaré supergravity theories constructed in arXiv:1109.0496. Similar to the pure 3D supergravity actions, their higher spin counterparts propagate no degrees of freedom. However, the massless higher spin supermultiplets are used to construct off-shell massive N=2 supermultiplets by combining the massless actions with those describing higher spin extensions of the linearised N=2 conformal supergravity. We also demonstrate that every higher spin super-Cotton tensor can be represented as a linear superposition of the equations of motion for the corresponding massless higher spin supermultiplet,with the coefficients being higher-derivative linear operators.
description: 34 pages; V2: typos corrected, references and two appendices added, 42 pages; V3: abstract modified, references and comments added
Separazione d'immagini e filtraggio di Kalman
Creators: name: Reggiannini Marco
name: Bedini Luigi
name: Kuruoglu Ercan Engin
name: Salerno Emanuele
Publisher: name: Zenodo
Year: 2023

description: A signal processing technique for source separation in astrophysical data processing is described. In particular, we deal with the evaluation of the cosmic microwave background (CMB) and the estimation of its power spectrum. The multichannel observations available are considered as generated by a linear combination of three main radiation sources. One of the software codes developed to this purpose is based on generalized least squares (GLS). It requires the channel maps to share the same point spread function. Since the native data are measured through a telescope whose point spread function depends on frequency, the observed channel maps have been preliminarily smoothed in order to give them the same resolution (namely, the worst available in the original maps). The GLS-estimated CMB map is corrupted by an amplified measurement noise component, plus the residual interference from the astrophysical sources. In order to suppress interference, the CMB map has been treated by a 1D discrete Kalman filter. The Kalman-filtered map and the unfiltered GLS output have been deconvolved using the common point spread function, and their power spectra have been evaluated and compared to each other, and to the original CMB spectrum. Under this respect, the Kalman-filtered estimate has been found to be worse than its unfiltered counterpart. This is probably due to an inappropriate modeling of the signal dynamics used to build the Kalman filter
Small subgraphs in the trace of a random walk
Creators: name: Krivelevich, Michael
name: Michaeli, Peleg
Publisher: name: arXiv
Year: 2016
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05C81 (Primary), 05C80, 60G50 (Secondary)

description: We consider the combinatorial properties of the trace of a random walk on the complete graph and on the random graph $G(n,p)$. In particular, we study the appearance of a fixed subgraph in the trace. We prove that for a subgraph containing a cycle, the threshold for its appearance in the trace of a random walk of length $m$ is essentially equal to the threshold for its appearance in the random graph drawn from $G(n,m)$. In the case where the base graph is the complete graph, we show that a fixed forest appears in the trace typically much earlier than it appears in $G(n,m)$.
description: 20 pages, fixing some proofs in the previous version
Der Untergang Jerusalems - 587 oder 586 v. Chr. ?
Creators: name: Stoll, Claus-Dieter
Publisher: name: Jahrbuch für evangelikale Theologie
Year: 2025

description: 1820053199
description: Jahrbuch für evangelikale Theologie, V. 1 (1987): Jahrbuch für evangelikale Theologie, Band 1
title: João de Sousa Pinel
Creators: name: Correia, Jorge
name: Lopes, Ana
Publisher: name: CHAM, Faculdade de Ciências Sociais e Humanas, Universidade Nova de Lisboa
Year: 2022

description: Entrada histórica sobre pessoa João de Sousa Pinel na plataforma eViterbo
description: Correia, Jorge; Lopes, Ana. 2022. João de Sousa Pinel in eViterbo. CHAM, Faculdade de Ciências Sociais e Humanas, Universidade Nova de Lisboa. eISBN: 978-989-8492-77-7
Large thermoelectric power and figure of merit in a ferromagnetic-quantum dot-superconducting device
Creators: name: Hwang, Sun-Yong
name: Lopez, Rosa
name: Sanchez, David
Publisher: name: arXiv
Year: 2015
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We investigate the thermoelectric properties of a quantum dot coupled to ferromagnetic and superconducting electrodes. The combination of spin polarized tunneling at the ferromagnetic-quantum dot interface and the application of an external magnetic field that Zeeman splits the dot energy level leads to large values of the thermopower (Seebeck coefficient). Importantly, the thermopower can be tuned with an external gate voltage connected to the dot. We compute the figure of merit that measures the efficiency of thermoelectric conversion and find that it attains high values. We discuss the different contributions from Andreev reflection processes and quasiparticle tunneling into and out of the superconducting contact. Furthermore, we obtain dramatic variations of both the magnetothermopower and the spin Seebeck effect, which suggest that in our device spin currents can be controlled with temperature gradients only.
description: 9 pages, 6 figures
Heinrich Lips (1758-1817)
Creators: name: Veith, Johann Wilhelm
Publisher: name: Zentralbibliothek Zürich
Year: 1817
Subjects: subject: 760 Grafik, Druckgrafik, Drucke
subject: 920 Biografien, Genealogie, Insignien
subject: Nachruf
subject: Lips, Johann Heinrich
subject: Zürich
subject: Kloten

description: Enth: Heinrich Lips ; Auf den Tod des edlen Künstlers Heinrich Lips von Zürich
Considerazioni sull'errore di stima nel metodo FD-CCA
Creators: name: Reggiannini Marco
name: Bedini Luigi
name: Salerno Emanuele
Publisher: name: Zenodo
Year: 2023

description: In this report, we deal with the problem of separating spatially correlated sources in astrophysics. We present a source mixing model and a strategy to estimate the sources and the mixing parameters. We then present a detailed description of the error covariance matrices and the statistical properties of the noise in the spectral domain. Finally, we deal with the problem of evaluating the estimation error in the spectral indices and in the source cross-spectra, with emphasis on the difference we found between the estimated error values and the values obtained by numerical simulation. Some hypotheses on the causes of this difference are then formulated, and a heuristic correction strategy is proposed, based on a suitable multiplicative factor for the log-posterior of the spectral indices.
The Young George Higinbotham: 1826 – 1856
Creators: name: Moore, Geraldine Mary
Publisher: name: Monash University
Year: 2017
Subjects: Uncategorized

description: George Higinbotham was a highly influential Victorian colonial politician whose character and legacy are fiercely debated. Some historians admire him for his determination to achieve a just political system for Victoria based on his vision for a democratic and sovereign nation within the British Empire. Others regard him as a flawed character whose legacy was turmoil. The destruction of his papers after his death has left many gaps in our knowledge about his life. This thesis builds upon recent new research about his early life in Ireland, and by identifying his anonymous writing in the Melbourne Herald of 1854-56, discovers further significant life events that occurred during his first two years in Victoria. The thesis argues that the formative influences in Higinbotham’s life to age thirty explain his distinctive religious and political philosophy and the reforming agenda that underpinned his subsequent political career. While a journalist in London 1848-53, Higinbotham encountered the Philosophical Radical party and adopted their distinctive view about the devolution of power to colonial legislatures. The thesis reveals that, long before the commencement of his Parliamentary career, Higinbotham influenced the course of events in Victoria through his anonymous journalism. This happened with respect to the battle at Eureka, and a year later when a political storm erupted following Governor Hotham’s claim to unconstitutional powers. The thesis argues that Eureka and the Governor’s Minute – rather than the constitutional struggles of the 1860s – launched Higinbotham’s seventeen-year-long campaign to enshrine the principle of responsible government in the conduct of Victorian politics.
The role of the short range magnetic correlations on the gap opening of the topological Kondo insulators
Creators: name: Ramos, E.
name: Franco, R.
name: Silva-Valencia, J.
name: Foglio, M. E.
name: Figueira, M. S.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: In this work we investigate the effects of the short range magnetic correlations on the gap opening of the topological Kondo insulators. We consider an additional narrow band to the otherwise completely localized f-electrons, by adding a term to the periodic Anderson model which allows a small hopping of the localized electrons between neighboring sites of the lattice. This new model is adequate to study a novel class of intermetallic 4f and 5f orbitals materials: the Kondo topological insulators, whose paradigmatic material is the compound SmB6. For simplicity, we consider a version of the periodic Anderson model on a two dimensional square lattice. The starting point of the model is the 4f-Ce ions orbitals, with J=5/2 multiplet in the presence of spin-orbit coupling. We present results of the correlation functions and we show that the short range antiferromagnetic correlations favors the formation of magnetic moments on the atoms, and at the same time the existence of these moments opens the possibility of the spin-flip scattering by the conduction electrons, generating the Kondo effect, which contribute to the opening of a gap in the density of states of the system. We also calculate the phase diagram which shows that, as we vary the Ef level position from the empty regime to the Kondo regime, the system develops several phases: metallic, band insulator and Kondo topological insulator. The band structure calculated shows that the model develops a strong topological insulator.
description: Submitted to Journal Physics: Condensed Matter
title: Comparison of solar district heating and renovation of buildings as measures for decarbonization of heat supply in rural areas
Creators: name: Kelch, Jan
name: Kusyy, Oleg
name: Zipplies, Johannes
name: Orozaliev, Janybek
name: Vajen, Klaus
Publisher: name: Universität Kassel
Year: 2024
Subjects: subject: decarbonization
subject: energy efficient renovation
subject: existing buildings
subject: rural heating
subject: solar district heating
subject: 333
subject: 600
subject: Kohlenstoff
subject: Emissionsverringerung
subject: Energieeffizienz
subject: Modernisierung
subject: Wärmeversorgung
subject: Ländlicher Raum

description: Gefördert im Rahmen des Projekts DEAL
The novel metallic states of the cuprates: Fermi liquids with topological order, and strange metals
Creators: name: Sachdev, Subir
name: Chowdhury, Debanjan
Publisher: name: arXiv
Year: 2016
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: This article is based on a talk by S.S. at the Nambu Memorial Symposium at the University of Chicago. We review ideas on the nature of the metallic states of the hole-doped cuprate high temperature superconductors, with an emphasis on the connections between the Luttinger theorem for the size of the Fermi surface, topological quantum field theories (TQFTs), and critical theories involving changes in the size of the Fermi surface. We begin with the derivation of the Luttinger theorem for a Fermi liquid, using momentum balance during a process of flux-insertion in a lattice electronic model with toroidal boundary conditions. We then review the TQFT of the Z2 spin liquid, and demonstrate its compatibility with the toroidal momentum balance argument. This discussion leads naturally to a simple construction of `topological' Fermi liquid states: the fractionalized Fermi liquid (FL*) and the algebraic charge liquid (ACL). We present arguments for a description of the pseudogap metal of the cuprates using Z2-FL* or Z2-ACL states with Ising-nematic order. These pseudogap metal states are also described as Higgs phases of a SU(2) gauge theory. The Higgs field represents local antiferromagnetism, but the Higgs-condensed phase does not have long-range antiferromagnetic order: the magnitude of the Higgs field determines the pseudogap, the reconstruction of the Fermi surface, and the Ising-nematic order. Finally, we discuss the route to the large Fermi surface Fermi liquid via the critical point where the Higgs condensate and Ising nematic order vanish, and the application of Higgs criticality to the strange metal.
description: 34 pages, 11 figures; (v2) 35 pages. Expanded discussion of experiments and added citation to arXiv:1606.07813; (v4+5) Same as published version, but updated terminology on topological phases to align with general usage
title: João Filipe Bettendorff
Creators: name: Gomes Duarte, Cláudia
Publisher: name: CHAM, Faculdade de Ciências Sociais e Humanas, Universidade NOVA de Lisboa
Year: 2022

description: Entrada biográfica sobre João Filipe Bettendorff na plataforma eViterbo
description: Gomes, Cláudia Duarte. 2022. João Filipe Bettendorff. In eViterbo. CHAM, Faculdade de Ciências Sociais e Humanas, Universidade Nova de Lisboa. eISBN: 978-989-8492-77-7
Probing the Scale of New Physics by Advanced LIGO/VIRGO
Creators: name: Dev, P. S. Bhupal
name: Mazumdar, A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We show that if the new physics beyond the Standard Model is associated with a first-order phase transition around $10^7-10^8$ GeV, the energy density stored in the resulting stochastic gravitational waves and the corresponding peak frequency are within the projected final sensitivity of the advanced LIGO/VIRGO detectors. We discuss some possible new physics scenarios that could arise at such energies, and in particular, the consequences for Peccei-Quinn and supersymmetry breaking scales.
description: 8 pages, 1 figure; version to appear in Phys. Rev. D
Museums between Enlightenment and Romanticism. Early nineteenth century roots and modern practices
Creators: name: Keurs, Pieter Ter
Publisher: name: International Committee for University Museums and Collections (UMAC)
Year: 2011
Subjects: subject: Collecting
subject: Enlightenment
subject: Romanticism
subject: 060 Organisationen, Museumswissenschaft

description: The early history of the three large National Museums in Leiden, the Netherlands, is characterized by Enlightenment principles such as education, instruction and foremost rationalism. However, it would be a mistake to think that the history of these museums can be adequately described by referring to enlightened, rationalist ideas only. Partly as a reaction on enlightened rationalism the Romantic movement developed at the end of the eighteenth century. It is argued that the nineteenth century history of the three large national museums in Leiden can best be understood as a process influenced both by reason and structure as well as by irrationality and ‘the absence of structure’. It is most likely that modern museum practices are also influenced by the two strong European intellectual movements mentioned above. The case of the Golden Helmet, a Roman helmet found in 1910 in the swamp of the Peel region, serves as an example of how old museums can learn from their own past and apply these lessons to present-day museum practices. In collecting, exhibiting and cooperation with local partners, it is better to acknowledge a tension between reason and emotion, instead of a development towards more rationalism.
Editorial: Assessment and National Exams in Social Studies and Social Sciences
Creators: name: Löfström, Jan
name: Rosenlund, David
name: Weber, Birgit
Publisher: name: JSSE - Journal of Social Science Education
Year: 2023

description: In the Introduction are outlined some central questions relating to why there has been increased interest toward assessment, evaluation and testing in educational policy in the last 30 years, and what effect this may have had on pedagogy. In the Introduction attention is drawn to the both negative and positive potential that there is in the new emphasising of student assessment.
description: JSSE - Journal of Social Science Education, Bd. 22 Nr. 2 (2023): Assessment and National Exams in Social Studies and Social Sciences
Kinematische Tätigkeitsanalyse : Identifikation von ruckbasierten Parametern zur Ermittlung der Anstrengung am Beispiel einer repetitiven Punkt-zu-Punkt Bewegung
Creators: name: Bringeland, Sabrina
Publisher: name: KIT Scientific Publishing
Year: 2022
Subjects: Ruck
körperliche Beanspruchung
Anstrengung
Ergonomie
Arbeitsplatzgestaltung
repetitive Tätigkeiten
Arbeitswissenschaft
Jerk
physical exertion
perceived exertion
ergonomics
workplace design
repetition task
human factors

description: Die Bewertung der wahrgenommenen Anstrengung ist für die Gestaltung von Arbeitsplätzen von großer Bedeutung. Der vorliegende Ansatz stellt eine objektive Methode auf Grundlage kinematischer Daten dar. Ziel der Methode war es, die zeitlichen Ableitung der Beschleunigung - der Ruck - als Indikator für den Zeitpunkt erhöhter Anstrengung (ZEA) zu untersuchen. Die Ergebnisse zeigen, dass die Höhe und die Häufigkeit der Spitzen der Ruckdaten nützliche Indikatoren für die Identifizierung des ZEA sind.
An observationally-driven kinetic approach to coronal heating
Creators: name: Moraitis, K.
name: Toutountzi, A.
name: Isliker, H.
name: Georgoulis, M.
name: Vlahos, L.
name: Chintzoglou, G.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Coronal heating through the explosive release of magnetic energy remains an open problem in solar physics. Recent hydrodynamical models attempt an investigation by placing swarms of 'nanoflares' at random sites and times in modeled one-dimensional coronal loops. We investigate the problem in three dimensions, using extrapolated coronal magnetic fields of observed solar active regions. We apply a nonlinear force-free field extrapolation above an observed photospheric magnetogram of NOAA active region (AR) 11158. We then determine the locations, energy contents, and volumes of 'unstable' areas, namely areas prone to releasing magnetic energy due to locally accumulated electric current density. Statistical distributions of these volumes and their fractal dimension are inferred, investigating also their dependence on spatial resolution. Further adopting a simple resistivity model, we infer the properties of the fractally distributed electric fields in these volumes. Next, we monitor the evolution of 10^5 particles (electrons and ions) obeying an initial Maxwellian distribution with a temperature of 10 eV, by following their trajectories and energization when subjected to the resulting electric fields. For computational convenience, the length element of the magnetic-field extrapolation is 1 arcsec, much coarser than the particles collisional mean free path in the low corona. The presence of collisions traps the bulk of the plasma around the unstable volumes, or current sheets (UCS), with only a tail of the distribution gaining substantial energy. Assuming that the distance between UCS is similar to the collisional mean free path we find that the low active-region corona is heated to 100-200 eV, corresponding to temperatures exceeding 2 MK, within tens of seconds for electrons and thousands of seconds for ions. Fractally distributed, nanoflare-triggening fragmented UCS ...
description: accepted by A&A
Laboratori di cittadinanza digitale integrata e sostenibilità. Proposte di Unità di Apprendimento disciplinari e digitali per la secondaria di primo grado [Integrated digital citizenship and sustainability workshops. Proposals for disciplinary and digital learning units for lower secondary school]
Creators: name: Bombardelli, Olga
name: Codato, Marta
Publisher: name: JSSE - Journal of Social Science Education
Year: 2023

description: JSSE - Journal of Social Science Education, Bd. 22 Nr. 2 (2023): Assessment and National Exams in Social Studies and Social Sciences
The Term Processor Kimwitu++
Creators: name: Löwis, Martin Von
name: Piefel, Michael
Publisher: name: Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät II
Year: 2002
Subjects: subject: Compiler
subject: Abstract Syntax
subject: Unparsing
subject: Rewriting
subject: 004 Informatik

description: Compiler builders have for a long time used tools that automate the frontend process of scanning and parsing the input. However, tools to handle the result of the parse are rarely found. Kimwitu++, the term processor, is an extension to the C++ language which eases the production of programs that operate on trees or terms, and as such is a tool which is well suited for this purpose. This paper presents an overview of Kimwitu++ with its different techniques such as rewriting and unparsing as well as some sample applications where we put it to use.
Synthetic Frequency Protocol in the Ramsey Spectroscopy of Clock Transitions
Creators: name: Yudin, V. I.
name: Taichenachev, A. V.
name: Basalaev, M. Yu.
name: Zanon-Willette, T.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Instrumentation and Detectors (physics.ins-det)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We develop an universal method to significantly suppress probe-induced shifts in any types of atomic clocks using the Ramsey spectroscopy. Our approach is based on adaptation of the synthetic frequency concept [V. I. Yudin, et al., Phys. Rev. Lett. 107, 030801 (2011)] (previously developed for BBR shift suppression) to the Ramsey spectroscopy with the use of interrogations for different dark time intervals. Universality of the method consists in arbitrariness of the possible Ramsey schemes. However, most extremal results are obtained in combination with so-called hyper-Ramsey spectroscopy [V. I. Yudin, et al., Phys. Rev. A 82, 011804(R) (2010)]. In the latter case, the probe-induced frequency shifts can be suppressed considerably below a fractional level of 10$^{-18}$ practically for any optical atomic clocks, where this shift previously was metrologically significant. The main advantage of our method in comparison with other radical hyper-Ramsey approaches [R. Hobson, et al., Phys. Rev. A 93, 010501(R) (2016); T. Zanon-Willette, et al., Phys. Rev. A 93, 042506 (2016)] consist in much greater efficiency and resistibility in the presence of decoherentization.
description: 9 pages, 7 figures
Entanglement in the Quantum Hall Matrix Model
Creators: name: Frenkel, A
name: Hartnoll, SA
Publisher: name: Apollo - University of Cambridge Repository
Year: 2022
Subjects: Regular Article - Theoretical Physics
M(atrix) Theories
Chern-Simons Theories
Matrix Models
Non-Commutative Geometry

description: Abstract Characterizing the entanglement of matrix degrees of freedom is essential for understanding the holographic emergence of spacetime. The Quantum Hall Matrix Model is a gauged U(N ) matrix quantum mechanics with two matrices whose ground state is known exactly and describes an emergent spatial disk with incompressible bulk dynamics. We define and compute an entanglement entropy in the ground state associated to a cut through the disk. There are two contributions. A collective field describing the eigenvalues of one of the matrices gives a gauge-invariant chiral boundary mode leading to an expected logarithmic entanglement entropy. Further, the cut through the bulk splits certain ‘off-diagonal’ matrix elements that must be duplicated and associated to both sides of the cut. Sewing these duplicated modes together in a gauge-invariant way leads to a bulk ‘area law’ contribution to the entanglement entropy. All of these entropies are regularized by finite N.
Revisiting van der Waals like behavior of f(R) AdS black holes via the two point correlation function
Creators: name: Mo, Jie-Xiong
name: Li, Gu-Qiang
name: Lin, Ze-Tao
name: Zeng, Xiao-Xiong
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Van der Waals like behavior of $f(R)$ AdS black holes is revisited via two point correlation function, which is dual to the geodesic length in the bulk. The equation of motion constrained by the boundary condition is solved numerically and both the effect of boundary region size and $f(R)$ gravity are probed. Moreover, an analogous specific heat related to $δL$ is introduced. It is shown that the $T-δL$ graphs of $f(R)$ AdS black holes exhibit reverse van der Waals like behavior just as the $T-S$ graphs do. Free energy analysis is carried out to determine the first order phase transition temperature $T_*$ and the unstable branch in $T-δL$ curve is removed by a bar $T=T_*$. It is shown that the first order phase transition temperature is the same at least to the order of $10^{-10}$ for different choices of the parameter $b$ although the values of free energy vary with $b$. Our result further supports the former finding that charged $f(R)$ AdS black holes behave much like RN-AdS black holes. We also check the analogous equal area law numerically and find that the relative errors for both the cases $θ_0=0.1$ and $θ_0=0.2$ are small enough. The fitting functions between $ \log\mid T -T_c\mid$ and $\log\midδL-δL_c\mid $ for both cases are also obtained. It is shown that the slope is around 3, implying that the critical exponent is about $2/3$. This result is in accordance with those in former literatures of specific heat related to the thermal entropy or entanglement entropy.
description: Revised version. Match the published version. 14pages,5figures
Financial education as a social studies discipline: the equivocality of the critical aspirations found in Québec’s curriculum and its educational materials
Creators: name: Lefrançois, David
name: Éthier, Marc-André
name: Cambron-Prémont, Amélie
name: Larocque, Stéphanie
Publisher: name: JSSE - Journal of Social Science Education
Year: 2023

description: Purpose: In 2017, the Government of Québec made a high school financial education course compulsory. Anchored in the social studies, it tackles themes like consumer rights, savings, and employment. This paper strives to understand the types of citizenship education they promote. Design/methodology/approach: Our research is based on a content analysis of Québec’s financial education curriculum and its textbooks. Findings: This paper reveals that Ministry approved educational materials focus on issues of personal finance and information retrieval tasks at the expense of a critical approach and tasks of a higher intellectual value. Québec’s financial education materials therefore seems to foster personally responsible citizens. Research limitations/implications: To understand the use teachers and students make of financial education materials, we must now conduct individual and group interviews with teachers and students, but mostly authentic classroom observations.
description: JSSE - Journal of Social Science Education, Bd. 22 Nr. 2 (2023): Assessment and National Exams in Social Studies and Social Sciences
Unified description of seagull cancellations and infrared finiteness of gluon propagators
Creators: name: Aguilar, A. C.
name: Binosi, D.
name: Figueiredo, C. T.
name: Papavassiliou, J.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present a generalized theoretical framework for dealing with the important issue of dynamical mass generation in Yang-Mills theories, and, in particular, with the infrared finiteness of the gluon propagators, observed in a multitude of recent lattice simulations. Our analysis is manifestly gauge-invariant, in the sense that it preserves the transversality of the gluon self-energy, and gauge-independent, given that the conclusions do not depend on the choice of the gauge-fixing parameter within the linear covariant gauges. The central construction relies crucially on the subtle interplay between the Abelian Ward identities satisfied by the nonperturbative vertices and a special integral identity that enforces a vast number of 'seagull cancellations' among the one- and two-loop dressed diagrams of the gluon Schwinger-Dyson equation. The key result of these considerations is that the gluon propagator remains rigorously massless, provided that the vertices do not contain (dynamical) massless poles. When such poles are incorporated into the vertices, under the pivotal requirement of respecting the gauge symmetry of the theory, the terms comprising the Ward identities conspire in such a way as to still enforce the total annihilation of all quadratic divergences, inducing, at the same time, residual contributions that account for the saturation of gluon propagators in the deep infrared.
description: 40 pages, 7 figures; v2: typos corrected, version matching the published one
Instability of three-band Tomonaga-Luttinger liquid: renormalization group analysis and possible application to K2Cr3As3
Creators: name: Miao, Jian-Jian
name: Zhang, Fu-Chun
name: Zhou, Yi
Publisher: name: arXiv
Year: 2016
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Motivated by recently discovered quasi-one-dimensional superconductor K$_{2}$Cr$_{3}$As$_{3}$ with $D_{3h}$ lattice symmetry, we study one-dimensional three-orbital Hubbard model with generic electron repulsive interaction described by intra-orbital repulsion $U$, inter-orbital repulsion, and Hund's coupling $J$. As extracted from density functional theory calculation, two of the three atomic orbitals are degenerate ($E^{\prime}$ states) and the third one is non-degenerate ($A^{\prime}_1$), and the system is presumed to be at an incommensurate filling. With the help of bosonization, we have usual three-band Tomonaga-Luttinger liquid for the normal state. Possible charge density wave (CDW), spin density wave (SDW) and superconducting (SC) instabilities are analyzed by renormalization group. The ground state depends on the ratio $J/U$ and is sensitive to the degeneracy of $E^{\prime}$ bands. At $0U/2$. When the two-fold degeneracy of $E^{\prime}$ bands is lifted, SDW instability has the tendency to dominate over the spin-singlet SC state at $0
description: two more appendices are added
Civics teachers’ assessment practices in Swedish upper secondary schools: A qualitative study.
Creators: name: Jansson, Tobias
Publisher: name: JSSE - Journal of Social Science Education
Year: 2023

description: Highlights: • Civics teachers assess a broad content, but there are some core areas. • Different cognitive skills are measured focusing on reasoning skills, characterizing Civics. • Teachers use a variety of methods, though written assignments are most common. • Contextual factors and teachers’ beliefs strongly affect teacher agency in assessment Purpose: The aim is to qualitatively explore Civics teachers’ assessment decisions regarding content, skills, and methods in Swedish upper secondary schools. Methodology: Thematic analyses of assignments and interviews of thirteen Civics teachers in Swedish upper secondary school. Findings: The open Swedish curriculum and Civics syllabus enables teacher agency in assessment decisions and teachers do not find it necessary to assess all content. The thirteen teachers varied their assessment methods, which are mainly chosen from rationales other than measured content and skills. Teacher agency in assessment decisions is affected by teachers’ experiences and beliefs, Civics canonic traditions, and context, rather than education or curricular demands, except for a performative discourse focusing on grades. Research limitations/implications: Though limited to a small sample in Swedish upper secondary schools and Civics, findings may be applicable in similar open/flexible subjects and similar national contexts.
description: JSSE - Journal of Social Science Education, Bd. 22 Nr. 2 (2023): Assessment and National Exams in Social Studies and Social Sciences
Parameter estimation in a subcritical percolation model with colouring
Creators: name: Beck, Felix
name: Mélykúti, Bence
Publisher: name: arXiv
Year: 2016
Subjects: subject: Statistics Theory (math.ST)
subject: Probability (math.PR)
subject: Quantitative Methods (q-bio.QM)
subject: FOS: Mathematics
subject: FOS: Biological sciences
subject: 62F10 (primary), 60K35 (secondary)

description: In the bond percolation model on a lattice, we colour vertices with $n_c$ colours independently at random according to Bernoulli distributions. A vertex can receive multiple colours and each of these colours is individually observable. The colours colour the entire component into which they fall. Our goal is to estimate the $n_c +1$ parameters of the model: the probabilities of colouring of single vertices and the probability with which an edge is open. The input data is the configuration of colours once the complete components have been coloured, without the information which vertices were originally coloured or which edges are open. We use a Monte Carlo method, the method of simulated moments to achieve this goal. We prove that this method is a strongly consistent estimator by proving a uniform strong law of large numbers for the vertices' weakly dependent colour values. We evaluate the method in computer tests. The motivating application is cross-contamination rate estimation for digital PCR in lab-on-a-chip microfluidic devices.
description: 32 pages, 7 figures. Proof of uniform law of large numbers and numerical evidence of identifiability added. Numerical testing redone. Code available at https://github.com/Melykuti/Parameterestimation_MSM
Testing economic literacy: an overview of measurement instruments of the past 30 years
Creators: name: Welsandt, Nina
name: Abs, Hermann Josef
Publisher: name: JSSE - Journal of Social Science Education
Year: 2023

description: Keywords: Systematic review, economic literacy, measurement instruments • Measurement instruments often represent only one domain at a time. • The focus of test instruments is on querying declarative knowledge. • Authentic assessments are rarely being used. Purpose: This paper analyses and classifies currently available English- and German-language measurement instruments for assessing economic literacy. It shows the content-related focuses and gaps of the extracted test instruments, the cognitive level of demand that characterises the instruments, the technical forms of implementation, and the extent to which the lifeworld contexts of test participants were considered. Method: The PSYNDEX, ERIC, German Education Index, and GESIS databases were systematically reviewed, and measurement instruments were examined based on four perspectives of analysis: economic subject dimension, learning psychology, assessment formats and technical design, and authenticity. Findings: Knowledge tests differ substantially from each other. Rather than representing all domains of the subject of economics equally, test instruments usually measure only one domain at a time. The focus of test instruments is on the retrieval of declarative knowledge. Measurement instruments were developed for adults and young people in equal parts. While some test instruments are related to the real world, authentic assessments are an exception.
description: JSSE - Journal of Social Science Education, Bd. 22 Nr. 2 (2023): Assessment and National Exams in Social Studies and Social Sciences
Die Erfahrung der Führung durch den Heiligen Geist
Creators: name: Liebscher, Siegfried
Publisher: name: Jahrbuch für evangelikale Theologie
Year: 2025

description: 1820052494
description: Jahrbuch für evangelikale Theologie, V. 1 (1987): Jahrbuch für evangelikale Theologie, Band 1
Interaction Cross Sections and Survival Rates for Proposed Solar System Member Planet Nine
Creators: name: Li, Gongjie
name: Adams, Fred C.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Motivated by the report of a possible new planetary member of the Solar System, this work calculates cross sections for interactions between passing stars and this proposed Planet Nine. Evidence for the new planet is provided by the orbital alignment of Kuiper Belt objects, and other Solar System properties, which suggest a Neptune-mass object on an eccentric orbit with semimajor axis $a_9\approx400-1500$ AU. With such a wide orbit, Planet Nine has a large interaction cross section, and is susceptible to disruption by passing stars. Using a large ensemble of numerical simulations (several million), and Monte Carlo sampling, we calculate the cross sections for different classes of orbit-altering events: [A] scattering the planet into its proposed orbit from a smaller orbit, [B] ejecting it from the Solar System from its current orbit, [C] capturing the planet from another system, and [D] capturing a free-floating planet. Results are presented for a range of orbital elements with planetary mass $m_9=10M_{earth}$. Removing Planet Nine from the Solar System is the most likely outcome. Specifically, we obtain ejection cross sections $σ_{int}\sim5\times10^6$ AU$^2$ ($5\times10^4$ AU$^2$) for environments corresponding to the birth cluster (field). With these cross sections, Planet Nine is likely to be ejected if the Sun resides within its birth cluster longer than $Δ{t} \gtrsim 100$ Myr. The probability of ejecting Planet Nine due to passing field stars is $\lesssim 3\%$ over the age of the Sun. Probabilities for producing the inferred Planet Nine orbit are low $(\lesssim 5\%)$.
description: 16 pages, 3 figures Accepted for publication in ApJL
Measuring citizenship competences: Assessment of measurement invariance
Creators: name: Hoek, Lianne
name: Zijlstra, Bonne
name: Munniksma, Anke
name: Dijkstra, Anne Bert
Publisher: name: JSSE - Journal of Social Science Education
Year: 2023

description: Highlights: • Standardised questionnaires are used to measure the outcomes of citizenship education. • A prerequisite for cross-group comparisons based on these questionnaires is an assessment of measurement invariance. • This study used data from 6035 students from 87 Dutch primary schools to examine the measurement invariance of citizenship knowledge, attitude, and skill across sex, socioeconomic position and migration background. • The measurement invariance was sufficient in most cases. • Periodic assessment of measurement invariance in instruments measuring citizenship competences is important due to the dynamic nature of the construct. Purpose: Standardised questionnaires are used to measure the outcomes of citizenship education. These outcomes are often compared across groups to document different outcomes, for example, between boys and girls. A prerequisite for cross-group comparisons is an assessment of measurement invariance. Methodology: This study used data from 6035 students from 87 Dutch primary schools to examine the measurement invariance of the Citizenship Competences Questionnaire (Ten Dam et al., 2011). Dutch schools use this questionnaire to gain insight into students’ citizenship knowledge, attitudes, and skills. Measurement invariance was assessed across sex, socioeconomic position, and migration background. Findings: Measurement invariance was sufficient in most cases, allowing for cross-group comparisons of associations between latent constructs and their indicators, and in some cases, for cross-group comparisons of the latent means. We conclude by emphasising that periodic assessment of measurement invariance in instruments measuring citizenship competences is important due to the dynamic nature of the construct.
description: JSSE - Journal of Social Science Education, Bd. 22 Nr. 2 (2023): Assessment and National Exams in Social Studies and Social Sciences
Few remarks on the Higgs boson decays in gauge-Higgs unification
Creators: name: Hasegawa, K.
name: Lim, C. S.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In the scenario of gauge-Higgs unification, the origin of the Higgs boson is higher dimensional gauge boson. Reflecting its origin, very characteristic predictions are made of the Higgs boson interactions in this scenario. Especially, a remarkable claim has been made: the contribution of non-zero Kaluza-Klein modes to the Higgs decay $H \to Z γ$ exactly vanishes in the minimal SU(3) electro-weak unified model, at least at the one-loop level. In this brief report, in order to see whether this prediction is a general feature of the scenario or the consequence of the specific choice of the model, matter content or the order of perturbative expansion, we perform an operator analysis. We demonstrate that there does not exist any relevant operator, respecting the gauge symmetry SU(3) in the bulk. We also comment on the possibly important contribution to the photonic decay $H \to γγ$ due to the non-zero Kaluza-Klein modes of light quarks.
description: 15 pages, published version at PRD