cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
ESTUDO SOBRE FINANÇAS PESSOAIS COM DISCENTES DE UMA INSTITUIÇÃO DE ENSINO SUPERIOR PÚBLICA
Creators: name: Santos, Marcos Igor Da Costa
name: De Amorim Pereira Moreira, Josicleide
Publisher: name: Revista de Informação Contábil
Year: 2023
Subjects: Educação financeira, Planejamento financeiro, Finanças pessoais.

description: O presente estudo teve o objetivo de identificar como os discentes dos cursos de Ciências Contábeis e Ciências Econômicas de uma Instituição de Ensino Superior (IES) pública lidam com suas finanças pessoais. Esta pesquisa, de natureza descritiva e quantitativa, conteve uma amostra de 79 discentes e, para o alcance do objetivo, utilizou-se de um questionário, adaptado do modelo de Medeiros & Lopes (2014), estruturado em seis partes e contendo 22 questões fechadas. Os resultados obtidos apontaram que os discentes se consideram responsáveis para lidar com o dinheiro e que os costumes familiares influenciam em suas decisões de consumo. Além disso, pagam suas compras habitualmente à vista e fazem uso do cartão de crédito como principal forma de pagamento. Percebeu-se ainda que a maioria deles não possui dívidas e os que possuem, decorrem principalmente de compras no cartão de crédito. Por fim, constatou-se que os discentes gastam menos do que ganham, têm o costume de frequentemente planejar os seus gastos pessoais e possuem o hábito de regularmente economizar.
description: Revista de Informação Contábil, v. 16 (2022): PDW – Paper Development Workshop" - RIC-IJAR
Properties of discrete breathers in graphane from ab initio simulations
Creators: name: Chechin, G. M.
name: Dmitriev, S. V.
name: Lobzenko, I. P.
name: Ryabov, D. S.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: A density functional theory (DFT) study of the discrete breathers (DBs) in graphane (fully hydrogenated graphene) was performed. To the best of our knowledge, this is the first demonstration of the existence of DBs in a crystalline body from the first-principle simulations. It is found that the DB is a robust, highly localized vibrational mode with one hydrogen atom oscillating with a large amplitude along the direction normal to the graphane plane with all neighboring atoms having much smaller vibration amplitudes. DB frequency decreases with increase in its amplitude, and it can take any value within the phonon gap and can even enter the low-frequency phonon band. The concept of DB is then used to propose an explanation to the recent experimental results on the nontrivial kinetics of graphane dehydrogenation at elevated temperatures.
description: 20.07.14 Submitted to PhysRevB
TECNE: Knowledge based text classification using network embeddings
Creators: name: Türker, Rima,
name: Koutraki, Maria,
name: Zhang, Lei,
name: Sack, Harald
Publisher: name: Karlsruhe
Year: 2018

description: Text classification is an important and challenging task due to its application in various domains such as document organization and news filtering. Several supervised learning approaches have been proposed for text classification. However, most of them require a significant amount of training data. Manually labeling such data can be very time-consuming and costly. To overcome the problem of labeled data, we demonstrate TECNE, a knowledge-based text classification method using network embeddings. The proposed system does not require any labeled training data to classify an arbitrary text. Instead, it relies on the semantic similarity between entities appearing in a given text and a set of predefined categories to determine a category which the given document belongs to.
Quantum mechanics of null polygonal Wilson loops
Creators: name: Belitsky, A. V.
name: Derkachov, S. E.
name: Manashov, Alexander
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: 530 Physik

description: Scattering amplitudes in maximally supersymmetric gauge theory are dual to super-Wilson loops on null polygonal contours. The operator product expansion for the latter revealed that their dynamics is governed by the evolution of multiparticle GKP excitations. They were shown to emerge from the spectral problem of an underlying open spin chain. In this work we solve this model with the help of the Baxter Q-operator and Sklyanin's Separation of Variables methods. We provide an explicit construction for eigenfunctions and eigenvalues of GKP excitations. We demonstrate how the former define the so-called multiparticle hexagon transitions in super-Wison loops and prove their factorized form suggested earlier.
Effect of gallium doping on structural and transport properties of the topological insulator Bi2Se3 grown by molecular beam epitaxy
Creators: name: Brito, Daniel
name: Pérez-Rodriguez, Ana
name: Khatri, Ishwor
name: Tavares, Carlos José
name: Amado, Mario
name: Castro, Eduardo
name: Diez, Enrique
name: Sadewasser, Sascha
name: Claro, Marcel S
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Topological insulators possess a non-conductive bulk and present surface states, henceforth, they are electrically conductive along their boundaries. Bismuth selenide ($Bi_2Se_3$) is one of the most promising topological insulators. However, a major drawback is its n-type nature arising from its natural doping, which makes the transport in the bulk dominant. This effect can be overcome by shifting the chemical potential into the bandgap, turning the transport of the surface states to be more pronounced than the bulk counterpart. In this work, $Bi_2Se_3$ was grown by molecular beam epitaxy and doped with 0.8, 2, 7, and 14 at. % of Ga, with the aim of shifting the chemical potential into the bandgap. The structural, morphological, and electronic properties of the Ga doped $Bi_2Se_3$ are studied. Raman and X-ray diffraction measurements confirmed the incorporation of the dopants into the crystal structure. Transport and magnetoresistance measurements in the temperature range of 1.5 to 300 K show that Ga-doped $Bi_2Se_3$ is n-type with a bulk charge carrier concentration of $10^{19} cm^{-3}$. Remarkably, magnetotransport of the weak antilocalization effect (WAL) measurements confirm the existence of surface states up to a doping percentage of 2 at. % of Ga and coherence length values between 50-800 nm, which envisages the possibility of topological superconductivity in this material.
description: 17 pages, 8 figures, Supplementary Information included
Towards a fitting procedure to deeply virtual meson production - the next-to-leading order case
Creators: name: Müller, D.
name: Lautenschlager, Tobias
name: Passek-Kumerički, K.
name: Schäfer, Andreas
Publisher: name: Universität Regensburg
Year: 2013
Subjects: subject: 530 Physik

description: Based on the collinear factorization approach, we present a comprehensive perturbative next-to-leading (NLO) analysis of deeply virtual meson production (DVMP). Our representation in conformal Mellin space can serve as basis for a global fitting procedure to access generalized parton distributions from experimental measurements of DVMP and deeply virtual Compton scattering (DVCS). We introduce a rather general formalism for the evaluation of conformal moments that can be developed further beyond the considered order. We also confirm previous diagrammatical findings in the pure singlet quark channel. Finally, we use the analytic properties of the hard scattering amplitudes to estimate qualitatively the size of radiative corrections and illustrate these considerations with some numerical examples. The results suggest that global NLO GPD fits, including both DVMP and DVCS data, could be more stable than often feared.
Nonperturbative Quantum Physics from Low-Order Perturbation Theory
Creators: name: Mera, Hector
name: Pedersen, T. G.
name: Nikolic, Branislav K.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: The Stark effect in hydrogen and the cubic anharmonic oscillator furnish examples of quantum systems where the perturbation results in a certain ionization probability by tunneling processes. Accordingly, the perturbed ground-state energy is shifted and broadened, thus acquiring an imaginary part which is considered to be a paradigm of nonperturbative behavior. Here we demonstrate how the low order coefficients of a divergent perturbation series can be used to obtain excellent approximations to both real and imaginary parts of the perturbed ground state eigenenergy. The key is to use analytic continuation functions with a built in analytic structure within the complex plane of the coupling constant, which is tailored by means of Bender-Wu dispersion relations. In the examples discussed the analytic continuation functions are Gauss hypergeometric functions, which take as input fourth order perturbation theory and return excellent approximations to the complex perturbed eigenvalue. These functions are Borel-consistent and dramatically outperform widely used Padé and Borel-Padé approaches, even for rather large values of the coupling constant.
description: 5 pages, 3 figures, PDFLaTeX
ESTRUTURA DE CAPITAL E COMPETITIVIDADE SETORIAL EM EMPRESAS LISTADAS NA B3 DURANTE A CRISE DO COVID-19
Creators: name: Costa, Gabrielly Mendes
name: Pinheiro, Juliano Lima
name: Lamounier, Wagner Moura
name: Bressan, Valéria Gama Fully
Publisher: name: Revista de Informação Contábil
Year: 2023
Subjects: Estrutura de capital; Endividamento; COVID-19; Competitividade; Setor

description: O objetivo deste trabalho é avaliar a influência da crise sanitária da COVID-19 e da competição de mercado dos diferentes setores na estrutura de capital das empresas brasileiras. Apoiado nas teorias de trade-off e pecking order, utilizou-se uma amostra de empresas brasileiras listadas na B3, referente ao 2° trimestre de 2018 ao 1° trimestre de 2022. As variáveis determinantes da estrutura de capital utilizadas foram: rentabilidade, tamanho, tangibilidade, composição dos ativos, crescimento, a proxy de competitividade, foi medida pelo índice de Herfindahl-Hirschman e a Dummy da crise COVID-19. O método empregado devido à presença de heterocedasticidade e autocorrelação, foi a regressão por Mínimos Quadrados Generalizados Factíveis. Os resultados apoiaram as dinâmicas de endividamento frente ao pecking order, onde com maiores retornos tendem a precisar menos de captação de recursos externos e ao trade-off, mostrando que a relação com maior tangibilidade e firmas maiores geralmente têm maiores facilidades em conseguir financiamentos. Sobre a crise da COVID-19, conclui-se que ela teve influência positiva analisada pelo setor de mercado. A pesquisa contribui para um melhor entendimento das estruturas de capital frente ao trade-off e pecking order e a crise sanitária da COVID-19.
description: Revista de Informação Contábil, v. 16 (2022): PDW – Paper Development Workshop" - RIC-IJAR
Theory of Knowledge for Literature Reviews: An Epistemological Model, Taxonomy and Empirical Analysis of IS Literature
Creators: name: Schryen, Guido
name: Wagner, Gerit
name: Benlian, Alexander
Publisher: name: Universität Regensburg
Year: 2015
Subjects: subject: Literature review, Research methods/methodology, Theory of knowledge
subject: 000 Allgemeines, Wissenschaft

description: Literature reviews play an important role in the development of knowledge. Yet, we observe a lack of theoretical underpinning of and epistemological insights into how literature reviews can contribute to knowledge creation and have actually contributed in the IS discipline. To address these theoretical and empirical research gaps, we suggest a novel epistemological model of literature reviews. This model allows us to align different contributions of literature reviews with their underlying knowledge conversions - thereby building a bridge between the previously largely unconnected fields of literature reviews and epistemology. We evaluate the appropriateness of the model by conducting an empirical analysis of 173 IS literature reviews which were published in 39 pertinent IS journals between 2000 and 2014. Based on this analysis, we derive an epistemological taxonomy of IS literature reviews, which complements previously suggested typologies.
A Multi-Theoretical Literature Review on Information Security Investments using the Resource-Based View and the Organizational Learning Theory
Creators: name: Weishäupl, Eva
name: Yasasin, Emrah
name: Schryen, Guido
Publisher: name: Universität Regensburg
Year: 2015
Subjects: subject: Information Security, Investment, Literature review, Resource-based View, Organi-zational Learning Theory, Multi-theoretical Perspective
subject: 000 Allgemeines, Wissenschaft

description: The protection of information technology (IT) has become and is predicted to remain a key economic challenge for organizations. While research on IT security investment is fast growing, it lacks a theoretical basis for structuring research, explaining economic-technological phenomena and guide future research. We address this shortcoming by suggesting a new theoretical model emerging from a multi-theoretical perspective adopt-ing the Resource-Based View and the Organizational Learning Theory. The joint appli-cation of these theories allows to conceptualize in one theoretical model the organiza-tional learning effects that occur when the protection of organizational resources through IT security countermeasures develops over time. We use this model of IT security invest-ments to synthesize findings of a large body of literature and to derive research gaps. We also discuss managerial implications of (closing) these gaps by providing practical ex-amples.
Quantum Tests of the Einstein Equivalence Principle with the STE-QUEST Space Mission
Creators: name: Altschul, Brett
name: Bailey, Quentin G.
name: Blanchet, Luc
name: Bongs, Kai
name: Bouyer, Philippe
name: Cacciapuoti, Luigi
name: Capozziello, Salvatore
name: Gaaloul, Naceur
name: Giulini, Domenico
name: Hartwig, Jonas
name: Iess, Luciano
name: Jetzer, Philippe
name: Landragin, Arnaud
name: Rasel, Ernst
name: Reynaud, Serge
name: Schiller, Stephan
name: Schubert, Christian
name: Sorrentino, Fiodor
name: Sterr, Uwe
name: Tasson, Jay D.
name: Tino, Guglielmo M.
name: Tuckey, Philip
name: Wolf, Peter
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present in detail the scientific objectives in fundamental physics of the Space-Time Explorer and QUantum Equivalence Space Test (STE-QUEST) space mission. STE-QUEST was pre-selected by the European Space Agency together with four other missions for the cosmic vision M3 launch opportunity planned around 2024. It carries out tests of different aspects of the Einstein Equivalence Principle using atomic clocks, matter wave interferometry and long distance time/frequency links, providing fascinating science at the interface between quantum mechanics and gravitation that cannot be achieved, at that level of precision, in ground experiments. We especially emphasize the specific strong interest of performing equivalence principle tests in the quantum regime, i.e. using quantum atomic wave interferometry. Although STE-QUEST was finally not selected in early 2014 because of budgetary and technological reasons, its science case was very highly rated. Our aim is to expose that science to a large audience in order to allow future projects and proposals to take advantage of the STE-QUEST experience.
description: 27 pages, 6 figures, to appear in Advances in Space Research
The Mutual Interaction Between Population III Stars and Self-Annihilating Dark Matter
Creators: name: Stacy, Athena
name: Pawlik, Andreas H.
name: Bromm, Volker
name: Loeb, Abraham
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We use cosmological simulations of high-redshift minihalos to investigate the effect of dark matter annihilation (DMA) on the collapse of primordial gas. We numerically investigate the evolution of the gas as it assembles in a Population III stellar disk. We find that when DMA effects are neglected, the disk undergoes multiple fragmentation events beginning at ~ 500 yr after the appearance of the first protostar. On the other hand, DMA heating and ionization of the gas speeds the initial collapse of gas to protostellar densities and also affects the stability of the developing disk against fragmentation, depending on the DM distribution. We compare the evolution when we model the DM density with an analytical DM profile which remains centrally peaked, and when we simulate the DM profile using N-body particles (the 'live' DM halo). When utilizing the analytical DM profile, DMA suppresses disk fragmentation for ~ 3500 yr after the first protostar forms, in agreement with earlier work. However, when using a 'live' DM halo, the central DM density peak is gradually flattened due to the mutual interaction between the DM and the rotating gaseous disk, reducing the effects of DMA on the gas, and enabling secondary protostars of mass ~ 1 M_sol to be formed within ~ 900 yr. These simulations demonstrate that DMA is ineffective in suppressing gas collapse and subsequent fragmentation, rendering the formation of long-lived dark stars unlikely. However, DMA effects may still be significant in the early collapse and disk formation phase of primordial gas evolution.
description: 17 pages, 11 figures, to appear in MNRAS
Effects of nomadic grazing system and indoor concentrate feeding systems on performance, behavior, blood parameters, and meat quality of finishing lambs
Creators: name: Sadrarhami, Imaneh
name: Alikhanni, Masoud
name: Ghasemi, Ebrahim
name: Mahdavi, Amir Hossein
name: Soltanizadeh, Nafiseh
name: Font-i-Furnols, Maria
name: Hosseini Ghaffari, Morteza
Publisher: name: figshare
Year: 2022
Subjects: Animal growth and development
Animal nutrition
Animal welfare
Animal management

description: All raw data from the measured parameters are available in S1 Table.The study was carried in central Iran (Isfahan province, Iran) during the grazing season lasted 90 days (February 1, 2019 to May 1, 2019) using Turki-Ghashghaei breed sheep. All methods were performed according to Iranian Council of Animal Care regulations and the study complies with ARRIVE guidelines for reporting in vivo experiments (IACUC#2019/09.2).
Unwinding Dynamics of a Helically Wrapped Polymer
Creators: name: Walter, Jean-Charles
name: Baiesi, Marco
name: Carlon, Enrico
name: Schiessel, Helmut
Publisher: name: arXiv
Year: 2014
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We study the rotational dynamics of a flexible polymer initially wrapped around a rigid rod and unwinding from it. This dynamics is of interest in several problems in biology and constitutes a fundamental instance of polymer relaxation from a state of minimal entropy. We investigate the dynamics of several quantities such as the total and local winding angles and metric quantities. The results of simulations performed in two and three dimensions, with and without self-avoidance, are explained by a theory based on scaling arguments and on a balance between frictional and entropic forces. The early stage of the dynamics is particularly rich, being characterized by three coexisting phases.
description: 9 pages, 9 figures
Prospects for Detecting Oxygen, Water, and Chlorophyll on an Exo-Earth
Creators: name: Brandt, Timothy D.
name: Spiegel, David S.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The goal of finding and characterizing nearby Earth-like planets is driving many NASA high-contrast flagship mission concepts, the latest of which is known as the Advanced Technology Large-Aperture Space Telescope (ATLAST). In this article, we calculate the optimal spectral resolution $R=λ/δλ$ and minimum signal-to-noise ratio per spectral bin (SNR), two central design requirements for a high-contrast space mission, in order to detect signatures of water, oxygen, and chlorophyll on an Earth twin. We first develop a minimally parametric model and demonstrate its ability to fit synthetic and observed Earth spectra; this allows us to measure the statistical evidence for each component's presence. We find that water is the easiest to detect, requiring a resolution $R \gtrsim 20$, while the optimal resolution for oxygen is likely to be closer to $R = 150$, somewhat higher than the canonical value in the literature. At these resolutions, detecting oxygen will require $\sim$2 times the SNR as water. Chlorophyll requires $\sim$6 times the SNR as oxygen for an Earth twin, only falling to oxygen-like levels of detectability for a low cloud cover and/or a large vegetation covering fraction. This suggests designing a mission for sensitivity to oxygen and adopting a multi-tiered observing strategy, first targeting water, then oxygen on the more favorable planets, and finally chlorophyll on only the most promising worlds.
description: PNAS published, replaced with accepted version. Conclusions mostly unchanged, 5 page supporting information added
Resume Anne Fouilloux
Creators: name: Fouilloux, Anne
Publisher: name: Zenodo
Year: 2023
Subjects: CV
resume

description: CV Anne Fouilloux linkedin.com/in/annefouilloux Summary Open Science and FAIR Software and Data Advocate. Focus on strengthening the Nordic position within climate modeling by leveraging, reinforcing and complementing ongoing national, European and world-wide initiatives. Interested in emerging technologies and passionate about bridging skills between different sets of expertise. Review and evaluate project proposals for the European Commission. Worked within academia, International organizations and small companies in Norway, United Kingdom & France. Hold a Master’s degree in Computer Science and a PhD’s degree focused on Remote Sensing and cloud modelling from the University of Clermont-Ferrand (France). 💬 Ask me about the European Open Science Cloud (EOSC), FAIR software, the Galaxy Climate Science Workbench and/or the Nordic Earth System Modelling Hub. 😄 Pronouns: She/her/hers
Model Predictive HVAC Control with Online Occupancy Model
Creators: name: Dobbs, Justin R.
name: Hencey, Brandon M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: This paper presents an occupancy-predicting control algorithm for heating, ventilation, and air conditioning (HVAC) systems in buildings. It incorporates the building's thermal properties, local weather predictions, and a self-tuning stochastic occupancy model to reduce energy consumption while maintaining occupant comfort. Contrasting with existing approaches, the occupancy model requires no manual training and adapts to changes in occupancy patterns during operation. A prediction-weighted cost function provides conditioning of thermal zones before occupancy begins and reduces system output before occupancy ends. Simulation results with real-world occupancy data demonstrate the algorithm's effectiveness.
description: Energy and Buildings preprint, submitted July 2014, 27 pages, 13 figures
Effects of nomadic grazing system and indoor concentrate feeding systems on performance, behavior, blood parameters, and meat quality of finishing lambs
Creators: name: Sadrarhami, Imaneh
name: Alikhanni, Masoud
name: Ghasemi, Ebrahim
name: Mahdavi, Amir Hossein
name: Soltanizadeh, Nafiseh
name: Font-i-Furnols, Maria
name: Hosseini Ghaffari, Morteza
Publisher: name: figshare
Year: 2022
Subjects: Animal growth and development
Animal nutrition
Animal welfare
Animal management

description: The zip file contains the raw data, supporting information and certificates. The study was carried in central Iran (Isfahan province, Iran) during the grazing season lasted 90 days (February 1, 2019 to May 1, 2019) using Turki-Ghashghaei breed sheep. All methods were performed according to Iranian Council of Animal Care regulations and the study complies with ARRIVE guidelines for reporting in vivo experiments (IACUC#2019/09.2).
Constraining the dynamical dark energy parameters: Planck-2013 vs WMAP9
Creators: name: Novosyadlyj, B.
name: Sergijenko, O.
name: Durrer, R.
name: Pelykh, V.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We determine the best-fit values and confidence limits for dynamical dark energy parameters together with other cosmological parameters on the basis of different datasets which include WMAP9 or Planck-2013 results on CMB anisotropy, BAO distance ratios from recent galaxy surveys, magnitude-redshift relations for distant SNe Ia from SNLS3 and Union2.1 samples and the HST determination of the Hubble constant. We use a Markov Chain Monte Carlo routine to map out the likelihood in the multi-dimensional parameter space. We show that the most precise determination of cosmological parameters with the narrowest confidence limits is obtained for the Planck{+}HST{+}BAO{+}SNLS3 dataset. The best-fit values and 2$σ$ confidence limits for cosmological parameters in this case are $Ω_{de}=0.718\pm0.022$, $w_0=-1.15^{+0.14}_{-0.16}$, $c_a^2=-1.15^{+0.02}_{-0.46}$, $Ω_bh^2=0.0220\pm0.0005$, $Ω_{cdm}h^2=0.121\pm0.004$, $h=0.713\pm0.027$, $n_s=0.958^{+0.014}_{-0.010}$, $A_s=(2.215^{+0.093}_{-0.101})\cdot10^{-9}$, $τ_{rei}=0.093^{+0.022}_{-0.028}$. For this dataset, the $Λ$CDM model is just outside the 2$σ$ confidence region, while for the dataset WMAP9{+}HST{+}BAO{+}SNLS3 the $Λ$CDM model is only 1$σ$ away from the best fit. The tension in the determination of some cosmological parameters on the basis of two CMB datasets WMAP9 and Planck-2013 is highlighted.
description: 16 pages, 5 figures, 2 tables; accepted for publication in JCAP
Discrete Convexity and Polynomial Solvability in Minimum 0-Extension Problems
Creators: name: Hirai, Hiroshi
Publisher: name: arXiv
Year: 2014
Subjects: subject: Metric Geometry (math.MG)
subject: FOS: Mathematics
subject: 90C27

description: For a graph G and a set V containing the vertex set of G, a 0-extension of G is a metric d on V such that d extends the shortest path metric of G and for all x in V there exists a vertex s in G with d(x, s) = 0. The minimum 0-extension problem 0-Ext[G] on G is: given a set V containing V(G) and a nonnegative cost function c defined on the set of all pairs of V, find a 0-extension d of G with \sum c(xy)d(x, y) minimum. The 0-extension problem generalizes a number of basic combinatorial optimization problems, such as minimum (s,t)-cut problem and multiway cut problem. Karzanov proved the polynomial solvability of 0-Ext[G] for a certain large class of modular graphs G, and raised the question: What are the graphs G for which 0-Ext[G] can be solved in polynomial time? He also proved that 0-Ext[G] is NP-hard if G is not modular or not orientable (in a certain sense). In this paper, we prove the converse: if G is orientable and modular, then 0-Ext[G] can be solved in polynomial time. This completes the classification of graphs G for which 0-Ext[G] is tractable. To prove our main result, we develop a theory of discrete convex functions on orientable modular graphs, analogous to discrete convex analysis by Murota, and utilize a recent result of Thapper and Zivny on valued CSP.
description: This is a revised version of preprint METR 2012-18; the extended abstract appeared in SODA'13; minor corrections (ver 2); fixing typos (ver 3); Mathematical Programming, Series A, to appear
On Self-adjoint extensions and symmetries in Quantum Mechanics
Creators: name: Ibort, Alberto
name: Lledó, Fernando
name: Pérez-Pardo, Juan Manuel
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mathematical Physics (math-ph)
subject: Functional Analysis (math.FA)
subject: Spectral Theory (math.SP)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 81Q10, 35J05, 46L60

description: Given a unitary representation of a Lie group $G$ on a Hilbert space $\mathcal{H}$, we develop the theory of $G$-invariant self-adjoint extensions of symmetric operators both using von Neumann's theorem and the theory of quadratic forms. We also analyze the relation between the reduction theory of the unitary representation and the reduction of the $G$-invariant unbounded operator. We also prove a $G$-invariant version of the representation theorem for quadratic forms. The previous results are applied to the study of $G$-invariant self-adjoint extensions of the Laplace-Beltrami operator on a smooth Riemannian manifold with boundary on which the group $G$ acts. These extensions are labeled by admissible unitaries $U$ acting on the $L^2$-space at the boundary and having spectral gap at $-1$. It is shown that if the unitary representation $V$ of the symmetry group $G$ is traceable, then the self-adjoint extension of the Laplace-Beltrami operator determined by $U$ is $G$-invariant if $U$ and $V$ commute at the boundary. Various significant examples are discussed at the end.
description: General stylistic improvements and typos corrected. References added. 27 pages, 1 figure. To appear in Annales Henri Poincar\'e
CliMA/SCAMPy Release version for He et al submission 2020
Creators: name: He, Jia
name: Cohen, Yair
name: Lopez-Gomez, Ignacio
name: Jaruga, Anna
name: Schneider, Tapio
Publisher: name: Zenodo
Year: 2020

description: This release version is implemented in the manuscript submitted to JAMES: He, J., Cohen, Y., Lopez-Gomez, I., Jaruga, A., and Schneider, T., 2020: An Improved Perturbation Pressure Closure for Eddy-Diffusivity Mass-Flux Schemes. Journal of Advances in Modeling Earth Systems, submitted.
A Statistical Analysis of SEEDS and Other High-Contrast Exoplanet Surveys: Massive Planets or Low-Mass Brown Dwarfs?
Creators: name: Brandt, Timothy D.
name: McElwain, Michael W.
name: Turner, Edwin L.
name: Mede, Kyle
name: Spiegel, David S.
name: Kuzuhara, Masayuki
name: Schlieder, Joshua E.
name: Wisniewski, John P.
name: Abe, L.
name: Biller, B.
name: Brandner, W.
name: Carson, J.
name: Currie, T.
name: Egner, S.
name: Feldt, M.
name: Golota, T.
name: Goto, M.
name: Grady, C. A.
name: Guyon, O.
name: Hashimoto, J.
name: Hayano, Y.
name: Hayashi, M.
name: Hayashi, S.
name: Henning, T.
name: Hodapp, K. W.
name: Inutsuka, S.
name: Ishii, M.
name: Iye, M.
name: Janson, M.
name: Kandori, R.
name: Knapp, G. R.
name: Kudo, T.
name: Kusakabe, N.
name: Kwon, J.
name: Matsuo, T.
name: Miyama, S.
name: Morino, J. -I.
name: Moro-Martín, A.
name: Nishimura, T.
name: Pyo, T. -S.
name: Serabyn, E.
name: Suto, H.
name: Suzuki, R.
name: Takami, M.
name: Takato, N.
name: Terada, H.
name: Thalmann, C.
name: Tomono, D.
name: Watanabe, M.
name: Yamada, T.
name: Takami, H.
name: Usuda, T.
name: Tamura, M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We conduct a statistical analysis of a combined sample of direct imaging data, totalling nearly 250 stars. The stars cover a wide range of ages and spectral types, and include five detections ($κ$ And b, two $\sim$60 M$_{\rm J}$ brown dwarf companions in the Pleiades, PZ Tel B, and CD$-$35 2722B). For some analyses we add a currently unpublished set of SEEDS observations, including the detections GJ 504b and GJ 758B. We conduct a uniform, Bayesian analysis of all stellar ages using both membership in a kinematic moving group and activity/rotation age indicators. We then present a new statistical method for computing the likelihood of a substellar distribution function. By performing most of the integrals analytically, we achieve an enormous speedup over brute-force Monte Carlo. We use this method to place upper limits on the maximum semimajor axis of the distribution function derived from radial-velocity planets, finding model-dependent values of $\sim$30--100 AU. Finally, we model the entire substellar sample, from massive brown dwarfs to a theoretically motivated cutoff at $\sim$5 M$_{\rm Jup}$, with a single power law distribution. We find that $p(M, a) \propto M^{-0.65\pm0.60} a^{-0.85\pm0.39}$ (1$σ$ errors) provides an adequate fit to our data, with 1.0--3.1\% (68\% confidence) of stars hosting 5--70 $M_{\rm Jup}$ companions between 10 and 100 AU. This suggests that many of the directly imaged exoplanets known, including most (if not all) of the low-mass companions in our sample, formed by fragmentation in a cloud or disk, and represent the low-mass tail of the brown dwarfs.
description: ApJ in press, replaced with accepted version. Methodology clarified, conclusions mostly unchanged
Hypatian Physics Lean4-Verified Framework Recursive Expansive Algebraic-Geometric Quantum Gravity, Particle Physics, and Cosmology
Creators: name: Del Bel, Julian
Publisher: name: Zenodo
Year: 2025

description: We present Hypatian Physics, a Lean4-verified framework that unifies quantum gravity, particle physics, and cosmology via a recursive algebraic-geometric formulation. Our approach formalizes fundamental structures such as recursive Jordan algebras, p-adic metric spaces, and recursive renormalization group flows. The theory yields empirically testable predictions, including gravitational wave echoes, non-zero fermion masses via Yukawa couplings, and fractal spacetime geometries consistent with cosmological observations.
description: Formal Proof of Recursive Topological Vertex, Recursive Mirror Symmetry, and Recursive Renormalization Group Flow.

The sequence C(n)λµν converges to a unique limit C(∞)λµν. The convergence of the sequence is established through the geometric decay of the recursive terms and the application of the Banach Fixed-Point.
Structural transitions of nearly second order in classical dipolar gases
Creators: name: Cartarius, Florian
name: Morigi, Giovanna
name: Minguzzi, Anna
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: Particles with repulsive power-law interactions undergo a transition from a single to a double chain (zigzag) by decreasing the confinement in the transverse direction. We theoretically characterize this transition when the particles are classical dipoles, polarized perpendicularly to the plane in which the motion occurs, and argue that this transition is of first order, even though weakly. The nature of the transition is determined by the coupling between transverse and axial modes of the chain and contrasts with the behaviour found in Coulomb systems, where the linear-zigzag transition is continuous and belongs to the universality class of the ferromagnetic transition. Our results hold for classical systems with power-law interactions $1/r^α$ when $α> 2$, and show that structural transitions in dipolar systems and Rydberg atoms can offer the testbed for simulating the critical behaviour of magnets with lattice coupling.
description: to appear in Physical Review A
Supplementary document for Investigating learning empowered hologram generation for holographic displays with ill-tuned hardware - 6251208.pdf
Creators: name: Xia, Xinxing
name: yang, furong
name: wang, weisen
name: Shui, xinghua
name: Guan, Frank
name: Zheng, Huadong
name: yingjie, yu
name: Peng, Yifan
Publisher: name: Optica Publishing Group
Year: 2023
Subjects: Uncategorized

description: Supplementary experimental results and corresponding holograms
Exotic Decays Of A Heavy Neutral Higgs Through HZ/AZ Channel
Creators: name: Coleppa, Baradhwaj
name: Kling, Felix
name: Su, Shufang
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Models of electroweak symmetry breaking with extended Higgs sectors are theoretically well motivated. In this study, we focus on the Two Higgs Doublet Model with a low energy spectrum containing scalars $H$ and a pseudoscalar $A$. We study the decays $A\rightarrow HZ$ or $H\rightarrow AZ$, which could reach sizable branching fractions in certain parameter regions. With detailed collider analysis, we obtain model independent exclusion bounds as well as discovery reach at the 14 TeV LHC for the process: $gg\rightarrow A/H\rightarrow HZ/AZ$, looking at final states bbll, ττll and ZZZ(4l2j) for l =e,μ. We further interpret these bounds in the context of the Type II Two Higgs Doublet Model, considering three different classes of processes: $A\rightarrow h^0Z$, $A\rightarrow H^0Z$, and $H^0 \rightarrow AZ$, in which $h^0$ and $H^0$ are the light and heavy CP-even Higgses respectively. For 100 fb$^{-1}$ integrated luminosity at the 14 TeV LHC, we find that for parent particle mass around 300-400 GeV, $A\rightarrow h^0Z$ has the greatest reach when $H^0$ is interpreted as the 126 GeV Higgs: most regions in the tanβ-sin(β-α) parameter space can be covered by exclusion and discovery. For 126 GeV $h^0$, only relatively small tanβ<10 (5) can be reached by exclusion (discovery). For $A\rightarrow H^0Z$, the reach is typically restricted to sin$(β-α)\sim\pm 1$ with tanβ<10 in bbll and ττll channels. The ZZZ (4l2j) channel, on the other hand, covers a wide range of 0.3
description: 32 pages, 21 figures
Hypatian Physics Lean4-Verified Framework Recursive Expansive Algebraic-Geometric Quantum Gravity, Particle Physics, and Cosmology
Creators: name: Del Bel, Julian
Publisher: name: Zenodo
Year: 2025

description: We present Hypatian Physics, a Lean4-verified framework that unifies quantum gravity, particle physics, and cosmology via a recursive algebraic-geometric formulation. Our approach formalizes fundamental structures such as recursive Jordan algebras, p-adic metric spaces, and recursive renormalization group flows. The theory yields empirically testable predictions, including gravitational wave echoes, non-zero fermion masses via Yukawa couplings, and fractal spacetime geometries consistent with cosmological observations.
Dual conformal symmetry on the light-cone
Creators: name: Derkachov, S. E.
name: Korchemsky, G. P.
name: Manashov, Alexander
Publisher: name: Universität Regensburg
Year: 2013
Subjects: subject: 530 Physik

description: We study the properties of conformal operators in the SL(2) sector of planar N=4 SYM and its supersymmetric SL(2|2) extension. The correlation functions of these operators and their form factors with respect to asymptotic on-shell states are determined in the appropriate limit by two different polynomials which can be identified as eigenstates of the dilatation operator in the coordinate and momentum representations, respectively. We argue that, in virtue of integrability of the dilatation operator, the two polynomials satisfy a duality relation -- they are proportional to each other upon an appropriate identification of momenta and coordinates. Combined with the conventional N=4 superconformal symmetry, this leads to the dual superconformal symmetry of the dilatation operator. We demonstrate that this symmetry is powerful enough to fix the eigenspectrum of the dilatation operator to the lowest order in the coupling. We use the relation between the one-loop dilatation operator and Heisenberg spin chain to show that, to lowest order in the coupling, the dual symmetry is generated by the Baxter Q-operator in the limit of large spectral parameter.
Phase Transitions on Random Lattices: How Random is Topological Disorder?
Creators: name: Barghathi, Hatem
name: Vojta, Thomas
Publisher: name: arXiv
Year: 2014
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the effects of topological (connectivity) disorder on phase transitions. We identify a broad class of random lattices whose disorder fluctuations decay much faster with increasing length scale than those of generic random systems, yielding a wandering exponent of $ω=(d-1)/(2d)$ in $d$ dimensions. %instead of the generic value $ω=1/2$. The stability of clean critical points is thus governed by the criterion $(d+1)ν> 2$ rather than the usual Harris criterion $dν>2$, making topological disorder less relevant than generic randomness. The Imry-Ma criterion is also modified, allowing first-order transitions to survive in all dimensions $d>1$. These results explain a host of puzzling violations of the original criteria for equilibrium and nonequilibrium phase transitions on random lattices. We discuss applications, and we illustrate our theory by computer simulations of random Voronoi and other lattices.
description: 4.5 pages, 4 eps figures, final version as published
Coulomb interaction effects on the Majorana states in quantum wires
Creators: name: Manolescu, Andrei
name: Marinescu, D. C.
name: Stanescu, Tudor D.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The stability of the Majorana modes in the presence of a repulsive interaction is studied in the standard semiconductor wire - metallic superconductor configuration. The effects of short-range Coulomb interaction, which is incorporated using a purely repulsive $δ$-function to model the strong screening effect due to the presence of the superconductor, are determined within a Hartree-Fock approximation of the effective Bogoliubov-De Gennes Hamiltonian that describes the low-energy physics of the wire. Through a numerical diagonalization procedure we obtain interaction corrections to the single particle eigenstates and calculate the extended topological phase diagram in terms of the chemical potential and the Zeeman energy. We find that, for a fixed Zeeman energy, the interaction shifts the phase boundaries to a higher chemical potential, whereas for a fixed chemical potential this shift can occur either to lower or to higher Zeeman energies. This effects can be interpreted as a renormalization of the g-factor due to the interaction. The minimum Zeeman energy needed to realize Majorana fermions decreases with increasing the strength of the Coulomb repulsion. Furthermore, we find that in wires with multi-band occupancy this effect can be enhanced by increasing the chemical potential, i. e. by occupying higher energy bands.
description: 18 pages, 7 figures
Editorial: Die Ambivalenz eines romanischen Europa
Creators: name: Nonnenmacher, Kai
Publisher: name: Universität Regensburg
Year: 2015
Subjects: subject: Editorial; Romanische Studien; Europa; Romania
subject: 840 Französische Literatur
subject: 850 Italienische, rumänische, rätoromanische Literatur

description: Empire latin: Romania und Europa – Nach dem ersten Heft – Personalia – Zeitschrift ‚Junge Romanistik‘ – Zu diesem Heft
Shape transformations of toroidal vesicles
Creators: name: Noguchi, Hiroshi
name: Sakashita, Ai
name: Imai, Masayuki
Publisher: name: arXiv
Year: 2014
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: Morphologies of genus-1 and 2 toroidal vesicles are studied numerically by dynamically triangulated membrane models and experimentally by confocal laser microscopy. Our simulation results reproduce shape transformations observed in our experiments well. At large reduced volumes of the genus-1 vesicles, obtained vesicle shapes agree with the previous theoretical prediction, in which axisymmetric shapes are assumed: double-necked stomatocyte, discoidal toroid, and circular toroid. However, for small reduced volumes, it is revealed that a non-axisymmetric discoidal toroid and handled discocyte exist in thermal equilibrium in the parameter range, in which the previous theory predicts axisymmetric discoidal shapes. Polygonal toroidal vesicles and subsequent budding transitions are also found. The entropy caused by shape fluctuations slightly modifies the stability of the vesicle shapes.
description: 9 pages, 12 figures
Magnetic polarizabilities of light mesons in SU(3) lattice gauge theory
Creators: name: Luschevskaya, E. V.
name: Solovjeva, O. E.
name: Kochetkov, Oleg A.
name: Teryaev, O. V.
Publisher: name: Universität Regensburg
Year: 2015
Subjects: subject: 530 Physik

description: We investigate the ground state energies of neutral pseudoscalar and vector meson in SU(3)SU(3) lattice gauge theory in the strong abelian magnetic field. The energy of ρ0ρ0 meson with zero spin projection sz=0sz=0 on the axis of the external magnetic field decreases, while the energies with non-zero spins sz=−1sz=−1 and +1 increase with the field. The energy of π0π0 meson decreases as a function of the magnetic field. We calculate the magnetic polarizabilities of pseudoscalar and vector mesons for lattice volume 184. For ρ0ρ0 with spin |sz|=1|sz|=1 and π0π0 meson the polarizabilities in the continuum limit have been evaluated. We do not observe any evidence in favour of tachyonic mode existence.
Problems with the Newton-Schrödinger Equations
Creators: name: Anastopoulos, C.
name: Hu, B. L.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We examine the origin of the Newton-Schrödinger equations (NSEs) that play an important role in alternative quantum theories (AQT), macroscopic quantum mechanics and gravity-induced decoherence. We show that NSEs for individual particles do not follow from general relativity (GR) plus quantum field theory (QFT). Contrary to what is commonly assumed, the NSEs are not the weak-field (WF), non-relativistic (NR) limit of the semi-classical Einstein equation (SCE) (this nomenclature is preferred over the `M\/oller-Rosenfeld equation') based on GR+QFT. The wave-function in the NSEs makes sense only as that for a mean field describing a system of $N$ particles as $N \rightarrow \infty$, not that of a single or finite many particles. From GR+QFT the gravitational self-interaction leads to mass renormalization, not to a non-linear term in the evolution equations of some AQTs. The WF-NR limit of the gravitational interaction in GR+QFT involves no dynamics. To see the contrast, we give a derivation of the equation (i) governing the many-body wave function from GR+QFT and (ii) for the non-relativistic limit of quantum electrodynamics (QED). They have the same structure, being linear, and very different from NSEs. Adding to this our earlier consideration that for gravitational decoherence the master equations based on GR+QFT lead to decoherence in the energy basis and not in the position basis, despite some AQTs desiring it for the `collapse of the wave function', we conclude that the origins and consequences of NSEs are very different, and should be clearly demarcated from those of the SCE equation, the only legitimate representative of semiclassical gravity, based on GR+QFT.
description: 18 pages. Invited paper for the Focus Issue on 'Gravitational quantum physics' in New Journal of Physics