cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Screened extended Koopmans' theorem: photoemission at weak and strong correlation
Creators: name: Di Sabatino, S.
name: Koskelo, J.
name: Berger, J. A.
name: Romaniello, P.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: By introducing electron screening in the extended Koopmans' theorem we correctly describe the band gap opening in weakly as well as strongly correlated systems. We show this by applying our method to bulk LiH, Si, and paramagnetic as well as antiferromagnetic NiO. Although incorrect features remain in the full photoemission spectra, this is a remarkable result for an ab-initio electronic structure method and it opens the way to a unified description of photoemission spectra at weak and strong correlation.
A giant umbrella-like stellar stream around the tidal ring galaxy NGC 922
Creators: name: Martinez-Delgado, David
name: Roca-Fabrega, Santi
name: Miro-Carretero, Juan
name: Gomez-Flechoso, Maria Angeles
name: Roman, Javier
name: Donatiello, Giuseppe
name: Schmidt, Judy
name: Lang, Dustin
name: Akhlaghi, Mohammad
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Tidal ring galaxies are observed rarely in the local universe due to their intrinsically transient nature. The tidal ring structures are the result of strong interactions between gas-rich stellar disks and smaller galactic systems and do not last longer than ~500~Myr therefore, these are perfect scenarios where to find the debris of recently accreted dwarf galactic systems. We present new deep images of the NGC 922 tidal ring galaxy and its surroundings from the DESI Legacy survey data and from our observations with an amateur telescope. These observations are compared with results from high-resolution N-body simulations designed to reproduce an alternative formation scenario for this peculiar galaxy. Our new observations unveil that the low surface brightness stellar tidal structures around NGC 922 are much more complex than reported in previous works. In particular, the formerly detected tidal spike-like structure at the northeast of the central galaxy disk is not connected with the dwarf companion galaxy PGC3080368, which has been suggested as the intruder triggering the ring formation of NGC 922. The deep images reveal that this tidal structure is mainly composed by a fainter giant umbrella-like shape and thus it was formed from the tidal disruption of a different satellite. Using the broad-band g, r and z DESI LS images, we measured the photometric properties of this stellar stream, estimating a total absolute magnitude in r-band of Mr= -17.0 +/- 0.03 magn and a total stellar mass for the stream between 6.9-8.5X10^8 Mo. We perform a set of N-body simulations to reproduce the observed NGC 922-intruder interaction, suggesting a new scenario for the formation of its tidal ring from the in-fall of a gas rich satellite around 150 Myr ago.
description: 8 Pages, 4 figures, submitted to Astronomy & Astrophysics
The role of enforcement strategy in disclosure regulations
Creators: name: Choi, Ka Wai
Publisher: name: Macquarie University
Year: 2022
Subjects: Other education not elsewhere classified

description: The advanced world has witnessed significant increases in securities regulation in recent years. Regulators and academics have shown overwhelming agreement on the importance of enforcement in delivering desirable regulatory outcomes. However, the question of what constitute effective enforcement is less clear. Borrowing from the law and economics literature, this thesis posits that a regulator's enforcement strategy is an important factor in effective enforcement. Focusing on the responsive enforcement strategy (Ayres and Braithwaite 1992), one of the most established and applied enforcement strategies, this thesis examines the impacts of the adoption by the Australian regulator of the strategy of corporate compliance with its continuous disclosure regulations. With compliance inferred from changes in the analysts' information environment and in market liquidity, results show that after full adoption of the responsive enforcement strategy, analysts' forecast error and forecast dispersion is incrementally reduced. In addition, as implied in analysts' forecasts (Barron et al. 1998), the precision of and analysts' reliance on public information have incrementally increased. With respect to market liquidity, a difference-in-difference approach is applied to control for influences from concurrent technological and economic developments. Benchmarking with the New Zealand market, bid-ask spread (turnover rate) has shown significant decreases (increases) as the strategy was being implemented. The improvements found in analysts' information and market liquidity are consistent with the strategy being successful in enhancing corporate compliance with the continuous disclosure requirements. The findings extend the enforcement literature and inform regulators by demonstrating the importance of devising an appropriate enforcement strategy for securing compliance and favorable regulatory outcomes.
Polarization jumps by breaking symmetries of two-dimensional Weyl semimetals
Creators: name: Yoshida, Hiroki
name: Zhang, Tiantian
name: Murakami, Shuichi
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The electric polarization as a bulk quantity is described by the modern theory of polarization in insulating systems and cannot be defined in conducting systems. Upon a gradual change of a parameter in the system, the polarization always varies smoothly as long as the gap remains open. In this paper, we focus on the two-dimensional Weyl semimetal, which hosts Weyl nodes protected by symmetries, and study the behavior of the polarization when a symmetry-breaking term $M$ is introduced and a gap opens. We show that there can be a jump between $M\to0^+$ and $M\to0^-$ limits. We find that the jump is universally described by the ``Weyl dipole" representing how the Weyl nodes with monopole charges are displaced in the reciprocal space. Our result is applicable to general two-dimensional Weyl semimetals.
description: 8 pages, 5 figures
The nature of Merovingian hegemony in Anglo-Saxon Kent
Creators: name: Peddar, David
Publisher: name: Macquarie University
Year: 2022
Subjects: Other education not elsewhere classified

description: This project investigates the extent and character of 'Frankish hegemony' in Anglo-Saxon Kent during the fifth, sixth and seventh centuries A.D. It explores both the literary and archaeological evidence and assesses the relationship which existed between the Merovingian Franks and Anglo-Saxon Kent. The proposed study reveals new perspectives on this relationship. These include political, social, culture and economic ties. Based on this evidence, the study also considers the way these ties have been contextualised in major works of modern scholarship, as they are linked to this hegemonic conception. This examination provides greater insight into contextualising contemporary events including the Gregorian mission and the general development of North-West Europe during this period. It considers the various implications raised by economic, cultural, diplomatic and religious exchange systems. It addresses whether this affiliation should be reconstructed as 'hegemony' in any form. It considers if the assumed Frankish or Merovingian 'hegemony' can be reconstructed and justified through other theoretical frameworks. These include approaches such as post-colonialism.
A Lieb-Thirring inequality for extended anyons
Creators: name: Girardot, Théotime
name: Rougerie, Nicolas
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mathematical Physics (math-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We derive a Pauli exclusion principle for extended fermion-based anyons of any positive radius and any non-trivial statistics parameter. That is, we consider 2D fermionic particles coupled to magnetic flux tubes of non-zero radius, and prove a Lieb-Thirring inequality for the corresponding many-body kinetic energy operator. The implied constant is independent of the radius of the flux tubes, and proportional to the statistics parameter.
Argumentation - justification, localization and propagation of admissibility
Creators: name: Hezart, Armin
Publisher: name: Macquarie University
Year: 2022
Subjects: Other education not elsewhere classified

description: Abstract argumentation frameworks are used to study various aspects of interaction between arguments. One most fundamental such interaction is that some arguments may attack some other arguments. In a sense, only those arguments finally matter that are successfully defended against the attackers. Such arguments are called admissible. This thesis incorporates three papers in this area of research, two of which are devoted to the admissibility of arguments. The first paper introduces the notion of the admissibility backing of an argument – a minimal set of admissible arguments that can successfully defend (respectively attack) a given argument against its attackers (defenders). This paper shows how admissible backings can help us localize the admissibility of an argument. It does so by separating those arguments that are relevant to the admissibility of a given argument from those that are not. Independent corroboration for this approach is provided by showing how major results in Dung’s approach to argumentation can be obtained using admissibility backings. The second paper explores the propagation of admissibility backings in the following sense: under what condition, and in what way, an admissibility backing of a given argument will contribute to the backing of a different argument? It is shown that under certain conditions, the propagation is transitive. It is further shown how the propagation of admissibility backings can be used to partition an argumentation framework to independent sub-frameworks. This is indicative of an interesting approach to the splitting and merging of different argumentation frameworks, a theoretical investigation of which is left for future research. The last paper explores a novel approach to marrying the argumentation frameworks to defeasible reasoning. The desired goal behind this approach is that an argument that is deemed justied in an argumentation framework should indeed satisfy our expectations as per defeasible reasoning. The efficacy of this approach is shown by providing a mapping from it to Dung’s argumentation framework.
Network model for periodically strained graphene
Creators: name: De Beule, Christophe
name: Phong, Vo Tien
name: Mele, E. J.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The long-wavelength physics of monolayer graphene in the presence of periodic strain fields has a natural chiral scattering network description. When the strain field varies slowly compared to the graphene lattice and the effective magnetic length of the induced valley pseudomagnetic field, the low-energy physics can be understood in terms of valley-polarized percolating domain-wall modes. Inspired by a recent experiment, we consider a strain field with threefold rotation and mirror symmetries but without twofold rotation symmetry, resulting in a system with the connectivity of the oriented kagome network. Scattering processes in this network are captured by a symmetry-constrained phenomenological $S$ matrix. We analyze the phase diagram of the kagome network, and show that the bulk physics of the strained graphene can be qualitatively captured by the network when we account for a percolation transition at charge neutrality. We also discuss the limitations of this approach to properly account for boundary physics.
description: 13 pages; 11 figures
Dark Matter Trapping by Stellar Bars: The Shadow Bar
Creators: name: Petersen, Michael S.
name: Weinberg, Martin D.
name: Katz, Neal
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We investigate the complex interactions between the stellar disc and the dark-matter halo during bar formation and evolution using N-body simulations with fine temporal resolution and optimally chosen spatial resolution. We find that the forming stellar bar traps dark matter in the vicinity of the stellar bar into bar-supporting orbits. We call this feature the shadow bar. The shadow bar modifies both the location and magnitude of the angular momentum transfer between the disc and dark matter halo and adds 10 per cent to the mass of the stellar bar over 4 Gyr. The shadow bar is potentially observable by its density and velocity signature in spheroid stars and by direct dark matter detection experiments. Numerical tests demonstrate that the shadow bar can diminish the rate of angular momentum transport from the bar to the dark matter halo by more than a factor of three over the rate predicted by dynamical friction with an untrapped dark halo, and thus provides a possible physical explanation for the observed prevalence of fast bars in nature.
description: 16 pages, 12 figures. MNRAS accepted
Semiclassical spin transport in LaO/STO system in the presence of multiple Rashba spin orbit couplings
Creators: name: Kundu, Anirban
name: Siu, Zhuo Bin
name: A, Jalil Mansoor B.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The interaction between the linear and cubic spin-orbit coupling with magnetic moments and mobile spin-polarized carriers in the LaO/STO system provides new avenues for spin transport applications. We study the interplay between linear and cubic Rashba spin orbit coupling (RSOC) on in-plane magnetic moments in the LaO/STO system using the Boltzmann transport theory based on the relaxation time approximation (RTA) and the more refined Schliemann-Loss (SL) delta-potential scattering model. In general, both methods yield a linear (quadratic) relationship between the spin accumulation (spin current) when one of the three RSOC strengths is varied and the other two fixed. The simultaneous presence of multiple types of RSOC with distinct angular dependences is a key ingredient in breaking the k-space symmetry of the Fermi surface, thus ensuring a finite spin accumulation upon integration over the entire Fermi surface. While the oft-used RTA method is sufficiently accurate for spin accumulation calculations, the more refined SL model is required for spin current calculations because the RTA method neglects the anisotropy of the Fermi contour arising from the cubic RSOC terms. Based on the refined SL model and under optimal tuning of the RSOC parameters, the spin charge conversion values in LaO/STO is predicted to reach a remarkable efficiency of 30.
Make a common cause: negotiation and the failure to compromise in the Haitian Revolution, 1791
Creators: name: Mobley, Christina Frances
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2010

description: This work investigates the demands made in negotiations between white colonists, gens de couleurs, and insurgents in the opening months of the Haitian Revolution. It argues that, at least initially, demands for general emancipation were not made, but instead that insurgents sought the amelioration of working conditions on plantations and gens de couleur asked for political rights. It explores the role of on the ground interlocutors in order to explore the aims and motivations of each group, and finds that military leaders of each group were willing to make important compromises. By looking at the pragmatism, contingency, and compromise of these early negotiations, the paper seeks to complicate the trajectory toward emancipation and republicanism emphasized in the historiography. These early negotiations allow for a deeper exploration of the goals of the parties involved, one that emphasizes contingency and transformation.
Trust & Cooperation
Creators: name: Aycinena, Diego
name: Kujal, Praveen
name: Camera, Gabriele
Publisher: name: Open Science Framework
Year: 2022
Subjects: subject: Economics
subject: Social and Behavioral Sciences
subject: trust game; cooperation; prisoner's dilemma; experiment

description: In this project, we examine the role of trust in cooperation in social dilemmas using online experiments.
Acoustic attenuation in magnetic insulator films: effects of magnon polaron formation
Creators: name: Zhuang, Shihao
name: Hu, Jia-Mian
Publisher: name: arXiv
Year: 2022
Subjects: subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: A magnon and a phonon are the quanta of spin wave and lattice wave, respectively, and they can hybridize into a magnon polaron when their frequencies and wavenumbers match close enough the values at the exceptional point. Guided by an analytically calculated magnon polaron dispersion, dynamical phase-field simulations are performed to investigate the effects of magnon polaron formation on the attenuation of a bulk acoustic wave in a magnetic insulator film. It is shown that a stronger magnon-phonon coupling leads to a larger attenuation. The simulations also demonstrate the existence of a minimum magnon-phonon interaction time required for the magnon polaron formation, which is found to decrease with the magnetoelastic coupling coefficient but increase with the magnetic damping coefficient. These results deepen the understanding of the mechanisms of acoustic attenuation in magnetic crystals and provide insights into the design of new-concept spin interconnects that operate based on acoustically driven magnon propagation.
description: 5 figures
Entanglement detection via some classes of measurements
Creators: name: Shen, Shu-Qian
name: Li, Ming
name: Duan, Xue-Feng
Publisher: name: arXiv
Year: 2015
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Based on the mutually unbiased bases, the mutually unbiased measurements and the general symmetric informationally complete positive-operator-valued measures, we propose three separability criteria for $d$-dimensional bipartite quantum systems, which are more powerful than the corresponding ones introduced in [C. Spengler, M. Huber, S. Brierley, T. Adaktylos, and B.C. Hiesmayr, Phys. Rev. A \textbf{86}, 022311 (2012); B. Chen, T. Ma, and S.M. Fei, Phys. Rev. A \textbf{89}, 064302 (2014); B. Chen, T. Li, and S.M. Fei, arXiv:1406.7820v1 [quant-ph] (2014)]. Some states such as Werner states and Bell-diagonal states are used to further illustrate the efficiency of the presented criteria.
Extension of Chebfun to periodic functions
Creators: name: Wright, Grady B.
name: Javed, Mohsin
name: Montanelli, Hadrien
name: Trefethen, Lloyd N.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 42A10, 42A15, 65T40

description: Algorithms and underlying mathematics are presented for numerical computation with periodic functions via approximations to machine precision by trigonometric polynomials, including the solution of linear and nonlinear periodic ordinary differential equations. Differences from the nonperiodic Chebyshev case are highlighted.
description: 20 pages
't Hooft anomalies for staggered fermions
Creators: name: Catterall, Simon
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We show that the phase structure of certain staggered fermion theories can be understood on the basis of exact anomalies. These anomalies arise when staggered fermions are coupled to gravity which can be accomplished by replacing them by discrete Kähler-Dirac fermions. We first show the existence of a perturbative anomaly in even dimensions which breaks an exact $U(1)$ symmetry of the massless theory down to $Z_4$. If we attempt to gauge this $Z_4$ symmetry we find a 't Hooft anomaly which can only be cancelled for multiples of two Kähler-Dirac fields. This result is consistent with the cancellation of a further mixed non-perturbative 't Hooft anomaly between the global $Z_4$ and a reflection symmetry. In four dimensional flat space, theories of two staggered fields yield eight Dirac or sixteen Majorana fermions in the continuum limit and this critical number of fermions agrees with results in condensed matter theory literature on the fermion content required to gap boundary fermions in $4+1$ dimensional topological superconductors. It is also consistent with constraints stemming from the cancellation of spin-$Z_4$ anomalies of Weyl fermions. Indeed, cancellation of 't Hooft anomalies is a necessary requirement for symmetric mass generation and this result gives a theoretical explanation of recent numerical work on the phase diagram of interacting staggered fermions. As an application of these ideas we construct a lattice model whose low energy continuum limit is conjectured to yield the Pati-Salam GUT theory.
description: 8 pages. Minor edits. Version published in PRD
Spin parity effects in monoaxial chiral ferromagnetic chain
Creators: name: Kodama, Sohei
name: Tanaka, Akihiro
name: Kato, Yusuke
Publisher: name: arXiv
Year: 2022
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We present a fully quantum mechanical account of a novel {\it spin parity effect} -- physics which depend sharply on whether the spin quantum number $S$ is half-odd integral or integral, which we find to be present in models of monoaxial chiral ferromagnetic spin chains.
description: 22 pages, 17 figures
Making historian count. A catalogue of teaching and learning activities that introduce Quantitative skills for historians within regular History Courses
Creators: name: Revuelta-Eugercios
Publisher: name: Zenodo
Year: 2015
Subjects: quantiative historical methods

description: Final project for The Teaching and Learning in Higher Education Programme 2014/2015. This catalogue discusses why it is difficult to teach qualitative skills to historians and proposes a series of activities that historians can implement within regular history courses where the methods are relevant to the research question
Nucleonic metamodelling in light of multimessenger, PREX-II and CREX data
Creators: name: Mondal, Chiranjib
name: Gulminelli, Francesca
Publisher: name: arXiv
Year: 2022
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The need of reconciling our understanding of the behavior of hadronic matter across a wide range of densities, especially at the time when data from multimessenger observations and novel experimental facilities are flooding in, has provided new challenges to the nuclear models. Particularly, the density dependence of the isovector channel of the nuclear energy functionals seems hard to pin down if experiments like PREX-II (or PREX) and CREX are required to be taken on the same footing. We put to test this anomaly in a semi-agnostic modelling technique, by performing a full Bayesian analysis of static properties of neutron stars, together with global properties of nuclei as binding energy, charge radii and neutron skin calculated at the semi-classical level. Our results show that the interplay between bulk and surface properties, and the importance of high order empirical parameters that effectively decouple the subsaturation and the supersaturation density regime, might partially explain the tension between the different measurements and observations. If the surface behaviors, however, are decoupled from the bulk properties, we found a rather harmonious situation among experimental and observational data.
description: 13 pages, 12 figures
Self-organization phenomena in cold atmospheric pressure plasma slit jet
Creators: name: Polášková, Kateřina
name: Nečas, David
name: Dostál, Lukáš
name: Klíma, Miloš
name: Fiala, Pavel
name: Zajíčková, Lenka
Publisher: name: arXiv
Year: 2022
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The RF plasma slit jet, which produces 150 mm wide streaming plasma outside the jet body, exhibits exciting self-organization phenomena that resemble the self-organized patterns of dielectric barrier discharge (DBD) filaments. Similarly, as in DBD, the filaments are surrounded by an inhibition zone that does not allow two filaments to come closer to each other. With fast camera imaging, we observed the filamentary character of the discharge in all the studied gas feeds (Ar, Ar/N$_2$, and Ar/O$_2$). Still, the visual appearance of the filaments in the plasma and their interaction with a dielectric surface depended significantly on the gas feed. As the breakdown voltage in pure Ar is relatively low compared to the applied one, new filaments form frequently. Such newly created filaments disrupted the characteristic inter-filament distance, forcing the system to rearrange. The frequent ignition and decay processes in Ar led to short filament lifetimes (0.020-0.035 s) and their high jitter speed (0.9-1.7 m/s), as determined with an image processing custom code based on Gwyddion libraries. The number of filaments was lower in the Ar/O$_2$ and Ar/N$_2$ mixtures. It was attributed to a loss of energy in the excitation of rotational and vibrational levels and oxygen electronegativity. Since the probability of low-current side discharges transitioning into the full plasma filaments was limited in the gas mixtures, the self-organized pattern was seldom disrupted, leading to lesser movement and longer lifetimes. Unlike in Ar or Ar/O$_2$, the constricted filaments in Ar/N$_2$ were surrounded by diffuse plasma plumes, likely connected to the presence of long-lived nitrogen species. We demonstrated in the polypropylene treatment that the self-organization phenomena affected the treatment uniformity.
description: 19 pages, 11 figures, submitted to Plasma Sources Science and Technology
Geometry of Moduli Stacks of $(k,l)$-stable vector bundles over an algebraic curve
Creators: name: Mata-Gutiérrez, O.
name: Neumann, Frank
Publisher: name: arXiv
Year: 2016
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: Primary 14H60, 14D23, Secondary 14D20

description: We study the geometry of the moduli stack of vector bundles of fixed rank and degree over an algebraic curve by introducing a filtration made of open substacks build from $(k, l)$-stable vector bundles. $(k, l)$-stability was introduced by Narasimhan and Ramanan to study the geometry of the coarse moduli space of stable bundles. We will exhibit the stacky picture and analyse the geometric and cohomological properties of the moduli stacks of $(k, l)$-stable vector bundles. For particular pairs $(k, l) $ of integers we also show that these moduli stacks admit coarse moduli spaces and we discuss their interplay.
description: Some typos corrected and minor clarifications. To appear: Journal of Geometry and Physics
Tachyon-dependent Chern-Simons terms and the V-QCD Baryon
Creators: name: Järvinen, M.
name: Kiritsis, E.
name: Nitti, F.
name: Préau, E.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The structure of the five-dimensional Tachyon-Chern-Simons action and its relevance to single-baryon states in the context of the V-QCD models for holographic QCD with backreacting flavor are analyzed. The most general form of the Tachyon-Chern-Simons 5-form, compatible with symmetries and flavor anomalies is determined. It is the sum of a non-trivial gauge-invariant 5-dimensional form and a non-invariant closed 5-form that reproduces the flavor anomalies. Single-baryon solutions of the gravity theory, arising from the DBI plus Tachyon-Chern-Simons actions are considered. The baryon is realised as a bulk axial instanton. The baryon ansatz and the field equations are derived and the boundary conditions are determined, which ensure that the solution has finite boundary energy and unit baryon charge. The boundary baryon number, which is computed from the universal (closed) part of the Tachyon-Chern-Simons action, is shown to coincide with the bulk axial instanton number.
description: 42 pages + Appendix, 2 figures, Accepted for publication in JHEP
The institutionalization of sustainability at universities: effects on student collective action
Creators: name: Nichols, Mark Russell
Publisher: name: University of North Carolina at Chapel Hill
Year: 2011

description: This thesis addresses the questions of how the efforts of field-framing institutional actors affect the adoption of new discourses by environmental organizations and how the application of various cultural framing processes separately affect degree of adoption. In-depth interviews with student environmental organization leaders and university sustainability staff members are used to determine relative strengths of the forces at work during various stages of the institutionalization of sustainability within universities. The analysis highlights the contested nature of field framing, and shows how the initial level of framing by student environmental organizations plays a large role in their ultimate station in institutionalized university sustainability. This thesis concludes with an effort to illustrate the nested nature of framing within institutionalization, as multidirectional framing is used to create the institutions that then constrain the original framers.
The O- and B-Type Stellar Population in W3: Beyond the High-Density Layer
Creators: name: Kiminki, Megan M.
name: Kim, Jinyoung Serena
name: Bagley, Micaela B.
name: Sherry, William H.
name: Rieke, George H.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present the first results from our survey of the star-forming complex W3, combining VRI photometry with multiobject spectroscopy to identify and characterize the high-mass stellar population across the region. With 79 new spectral classifications, we bring the total number of spectroscopically-confirmed O- and B-type stars in W3 to 105. We find that the high-mass slope of the mass function in W3 is consistent with a Salpeter IMF, and that the extinction toward the region is best characterized by an Rv of approximately 3.6. B-type stars are found to be more widely dispersed across the W3 giant molecular cloud (GMC) than previously realized: they are not confined to the high-density layer (HDL) created by the expansion of the neighboring W4 HII region into the GMC. This broader B-type population suggests that star formation in W3 began spontaneously up to 8--10 Myr ago, although at a lower level than the more recent star formation episodes in the HDL. In addition, we describe a method of optimizing sky subtraction for fiber spectra in regions of strong and spatially-variable nebular emission.
description: 16 pages, 12 figures, accepted for publication in ApJ
Die Bildung nichtoxidischer Sauerstoffphasen an Ru(0001)
Creators: name: Blume, Raoul
Publisher: name: Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I
Year: 2005
Subjects: subject: Ruthenium
subject: Sauerstoff
subject: Subsurface
subject: Oxid
subject: ruthenium
subject: oxygen
subject: subsurface
subject: oxide
subject: 530 Physik
subject: 29 Physik, Astronomie

description: In dieser Arbeit wurde die Bildung nichtoxidischer Sauerstoffphasen an der Ru(0001)-Oberfläche untersucht. Glatte und defektreiche Oberflächen wurden einem hohen Sauerstoffdruck (bis 1bar) bei moderaten Temperaturen (
description: The aim of the thesis presented here was the investigation of the formation of non oxidic oxygen phases on the Ru(0001) surface. Smooth and defect rich surfaces were exposed to high oxygen pressures (up to 1bar) at moderate temperatures (
Quantum information as a non-Kolmogorovian generalization of Shannon's theory
Creators: name: Holik, F.
name: Bosyk, G. M.
name: Bellomo, G.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this article we discuss the formal structure of a generalized information theory based on the extension of the probability calculus of Kolmogorov to a (possibly) non-commutative setting. By studying this framework, we argue that quantum information can be considered as a particular case of a huge family of non-commutative extensions of its classical counterpart. In any conceivable information theory, the possibility of dealing with different kinds of information measures plays a key role. Here, we generalize a notion of state spectrum, allowing us to introduce a majorization relation and a new family of generalized entropic measures.
Anomaly Detection under Coordinate Transformations
Creators: name: Kasieczka, Gregor
name: Mastandrea, Radha
name: Mikuni, Vinicius
name: Nachman, Benjamin
name: Pettee, Mariel
name: Shih, David
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: There is a growing need for machine learning-based anomaly detection strategies to broaden the search for Beyond-the-Standard-Model (BSM) physics at the Large Hadron Collider (LHC) and elsewhere. The first step of any anomaly detection approach is to specify observables and then use them to decide on a set of anomalous events. One common choice is to select events that have low probability density. It is a well-known fact that probability densities are not invariant under coordinate transformations, so the sensitivity can depend on the initial choice of coordinates. The broader machine learning community has recently connected coordinate sensitivity with anomaly detection and our goal is to bring awareness of this issue to the growing high energy physics literature on anomaly detection. In addition to analytical explanations, we provide numerical examples from simple random variables and from the LHC Olympics Dataset that show how using probability density as an anomaly score can lead to events being classified as anomalous or not depending on the coordinate frame.
description: 10 pages, 6 figures
Modular graph forms from equivariant iterated Eisenstein integrals
Creators: name: Dorigoni, Daniele
name: Doroudiani, Mehregan
name: Drewitt, Joshua
name: Hidding, Martijn
name: Kleinschmidt, Axel
name: Matthes, Nils
name: Schlotterer, Oliver
name: Verbeek, Bram
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Number Theory (math.NT)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: The low-energy expansion of closed-string scattering amplitudes at genus one introduces infinite families of non-holomorphic modular forms called modular graph forms. Their differential and number-theoretic properties motivated Brown's alternative construction of non-holomorphic modular forms in the recent mathematics literature from so-called equivariant iterated Eisenstein integrals. In this work, we provide the first validations beyond depth one of Brown's conjecture that equivariant iterated Eisenstein integrals contain modular graph forms. Apart from a variety of examples at depth two and three, we spell out the systematics of the dictionary and make certain elements of Brown's construction fully explicit to all orders.
description: 45 pages; submission includes ancillary data files; v2: typos corrected / minor improvements, matches published version
Quantum manifestation of the classical bifurcation in the driven dissipative Bose-Hubbard dimer
Creators: name: Muraev, P. S.
name: Maksimov, D. N.
name: Kolovsky, A. R.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We analyze the classical and quantum dynamics of the driven dissipative Bose-Hubbard dimer. Under variation of the driving frequency, the classical system is shown to exhibit a bifurcation to the limit cycle, where its steady-state solution corresponds to periodic oscillation with the frequency unrelated to the driving frequency. This bifurcation is shown to lead to a peculiarity in the stationary single-particle density matrix of the quantum system. The case of the Bose-Hubbard trimer, where the discussed limit cycle bifurcates into a chaotic attractor, is briefly discussed.
description: 4 pages, 4 figures
Trivial and inverted Dirac bands, and emergence of quantum spin Hall states in graphene on transition-metal dichalcogenides
Creators: name: Gmitra, Martin
name: Kochan, Denis
name: Högl, Petra
name: Fabian, Jaroslav
Publisher: name: arXiv
Year: 2015
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Proximity orbital and spin-orbital effects of graphene on monolayer transition-metal dichalcogenides (TMDCs) are investigated from first-principles. The Dirac band structure of graphene is found to lie within the semiconducting gap of TMDCs for sulfides and selenides, while it merges with the valence band for tellurides. In the former case the proximity-induced staggered potential gaps and spin-orbit couplings (all on the meV scale) of the Dirac electrons are established by fitting to a phenomenological effective Hamiltonian. While graphene on MoS$_2$, MoSe$_2$, and WS$_2$ has a topologically trivial band structure, graphene on WSe$_2$ exhibits inverted bands. Using a realistic tight-binding model we find topologically protected helical edge states for graphene zigzag nanoribbons on WSe$_2$, demonstrating the quantum spin Hall effect. This model also features "half-topological states", which are protected against time-reversal disorder on one edge only.
description: 10 pages, 11 figures
Beyond Economic Impact: The Psychic Income Received by the Chapel Hill Community from Carolina Athletics
Creators: name: Zagorin, Lea
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2017

description: Social and emotional benefits have often been cited as reasons for a community to invest in a college athletics program, despite there being little data to support or refute these assumptions. Athletics administrators often cite these social and emotional benefits (in addition to economic impact) as key justifications of public subsidy of collegiate athletics. In light of today's rapid commercialization of college athletics and heavy media scrutiny, an intense pressure on student-athletes and coaches to win and skyrocketing coaching salaries, it is important to gather data on the social, emotional and psychological impacts (psychic income) of collegiate athletics on the community that supports it. The purpose of this study is to measure the psychic income residents of Chapel Hill, North Carolina receive from the university athletics department. Psychic income is the emotional and psychological benefit that residents perceive they receive from a local sports team or event, even though they may not physically attend sports events, and are not involved in organizing them. A modified scale of the Kim and Walker (2012) psychic income survey was used to evaluate psychic income received by Chapel Hill residents. Results demonstrated Chapel Hill residents receive an overall positive psychic income from Carolina athletics. This study fills an important gap in the literature relative to the measurement of non-economic benefits intercollegiate athletics can provide a college community. Results also provide helpful insight to athletics administrators about the perceptions community members hold of their athletic department.
Live to die another day: the rebrightening of AT2018fyk as a repeating partial tidal disruption event
Creators: name: Wevers, T.
name: Coughlin, E. R.
name: Pasham, D. R.
name: Guolo, M.
name: Sun, Y.
name: Wen, S.
name: Jonker, P. G.
name: Zabludoff, A.
name: Malyali, A.
name: Arcodia, R.
name: Liu, Z.
name: Merloni, A.
name: Rau, A.
name: Grotova, I.
name: Short, P.
name: Cao, Z.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Stars that interact with supermassive black holes (SMBHs) can either be completely or partially destroyed by tides. In a partial tidal disruption event (TDE) the high-density core of the star remains intact, and the low-density, outer envelope of the star is stripped and feeds a luminous accretion episode. The TDE AT2018fyk, with an inferred black hole mass of $10^{7.7\pm0.4}$ M$_{\odot}$, experienced an extreme dimming event at X-ray (factor of $>$6000) and UV (factor $\sim$15) wavelengths $\sim$500--600 days after discovery. Here we report on the re-emergence of these emission components roughly 1200 days after discovery. We find that the source properties are similar to those of the pre-dimming accretion state, suggesting that the accretion flow was rejuvenated to a similar state. We propose that a repeating partial TDE, where the partially disrupted star is on a $\sim 1200$ day orbit about the SMBH and is periodically stripped of mass during each pericenter passage, powers its unique lightcurve. This scenario provides a plausible explanation for AT2018fyk's overall properties, including the rapid dimming event and the rebrightening at late times. We also provide testable predictions for the behavior of the accretion flow in the future: if the second encounter was also a partial disruption then we predict another strong dimming event around day 1800 (August 2023), and a subsequent rebrightening around day 2400 (March 2025). This source provides strong evidence of the partial disruption of a star by a SMBH.
description: ApJ Letters, accepted for publication
Aspects of Isotropy in Small Categories
Creators: name: Khan, Sakif
Publisher: name: Université d'Ottawa / University of Ottawa
Year: 2017
Subjects: category theory
topos theory
algebraic topology

description: In the paper \cite{FHS12}, the authors announce the discovery of an invariant for Grothendieck toposes which they call the isotropy group of a topos. Roughly speaking, the isotropy group of a topos carries algebraic data in a way reminiscent of how the subobject classifier carries spatial data. Much as we like to compute invariants of spaces in algebraic topology, we would like to have tools to calculate invariants of toposes in category theory. More precisely, we wish to be in possession of theorems which tell us how to go about computing (higher) isotropy groups of various toposes. As it turns out, computation of isotropy groups in toposes can often be reduced to questions at the level of small categories and it is therefore interesting to try and see how isotropy behaves with respect to standard constructions on categories. We aim to provide a summary of progress made towards this goal, including results on various commutation properties of higher isotropy quotients with colimits and the way isotropy quotients interact with categories collaged together via certain nice kinds of profunctors. The latter should be thought of as an analogy for the Seifert-van Kampen theorem, which allows computation of fundamental groups of spaces in terms of fundamental groups of smaller subspaces.
Planner as educator: A vision of a new practitioner
Creators: name: Alexander, Don
name: Calliou, Sharilyn
Publisher: name: Vancouver Island University - Royal Roads University
Year: 1991
Subjects: subject: Communication in regional planning
subject: Land use--Planning--Citizen participation
subject: Regional planning--Citizen participation
subject: Planning--Technique
subject: Social learning

description: This paper examines and compares the visionary tradition in planning and community education for their possible relevance to "emerging futures" for planners. It suggests the need for a new practitioner who will combine the holism of visionary planning with the empowerment strategies of community education, and contrasts this with the traditional model of the "expert" planner. The authors describe characteristics of the new practitioner, as drawn from the two traditions, and relate them to the challenges of the coming decade.
description: The following article originally appeared as: Alexander, D. & Calliou, S. (1991). Planner as educator: A vision of a new practitioner. Plan Canada, 31(6), 38-45. Plan Canada is published by the Canadian Institute of Planners. The CIP website can be found at: http://www.cip-icu.ca.
description: https://viuspace.viu.ca/bitstream/handle/10613/5030/Alexander.PC.31.6.pdf?sequence=4
Interferometer Response to Geontropic Fluctuations
Creators: name: Li, Dongjun
name: Lee, Vincent S. H.
name: Chen, Yanbei
name: Zurek, Kathryn M.
Publisher: name: arXiv
Year: 2022
Subjects: 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 model vacuum fluctuations in quantum gravity with a scalar field, characterized by a high occupation number, coupled to the metric. The occupation number of the scalar is given by a thermal density matrix, whose form is motivated by fluctuations in the vacuum energy, which have been shown to be conformal near a light-sheet horizon. For the experimental measurement of interest in an interferometer, the size of the energy fluctuations is fixed by the area of a surface bounding the volume of spacetime being interrogated by an interferometer. We compute the interferometer response to these "geontropic" scalar-metric fluctuations, and apply our results to current and future interferometer measurements, such as LIGO and the proposed GQuEST experiment.
description: 17 pages, 6 figures
Analyzing Variation in Fan Identification Development and the Effects on Intercollegiate Athletic Fundraising
Creators: name: Barrett, Andrew
Publisher: name: University of North Carolina at Chapel Hill Graduate School
Year: 2015
Subjects: Sports administration

description: More money is currently being invested in intercollegiate sports than ever and it has led to an "arms race" including spending hundreds of millions of dollars on athletic facilities, enhancing student-athlete welfare, and multi-million dollar contracts for coaches. The onus has been placed on athletic development organizations to increase fundraising efforts to meet the needs of expanding budgets. The purpose of this study is to analyze how highly identified fans are with an institution at different ages and examine the relationship between when a person develops an identification and their donor behavior. The highest rated motivating factors were analyzed for the population as a whole and in demographic sub-categories. There were no statistically significant differences between high and low identification scores and different donor groups (annual gift and total lifetime giving). Additionally, no statistically significant differences were found on fan identification scores based on annual giving levels at different age categories.