cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Low-energy quantum gravity leads to another picture of the universe
Creators: name: Ivanov, Michael A.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: If gravitons are super-strong interacting particles and the low-temperature graviton background exists, the basic cosmological conjecture about the Dopplerian nature of redshifts may be false: a full magnitude of cosmological redshift would be caused by interactions of photons with gravitons. Non-forehead collisions with gravitons will lead to a very specific additional relaxation of any photonic flux that gives a possibility of another interpretation of supernovae 1a data - without any kinematics. These facts may implicate a necessity to change the standard cosmological paradigm. Some features of a new paradigm are discussed. In a frame of this model, every observer has two different cosmological horizons. One of them is defined by maximum existing temperatures of remote sources - by big enough distances, all of them will be masked with the CMB radiation. Another, and much smaller, one depends on their maximum luminosity - the luminosity distance increases with a redshift much quickly than the geometrical one. If the considered quantum mechanism of classical gravity is realized in the nature, then an existence of black holes contradicts to the equivalence principle. In this approach, the two fundamental constants - Hubble's and Newton's ones - should be connected between themselves. The theoretical value of the Hubble constant is computed. Also, every massive body would be decelerated due to collisions with gravitons that may be connected with the Pioneer 10 anomaly.
description: 13 pages, 4 figures, LaTeX. Contribution to the 1st Crisis in Cosmology Conference (CCC-1), Moncao, Portugal, 23-25 June 2005. A small correction is made in this version at the very beginning of subsection 4.3
Lattice relaxation, mirror symmetry and magnetic field effects on ultraflat bands in twisted trilayer graphene
Creators: name: Wu, Zewen
name: Zhan, Zhen
name: Yuan, Shengjun
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: Twisted graphene multilayers exhibit strongly correlated insulating states and superconductivity due to the presence of ultraflat bands near the charge neutral point. In this paper, the response of ultraflat bands to lattice relaxation and a magnetic field in twisted trilayer graphene (tTLG) with different stacking arrangements is investigated by using a full tight-binding model. We show that lattice relaxations are indispensable for understanding the electronic properties of tTLG, in particular, of tTLG in the presence of mirror symmetry. Lattice relaxations renormalize the quasiparticle spectrum near the Fermi energy and change the localization of higher energy flat bands. Furthermore, different from the twisted bilayer graphene, the Hofstadter butterfly spectrum can be realized at laboratory accessible strengths of magnetic field. Our work verifies tTLG as a more tunable platform than the twisted bilayer graphene in strongly correlated phenomena.
description: 7 pages,5 figures
Gravitational orbital Hall effect of vortex light in Lense-Thirring metric
Creators: name: Qiu, Wei-Si
name: Lian, Dan-Dan
name: Zhang, Peng-Ming
Publisher: name: arXiv
Year: 2024
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Vortex light, characterized by an intrinsic orbital angular momentum aligned with its propagation direction, is described through vortex electromagnetic waves. Similar to the gravitational spin Hall effect (SHE), vortex light is expected to exhibit intrinsic orbital angular momentum dependent trajectories and deviations from the null geodesic plane when propagating through a gravitational field, a phenomenon termed the gravitational orbital Hall effect (OHE). In this work, we model the vortex light as vortex Laguerre-Gaussian electromagnetic wave packets and analyze its motion by solving covariant Maxwell equations within the Lense-Thirring metric. Our findings reveal that the trajectory of vortex light with an intrinsic orbital angular momentum deviates from the null geodesic in two ways. It deviates both perpendicular to, and within, the null geodesic plane. This behavior contrasts with the gravitational SHE, where spin-polarized light primarily deviates perpendicular to the null geodesic plane. Moreover, the relationship between the deviation and intrinsic orbital angular momentum differs significantly from that between the deviation and spin. These results suggest a unique interaction between intrinsic orbital angular momentum and gravity, distinct from the spin-gravity coupling, indicating that the gravitational OHE of light might not be precisely predicted by merely substituting spin with intrinsic orbital angular momentum in the gravitational SHE of light.
Analyzing business models in products, platforms, or ecosystems
Creators: name: Hakanen, Esko
Publisher: name: Journal of Business Models
Year: 2021

description: Purpose: This conceptual article argues that the definition of a business model should be different for products, platforms, and ecosystems. Design/Methodology/Approach: Building on existing literature, this article suggests a clarification on the business model construct. We summarize the dispersed literature on defining the concept and proposes a converging approach to suit three different contexts. Research Limitations/Implications: The paper presents illustrative examples for different contextual approaches. However, we are restricted to simplifications when both summarizing the existing literature and presenting the empirical examples. Practical Implications: The presented model can increase the clarity and applicability of the business model concept for both scholars and practitioners. Originality/Value: We offer a new converging perspective to business model research, clarifying the benefits and applicability of the competing definitions. We argue that the different approaches help to delineate the typical characteristics of a business model, depending on the context of evaluation.
description: Journal of Business Models, Vol. 9 No. 4 (2021): Vol 9, No 4. Journal of Business Models
A NOTE ON THE COMPARATIVE COST OF LIVING IN SYDNEY AND COUNTRY TOWNS IN NEW SOUTH WALES
Creators: name: Davidson, Bruce Robinson
name: Tierman, M.F.
name: Davidson, Bruce Robinson
name: Tierman, M.F.
Publisher: name: Unknown
Year: 1975
Subjects: Community/Rural/Urban Development

description: A comparison between the cost of living of average wage earners in Sydney and nineteen country towns in New South Wales was carried out in 1974, assuming that expenditure on items of goods and services was distributed in the same proportion as in the Consumer Price Index in both country towns and the city. Housing, which was cheaper in the country, was the only group of major consumer expenditure where a significant difference between city and country town costs could be detected. The differences between the costs of food, clothing, services and miscellaneous items of expenditure in the city and country towns were not significant. A study using regression analysis revealed that there was a significant positive correlation between the size of country towns and the cost of services and housing. There were no significant relationships between town size and the costs of food, clothing or miscellaneous items of expenditure. Nor was a significant relationship found between the distance of country towns from Sydney and the cost of any major consumer expenditure group.
Climate control: Evidence from Nature
Creators: name: Aliev, Almaz
Publisher: name: figshare
Year: 2021
Subjects: subject: 40104 Climate Change Processes
subject: FOS: Earth and related environmental sciences
subject: Climate Science
subject: 40105 Climatology (excl. Climate Change Processes)
subject: 50303 Soil Biology
subject: FOS: Agriculture, forestry and fisheries
subject: 50304 Soil Chemistry (excl. Carbon Sequestration Science)
subject: 50305 Soil Physics
subject: Soil Science
subject: 50211 Wildlife and Habitat Management

description: Controlling the weather is a dream of humanity. Weather is a complex system. However, Nature seems to know how to control the climate at least at a local level. Historic and modern records show correlations in drought, rainfall and cold seasons with the movement events of large animals over large areas.
Stabilizer Formalism for Operator Quantum Error Correction
Creators: name: Poulin, David
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Operator quantum error correction is a recently developed theory that provides a generalized framework for active error correction and passive error avoiding schemes. In this paper, we describe these codes in the stabilizer formalism of standard quantum error correction theory. This is achieved by adding a "gauge" group to the standard stabilizer definition of a code that defines an equivalence class between encoded states. Gauge transformations leave the encoded information unchanged; their effect is absorbed by virtual gauge qubits that do not carry useful information. We illustrate the construction by identifying a gauge symmetry in Shor's 9-qubit code that allows us to remove 4 of its 8 stabilizer generators, leading to a simpler decoding procedure and a wider class of logical operations without affecting its essential properties. This opens the path to possible improvements of the error threshold of fault-tolerant quantum computing.
description: Corrected claim based on exhaustive search
Business models beyond Covid-19. A paradoxes approach
Creators: name: Bagnoli, Carlo
name: Dal Mas, Francesca
name: Biancuzzi, Helena
name: Massaro, Maurizio
Publisher: name: Journal of Business Models
Year: 2021

description: The Covid-19 crisis has undermined and disrupted several business fields. Organizations are called to address the new challenges by rethinking their business models. Employing an EFTE approach, the paper highlights 50 paradoxes to be taken into consideration in the strategic transformation process.
description: Journal of Business Models, Vol. 9 No. 4 (2021): Vol 9, No 4. Journal of Business Models
Iniciativas científicas e culturais no âmbito da história religiosa (2022)
Creators: name: Fontes, Paulo F. De Oliveira
name: Costa, Isabel Teixeira
Publisher: name: Lusitania Sacra
Year: 2023

description: Lusitania Sacra, n. 48 (2023): Relações entre o Papado e a Península Ibérica (séculos XI-XIII)
Valley-polarization in biased bilayer graphene using circularly polarized light
Creators: name: Friedlan, Alex
name: Dignam, Marc M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Achieving a population imbalance between the two inequivalent valleys is a critical first step for any valleytronic device. A valley-polarization can be induced in biased bilayer graphene using circularly polarized light. In this paper, we present a detailed theoretical study of valley-polarization in biased bilayer graphene. We show that a nearly perfect valley-polarization can be achieved with the proper choices of external bias and pulse frequency. We find that the optimal pulse frequency $ω$ is given by $\hbarω=2a,$ where $2a$ is the potential energy difference between the graphene layers. We also find that the valley-polarization originates not from the Dirac points themselves, but rather from a ring of states surrounding each. Intervalley scattering is found to greatly reduce the valley-polarization for high frequency pulses. Thermal populations are found to significantly reduce the valley-polarization for small biases. This work provides insight into the origin of valley-polarization in bilayer graphene and will aid experimentalists seeking to study valley-polarization in the lab.
description: 18 pages, 9 figures, v2: elaboration and readability improvements
From hidden metal-insulator transition to Planckian-like dissipation by tuning disorder in a nickelate
Creators: name: Guo, Qikai
name: Noheda, Beatriz
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Heavily oxygen deficient NdNiO$_3$ (NNO) films, which are insulating due to electron localization, contain pristine regions that undergo a hidden metal-insulator transition. Increasing oxygen content increases the connectivity of the metallic regions and the metal-insulator transition is first revealed, upon reaching the percolation threshold, by the presence of hysteresis. Only upon further oxygenation is the global metallic state (with a change in the resistivity slope) eventually achieved. It is shown that sufficient oxygenation leads to linear temperature dependence of resistivity in the metallic state, with a scattering rate directly proportional to temperature. Despite the known difficulties to establish the proportionality constant, the experiments are consistent with a relationship 1/$τ$= $αk_B T/\hbar$, with $α$ not far from unity. These results could provide experimental support for recent theoretical predictions of disorder in a two-fluid model as a possible origin of Planckian dissipation.
description: 14 pages, 11 figures
Boundary work for collaborative sustainable business model innovation: the journey of a Dutch SME
Creators: name: Velter, Myrthe
name: Bitzer, Verena
name: Bocken, Nancy
name: Kemp, René
Publisher: name: Journal of Business Models
Year: 2021

description: Purpose - How does a small business engage in boundary work to innovate its business model towards sustainability? We employ a boundary work lens to trace the endeavors of a small company to explore, negotiate and (re)align organizational boundaries in its multi-stakeholder network around new, sustainable value propositions. Design/methodology/approach - We engaged in longitudinal research of a company’s endeavors for multi-stakeholder alignment in sustainable business model innovation (SBMI). By means of thick description, this paper offers rich empirical insights on the processes of interaction between a small company and its stakeholders in the Dutch pork sector, with special attention to boundary spanners, boundary objects and the mutual organizational boundary changes. Findings - We find that the shaping and shifting of organizational boundaries highly influences the process and content of the business model innovation. During the phases of boundary exploration, brokering and boundary changes, there is a pivotal role for boundary objects to deal with uncertainties, to facilitate strategic discussions and to find solutions to different valuation frames, power tensions and role divisions between stakeholders. Research implications - SBMI can benefit from boundary work, as it helps companies to find value opportunities in the organizational boundaries of their external stakeholders, addressing challenges that emerge from existing organizational boundaries, and establishing boundary arrangements to facilitate this process. Originality/value - Boundary work interlinks concepts of identity, power, competences and efficiency in entrepreneurial processes of collaborative SBMI. The framework and methods of this study further our understanding of the co-evolutionary processes of SBMI.
description: Journal of Business Models, Vol. 9 No. 4 (2021): Vol 9, No 4. Journal of Business Models
AAT Imaging and Microslit Spectroscopy in the Southern Hubble Deep Field
Creators: name: Glazebrook, Karl
name: Verma, Aprajita
name: Boyle, Brian
name: Oliver, Sebastian
name: Mann, Robert G.
name: Monbleau, Davienne
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a deep photometric (B- and R-band) catalog and an associated spectroscopic redshift survey conducted in the vicinity of the Hubble Deep Field South. The spectroscopy yields 53 extragalactic redshifts in the range 0
description: From the better late than never department: AJ in press (2006). 16 pages, 2 tables, 6 figures, final data release + Appendix at http://www.aao.gov.au/hdfs/Redshifts/
Investigating the interplay between the coronal properties and the hard X-ray variability of active galactic nuclei with NuSTAR
Creators: name: Serafinelli, Roberto
name: De Rosa, Alessandra
name: Tortosa, Alessia
name: Stella, Luigi
name: Vagnetti, Fausto
name: Bianchi, Stefano
name: Ricci, Claudio
name: Kammoun, Elias
name: Petrucci, Pierre-Olivier
name: Middei, Riccardo
name: Lanzuisi, Giorgio
name: Marinucci, Andrea
name: Ursini, Francesco
name: Matt, Giorgio
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Active galactic nuclei (AGN) are extremely variable in the X-ray band down to very short timescales. However, the driver behind the X-ray variability is still poorly understood. Previous results suggest that the hot corona responsible for the primary Comptonized emission observed in AGN is expected to play an important role in driving the X-ray variability. In this work, we investigate the connection between the X-ray amplitude variability and the coronal physical parameters; namely, the temperature ($kT$) and optical depth ($τ$). We present the spectral and timing analysis of 46 {\it NuSTAR} observations corresponding to a sample of 20 AGN. For each source, we derived the coronal temperature and optical depth through X-ray spectroscopy and computed the normalized excess variance for different energy bands on a timescale of $10$ ks. We find a strong inverse correlation between $kT$ and $τ$, with correlation coefficient of $r<-0.9$ and negligible null probability. No clear dependence was found among the temperature and physical properties, such as the black hole mass or the Eddington ratio. We also see that the observed X-ray variability is not correlated with either the coronal temperature or optical depth under the thermal equilibrium assumption, whereas it is anticorrelated with the black hole mass. These results can be interpreted through a scenario where the observed X-ray variability could primarily be driven by variations in the coronal physical properties on a timescale of less than $10$~ks; whereas we assume thermal equilibrium on such timescales in this work, given the capability of the currently available hard X-ray telescopes. Alternatively, it is also possible that the X-ray variability is mostly driven by the absolute size of the corona, which depends on the supermassive black hole mass, rather than resulting from any of its physical properties.
description: Accepted for publication in Astronomy & Astrophysics, 21 pages, 9 figures, 4 tables
The early years of the Canadian League of Composers
Creators: name: Wolters, Benita
Publisher: name: University of British Columbia
Year: 2009

description: The Canadian League of Composers was founded in 1951 by young modernist composers who were frustrated with the musical conservatism of Canadian musical life. While it was its original intention to be inclusive of all styles of music, the League initially showed a bias towards modernist styles in both its membership policies and concert programming. Nonetheless, the all-Canadian concerts which the CLC sponsored exhibit a wide variety of musical idioms, offering us a rare glimpse into the wealth of compositional talent found in Canada at the time. These concerts also acted as an important historical precedent for the programming of Canadian works, and can be connected to the upsurge of newmusic groups in the 1960s and 70s. Other influential activities include planning for the Canadian Music Centre and hosting an International Conference of Composers. With these various successes achieved, the focus of the League's activities shifted in the 1960s from concert-giving to lobbying-an activity by which they continue to this day to promote Canadian music in its own country.
Empirical mass-loss rates and clumping properties of O-type stars in the LMC
Creators: name: Hawcroft, C.
name: Mahy, L.
name: Sana, H.
name: Sundqvist, J. O.
name: Abdul-Masih, M.
name: Brands, S. A.
name: Decin, L.
name: deKoter, A.
name: Puls, J.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We constrain wind parameters of a sample of 18 O-type stars in the LMC, through analysis with stellar atmosphere and wind models including the effects of optically thick clumping. This allows us to determine the most accurate spectroscopic mass-loss and wind structure properties of massive stars at sub-solar metallicity to date and gain insight into the impact of metallicity on massive stellar winds. Combining high signal to noise (S/N) ratio spectroscopy in the UV and optical gives us access to diagnostics of multiple different physical processes in the stellar wind. We produce synthetic spectra using the stellar atmosphere modelling code FASTWIND, and reproduce the observed spectra using a genetic algorithm based fitting technique. We empirically constrain 15 physical parameters associated with the stellar and wind properties, including temperature, surface gravity, surface abundances, rotation, macroturbulence and wind parameters. We find, on average, mass-loss rates a factor of 4-5 lower than those predicted by Vink et al. 2001, in good agreement with predictions from Bjorklund et al. 2021, and the best agreement with those from Krticka et al. 2018. In the 'weak-wind' regime we find mass-loss rates orders of magnitude below any theoretical predictions. We find a positive correlation of clumping factors (fcl) with effective temperature with an average fcl = 14 +- 8 for the full sample. Above 38 kK an average 46 +- 24% of the wind velocity span is covered by clumps and the interclump density is 10-30% of the mean wind. Below an effective temperature of roughly 38 kK there must be additional light leakage for supergiants. For dwarf stars at low temperatures there is a statistical preference for very low clump velocity spans, however it is unclear if this can be physically motivated as there are no clearly observable wind signatures in UV diagnostics.
description: 12 pages with 6 figures, plus 16 pages and 18 figures in appendix. Accepted for publication in A&A
Secrecy Performance of Terahertz Wireless Links in Rain and Snow
Creators: name: Wang, Rong
name: Mei, Yu
name: Meng, Xiangzhu
name: Ma, Jianjun
Publisher: name: arXiv
Year: 2020
Subjects: subject: Applied Physics (physics.app-ph)
subject: Signal Processing (eess.SP)
subject: FOS: Physical sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Wireless communication technique at terahertz (THz) frequencies is regarded as the most potential candidate for future wireless networks due to its wider frequency bandwidth and higher data capacity when compared to that employing radio frequency (RF) and millimeter wave (mmWave). Besides, a THz link can achieve higher security at physical layer when it propagates in clear weather due to its higher directionality, which reduces the possibility of eavesdropping attacks. However, under adverse weather conditions (such as water fog, dust fog, rain and snow), the link degradation due to weather particles and gaseous molecules will affect the link secrecy performance seriously. In this work, we present theoretical investigations on physical layer security of a point-to-point THz link in rain and snow with a potential eavesdropper locating outside of the legitimate link path. Signal degradation due to rain/snow, gaseous attenuation and beam divergence are included in a theoretical model to estimate the link performance. Secrecy capacity of the link with carriers at 140, 220 and 340 GHz is calculated and compared. Insecure regions are also presented and the secrecy performance is analyzed. We find that the THz link suffers least eavesdropping attacks in rain and the maximum data transmission rate decreases for higher carrier frequencies in rain and snow.
description: arXiv admin note: text overlap with arXiv:2009.00894
Business Model Matrix: Kit for the Design of Business Models
Creators: name: Bartels, Nedo
Publisher: name: Journal of Business Models
Year: 2021

description: How is it possible to systematically develop business model innovations for different domains? This paper provides a novel answer, using a methodological approach called Business Model Matrix (BMM), which merges the approaches of Business Model Canvas (BMC), Business Model Navigator (BMN), and Morphological Box.
description: Journal of Business Models, Vol. 9 No. 4 (2021): Vol 9, No 4. Journal of Business Models
Ultimate gravitational mass defect
Creators: name: Zaslavskii, O. B.
Publisher: name: arXiv
Year: 2005
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present a new type of gravitational mass defect in which an infinite amount of matter may be bounded in a zero ADM mass. This interpolates between effects typical of closed worlds and T-spheres. We consider the Tolman model of dust distribution and show that this phenomenon reveals itself for a solution that has no origin on one side but is closed on the other side. The second class of examples corresponds to smooth gluing T-spheres to the portion of the Friedmann-Robertson-Walker solution. The procedure is generalized to combinations of smoothly connected T-spheres, FRW and Schwarzschild metrics. In particular, in this approach a finite T-sphere is obtained that looks for observers in two R-regions as the Schwarzschild metric with two different masses one of which may vanish.
description: 9 pages. 1 reference added. To appear in Gen. Rel. Grav
Возможности хирургической коррекции спастичности у детей с ДЦП методом селективной дорзальной ризотомии
Creators: name: Hidalgo, Kevin Fernando Venegas
Publisher: name: figshare
Year: 2021
Subjects: subject: 110323 Surgery
subject: FOS: Clinical medicine
subject: 110904 Neurology and Neuromuscular Diseases

description: Оценка функциональных исходов селективной дорзальной ризотомии (СДР) у детей с детским церебральным параличом (ДЦП).
The interaction between business models and business reality
Creators: name: Kesting, Peter
Publisher: name: Journal of Business Models
Year: 2021

description: Purpose – The purpose of this paper is to conceptualize the connection between business model and business reality. On this basis, the paper aims to put the business models on a solid conceptual ground and to build bridges to its neighboring disciplines. In this way, this paper is intended to contribute to more terminological and conceptual rigor of the business model construct. In addition, this paper aims to conceptualize the processes of constructing and using business models for decision-making. Design/methodology/approach – This is a conceptual paper; it introduces and specifies a new construct, the status quo, as realistic counterpart to the business model. Based on this, it develops a model of the interaction between business model and status quo. Findings – The key finding of this paper is that business model and status quo are shaped (and need to be described) by different characteristics. The characteristics of the status quo result from repetition (stability) and routinization (efficiency, low resistance, etc.). The characteristics of the business model result from observation, abstraction and simplification (purpose, observer perspective, etc.). Originality/value – This is the first paper to develop the status quo as an independent construct for management research. It also offers the first comprehensive model of the relation between business model and business reality. Furthermore, it offers a new link between business model and routine. Keywords - business model; innovation; status quo; strategy; inertia; dynamic capabilities
description: Journal of Business Models, Vol. 9 No. 4 (2021): Vol 9, No 4. Journal of Business Models
Peer responsive interaction and AAC (Biggs et al., 2025)
Creators: name: Biggs, Elizabeth E.
name: Turner, Erin C.
name: Elchos, Emily
name: Spann, Emilee
name: Scotti, Kendra E.
Publisher: name: ASHA journals
Year: 2025
Subjects: classificationCode: 420110
subject: Speech pathology
classificationCode: 470101
subject: Communication studies
classificationCode: 390307
subject: Teacher education and professional development of educators

description: Purpose: Elementary-aged peers often need support for them to have positive interactions with classmates with autism who are minimally speaking (i.e., fewer than 30 functional spoken words). This study examined whether peers could learn to use responsive interaction strategies to support inclusive play and communication within a peer network intervention.Method: A single-case, multiple-baseline across-strategies design was used to evaluate whether an initial teaching session paired with coaching was effective to teach peers responsive interaction strategies that incorporated aided augmentative and alternative communication. Participants were two elementary-aged autistic students who were minimally speaking, four peers, and their educational team members.Results: The initial teaching paired with coaching was effective in teaching peers the three responsive interaction strategies called the Ways to Talk and Play. Additionally, the nature of interactions changed in beneficial ways when peers learned the Ways to Talk and Play. The strategies were viewed favorably by students with autism, peers, and educational team members.Conclusion: School teams can use intervention models such as this to improve outcomes for minimally speaking students with autism by equipping peers as responsive communication and play partners.Supplemental Material S1. Fidelity checklists for baseline sessions, peer teaching sessions, and intervention peer network sessions.Supplemental Material S2. Sample play menu.Supplemental Material S3. Books, lesson objectives, and lesson lengths for the social–emotional lessons during baseline.Supplemental Material S4. Interobserver agreement (IOA) percentages (occurrence) by participant and variable.Supplemental Material S5. Social validity ratings from peers, using 4-point rating scales specific to each question.Supplemental Material S6. Educator social validity ratings for the goals of the intervention (n = 5 educators).Biggs, E. E., Turner, E. C., Elchos, E., Spann, E., & Scotti, K. E. (2025). Teaching elementary-aged peers responsive interaction and augmentative and alternative communication strategies within a peer network intervention. Language, Speech, and Hearing Services in Schools, 56(2), 380–396. https://doi.org/10.1044/2025_LSHSS-24-00092
Extending the blended generalized extreme value distribution
Creators: name: Krakauer, Nir Y.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Applications (stat.AP)
subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: The generalized extreme value (GEV) distribution is commonly employed to help estimate the likelihood of extreme events in many geophysical and other application areas. The recently proposed blended generalized extreme value (bGEV) distribution modifies the GEV with positive shape parameter to avoid a hard lower bound that complicates fitting and inference. Here, the bGEV is extended to the GEV with negative shape parameter, avoiding a hard upper bound that is unrealistic in many applications. This extended bGEV is shown to improve on the GEV for forecasting heat and sea level extremes based on past data. Software implementing this bGEV and applying it to the example temperature and sea level data is provided.
Overlapping community detection in networks via sparse spectral decomposition
Creators: name: Arroyo, Jesús
name: Levina, Elizaveta
Publisher: name: arXiv
Year: 2020
Subjects: subject: Social and Information Networks (cs.SI)
subject: Machine Learning (cs.LG)
subject: Computation (stat.CO)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: We consider the problem of estimating overlapping community memberships in a network, where each node can belong to multiple communities. More than a few communities per node are difficult to both estimate and interpret, so we focus on sparse node membership vectors. Our algorithm is based on sparse principal subspace estimation with iterative thresholding. The method is computationally efficient, with a computational cost equivalent to estimating the leading eigenvectors of the adjacency matrix, and does not require an additional clustering step, unlike spectral clustering methods. We show that a fixed point of the algorithm corresponds to correct node memberships under a version of the stochastic block model. The methods are evaluated empirically on simulated and real-world networks, showing good statistical performance and computational efficiency.
On causality and closed geodesics of compact Lorentzian manifolds and static spacetimes
Creators: name: Sánchez, Miguel
Publisher: name: arXiv
Year: 2005
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53C50, 53C22, 58E10

description: Some results related to the causality of compact Lorentzian manifolds are proven: (1) any compact Lorentzian manifold which admits a timelike conformal vector field is totally vicious, and (2) a compact Lorentzian manifold covered regularly by a globally hyperbolic spacetime admits a timelike closed geodesic, if some natural topological assumptions (fulfilled, for example, if one of the conjugacy classes of deck transformations containing a closed timelike curve is finite) hold. As a consequence, any compact Lorentzian manifold conformal to a static spacetime is geodesically connected by causal geodesics, and admits a timelike closed geodesic.
description: 18 pages, 1 figure, Latex, accepted in Diff. Geom. Appl
Gauge and Gravity Amplitudes on the Celestial Sphere
Creators: name: Kalyanapuram, Nikhil
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The analytic structures of scattering amplitudes in gauge theory and gravity are examined on the celestial sphere. The celestial amplitudes in the two theories - computed by employing a regulated Mellin transform - can be compared at low multiplicity. It is established by direct computation that up to five external particles, the double copy relations of Kawai, Lewellen and Tye continue to hold identically, modulo certain multiplicative factors which are explicitly determined. Supersymmetric representations of the amplitudes are utilized throughout, manifesting the double copy structure between $\mathcal{N}=4$ super Yang-Mills and $\mathcal{N}=8$ supergravity on the celestial sphere.
description: v4: 20 pages, references added
Association of the IceCube neutrinos with blazars in the CGRaBS sample
Creators: name: Kouch, Pouya M.
name: Lindfors, Elina
name: Hovatta, Talvikki
name: Liodakis, Ioannis
name: Koljonen, Karri I. I.
name: Nilsson, Kari
name: Kiehlmann, Sebastian
name: Max-Moerbeck, Walter
name: Readhead, Anthony C. S.
name: Reeves, Rodrigo A.
name: Pearson, Timothy J.
name: Jormanainen, Jenni
name: Ramazani, Vandad Fallah
name: Graham, Matthew J.
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The origin of high-energy (HE) astrophysical neutrinos has remained an elusive hot topic in the field of HE astrophysics for the past decade. Apart from a handful of individual associations, the vast majority of HE neutrinos arise from unknown sources. While there are theoretically-motivated candidate populations, such as blazars -- a subclass of AGN with jets pointed towards our line-of-sight -- they have not yet been convincingly linked to HE neutrino production. Here, we perform a spatio-temporal association analysis between a sample of blazars (from CGRaBS catalog) in the radio and optical bands and the most up-to-date IceCube HE neutrino catalog. We find that if the IceCube error regions are enlarged by 1$^\circ$ in quadrature, to account for unknown systematic errors at maximal level, a spatio-temporal correlation between the multiwavelength light curves of the CGRaBS blazars and the IceCube HE neutrinos is hinted at least at a 2.17$σ$ significance level. On the other hand, when the IceCube error regions are taken as their published values, we do not find any significant correlations. A discrepancy in the blazar-neutrino correlation strengths, when using such minimal and enlarged error region scenarios, was also obtained in a recent study by the IceCube collaboration. In our study, this difference arises because several flaring blazars -- coinciding with a neutrino arrival time -- happen to narrowly miss the published 90\%-likelihood error region of the nearest neutrino event. For all of the associations driving our most significant correlations, the flaring blazar is much less than 1$^\circ$ away from the published error regions. Therefore, our results indicate that the question of the blazar-neutrino connection is highly sensitive to the reconstruction of the neutrino error regions, whose reliability is expected to improve with the next generation of neutrino observatories.
description: Accepted for publication in A&A, 24 pages, 10 figures, 2 tables, 3 electronic tables
Broken-Symmetry Ground States of the Heisenberg model on the Pyrochlore Lattice
Creators: name: Astrakhantsev, Nikita
name: Westerhout, Tom
name: Tiwari, Apoorv
name: Choo, Kenny
name: Chen, Ao
name: Fischer, Mark H.
name: Carleo, Giuseppe
name: Neupert, Titus
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: The spin-1/2 Heisenberg model on the pyrochlore lattice is an iconic frustrated three-dimensional spin system with a rich phase diagram. Besides hosting several ordered phases, the model is debated to possess a spin-liquid ground state when only nearest-neighbor antiferromagnetic interactions are present. Here, we contest this hypothesis with an extensive numerical investigation using both exact diagonalization and complementary variational techniques. Specifically, we employ a RVB-like many-variable Monte Carlo ansatz and convolutional neural network quantum states for (variational) calculations with up to $4\times 4^3$ and $4 \times 3^3$ spins, respectively. We demonstrate that these techniques yield consistent results, allowing for reliable extrapolations to the thermodynamic limit. Our main results are (1) the determination of the phase transition between the putative spin-liquid phase and the neighboring magnetically ordered phase and (2) a careful characterization of the ground state in terms of symmetry-breaking tendencies. We find clear indications of spontaneously broken inversion and rotational symmetry, calling the scenario of a featureless quantum spin-liquid into question. Our work showcases how many-variable variational techniques can be used to make progress in answering challenging questions about three-dimensional frustrated quantum magnets.
description: 9 pages, 5 figures
From Vision to Application: DARIAH's Services to Enable Researchers in SSH
Creators: name: Gray, Edward
Publisher: name: Zenodo
Year: 2022

description: Founded as an ERIC in 2014, DARIAH has long held a place in the SSH Research Landscape. Like any research infrastructure, or indeed any type of infrastructure, its work often passes unseen. That does not mean that DARIAH has been inactive, it simply means that the work carried out by the infrastructure focused more on the construction of our international research infrastructure and of the various national consortia, as well as policy and advocacy on behalf of our communities. DARIAH also served, and serves, as an excellent incubator for European project grants and the creation of project consortia. These important initiatives, however, are rarely seen or appreciated by the individual researcher. However, with the increasing maturity of the infrastructure and notably the SSH Open Marketplace and DARIAH Campus platforms, DARIAH can proudly boast services that appeal to the individual researcher. Joining with the existing, grassroots and researcher-led Working Groups, DARIAH now has multiple means of enabling research in social sciences and humanities in a way that is visible to the individual researcher. Our important unseen infrastructure work continues, and it is joined now by these more visible and tangible initiatives.
Measuring Stellar Radial Velocities with a Dispersed Fixed-Delay Interferometer
Creators: name: Mahadevan, Suvrath
name: van Eyken, Julian
name: Ge, Jian
name: DeWitt, Curtis
name: Fleming, Scott W.
name: Cohen, Roger
name: Crepp, Justin
name: Heuvel, Andrew Vanden
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We demonstrate the ability to measure precise stellar barycentric radial velocities with the dispersed fixed-delay interferometer technique using the Exoplanet Tracker (ET), an instrument primarily designed for precision differential Doppler velocity measurements using this technique. Our barycentric radial velocities, derived from observations taken at the KPNO 2.1 meter telescope, differ from those of Nidever et al. by 0.047 km/s (rms) when simultaneous iodine calibration is used, and by 0.120 km/s (rms) without simultaneous iodine calibration. Our results effectively show that a Michelson interferometer coupled to a spectrograph allows precise measurements of barycentric radial velocities even at a modest spectral resolution of R ~ 5100. A multi-object version of the ET instrument capable of observing ~500 stars per night is being used at the Sloan 2.5 m telescope at Apache Point Observatory for the Multi-object APO Radial Velocity Exoplanet Large-area Survey (MARVELS), a wide-field radial velocity survey for extrasolar planets around TYCHO-2 stars in the magnitude range 7.6
description: 9 pages, 4 figures. Accepted for publication in ApJ
Spectroscopic abundance analysis of dwarfs in young open cluster IC 4665
Creators: name: Shen, Z. -X.
name: Jones, B.
name: Lin, D. N. C.
name: Liu, X. -W.
name: Li, S. -L.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report a detailed spectroscopic abundance analysis for a sample of 18 F-K dwarfs of the young open cluster IC 4665. Stellar parameters and element abundances of Li, O, Mg, Si, Ca, Ti, Cr, Fe and Ni have been derived using the spectroscopic synthesis tool SME (Spectroscopy Made Easy). Within the measurement uncertainties the iron abundance is uniform with a standard deviation of 0.04 dex. No correlation is found between the iron abundance and the mass of the stellar convective zone, and between the Li abundance and the Fe abundance. In other words, our results do not reveal any signature of accretion and therefore do not support the scenario that stars with planets (SWPs) acquire their on the average higher metallicity compared to field stars via accretion of metal-rich planetary material. Instead the higher metallicity of SWPs may simply reflect the fact that planet formation is more efficient in high metallicity environs. However, since that many details of the planet system formation processes remain poorly understood, further studies are needed for a final settlement of the problem of the high metallicity of SWPs. The standard deviation of [Fe/H] deduced from our observations, taken as an upper limit on the metallicity dispersion amongst the IC 4665 member stars, has been used to constrain proto-planetary disk evolution, terrestrial and giant planets formation and evolution processes. Our results do not support the possibility that the migration of gas giants and the circularization of terrestrial planets' orbits are regulated by their interaction with a residual population of planetesimals and dust particles.
description: 18 pages, 6 figures, accepted for publication in ApJ
Exploring a primordial solution for early black holes detected with the JWST
Creators: name: Dayal, Pratika
Publisher: name: arXiv
Year: 2024
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The James Webb Space Telescope (JWST) has unearthed black holes as massive as $10^{6.2-8.1}M_\odot$ at redshifts of $z \sim 8.5-10.6$ with many systems showing unexpectedly high black hole to stellar mass ratios >=30%, posing a crucial challenge for theoretical models. Using analytic calculations, we explore the combination of {\it astrophysical} seeding mechanisms and Eddington accretion rates that can explain the observed objects. We then appeal to {\it cosmological} primordial black hole (PBH) seeds and show how these present an alternative path for "seeding" early structures and their baryonic contents. Assuming seeding (via astrophysical means) at a redshift of $z_{\rm seed}=25$ and continuous accretion, all of the black holes studied here can either be explained through super-Eddington accretion (at an Eddington fraction of $f_{\rm Edd}<= 2.1 $) onto low-mass ($100M_\odot$) seeds or Eddington-limited accretion onto high-mass ($10^5 M_\odot$) seeds. The upper limit, where we assume a primordial origin for all of these black holes, yields a continuous primordial black hole mass function (between $10^{-5.25}$ and $10^{3.75} M_\odot$) and a fractional PBH value $<= 10^{-12}$, in good agreement with observational constraints. Starting at the redshift of matter-radiation equality ($z \sim 3400$), we show how PBH-driven structure formation can reproduce the observed stellar and black hole masses for two of the highest redshift black holes (UHZ1 and GHZ9 at $z \sim 10.3$) with the same parameters governing star formation, black hole accretion and their feedbacks. Exploring a wide swathe of model parameter space for GHZ9, we find black hole-to-stellar mass ratios ranging between $0.1-1.86$ i.e. in some cases (of high supernova feedback), the black hole grows to be more massive than the stellar mass of its host, presenting an attractive alternative to seeding these puzzling early systems.
description: Accepted to A&A