cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Numerical evidence for a chiral spin liquid in the XXZ antiferromagnetic Heisenberg model on the kagome lattice at $m=\frac{2}{3}$ magnetization
Creators: name: Kumar, Krishna
name: Changlani, Hitesh J.
name: Clark, Bryan K.
name: Fradkin, Eduardo
Publisher: name: arXiv
Year: 2016
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We perform an exact diagonalization study of the spin-$1/2$ XXZ Heisenberg antiferromagnet on the kagome lattice at finite magnetization $m = \frac{2}{3}$ with an emphasis on the XY point ($J_z = 0$), and in the presence of a small chiral term. Recent analytic work by Kumar, Sun and Fradkin [Phys. Rev. B 90, 174409 (2014)] on the same model, using a newly developed flux attachment transformation, predicts a plateau at this value of the magnetization described by a chiral spin liquid (CSL) with a spin Hall conductance of $σ_{xy} = \frac{1}{2}$. Such a state is topological in nature, has a ground state degeneracy and exhibits fractional excitations. We analyze the degeneracy structure in the low energy manifold, identify the candidate topological states and use them to compute the modular matrices and Chern numbers all of which strongly agree with expected theoretical behavior for the $σ_{xy} = \frac{1}{2}$ CSL. We argue that the evidence suggests the CSL is robust even in the limit of zero external chirality.
description: 12 pages, 10 figures including appendices
Making the school Smart: the interactive whiteboard against disparities in children stemming from low metacognitive skills
Creators: name: Cadamuro, Alessia
name: Bisagno, Elisa
name: Di Bernardo, Gian Antonio
name: Vezzali, Loris
name: Versari, Annalisa
Publisher: name: Journal of e-Learning and Knowledge Society
Year: 2020

description: The demand for an increasingly differentiated education, which takes into account the individual differences of children to stimulate effective learning, accompanies the introduction of new technologies at school. Amongst these, the Interactive Whiteboard (IWB), which allows multimodality and sharing of contents, is one of the most widespread tools in schools. The aim of the study was to test with a sample of primary school children the impact of a teaching session with the use of the IWB (vs. traditional lessons) on knowledge performance. In addition, we were interested in investigating the role of metacognition as a potential moderator on learning effects. Our results revealed an advantage of IWB use in learning achievement. Notably, the increase in learning outcomes only occurred among children with low metacognitive skills. This shows that new technologies can play an important role both per se and in supporting learning processes, especially of less metacognitive students, therefore contributing to reduce the gap between children with differential metacognitive skills. The results are analyzed in light of the important role in the nowadays world of Information and Communication Technologies, which can become an extremely relevant and appealing educational and cultural compensation tool.
description: Journal of e-Learning and Knowledge Society, Vol 16 No 1 (2020): Journal of e-Learning and Knowledge Society - Special Issue on "Smart Learning in Smart Cities"
The Analytic Structure of Non-Global Logarithms: Convergence of the Dressed Gluon Expansion
Creators: name: Larkoski, Andrew J.
name: Moult, Ian
name: Neill, Duff
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Non-global logarithms (NGLs) are the leading manifestation of correlations between distinct phase space regions in QCD and gauge theories and have proven a challenge to understand using traditional resummation techniques. Recently, the dressed gluon expansion was introduced that enables an expansion of the NGL series in terms of a "dressed gluon" building block, defined by an all-orders factorization theorem. Here, we clarify the nature of the dressed gluon expansion, and prove that it has an infinite radius of convergence as a solution to the leading logarithmic and large-$N_c$ master equation for NGLs, the Banfi-Marchesini-Smye (BMS) equation. The dressed gluon expansion therefore provides an expansion of the NGL series that can be truncated at any order, with reliable uncertainty estimates. In contrast, manifest in the results of the fixed-order expansion of the BMS equation up to 12-loops is a breakdown of convergence at a finite value of $α_s$log. We explain this finite radius of convergence using the dressed gluon expansion, showing how the dynamics of the buffer region, a region of phase space near the boundary of the jet that was identified in early studies of NGLs, leads to large contributions to the fixed order expansion. We also use the dressed gluon expansion to discuss the convergence of the next-to-leading NGL series, and the role of collinear logarithms that appear at this order. Finally, we show how an understanding of the analytic behavior obtained from the dressed gluon expansion allows us to improve the fixed order NGL series using conformal transformations to extend the domain of analyticity. This allows us to calculate the NGL distribution for all values of $α_s$log from the coefficients of the fixed order expansion.
description: 37 pages + Appendices, 11 figures
Exact coefficients of finite-size corrections in the Ising model with Brascamp-Kunz boundary conditions and their relationships for strip and cylindrical geometries
Creators: name: Izmailian, Nikolay Sh.
name: Kenna, Ralph
name: Papoyan, Vladimir V.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We derive exact finite-size corrections for the free energy $F$ of the Ising model on the ${\cal M} \times 2 {\cal N}$ square lattice with Brascamp-Kunz boundary conditions. We calculate ratios $r_p(ρ)$ of $p$th coefficients of F for the infinitely long cylinder (${\cal M} \to \infty$) and the infinitely long Brascamp-Kunz strip (${\cal N} \to \infty$) at varying values of the aspect ratio $ρ={(\cal M}+1) / 2{\cal N}$. Like previous studies have shown for the two-dimensional dimer model, the limiting values $p \to \infty$ of $r_p(ρ)$ exhibit abrupt anomalous behaviour at certain values of $ρ$. These critical values of $ρ$ and the limiting values of the finite-size-expansion-coefficient ratios differ, however, between the two models.
description: To be published in Journal of Physics A: Mathematical and Theoretical. Supplementary material included with the paper
Emergence and Re-emergence of Lassa fever Cases in Bauchi State, Northeastern Nigeria, 2012 - 2021
Creators: name: AM, Lawal SM, Gandi AY, Ismaila H, Misau YA, Balogun MS, Ballah A, Maigoro
Publisher: name: figshare
Year: 2022
Subjects: Diseases

description: Background: Bauchi state has recorded seasonal outbreaks of Lassa fever (L.F) with increasing magnitudes, widening geographical spread and worsening morbidity and mortality since 2012. Another outbreak of LF was declared in the state on the 24th of October, 2020. We investigated the outbreak to conduct its epidemiologic characterization in the state between October, 2020 and May, 2021. Methods: We conducted active case searches for LF, reviewed hospital and mortuary records, case investigation forms, line-listed and followed up contacts, collected blood samples from suspected and high-risk cases for laboratory diagnosis. State-wide verbal autopsy, environmental assessments and risk analysis were also performed. We defined a suspected case as any person working or living within the affected LGAs and environs with fever of 380C, not responding to usual anti-malarial or antibiotics within 24-72 hours with or without hemorrhagic symptoms, travel history, or contact with a known case between October, 2020 and May, 2021. A confirmed case was defined as any suspected case with laboratory confirmation (positive PCR and/or IgM antibody). We calculated frequencies/proportions and associations. Results: Of 108 line-listed suspected cases, 29 were PCR-confirmed with LF (A.R.= 26.9%) with a case fatality rate (CFR) of 33.3%. The median age of positive cases was 32 years (range: 0-70 years) and the majority, 20(68.9%), were females. Cases are now being reported from other parts of the state 11(37.9%), with Toro LGA, in Bauchi South Senatorial zone accounting for most of the confirmed cases 12(41.4%) and mortalities. Conclusions: The L.F outbreak in Bauchi state was characterized by changing geographical spread and a high CFR. We Intensified risk communication and social mobilization activities to increase case detection and isolation. We recommended strengthening of the state’s surveillance system, development of state Emergency Preparedness & Response Plan (EPR), and implementations of preventive strategies.
Doubly heavy tetraquarks: heavy quark bindings and chromomagnetically mixings
Creators: name: Liu, Xin-Yue
name: Zhang, Wen-Xuan
name: Jia, Duojie
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We introduce an enhanced binding energy $B_{QQ}$ between heavy-heavy quarks $QQ$ and a flux-tube correction into the chromomagnetic interaction model to study nonstrange doubly-heavy tetraquarks $T_{QQ}$ ($Q=c,b)$. A simple relation in terms of baryon masses is proposed to estimate the binding energies $B_{QQ}$ and thereby map the flux-tube corrections in doubly-heavy tetraquarks $T_{cc}$, $T_{bb}$ and $T_{bc}$. Our computation via diagonalization of chromomagnetic interaction predicts the doubly charmed tetraquark $T_{cc}$ (in color rep. $\bar{3}_{c}\otimes 3_{c}$) and $T_{cc}^{\ast }$ (in $6_{c}\otimes \bar{6}_{c}$) with $IJ^{P}=01^{+}$ to have masses of $3879.2$ MeV and $4287.6$ MeV, respectively, with the former being in consistent with the measured mass $3874.7\pm 0.05$ MeV of the doubly charmed tetraquark $T_{cc}(1^{+})=cc\bar{u}\bar{d}$ discovered by LHCb. Further mass predictions are given of the doubly bottom tetraquarks $T_{bb}$ and the bottom-charmed tetraquarks $T_{bc}$ with $J^{P}=0^{+},1^{+},2^{+}$ and $I=0,1$. A chromomagnetical mixing between the color configurations $\bar{3}_{c}\otimes 3_{c}$ and $6_{c}\otimes \bar{6}_{c}$ is noted for the bottom-charmed states $T_{bc}$ with $IJ^{P}=01^{+}$ and $IJ^{P}=1(0^{+},1^{+})$.
description: 16 pages, 1 figures, Created by RevTex 4
Absolute Ca II H & K and H-alpha flux measurements of low-mass stars: Extending $R'_\mathrm{HK}$ to M dwarfs
Creators: name: Marvin, C. J.
name: Reiners, A.
name: Anglada-Escudé, G.
name: Jeffers, S. V.
name: Saikia, S. Boro
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Context: With the recent surge of planetary surveys focusing on detecting Earth-mass planets around M dwarfs, it is becoming more important to understand chromospheric activity in M dwarfs. Stellar chromospheric calcium emission is typically measured using the $R'_\mathrm{HK}$ calibrations of Noyes et al. (1984), which are only valid for $0.44 \le B-V \le 0.82$. Measurements of calcium emission for cooler dwarfs $B-V \ge 0.82$ are difficult because of their intrinsic dimness in the blue end of the visible spectrum. Aims: We measure the absolute Ca II HK and H$α$ flux of a sample of 110 HARPS M dwarfs and also extend the calibration of $R'_\mathrm{HK}$ to the M dwarf regime using PHOENIX stellar atmosphere models. Methods: We normalized a template spectrum with a high signal-to-noise ratio that was obtained by coadding multiple spectra of the same star to a PHOENIX stellar atmosphere model to measure the chromospheric Ca II HK and H$α$ flux in physical units. We used three different $T_\mathrm{eff}$ calibrations and investigated their effect on Ca II HK and H$α$ activity measurements. We performed conversions of the Mount Wilson S index to $R'_\mathrm{HK}$ as a function of effective temperature for the range 2300 K $\le T_\mathrm{eff} \le$ 7200 K. Last, we calculated continuum luminosity $χ$ values for Ca II HK and H$α$ in the same manner as West & Hawley (2008) for $-1.0 \le \mathrm{Fe/H} \le +1.0$ in steps of $Δ\mathrm{Fe/H} = 0.5$. Results: We compare different $T_\mathrm{eff}$ calibrations and find $ΔT_\mathrm{eff} \sim$ several 100 K for mid- to late-M dwarfs. Using these different $T_\mathrm{eff}$ calibrations, we establish a catalog of $\log R'_\mathrm{HK}$ and $\mathcal{F}'_\mathrm{Hα}/\mathcal{F}_\mathrm{bol}$ measurements for 110 HARPS M dwarfs. [abridged]
description: 26 pages, 17 figures, accepted for publication in Astronomy & Astrophysics. Abstract abridged for arXiv submission
Framing of objectives for a specialist medical centre
Creators: name: Bolitho, George Samuel.
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Locally favoured structures and dynamic length scales in a simple glass-former
Creators: name: Royall, C. Patrick
name: Kob, Walter
Publisher: name: arXiv
Year: 2016
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We investigate the static and dynamic properties of a weakly polydisperse hard sphere system in the deeply supercooled state, i.e. at densities higher than that corresponding to the mode-coupling transition. The structural analysis reveals the emergence of icosahedral locally favoured structures, previously only found in trace quantities. We present a new approach to probe the shape of dynamically heterogeneous regions, which is insensitive to particle packing effects that can hamper such analysis. Our results indicate that the shape of the dynamically heterogeneous regions changes only weakly and moreover hint that the often-used four-point correlation length may exhibit a growth in excess of that which our method identifies. The growth of the size of the dynamically heterogeneous regions appears instead to be in line with the one of structural and dynamic propensity correlations.
description: under review at J. Stat Mech: Theory and Experiment
Orbital support and evolution of flat profiles of bars (shoulders)
Creators: name: Silva, Leandro Beraldo e
name: Debattista, Victor P.
name: Anderson, Stuart R.
name: Valluri, Monica
name: Erwin, Peter
name: Daniel, Kathryne J.
name: Deg, Nathan
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Many barred galaxies exhibit upturns (shoulders) in their bar major-axis density profile. Simulation studies have suggested that shoulders are supported by looped $x_1$ orbits, occur in growing bars, and can appear after bar-buckling. We investigate the orbital support and evolution of shoulders via frequency analyses of orbits in simulations. We confirm that looped orbits are shoulder-supporting, and can remain so, to a lesser extent, after being vertically thickened. We show that looped orbits appear at the resonance $(Ω_φ- Ω_\mathrm{P})/Ω_R=1/2$ (analogous to the classical Inner Lindblad Resonance, and here called ILR) with vertical-to-radial frequency ratios $1 \lesssimΩ_z/Ω_R \lesssim 3/2$ (vertically warm orbits). Cool orbits at the ILR (those with $Ω_z/Ω_R > 3/2$) are vertically thin and have no loops, contributing negligibly to shoulders. As bars slow and thicken, either secularly or by buckling, they populate warm orbits at the ILR. Further thickening carries these orbits towards crossing the vertical ILR [vILR, $(Ω_φ- Ω_\mathrm{P})/Ω_z=1/2$], where they convert in-plane to vertical motion, become chaotic, kinematically hotter and less shoulder-supporting. Hence, persistent shoulders require bars to trap new stars, consistent with the need for a growing bar. Since buckling speeds up trapping on warm orbits at the ILR, it can be followed by shoulder formation, as seen in simulations. This sequence supports the recent observational finding that shoulders likely precede the emergence of BP-bulges. The python module for the frequency analysis, naif, is made available.
description: Published in ApJ; A few additional figures in response to referee's request. Conclusions unchanged
Supplementary Materials
Creators: name: Sayed, Shimaa
Publisher: name: Zenodo
Year: 2020

description: Table S1, HPLC-MS method for analysis of plant extract; Figures S1-S7, HPLC-MS analysis of the following plant extracts C. Chinensis(V-22579-W-00 55), E. Ulmoides(V-22582-W-00 55), L. Lucidum (V-22580-W-00 55), A. Bidentata (V-22581-W-00 55), A. Membranaceus (V-22577-W-00 55), P. Cocos (V-22587-W-00 55), S. Chinensis(V-22584-W-00 55).
A multi-differential investigation of strangeness production in pp collisions with ALICE
Creators: name: Schotter, Romain
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: In these proceedings, two multi-differential analyses performed in pp collisions collected by the ALICE collaboration during the LHC Run 2 are presented. One investigates the dependence of strange particle production with multiplicity and effective energy, whereas the other clarifies how strangeness enhancement is correlated to the leading jet in the event. The results suggest that strangeness production at the LHC depends strongly on effective energy, and originates dominantly from the transverse region with respect to the leading jet direction.
description: 4 pages, references included, 3 figures. Proceedings for the 20th International Conference on Strangeness in Quark Matter (SQM 2022), 13-17 June 2022; submitted to EPJ Web of Conferences
Bound on genuine multipartite correlations from the principle of information causality
Creators: name: Xiang, Yang
name: Ren, Wei
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum mechanics is not the unique no-signaling theory which is endowed with stronger-than-classical correlations, and there exists a broad class of no-signaling theories allowing even stronger-than-quantum correlations. The principle of information causality has been suggested to distinguish quantum theory from these nonphysical theories, together with an elegant information-theoretic proof of the quantum bound of two-particle correlations. In this work, we extend this to genuine $N$-particle correlations that cannot be reduced to mixtures of states in which a smaller number of particles are entangled. We first express Svetlichny's inequality in terms of multipartite no-signaling boxes, then prove that the strongest genuine multipartite correlations lead to the maximal violation of information causality. The maximal genuine multipartite correlations under the constraint of information causality is found to be equal to the quantum mechanical bound. This result consolidates information causality as a physical principle defining the possible correlations allowed by nature, and provides intriguing insights into the limits of genuine multipartite correlations in quantum theory.
description: 5 pages, 3 figures, published version
Reproducibility of workflows and containers at OpenEBench
Creators: name: Garrayo, Javier
name: Codó, Laia
name: Vendrell, Esther
name: Sundesha, Vicky
name: Fernandez-Gonzalez, José María
name: Gelpi, Josep LI
name: Capella-Gutierrez, Salvador
Publisher: name: F1000 Research Limited
Year: 2020

description: Technical and scientific benchmarking of analysis procedures are becoming key aspects of modern science. As the amount available bioinformatic software keeps increasing, the necessity for open, unbiased and reproducible challenges which evaluate the scientific and computational performance of those resources becomes more evident. For such a purpose, platforms such as OpenEBench are being developed. OpenEBench is designed to establish an automated benchmarking system for bioinformatics tools, web servers and workflows. Gathered results help users to choose the most suitable software for the problem at hand, and they provide a reference to developers when they want to improve their methods.

One of the main issues in benchmarking nowadays is the low reusability of its workflows and components, mainly due to lack of standardization, ambiguity in tools and parameters, as well as problems in sharing and maintenance. Also, the proposed workflows are usually not well specified, making it complicated to understand the flow and utilization of data. Thus, we are addressing those limitations in our infrastructure by defining reproducible and interoperable benchmarking workflows in order to make those challenges available to the scientific community.

Our efforts are directed towards standardization and reusability of workflows including the creation of a benchmarking ontology. This can be achieved by standardizing the required steps any benchmark challenge needs and recommending the usage of workflow managers such as Nextflow for its implementation. We also encourage tools reusability by using software container technologies such as Docker or Singularity. Regarding the creation and use of a benchmarking ontology, this effort will allow to provide additional metadata to the data model used in OpenEBench. Such additional metadata will facilitate the data exchange across challenges within the same community and across communities as well as it will provide a formal description of datasets and workflows.

OpenEBench benchmarking workflows system has already been successfully used to run benchmarking experiments in very diverse areas such as on orthology and paralogy predictions e.g. Quest for Orthologs Consortium; and in the identification of cancer driver genes e.g. The Cancer Genome Atlas’ Benchmarking group. Moreover, those workflows are supporting ongoing efforts, like some of the DREAM challenges, or the ones by the Spanish Network of Biomedical Research Center on Rare Diseases (CIBERER).
Higher Auslander-Reiten sequences and $t$-structures
Creators: name: Uribe, Juan Camilo Arias
name: Backelin, Erik
Publisher: name: arXiv
Year: 2013
Subjects: subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 16G10, 16G70, 18G99

description: Let $R$ be an artin algebra and $\mathcal{C}$ an additive subcategory of $\operatorname{mod}(R)$. We construct a $t$-structure on the homotopy category $\operatorname{K}^{-}(\mathcal{C})$ whose heart $\mathcal{H}_{\mathcal{C}}$ is a natural domain for higher Auslander-Reiten (AR) theory. The abelian categories $\mathcal{H}_{\operatorname{mod}(R)}$ (which is the natural domain for classical AR theory) and $\mathcal{H}_{\mathcal{C}}$ interact via various functors. If $\mathcal{C}$ is functorially finite then $\mathcal{H}_{\mathcal{C}}$ is a quotient category of $\mathcal{H}_{\operatorname{mod}(R)}$. We illustrate the theory with two examples: Iyama developed a higher AR theory when $\mathcal{C}$ is a maximal $n$-orthogonal subcategory, see \cite{I}. In this case we show that the simple objects of $\mathcal{H}_{\mathcal{C}}$ correspond to Iyama's higher AR sequences and derive his higher AR duality from the existence of a Serre functor on the derived category $\operatorname{D}^b(\mathcal{H}_{\mathcal{C}})$. The category $\mathcal{O}$ of a complex semi-simple Lie algebra $\mathfrak{g}$ fits into higher AR theory by considering $R$ to be the coinvariant algebra of the Weyl group of $\mathfrak{g}$.
description: 26 pages, accepted for publication in Journal of Algebra 2016
Mycobacterium Tuberculosis and COVID-19 Co-infection in a Man with Pleural Empyema: A Call for Surveillance
Creators: name: MO, Onyeaghala AC, Chika-Igwenyi NM, Unigwe US,  Okorie J, Ude C, Chukwu K, Iroezindu
Publisher: name: figshare
Year: 2022
Subjects: Diseases

description: Background: Despite the ongoing coronavirus disease-2019 (COVID-19) pandemic threatening to reverse the gains made in tuberculosis (TB) prevention and control, especially in the Sub-Saharan Africa (SSA) where the disease burden is high, there are paucity of reports of TB and COVID-19 co-infection in SSA. We described an unusual clinical presentation of TB and COVID-19 co-infection in order to mitigate missed diagnosis and promote high index of suspicion during the pandemic. Methods: A case report of a Nigerian man managed at the Infectious Diseases/Tropical Medicine Unit of the University of Nigeria Teaching Hospital (UNTH) in May/June 2021. Results: A 50-year-old man who presented with productive cough and exertional breathlessness of 2 months duration, with associated unintentional weight loss, anorexia and low-grade fever. Relevant investigations showed anaemia, lymphocytosis and elevated erythrocyte sedimentation rate (ESR). Chest radiograph revealed left lung collapse with loculated pleural effusion. Sputum and pleural fluid GeneXpert detected tuberculous bacilli while nasopharyngeal/oropharyngeal (NP/OP) swab real time polymerase chain reaction (RT-PCR) was positive for SARS-CoV-2. He was diagnosed with tuberculous empyema with COVID-19 co-infection and was admitted in the isolation centre of UNTH under strict infection prevention and control (IPC) guidelines. He was placed on anti-TB medications, anticoagulants, short-term low-dose corticosteroids, supplemental oxygen and chest tube thoracostomy drainage. After 21 days of hospitalization, he improved remarkably with resolution of most of the symptoms. Repeat NP/OP swab RT-PCR as negative for SARS-CoV-2. He was continued on anti-TB medications and chest physiotherapy. Conclusions: This unusual case emphasizes the need for clinicians to maintain a high index of suspicion and stimulates a call for enhanced surveillance to promote early recognition and diagnosis of TB and COVID-19 co-infection in SSA.
Kramers-Kronig relation in gravitational lensing
Creators: name: Tanaka, So
name: Suyama, Teruaki
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The Kramers-Kronig relation is a well-known relation, especially in the field of optics. The key to this relation is the causality that output comes only after input. We first show that gravitational lensing obeys the causality in the sense that (electromagnetic/gravitational) waves emitted from the source arrive at an observer only after the arrival of the signal in geometrical optics. This is done by extending the previous work which is based on the thin lens approximation. We then derive the Kramers-Kronig relation in gravitational lensing, as the relation between real and imaginary parts of the amplification factor, which is the amplitude ratio of the lensed wave to the unlensed wave. As a byproduct, we find a new relation that equates integration of the square of the real part of the amplification factor over frequency to that for the imaginary part of the amplification factor. We also obtain a sum rule which relates the integral of the imaginary part of the amplification factor with the magnification of the first arrival image in geometrical optics. Finally, we argue that an incorrect separation of the observed gravitational waveform into the amplification factor and the unlensed waveform generically leads to the violation of the Kramers-Kronig relation. Our work suggests that examining the violation of the Kramers-Kronig relation may be used for correctly extracting the lensing signal in the gravitational wave observations.
description: 19 pages, 5 figures, published in PRD
Proceedings 9th Interaction and Concurrency Experience
Creators: name: Bartoletti, Massimo
name: Henrio, Ludovic
name: Knight, Sophia
name: Vieira, Hugo Torres
Publisher: name: arXiv
Year: 2016
Subjects: subject: Programming Languages (cs.PL)
subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences

description: This volume contains the proceedings of ICE 2016, the 9th Interaction and Concurrency Experience, which was held in Heraklion, Greece on the 8th and 9th of June 2016 as a satellite event of DisCoTec 2016. The ICE procedure for paper selection allows PC members to interact, anonymously, with authors. During the review phase, each submitted paper is published on a discussion forum whose access is restricted to the authors and to all the PC members not declaring a conflict of interest. The PC members post comments and questions that the authors reply to. For the first time, the 2016 edition of ICE included a feature targeting review transparency: reviews of accepted papers were made public on the workshop website and workshop participants in particular were able to access them during the workshop. Each paper was reviewed by three PC members, and altogether nine papers were accepted for publication (the workshop also featured three brief announcements which are not part of this volume). We were proud to host two invited talks, by Alexandra Silva and Uwe Nestmann. The abstracts of these two talks are included in this volume together with the regular papers.
Vermilion River Aquatic Ecosystem Assessment
Creators: North Saskatchewan Watershed Alliance (NSWA)
Publisher: name: University of Alberta Library
Year: 2016

The Vermilion River is a small, slow-moving mud-bottom prairie river in Alberta. Except for the lowest reach, the river ceases to flow in mid to late summer, which dictates many ecosystem processes. This study reports poor macroinvertebrate FBI score, which shows the Vermilion River to be an unhealthy system, which is consistent with the widespread degradation of riparian areas and wetlands. Aquatic ecosystem health is much improved near the mouth of the Vermilion River due to the presence of physical habitat diversity, improved hydraulic connectivity with the regional fish species pool (i.e., the North Saskatchewan River), and improved water quality. (As cited on https://www.nswa.ab.ca/)
Asymptotic expansion of a partition function related to the sinh-model
Creators: name: Borot, G.
name: Guionnet, A.
name: Kozlowski, K. K.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mathematical Physics (math-ph)
subject: Probability (math.PR)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: This paper develops a method to carry out the large-$N$ asymptotic analysis of a class of $N$-dimensional integrals arising in the context of the so-called quantum separation of variables method. We push further ideas developed in the context of random matrices of size $N$, but in the present problem, two scales $1/N^α$ and $1/N$ naturally occur. In our case, the equilibrium measure is $N^α$-dependent and characterised by means of the solution to a $2\times 2$ Riemann--Hilbert problem, whose large-$N$ behavior is analysed in detail. Combining these results with techniques of concentration of measures and an asymptotic analysis of the Schwinger-Dyson equations at the distributional level, we obtain the large-$N$ behavior of the free energy explicitly up to $o(1)$. The use of distributional Schwinger-Dyson is a novelty that allows us treating sufficiently differentiable interactions and the mixing of scales $1/N^α$ and $1/N$, thus waiving the analyticity assumptions often used in random matrix theory.
description: 158 pages, 4 figures (V2 introduction extended, missprints corrected, clarifications added to lemma 3.1.9 and corollary 3.1.10)
Health insurance for the chronically ill : an examination of high risk health insurance in Australia with particular reference to the Special Accounts legislation 1959-1975
Creators: name: Jackson, Trevor V.
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Africa in the Globalizing World
Creators: name: Middell, Matthias
name: Engel, Ulf
name: Simo, David
name: Werthmann, Katja
Publisher: name: Leipziger Universitätsverlag
Year: 2017

description: Dieser Überblick zum historischen Forschungsstand beschreibt die Dynamiken der Flüchtlingspolitik während der Krise, die die Verfolgungen und Vertreibungen in Nazi-Deutschland auslöste. Die Historiographie zu diesem Gegenstand ist noch immer stark von nationalen Perspektiven geprägt, wobei jedes Land seine eigenen Narrative und Analysen produziert. Eine vergleichende Studie durch Experten nationaler Fälle hat die Ähnlichkeiten und Unterschiede in den Politiken verschiedener Staaten herausgearbeitet und gleichzeitig gezeigt, dass diese sich in starkem Maße an den Entscheidungen ihrer Nachbarn ausgerichtet haben. Der Artikel liefert eine Synthese dieser Untersuchung, integriert neue Forschungsresultate und bewertet die Verdienste des internationalen Flüchtlingsregimes dieser Zeit neu, das bislang nur ungenügende Aufmerksamkeit in der historischen Forschung gefunden hat.
description: Comparativ, Vol 27 No 1 (2017): Modern Refugees as Challengers of Nation-State Sovereignty: From the Historical to the Contemporary
Topologies of $^{76}$Ge double-beta decay events and calibration procedure biases
Creators: name: Comellato, Tommaso
name: Agostini, Matteo
name: Schönert, Stefan
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: The analysis of the time profile of electrical signals produced by energy depositions in germanium detectors allows discrimination of events with different topologies. This is especially relevant for experiments searching for the neutrinoless double beta decay of $^{76}$Ge to distinguish the sought-after signal from other background sources. The standard calibration procedures used to tune the selection criteria for double-beta decay events use a $^{228}$Th source, because it provides samples of signal-like events. These samples exhibit energy spatial distributions with subtle different topologies compared to neutrinoless double-beta decay events. In this work, we will characterize these topological differences and, with the support of a $^{56}$Co source, evaluate biases and precision of calibration techniques which use such event samples. Our results will be particularly relevant for future experiments in which a solid estimation of the efficiency is required.
The Origin of Double-peaked Narrow Lines in Active Galactic Nuclei II: Kinematic Classifications for the Population at z < 0.1
Creators: name: Nevin, Rebecca
name: Comerford, Julia
name: Müller-Sánchez, Francisco
name: Barrows, R. Scott
name: Cooper, Michael
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present optical longslit observations of the complete sample of 71 Type 2 active galactic nuclei (AGNs) with double-peaked narrow emission lines at $z < 0.1$ in the Sloan Digital Sky Survey. Double-peaked emission lines are produced by a variety of mechanisms including disk rotation, kpc-scale dual AGNs, and NLR kinematics (outflows or inflows). We develop a novel kinematic classification technique to determine the nature of these objects using longslit spectroscopy alone. We determine that 86% of the double-peaked profiles are produced by moderate luminosity AGN outflows, 6% are produced by rotation, and 8% are ambiguous. While we are unable to directly identify dual AGNs with longslit data alone, we explore their potential kinematic classifications with this method. We also find a positive correlation between the narrow-line region (NLR) size and luminosity of the AGN NLRs (R$_{\mathrm{NLR}}\propto \; {\mathrm{L}_{\mathrm{[OIII]}}}^{0.21 \pm 0.05}$), indicating a clumpy two-zone ionization model for the NLR.
description: 27 pages, 17 figures, 6 tables, accepted for publication in ApJ; See Figures 8, 9, and 17 for a summary of the findings
Modular functors, cohomological field theories and topological recursion
Creators: name: Andersen, Jørgen Ellegaard
name: Borot, Gaëtan
name: Orantin, Nicolas
Publisher: name: arXiv
Year: 2015
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Algebraic Geometry (math.AG)
subject: Quantum Algebra (math.QA)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 81T40, 81T45

description: Given a topological modular functor $\mathcal{V}$ in the sense of Walker \cite{Walker}, we construct vector bundles over $\bar{\mathcal{M}}_{g,n}$, whose Chern classes define semi-simple cohomological field theories. This construction depends on a determination of the logarithm of the eigenvalues of the Dehn twist and central element actions. We show that the intersection of the Chern class with the $ψ$-classes in $\bar{\mathcal{M}}_{g,n}$ is computed by the topological recursion of \cite{EOFg}, for a local spectral curve that we describe. In particular, we show how the Verlinde formula for the dimensions $D_{\vecλ}(\mathbfΣ_{g,n}) = \dim \mathcal{V}_{\vecλ}(\mathbfΣ_{g,n})$ is retrieved from the topological recursion. We analyze the consequences of our result on two examples: modular functors associated to a finite group $G$ (for which $D_{\vecλ}(\mathbfΣ_{g,n})$ enumerates certain $G$-principle bundles over a genus $g$ surface with $n$ boundary conditions specified by $\vecλ$), and the modular functor obtained from Wess-Zumino-Witten conformal field theory associated to a simple, simply-connected Lie group $G$ (for which $\mathcal{V}_{\vecλ}(\mathbfΣ_{g,n})$ is the Verlinde bundle).
description: 50 pages, 2 figures. v2: typos corrected and clarification about the use of ordered pairs of points for glueing. v3: unitarity assumption waived + discussion of families index interpretation of the correlation functions for Wess-Zumino-Witten theories
Non-intrusive Hybrid Scheme for Multiscale Heat Transfer: Thermal Runaway in a Battery Pack
Creators: name: Yao, Yinuo Noah
name: Harabin, Perry
name: Behandish, Morad
name: Battiato, Ilenia
Publisher: name: arXiv
Year: 2023
Subjects: subject: Numerical Analysis (math.NA)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: Accurate analytical and numerical modeling of multiscale systems is a daunting task. The need to properly resolve spatial and temporal scales spanning multiple orders of magnitude pushes the limits of both our theoretical models as well as our computational capabilities. Rigorous upscaling techniques enable efficient computation while bounding/tracking errors and helping to make informed cost-accuracy tradeoffs. The biggest challenges arise when the applicability conditions of upscaled models break down. Here, we present a non-intrusive two-way (iterative bottom-up top-down) coupled hybrid model, applied to thermal runaway in battery packs, that combines fine-scale and upscaled equations in the same numerical simulation to achieve predictive accuracy while limiting computational costs. First, we develop two methods with different orders of accuracy to enforce continuity at the coupling boundary. Then, we derive weak (i.e., variational) formulations of the fine-scale and upscaled governing equations for finite element (FE) discretization and numerical implementation in FEniCS. We demonstrate that hybrid simulations can accurately predict the average temperature fields within error bounds determined a priori by homogenization theory. Finally, we demonstrate the computational efficiency of the hybrid algorithm against fine-scale simulations.
description: 53 pages, 36 figures
Towards correcting atmospheric beam wander via pump beam control in a down conversion process
Creators: name: Pugh, Christopher J.
name: Kolenderski, Piotr
name: Scarcella, Carmelo
name: Tosi, Alberto
name: Jennewein, Thomas
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Correlated photon pairs produced by a spontaneous parametric down conversion (SPDC) process can be used for secure quantum communication over long distances including free space transmission over a link through turbulent atmosphere. We experimentally investigate the possibility to utilize the intrinsic strong correlation between the pump and output photon spatial modes to mitigate the negative targeting effects of atmospheric beam wander. Our approach is based on a demonstration observing the deflection of the beam on a spatially resolved array of single photon avalanche diodes (SPAD-array).
A Gradual Relinquishment of National Sovereignty? A Comparative Analysis of Europe’s Response to Boat Migrants in Search of Asylum
Creators: name: Glynn, Irial
Publisher: name: Leipziger Universitätsverlag
Year: 2017

description: Dieser Überblick zum historischen Forschungsstand beschreibt die Dynamiken der Flüchtlingspolitik während der Krise, die die Verfolgungen und Vertreibungen in Nazi-Deutschland auslöste. Die Historiographie zu diesem Gegenstand ist noch immer stark von nationalen Perspektiven geprägt, wobei jedes Land seine eigenen Narrative und Analysen produziert. Eine vergleichende Studie durch Experten nationaler Fälle hat die Ähnlichkeiten und Unterschiede in den Politiken verschiedener Staaten herausgearbeitet und gleichzeitig gezeigt, dass diese sich in starkem Maße an den Entscheidungen ihrer Nachbarn ausgerichtet haben. Der Artikel liefert eine Synthese dieser Untersuchung, integriert neue Forschungsresultate und bewertet die Verdienste des internationalen Flüchtlingsregimes dieser Zeit neu, das bislang nur ungenügende Aufmerksamkeit in der historischen Forschung gefunden hat.
description: Comparativ, Vol 27 No 1 (2017): Modern Refugees as Challengers of Nation-State Sovereignty: From the Historical to the Contemporary
Valence fuctuation and magnetic ordering in EuNi2(P1-xGex)2 single crystals
Creators: name: Paramanik, U. B.
name: Bar, A.
name: Das, Debarchan
name: Caroca-Canales, N.
name: Prasad, R.
name: Geibel, C.
name: Hossain, Z.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Unusual phases and phase transitions are seen at the magnetic-nonmagnetic boundary in Ce, Eu and Yb-based compounds. EuNi$_2$P$_{2}$ is a very unusual valence fluctuating Eu system, because at low temperatures the Eu valence stays close to 2.5 instead of approaching an integer value. Eu valence and thus the magnetic property in this system can be tuned by Ge substitution in P site as EuNi$_2$Ge$_{2}$ is known to exhibit antiferromagnetc (AFM) ordering of divalent Eu moments with $T_N$ = 30 K. We have grown EuNi$_2$(P$_{1-x}$Ge$_x$)$_2$ (0.0 $\leq$ $x$ $\leq$ 0.5) single crystals and studied their magnetic, thermodynamic and transport properties. Increasing Ge doping to $x >$ 0.4 results in a well-defined AFM ordered state with $T_N$ = 12 K for $x$ = 0.5. Moreover, the reduced value of magnetic entropy for $x$ = 0.5 at $T_N$ suggests the presence of valance fluctuation/ Kondo effect in this compound. Interestingly, the specific heat exhibits an enhanced Sommerfeld coefficient upon Ge doping. Subsequently, electronic structure calculations lead to a non-integral valence in EuNi$_2$P$_{2}$ but a stable divalent Eu state in EuNi$_2$Ge$_{2}$ which is in good agreement with experimental results.
description: 7 pages, 8 figures
Chern-Simons theory on spherical Seifert manifolds, topological strings and integrable systems
Creators: name: Borot, Gaetan
name: Brini, Andrea
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Algebraic Geometry (math.AG)
subject: Geometric Topology (math.GT)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We consider the Gopakumar-Ooguri-Vafa correspondence, relating ${\rm U}(N)$ Chern-Simons theory at large $N$ to topological strings, in the context of spherical Seifert 3-manifolds. These are quotients $\mathbb{S}^Γ = Γ\backslash\mathbb{S}^3$ of the three-sphere by the free action of a finite isometry group. Guided by string theory dualities, we propose a large $N$ dual description in terms of both A- and B-twisted topological strings on (in general non-toric) local Calabi-Yau threefolds. The target space of the B-model theory is obtained from the spectral curve of Toda-type integrable systems constructed on the double Bruhat cells of the simply-laced group identified by the ADE label of $Γ$. Its mirror A-model theory is realized as the local Gromov-Witten theory of suitable ALE fibrations on $\mathbb{P}^1$, generalizing the results known for lens spaces. We propose an explicit construction of the family of target manifolds relevant for the correspondence, which we verify through a large $N$ analysis of the matrix model that expresses the contribution of the trivial flat connection to the Chern-Simons partition function. Mathematically, our results put forward an identification between the $1/N$ expansion of the $\mathrm{sl}_{N + 1}$ LMO invariant of $\mathbb{S}^Γ$ and a suitably restricted Gromov-Witten/Donaldson-Thomas partition function on the A-model dual Calabi-Yau. This $1/N$ expansion, as well as that of suitable generating series of perturbative quantum invariants of fiber knots in $\mathbb{S}^Γ$, is computed by the Eynard-Orantin topological recursion.
description: 65 pages
Gauged $U(1)_{L_μ- L_τ}$ model in light of muon $g-2$ anomaly, neutrino mass and dark matter phenomenology
Creators: name: Patra, Sudhanwa
name: Rao, Soumya
name: Sahoo, Nirakar
name: Sahu, Narendra
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Gauged $U(1)_{L_μ- L_τ}$ model has been advocated for a long time in light of muon $g-2$ anomaly, which is a more than $3σ$ discrepancy between the experimental measurement and the standard model prediction. We augment this model with three right-handed neutrinos $(N_e, N_μ, N_τ)$ and a vector-like singlet fermion $(χ)$ to explain simultaneously the non-zero neutrino mass and dark matter content of the Universe, while satisfying anomalous muon $g-2$ constraints. It is shown that in a large parameter space of this model we can explain positron excess, observed at PAMELA, Fermi-LAT and AMS-02, through dark matter annihilation, while satisfying the relic density and direct detection constraints.