cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Cosmological dynamics in spin-foam loop quantum cosmology: challenges and prospects
Creators: name: Craig, David A.
name: Singh, Parampreet
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We explore the structure of the spin foam-like vertex expansion in loop quantum cosmology and discuss properties of the corresponding amplitudes, with the aim of elucidating some of the expansion's useful properties and features. We find that the expansion is best suited for consideration of conceptual questions and for investigating short-time, highly quantum behavior. In order to study dynamics at cosmological scales, the expansion must be carried to very high order, limiting its direct utility as a calculational tool for such questions. Conversely, it is unclear that the expansion can be truncated at finite order in a controlled manner.
description: 16 pages, 3 figures. Invited contribution to journal special issue on cosmological applications of loop quantum gravity. Version 2: minor corrections and updated references. Matches published version
Numerical estimation of structure constants in the 3d Ising CFT through Markov chain UV sampler
Creators: name: Herdeiro, Victor
Publisher: name: arXiv
Year: 2017
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: [Herdeiro & Doyon Phys., Rev., E (2016)] https://journals.aps.org/pre/abstract/10.1103/PhysRevE.94.043322 introduced a numerical recipe, dubbed UV sampler, offering precise estimations of the CFT data of the planar two-dimensional critical Ising model. It made use of scale invariance emerging at the critical point in order to sample finite sublattice marginals of the infinite plane Gibbs measure of the model by producing ``holographic" boundary distributions. The main ingredient of the Markov chain MonteCarlo (MCMC) sampler is the invariance under dilation. This article presents a generalization to higher dimensions with the critical 3d Ising model. This leads to numerical estimations of a subset of the CFT data - scaling weights and structure constants - through fitting of measured correlation functions. The results are shown to agree with the recent most precise estimations from numerical bootstrap methods \href{https://arxiv.org/abs/1603.04436}{[Kos,\;Poland,\;Vicci\;\&\;Simmons-Duffin JHEP (2016)]}.
Massive vector field on curved background: non-minimal coupling, quantization and divergences
Creators: name: Buchbinder, Ioseph L.
name: Netto, Tibério de Paula
name: Shapiro, Ilya L.
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the effective action for the massive vector field theory non-minimally coupled to external gravitational field. Such a theory is an interesting model both from the theoretical side and also due to the various phenomenological applications to cosmology and astrophysics. The present work pretends to initiate a systematic study of its properties at the quantum level, by exploring free massive vector coupled to an external symmetric second-rank tensor. Stueckelberg scalar field is used to restore the gauge invariance. After that, by using a special gauge fixing and non-local in external fields change of variables, we diagonalize the bilinear form of the action and develop a consistent procedure to study the effective action. As a result we derive a complete non-linear structure of divergences of the effective action and discuss its properties.
description: 19 pages. A few references added. Accepted in PRD
Presentation: Credit Risk Analysis In Microfinance Institution (Study Case of MFI in Gunungkidul Regency, Special Region of Yogyakarta)
Creators: name: Akhmad Syari'udin
name: Thala Nugra Muharam
name: Astuti, Rini Dwi
name: Ambarwati, Sri Dwi Ari
name: Dyah Ayu Irawati
Publisher: name: Zenodo
Year: 2022

description: This material has presented on 1st International Conference on Advance Research in Social and Economic Science. October 25, 2022
Using Global Constraints and Reranking to Improve Cognates Detection
Creators: name: Bloodgood, Michael
name: Strauss, Benjamin
Publisher: name: arXiv
Year: 2017
Subjects: subject: Computation and Language (cs.CL)
subject: Machine Learning (cs.LG)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences
subject: I.2.6; I.2.7; I.5.1; I.5.4

description: Global constraints and reranking have not been used in cognates detection research to date. We propose methods for using global constraints by performing rescoring of the score matrices produced by state of the art cognates detection systems. Using global constraints to perform rescoring is complementary to state of the art methods for performing cognates detection and results in significant performance improvements beyond current state of the art performance on publicly available datasets with different language pairs and various conditions such as different levels of baseline state of the art performance and different data size conditions, including with more realistic large data size conditions than have been evaluated with in the past.
description: 10 pages, 6 figures, 6 tables; published in the Proceedings of the 55th Annual Meeting of the Association for Computational Linguistics, pages 1983-1992, Vancouver, Canada, July 2017
X-raying the Magellanic Clouds: a roadmap from XMM-Newton to Athena
Creators: name: Maitra, Chandreyee
Publisher: name: Zenodo
Year: 2022

description: The Magellanic Clouds are gas rich, irregular dwarf galaxies with active star formation histories. Because of the relatively short distance and low Galactic foreground extinction and absorption they are ideally suited for population studies of objects which are not always accessible in the Milky Way. Moreover, understanding the emission components of nearby galaxies is required to understand the unresolved emission from more distant galaxies. The XMM-Newton survey of the Magellanic Clouds have provided the deepest X-ray view of the inner regions of the Magellanic Clouds opening our windows to a systematic study of rich and diverse class of objects; predominantly HMXBs and SNRs. The eROSITA instrument onboard the Spectrum-Roentgen-Gamma satellite has finished its first four-sky surveys, which has provided a deep and complete coverage of the entire Magellanic system revolutionizing our understanding of our nearest star forming galaxies. I will present the first results in this regard including some newly discovered objects that are mainly HMXB pulsars, and a handful of peculiar systems i.e. HMXB pulsars found near the geometrical centre of their natal supernova remnant. Thanks to the very good spectral and spatial resolution coupled with its large effective area, Athena will be able to provide crucial insights into these systems as the X-ray binaries still in their propeller phase can be X-ray faint and requires high sensitivity to be detected. The parent SNRs can also be studied in much greater detail. The study will open windows into the birth properties of neutron star (NS) in binaries and probe the interaction between the accretion torque and the NS magnetic field at very low flux levels.
Wikimania Esino Lario
Creators: name: Pensa, Iolanda
Publisher: name: Zenodo
Year: 2022
Subjects: Wikipedia
Wikimania Esino Lario
Community engagement
Wikimedia Ecosystem

description: In 2016 Wikimania, the world Wikipedia gathering, was organized in Italy in a mountain village with 700 inhabitants. An entire community took action in the bidding process to candidate Esino Lario in the province of Lecco above Lake Como to an event that was traditionally hosted in large cities and prestigious venues such as Harvard University, the library of Alexandria in Egypt and the Barbican Centre in London. Wikimania was transformed from being a conference into a cultural initiative designed to affirm the centrality of every small place and its ability to contribute to universal knowledge. Esino Lario won the selection against the Philippine capital Manila and thanks to the involvement of the entire community, the collaboration of hundreds of volunteers and partners and the capillary of the organizational work, in June 2016 it hosted a group of 1368 participants from 71 nations, managing a widespread hospitality system with 738 beds, of which 400 in private homes. The event was an opportunity to renovate and adapt the public buildings involved in hosting over 100 conferences, distribute the optical fiber and document the entire territory and its heritage on OpenStreetMap, Wikimedia Commons and Wikipedia. In addition, the project has activated in 3 years training for almost 2000 people in the Province of Lecco involving 13 high schools, organizing a YouthHackaton and a WikiCamp for children, presentations at the Polytechnic University of Lecco and a series cooperation with students to publish cultural and turistic itineraries on Wikivoyage. Presentation by Iolanda Pensa about Wikimania Esino Lario 2016. Una comunità di montagna organizza il raduno mondiale di Wikipedia in Attivare le comunità di patrimonio adottando l’ecosistema Wikimedia: best practice in Italia e questioni aperte / Engaging Heritage communities adopting Wikimedia ecosystem: best practices in Italy and open questions with Pierluigi Feliciati, Luigi Catalani, Iolanda Pensa and Fedele Congedo, Italian National Conference on Public History dell’AIPH – Venezia-Mestre, 30/05/2022.
Correlations in eigenfunctions of quantum chaotic systems with sparse Hamiltonian matrices
Creators: name: Wang, Jiaozi
name: Wang, Wen-ge
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: In most realistic models for quantum chaotic systems, the Hamiltonian matrices in unperturbed bases have a sparse structure. We study correlations in eigenfunctions of such systems and derive explicit expressions for some of the correlation functions with respect to energy. The analytical results are tested in several models by numerical simulations. An application is given for a relation between transition probabilities.
description: 8 pages, 7 figures
title: The success factors of Instagram marketing for wedding planner businesses
title: The Austrian market
titleType: Subtitle
Creators: name: Bandel, Angelika
Publisher: name: FH CAMPUS 02 (CAMPUS 02 Fachhochschule der Wirtschaft)
Year: 2024
Subjects: subject: 659 Werbung, Öffentlichkeitsarbeit

description: Instagram wird im Hinblick auf die Vermarktung von Dienstleistungen für Hochzeiten immer wichtiger, da die Plattform von Personen im heiratsfähigen Alter unter anderem als Inspirationsquelle genutzt wird. Social Media Marketing ist ein erfolgreicher Weg um die Bekanntheit von Unternehmen zu steigern, die eigene Kompetenz als HochzeitsplanerIn aufzuzeigen und Kunden zu gewinnen. Das Ziel der vorliegenden Studie ist es aufzuzeigen, welche Faktoren dazu beitragen eine erfolgreiche Instagram Marketing Strategie für österreichische HochzeitsplanerInnen zu entwickeln. Es wird zunächst eine qualitative Studie über die aktuelle Nutzung von Social Media mit HochzeitsplanerInnen durchgeführt. Hierfür werden halbstrukturierte Interviews gemacht, die mit Hilfe der Inhaltsanalyse nach Mayring ausgewertet und anschließend interpretiert werden. Die Studie macht deutlich, dass Instagram und Social Media einen großen Einfluss auf die Interaktion zwischen KonsumentInnen und Unternehmen haben. Zentrale Ergebnisse der Arbeit haben gezeigt, dass es notwendig ist eine klare Strategie zu definieren, ein hohes Maß an Customer Engagement zu zeigen und vielfältige, qualitativ hochwertige Inhalte zu liefern, um in dieser aufstrebenden Branche erfolgreich zu sein. Weitere Forschungen im Bereich des Social Media Marketings in Bezug auf die Dienstleistung als Hochzeitsplaner könnten neuere Social Media Plattformen, wie zum Beispiel TikTok, untersuchen.
description: Instagram is becoming increasingly important for marketing a wedding planner service, as the platform is being used as a source of inspiration from potential customers. Social media is a successful way to increase visibility of a business, demonstrate the expertise as wedding planner and generate new customers. The aim of the research of this thesis is to show which factors contribute to a successful Instagram marketing strategy for an Austrian wedding planner. Therefore, a qualitative study is conducted on the current use of social media by wedding planners. The study utlises semi-structured interviews which are then evaluated using Mayring's content analysis. The outcome is divided into three major categories, which are then interpreted. According to the findings, Instagram and social media have a significant impact on the interaction between consumers and businesses. The core findings revealed that it is necessary to define a clear strategy, provide a high level of engagement with consumers and deliver diverse, high-quality content in order to succeed in the thriving industry. Further research in the field of social media marketing in relation to wedding planner services could examine new social media platforms such as TikTok.
From ultraluminous X-ray sources to ultraluminous supersoft sources: NGC 55 ULX, the missing link
Creators: name: Pinto, C.
name: Alston, W.
name: Soria, R.
name: Middleton, M. J.
name: Walton, D. J.
name: Sutton, A. D.
name: Fabian, A. C.
name: Earnshaw, H.
name: Urquhart, R.
name: Kara, E.
name: Roberts, T. P.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: In recent work with high-resolution grating spectrometers (RGS) aboard XMM-Newton Pinto et al. (2016) have discovered that two bright and archetypal ultraluminous X-ray sources (ULXs) have strong relativistic winds in agreement with theoretical predictions of high accretion rates. It has been proposed that such winds can become optically thick enough to block and reprocess the disk X-ray photons almost entirely, making the source appear as a soft thermal emitter or ultraluminous supersoft X-ray source (ULS). To test this hypothesis we have studied a ULX where the wind is strong enough to cause significant absorption of the hard X-ray continuum: NGC 55 ULX. The RGS spectrum of NGC 55 ULX shows a wealth of emission and absorption lines blueshifted by significant fractions of the light speed (0.01 - 0.20)c indicating the presence of a powerful wind. The wind has a complex dynamical structure with the ionization state increasing with the outflow velocity, which may indicate launching from different regions of the accretion disk. The comparison with other ULXs such as NGC 1313 X-1 and NGC 5408 X-1 suggests that NGC 55 ULX is being observed at higher inclination. The wind partly absorbs the source flux above 1 keV, generating a spectral drop similar to that observed in ULSs. The softening of the spectrum at lower (~ Eddington) luminosities and the detection of a soft lag agree with the scenario of wind clumps crossing the line of sight, partly absorbing and reprocessing the hard X-rays from the innermost region.
description: 20 pages, 20 figures, 7 tables, accepted for publication in MNRAS after moderate review. Conclusions have not been changed
Probing the Extragalactic Cosmic Rays origin with gamma-ray and neutrino backgrounds
Creators: name: Globus, Noemie
name: Allard, Denis
name: Parizot, Etienne
name: Piran, Tsvi
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: GeV-TeV gamma-rays and PeV-EeV neutrino backgrounds provide a unique window on the nature of the ultra-high-energy cosmic-rays (UHECRs). We discuss the implications of the recent Fermi-LAT data regarding the extragalactic gamma-ray background (EGB) and related estimates of the contribution of point sources as well as IceCube neutrino data on the origin of the UHECRs. We calculate the diffuse flux of cosmogenic $γ$-rays and neutrinos produced by the UHECRs and derive constraints on the possible cosmological evolution of UHECR sources. In particular, we show that the mixed-composition scenario considered in \citet{Globus2015b}, which is in agreement with both (i) Auger measurements of the energy spectrum and composition up to the highest energies and (ii) the ankle-like feature in the light component detected by KASCADE-Grande, is compatible with both the Fermi-LAT measurements and with current IceCube limits. We also discuss the possibility for future experiments to detect associated cosmogenic neutrinos and further constrain the UHECR models, including possible subdominant UHECR proton sources.
description: 6 pages, 4 figures, accepted without revision in ApJ Letters
OSCAR-P and aMLLib, experiments results and datasets
Creators: name: Roberto Sala
name: Enrico Galimberti
Publisher: name: Zenodo
Year: 2024

description: All the folders contain the log and the models relative to the experimental campaigns we performed to validate our workflow. In particular,

Mask detection application: asynchronous test with 10-videos batch, asynchronous test with different batch sizes, test on physical cluster and synchronous test;

Video searcher application;

Recipe transcriber application.

 

Moreover, we provide a folder called "OSCAR-P_utility" with some useful scripts to retrieve the results, the "LinksToCode.txt" file, where you can find the links to OSCAR-P and aMLLibrary and a folder "Examples input files" with templates of the input files for both OSCAR-P and aMLLibrary.
Bounds on complex polarizabilities and a new perspective on scattering by a lossy inclusion
Creators: name: Milton, Graeme W.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Here we obtain explicit formulae for bounds on the complex electrical polarizability at a given frequency of an inclusion with known volume that follow directly from the quasistatic bounds of Bergman and Milton on the effective complex dielectric constant of a two-phase medium. We also describe how analogous bounds on the orientationally averaged bulk and shear polarizabilities at a given frequency can be obtained from bounds on the effective complex bulk and shear moduli of a two-phase medium obtained by Milton, Gibiansky and Berryman, using the quasistatic variational principles of Cherkaev and Gibiansky. We also show how the polarizability problem and the acoustic scattering problem can both be reformulated in an abstract setting as "Y -problems". In the acoustic scattering context, to avoid explicit introduction of the Sommerfeld radiation condition, we introduce auxilliary fields at infinity and an appropriate "constitutive law" there, which forces the Sommerfeld radiation condition to hold. As a consequence we obtain minimization variational principles for acoustic scattering that can be used to obtain bounds on the complex backwards scattering amplitude. Some explicit elementary bounds are given.
description: 27 pages, 1 figure
Chính sách mã nhận diện thường trực (PID) cho Đám mây Khoa học Mở châu Âu (EOSC)
Creators: name: Nghĩa, Lê Trung
Publisher: name: Zenodo
Year: 2023
Subjects: mã nhận diện thường trực (PID)
Đám mây Khoa học Mở châu Âu (EOSC)
Chính sách PID

description: Đây là bản dịch của tài liệu 'A Persistent Identifier (PID) policy for the European Open Science Cloud - Report from the European Open Science Cloud FAIR and Architecture Working Groups' của Ủy ban châu Âu, xuất bản tháng 10/2020. Bản gốc tiếng Anh có tại địa chỉ: https://op.europa.eu/da/publication-detail/-/publication/35c5ca10-1417-11eb-b57e-01aa75ed71a1/language-en
description: {"references": ["EC (2020): A Persistent Identifier (PID) policy for the European Open Science Cloud - Report from the European Open Science Cloud FAIR and Architecture Working Groups. https://op.europa.eu/da/publication-detail/-/publication/35c5ca10-1417-11eb-b57e-01aa75ed71a1/language-en"]}
OSCAR-P and aMLLib, experiments results and datasets
Creators: name: Roberto Sala
name: Enrico Galimberti
Publisher: name: Zenodo
Year: 2024

description: All the folders contain the log and the models relative to the experimental campaigns we performed to validate our workflow. In particular,

Mask detection application: asynchronous test with 10-videos batch, asynchronous test with different batch sizes, test on physical cluster and synchronous test;

Video searcher application;

Recipe transcriber application.

 

Moreover, we provide a folder called "OSCAR-P_utility" with some useful scripts to retrieve the results and the "LinksToCode.txt" file, where you can find the links to OSCAR-P and aMLLibrary.
Calculation of Momentum Distribution Function of a Non-thermal Fermionic Dark Matter
Creators: name: Biswas, Anirban
name: Gupta, Aritra
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The most widely studied scenario in dark matter phenomenology is the thermal WIMP scenario. Inspite of numerous efforts to detect WIMP, till now we have no direct evidence for it. A possible explanation for this non-observation of dark matter could be because of its very feeble interaction strength and hence, failing to thermalise with the rest of the cosmic soup. In other words, the dark matter might be of non-thermal origin where the relic density is obtained by the so-called freeze-in mechanism. Furthermore, if this non-thermal dark matter is itself produced substantially from the decay of another non-thermal mother particle, then their distribution functions may differ in both size and shape from the usual equilibrium distribution function. In this work, we have studied such a non-thermal (fermionic) dark matter scenario in the light of a new type of $U(1)_{\rm B-L}$ model. The $U(1)_{\rm B-L}$ model is interesting, since, besides being anomaly free, it can give rise to neutrino mass by Type II see-saw mechanism. Moreover, as we will show, it can accommodate a non-thermal fermionic dark matter as well. Starting from the collision terms, we have calculated the momentum distribution function for the dark matter by solving a coupled system of Boltzmann equations. We then used it to calculate the final relic abundance, as well as other relevant physical quantities. We have also compared our result with that obtained from solving the usual Boltzmann (or rate) equations directly in terms of comoving number density, $Y$. Our findings suggest that the latter approximation is valid only in cases where the system under study is close to equilibrium, and hence should be used with caution.
description: 23 figures, 3 Tables, 45 pages, Version published in JCAP
Home School Partnership in Promoting Social Skills in Basic Education Learners 15-Jul-2023 14-57-16(1).pdf
Creators: name: Orji, Evelyn   Ijeoma
Publisher: name: figshare
Year: 2023
Subjects: classificationCode: 399999
subject: Other education not elsewhere classified

description: Childhood is a very critical learning stage in human growth and development, which makes it important that children be brought up well by both home and school (through the basic education curriculum). Therefore, how children are socialized and the quality of learning experiences they acquire from parents, teachers, caregivers, peers, and others would likely predict their personality and eventual adjustment in society. Negative….
Constructing optimal quantum error correcting codes from absolute maximally entangled states
Creators: name: Raissi, Zahra
name: Gogolin, Christian
name: Riera, Arnau
name: Acín, Antonio
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Absolutely maximally entangled (AME) states are pure multi-partite generalizations of the bipartite maximally entangled states with the property that all reduced states of at most half the system size are in the maximally mixed state. AME states are of interest for multipartite teleportation and quantum secret sharing and have recently found new applications in the context of high-energy physics in toy models realizing the AdS/CFT-correspondence. We work out in detail the connection between AME states of minimal support and classical maximum distance separable (MDS) error correcting codes and, in particular, provide explicit closed form expressions for AME states of $n$ parties with local dimension $q$ a power of a prime for all $q \geq n-1$. Building on this, we construct a generalization of the Bell-basis consisting of AME states and develop a stabilizer formalism for AME states. For every $q \geq n-1$ prime we show how to construct QECCs that encode a logical qudit into a subspace spanned by AME states. Under a conjecture for which we provide numerical evidence, this construction produces a family of quantum error correcting codes $[\![n,1,n/2]\!]_q$ for $n$ even, saturating the quantum Singleton bound. We show that our conjecture is equivalent to the existence of an operator whose support cannot be decreased by multiplying it with stabilizer products and explicitly construct the codes up to $n = 8$.
description: 14 pages, new QECCs and stabilizers added, revised introduction, typos corrected
Strain control of real-and lattice-spin currents in a silicene junction
Creators: name: Phonapha, Sarayut
name: Suwanvarangkoon, Assanai
name: Soodchomshom, Bumned
Publisher: name: arXiv
Year: 2017
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We investigate real- and lattice-spin currents controlled by strain in a silicene-based junction, where chemical potential, perpendicular electric field and circularly polarized light are applied into the strained barrier. We find that the junction yields strain filtering effect with perfect strain control of real- (or lattice-) spin currents. (i) By applying electric field without circularly polarized light we show that total current is carried by pure lattice-spin up (or down) electrons tunable by strain. (ii) When circularly polarized light is irradiated onto silicene sheet without applying electric field, total current is carried by pure real-spin up (or down) electrons tunable by strain. High conductance peaks associated with pure real-(or lattice-) spin currents in case ii(or i) occur at specific magnitude of strain, yielding strain filtering effect. Magnitudes of filtered strain due to pure real- (or lattice-) spin currents may be tunable by varying chemical potential. Sensitivity may be enhanced by increasing thickness of strained barrier. Significantly, (iii) when both perpendicular electric field and circularly polarized light are applied, the total current is carried by three species of electron groups tunable by strain. This may lead to controllable numbers of electron species to transport. This result shows that strain filtering effect in a silicene-based junction is quite different from that in graphene junction. Our work reveals potential of silicene as a nano-electro-mechanical device and spin-valleytronic applications.
description: 25 pages, 8 Figures, 1 table (accepted in physics letters A)
On (in)stabilities of perturbations in mimetic models with higher derivatives
Creators: name: Zheng, Yunlong
name: Shen, Liuyuan
name: Mou, Yicen
name: Li, Mingzhe
Publisher: name: arXiv
Year: 2017
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Usually when applying the mimetic model to the early universe, higher derivative terms are needed to promote the mimetic field to be dynamical. However such models suffer from the ghost and/or the gradient instabilities and simple extensions cannot cure this pathology. We point out in this paper that it is possible to overcome this difficulty by considering the direct couplings of the higher derivatives of the mimetic field to the curvature of the spacetime.
description: 10 pages, 1 figure, the version accepted by JCAP
Deep Learning the Quantum Phase Transitions in Random Electron Systems: Applications to Three Dimensions
Creators: name: Ohtsuki, Tomi
name: Ohtsuki, Tomoki
Publisher: name: arXiv
Year: 2016
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Three-dimensional random electron systems undergo quantum phase transitions and show rich phase diagrams. Examples of the phases are the band gap insulator, Anderson insulator, strong and weak topological insulators, Weyl semimetal, and diffusive metal. As in the previous paper on two-dimensional quantum phase transitions [J. Phys. Soc. Jpn. vol. 85, 123706 (2016)], we use an image recognition algorithm based on a multilayered convolutional neural network to identify which phase the eigenfunction belongs to. The Anderson model for localization-delocalization transition, the Wilson--Dirac model for topological insulators, and the layered Chern insulator model for Weyl semimetal are studied. The situation where the standard transfer matrix approach is not applicable is also treated by this method.
description: 16 pages, 6 figures. Text and references revised. Open access
On stochastic differential equations with arbitrarily slow convergence rates for strong approximation in two space dimensions
Creators: name: Gerencsér, Máté
name: Jentzen, Arnulf
name: Salimova, Diyora
Publisher: name: arXiv
Year: 2017
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: In the recent article [Jentzen, A., Müller-Gronbach, T., and Yaroslavtseva, L., Commun. Math. Sci., 14(6), 1477--1500, 2016] it has been established that for every arbitrarily slow convergence speed and every natural number $d \in \{4,5,\ldots\}$ there exist $d$-dimensional stochastic differential equations (SDEs) with infinitely often differentiable and globally bounded coefficients such that no approximation method based on finitely many observations of the driving Brownian motion can converge in absolute mean to the solution faster than the given speed of convergence. In this paper we strengthen the above result by proving that this slow convergence phenomena also arises in two ($d=2$) and three ($d=3$) space dimensions.
description: 25 pages
Policy-compliant data processing: RDF-based restrictions for data-protection
Creators: name: Lieber, Sven
Publisher: name: Zenodo
Year: 2019
Subjects: RDF
axioms
restrictions
constraints
ontology engineering

description: The presentation of my paper for the doctoral consortium at ISWC 2019 in Auckland, New Zealand.

 My PhD plan of how to extend Ontology Engineering activities with guidelines regarding the modeling of restrictions, i.e. considering both axioms and constraints.
Light-matter interactions in multi-element resonators
Creators: name: Genes, Claudiu
name: Dantan, Aurélien
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate structural resonances in multi-element optical resonators and provide a roadmap for the description of the interaction of single extended cavity modes with quantum emitters or mechanical resonators. Using a first principle approach based on the transfer matrix formalism we analyze, both numerically and analytically, the static and dynamical properties of three- and four-mirror cavities. We investigate in particular conditions under which the confinement of the field in specific subcavities allows for enhanced light-matter interactions in the context of cavity quantum electrodynamics and cavity optomechanics.
Symmetry breaking by heating in a continuous opinion model
Creators: name: Anteneodo, Celia
name: Crokidakis, Nuno
Publisher: name: arXiv
Year: 2017
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the critical behavior of a continuous opinion model, driven by kinetic exchanges in a fully-connected population. Opinions range in the real interval $[-1,1]$, representing the different shades of opinions against and for an issue under debate. Individual's opinions evolve through pairwise interactions, with couplings that are typically positive, but a fraction $p$ of negative ones is allowed. Moreover, a social temperature parameter $T$ controls the tendency of the individual responses towards neutrality. Depending on $p$ and $T$, different collective states emerge: symmetry broken (one side wins), symmetric (tie of opposite sides) and absorbing neutral (indecision wins). We find the critical points and exponents that characterize the phase transitions between them. The symmetry breaking transition belongs to the usual Ising mean-field universality class, but the absorbing-phase transitions, with $β=0.5$, are out of the paradigmatic directed percolation class. Moreover, ordered phases can emerge by increasing social temperature.
description: 7 pages, 7 figures, to appear in Physical Review E
Effect of Al2O3 on the operation of SiNX-based MIS RRAMs
Creators: name: Mavropoulis, A. E.
name: Vasileiadis, N.
name: Normand, P.
name: Theodorou, C.
name: Sirakoulis, G. Ch.
name: Kim, S.
name: Dimitrakis, P.
Publisher: name: arXiv
Year: 2025
Subjects: subject: Applied Physics (physics.app-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The role of a 3 nm Al2O3 layer on top of stoichiometric LPCVD SiNx MIS RRAM cells is investigated by using various electrical characterization techniques. The conductive filament formation is explained, and a compact model is used to fit the current voltage curves and find its evolution during each operation cycle. The conduction in SiNx is also studied.
Geometric explanation of anomalous finite-size scaling in high dimensions
Creators: name: Grimm, Jens
name: Elçi, Eren Metin
name: Zhou, Zongzheng
name: Garoni, Timothy M.
name: Deng, Youjin
Publisher: name: arXiv
Year: 2016
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We give an intuitive geometric explanation for the apparent breakdown of standard finite-size scaling in systems with periodic boundaries above the upper critical dimension. The Ising model and self-avoiding walk are simulated on five-dimensional hypercubic lattices with free and periodic boundary conditions, by using geometric representations and recently introduced Markov-chain Monte Carlo algorithms. We show that previously observed anomalous behaviour for correlation functions, measured on the standard Euclidean scale, can be removed by defining correlation functions on a scale which correctly accounts for windings.
description: 5 pages, 4 figures
Statistical Analysis of Precipitation Events
Creators: name: Korolev, V. Yu.
name: Gorshenin, A. K.
name: Gulev, S. K.
name: Belyaev, K. P.
name: Grusho, A. A.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Probability (math.PR)
subject: Applications (stat.AP)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: In the present paper we demonstrate the results of a statistical analysis of some characteristics of precipitation events and propose a kind of a theoretical explanation of the proposed models in terms of mixed Poisson and mixed exponential distributions based on the information-theoretical entropy reasoning. The proposed models can be also treated as the result of following the popular Bayesian approach.
description: 5 pages, 4 figures; ICNAAM 2016
Layer-dependent Ferromagnetism in a van der Waals Crystal down to the Monolayer Limit
Creators: name: Huang, Bevin
name: Clark, Genevieve
name: Navarro-Moratalla, Efren
name: Klein, Dahlia R.
name: Cheng, Ran
name: Seyler, Kyle L.
name: Zhong, Ding
name: Schmidgall, Emma
name: McGuire, Michael A.
name: Cobden, David H.
name: Yao, Wang
name: Xiao, Di
name: Jarillo-Herrero, Pablo
name: Xu, Xiaodong
Publisher: name: arXiv
Year: 2017
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Since the celebrated discovery of graphene, the family of two-dimensional (2D) materials has grown to encompass a broad range of electronic properties. Recent additions include spin-valley coupled semiconductors, Ising superconductors that can be tuned into a quantum metal, possible Mott insulators with tunable charge-density waves, and topological semi-metals with edge transport. Despite this progress, there is still no 2D crystal with intrinsic magnetism, which would be useful for many technologies such as sensing, information, and data storage. Theoretically, magnetic order is prohibited in the 2D isotropic Heisenberg model at finite temperatures by the Mermin-Wagner theorem. However, magnetic anisotropy removes this restriction and enables, for instance, the occurrence of 2D Ising ferromagnetism. Here, we use magneto-optical Kerr effect (MOKE) microscopy to demonstrate that monolayer chromium triiodide (CrI3) is an Ising ferromagnet with out-of-plane spin orientation. Its Curie temperature of 45 K is only slightly lower than the 61 K of the bulk crystal, consistent with a weak interlayer coupling. Moreover, our studies suggest a layer-dependent magnetic phase transition, showcasing the hallmark thickness-dependent physical properties typical of van der Waals crystals. Remarkably, bilayer CrI3 displays suppressed magnetization with a metamagnetic effect, while in trilayer the interlayer ferromagnetism observed in the bulk crystal is restored. Our work creates opportunities for studying magnetism by harnessing the unique features of atomically-thin materials, such as electrical control for realizing magnetoelectronics, and van der Waals engineering for novel interface phenomena.
description: To appear in Nature
1/f and Random Telegraph Noise of Single-Layer Graphene Devices with Interdigitated Electrodes
Creators: name: Samara, Georgia
name: Vasileiadis, Nikolaos
name: Mavropoulis, Alexandros
name: Theodorou, Christoforos
name: Papagelis, Konstantinos
name: Dimitrakis, Panagiotis
Publisher: name: arXiv
Year: 2025
Subjects: subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Single-layer Graphene (SLG) is a promising material for sensing applications. High performance graphene sensors can be achieved when Interdigitated Electrodes (IDE) are used. In this research work, we fabricated SLG micro-ribbon (GMR) devices with IDE having different geometric parameters. 1/f noise behavior was observed in all of the examined devices, and in some cases random telegraph noise (RTN) signals suggesting that carrier trapping/de-trapping is taking place. Our experimental results indicate that the geometrical characteristics can have a crucial impact on device performance, due to the direct area dependence of the noise level.
Web-based integrated solutions for Cultural Heritage
Creators: name: Sofia, Pescarin
name: Alberto, Bucciero
name: Alessandra, Chirivì
name: Bruno, Fanini
Publisher: name: Zenodo
Year: 2022
Subjects: Web3d, Infrastruttura, Heritage Science, Data-Space, Museo Virtuale

description: We are assisting today to the increased need of web-based Integrated solutions in and for Cultural Heritage. This presentation will offer a national overview on the different activities in the field of Cultural Heritage that are increasingly requiring the use of the network, from the design of interactive media to field acquisition (i.e. in archaeological sites), from data analysis and simulation to 3d model semantic annotation, from collaboration in virtual environments to web3d applications for museums and monuments. Example of recent tools, services and applications will be provided (as for Aton, Emviq, 3D Hop and Movida). The challenges and potentialities offered by infrastructural projects such as ERIHS will be set as the turning point that will lead, in the next decade, to new Data Spaces, CH research National Cloud and CH Italian digital library.
¿Cómo detectar fake news?
Creators: name: Apablaza-Campos, Alexis
Publisher: name: Zenodo
Year: 2023
Subjects: fake news
disinformation
misinformation
mal-information
fact checking
fact checkers
desinformación
noticias falsas
verificación de datos

description: Resumen Definiciones sobre fake news y por qué debemos usar el término desinformación. Casos de estudio de desinformación en sitios web y redes sociales. Verificadores de datos: categorías y fact checkers destacados. Abstract Definitions about fake news. Case studies of disinformation, misinformation and mal-information on websites and social media. Fact checking: categories and featured fact checkers.
description: Contexto: presentación a estudiantes de "Talleres de Invierno" de la Universidad UNIACC (Chile)
description: {"references": ["Apablaza-Campos, A. (3 de noviembre de 2020). Fake news: \u00bfc\u00f3mo detectar noticias falsas? [Talleres UNIACC] . Obtenido de Observatorio de Cibermedios UPF: https://observatoriocibermedios.upf.edu/fake-news-como-detectar-noticias-falsas-talleres-uniacc", "Apablaza-Campos, A. (2022a) Desinformaci\u00f3n: \u00bfc\u00f3mo combatir las noticias falsas? Apunte de clase Unidad 3, Periodismo Digital y Nuevos Medios, Universidad UNIACC.", "Apablaza-Campos, A. (26 de julio de 2022b). \u00bfC\u00f3mo detectar la desinformaci\u00f3n? [Taller de invierno UNIACC 2022] . Obtenido de Observatorio de Cibermedios UPF: https://observatoriocibermedios.upf.edu/como-detectar-fake-news-2022", "Calder\u00f3n Avellaneda, C. (27 de agosto de 2019). Twitter. Obtenido de https://twitter.com/CesarCalderon/status/1166391567524990977", "Fund\u00e9u RAE. (19 de abril de 2021). Verificaci\u00f3n, mejor que fact-checking. Obtenido de Fundaci\u00f3n del Espa\u00f1ol Urgente: https://www.fundeu.es/recomendacion/verificacion-mejor-que-fact-checking/", "Goldshlager, K. (11 de agosto de 2020). Nuevas calificaciones para los socios de verificaci\u00f3n de informaci\u00f3n. Obtenido de Meta Journalism Project: https://www.facebook.com/journalismproject/programs/third-party-fact-checking/new-ratings?content_id=jhYXLihGOpViH6r&__tn__=HHH-R", "Maldito Bulo. (31 de agosto de 2018). Dejemos de hablar de 'FAKE NEWS' y de 'NOTICIAS FALSAS'. Obtenido de Maldita.es: https://maldita.es/malditobulo/dejemos-de-hablar-de-fake-news-y-de-noticias-falsas", "Rodr\u00edguez, C. (3 de noviembre de 2017). \"Fake news\", palabra del a\u00f1o del Diccionario Oxford. Obtenido de El Mundo: https://www.elmundo.es/cultura/cine/2017/11/03/59fc80f4468aebd1508b46a0.html", "Wardle, C., Kelis Nielsen, R., Mantzarlis, A., & Jim\u00e9nez Cruz, C. (12 de marzo de 2018). Seis puntos clave del informe sobre desinformaci\u00f3n del Grupo de expertos de la Comisi\u00f3n Europea. Obtenido de Maldita.es: https://maldita.es/maldita/20180312/seis-puntos-claves-del-informe-sobre-desinformacion-del-grupo-de-expertos-de-la-comision-europea/"]}
Non-singular spacetimes with a negative cosmological constant: III. Stationary solutions with matter fields
Creators: name: Chruściel, Piotr T.
name: Delay, Erwann
name: Klinger, Paul
Publisher: name: arXiv
Year: 2017
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: Differential Geometry (math.DG)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: Generalising the results in arXiv:1612.00281, we construct infinite-dimensional families of non-singular stationary space times, solutions of Yang-Mills-Higgs-Einstein-Maxwell-Chern-Simons-dilaton-scalar field equations with a negative cosmological constant. The families include an infinite-dimensional family of solutions with the usual AdS conformal structure at conformal infinity.
description: 27 pages, v2: journal accepted version
MODERN TRANSFORMATION IN THE FORM OF A MIXED REPUBLIC
Creators: name: Turdiev, Khayitjon
Publisher: name: Zenodo
Year: 2024

description: The article analyzes the mixed or semi-presidential form of government. The form of government as an element of the form of government is one of the most significant categories of the theory of state and law. This category allows us to identify the most typical features that make it possible to unite into several classification groups the majority of states in the world, both those that exist at present and those that existed in the historical past. Historical analogs of such an organization of supreme power are given. Distinctive features of a mixed form of government are revealed: separation of powers, rationalization, arbitration, etc. Using the example of Uzbekistan, unique, hybrid varieties of the semi-presidential form of government are defined and characterized.
Massive Fermi Gas in the Expanding Universe
Creators: name: Trautner, Andreas
Publisher: name: arXiv
Year: 2016
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Quantum Gases (cond-mat.quant-gas)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The behavior of a decoupled ideal Fermi gas in a homogeneously expanding three-dimensional volume is investigated, starting from an equilibrium spectrum. In case the gas is massless and/or completely degenerate, the spectrum of the gas can be described by an effective temperature and/or an effective chemical potential, both of which scale down with the volume expansion. In contrast, the spectrum of a decoupled massive and non-degenerate gas can only be described by an effective temperature if there are strong enough self-interactions such as to maintain an equilibrium distribution. Assuming perpetual equilibration, we study a decoupled gas which is relativistic at decoupling and then is red-shifted until it becomes non-relativistic. We find expressions for the effective temperature and effective chemical potential which allow us to calculate the final spectrum for arbitrary initial conditions. This calculation is enabled by a new expansion of the Fermi-Dirac integral, which is for our purpose superior to the well-known Sommerfeld expansion. We also compute the behavior of the phase space density under expansion and compare it to the case of real temperature and real chemical potential. Using our results for the degenerate case, we also obtain the mean relic velocity of the recently proposed non-thermal cosmic neutrino background.
description: 19 pages, 16 figures; v2:references added, matches published version