cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Semi-classical Approach to Quantum Spin Ice
Creators: name: Kwasigroch, M. P.
name: Douçot, B.
name: Castelnovo, C.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We propose a semi-classical description of the low-energy properties of quantum spin ice in the strong Ising limit. Within the framework of a semiclassical, perturbative Villain expansion, that can be truncated at arbitrary order, we give an analytic and quantitative treatment of the deconfining phase. We find that photon-photon interactions significantly renormalise the speed of light and split the two transverse photon polarisations at intermediate wavevectors. We calculate the photon velocity and the ground state energy to first and second order in perturbation theory, respectively. The former is in good agreement with recent numerical simulations.
description: 11 pages, 3 figures
Sky reconstruction from transit visibilities: PAON-4 and Tianlai Dish Array
Creators: name: Zhang, Jiao
name: Ansari, Reza
name: Chen, Xuelei
name: Campagne, Jean-Eric
name: Magneville, Christophe
name: Wu, Fengquan
Publisher: name: arXiv
Year: 2016
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The spherical harmonics $m$-mode decomposition is a powerful sky map reconstruction method suitable for radio interferometers operating in transit mode. It can be applied to various configurations, including dish arrays and cylinders. We describe the computation of the instrument response function, the point spread function (PSF), transfer function, the noise covariance matrix and noise power spectrum. The analysis in this paper is focused on dish arrays operating in transit mode. We show that arrays with regular spacing have more pronounced side lobes as well as structures in their noise power spectrum, compared to arrays with irregular spacing, specially in the north-south direction. A good knowledge of the noise power spectrum $C^{\mathrm{noise}}(\ell)$ is essential for intensity mapping experiments as non uniform $C^{\mathrm{noise}}(\ell)$ is a potential problem for the measurement of the HI power spectrum. Different configurations have been studied to optimise the PAON-4 and Tianlai dish array layouts. We present their expected performance and their sensitivities to the 21-cm emission of the Milky Way and local extragalactic HI clumps
description: 20 pages, 18 figures - Submitted to MNRAS ( the appendix A,B are not included in the accepted version)
Cross-cultural adaptation and validation of the Neck Bournemouth Questionnaire into Urdu language
Creators: name: Farooq, Muhammad Nazim
name: Naz, Somiya
name: Mughal, Aqsa Shafiq
name: Sohail, Sara
name: Anis, Maham
Publisher: name: Taylor & Francis
Year: 2023
Subjects: subject: Space Science
subject: Ecology
subject: FOS: Biological sciences
subject: Biological Sciences not elsewhere classified
subject: Science Policy

description: The Neck Bournemouth Questionnaire (NBQ) has been translated and validated in a number of languages and has good psychometric properties for assessing neck pain. However, an Urdu translation is currently unavailable. To translate, cross-culturally adapt, and validate the NBQ into Urdu language (NBQ-U) in patients with nonspecific neck pain (NSNP). The NBQ was translated and cross-culturally adapted into Urdu using previously described guidelines. The study included 150 Urdu-speaking patients with NSNP and 50 healthy participants. All participants completed the NBQ-U, Urdu version of neck disability index (NDI-U), neck pain and disability scale (NPDS), and numerical pain rating scale (NPRS). After three weeks of physical therapy treatment, the patients completed all of the above-mentioned questionnaires, along with the global rating of change scale. Reliability, validity, and responsiveness were all tested. The NBQ-U demonstrated excellent test-retest reliability (intra-class correlation coefficient = 0.92) and high internal consistency (Cronbach’s alpha = 0.89). The NBQ-U showed moderate to strong correlations with NDI-U, NPDS, and NPRS (r = 0.67–0.73, P < .001). The results revealed a significant difference between patients and healthy controls in the NBQ-U total scores (P < .001). The NBQ-U has a single factor structure with no floor or ceiling effects for individual item scores or total scores. A significant difference in the NBQ-U change scores between the stable and the improved groups (P < .001) confirmed its responsiveness. Furthermore, the NBQ-U change score showed moderate correlations with NDI-U, NPDS, and NPRS change scores (r = 0.52–0.62, P < .001). In Urdu-speaking patients with NSNP, the NBQ-U demonstrated good reliability, validity, and responsiveness.
Using Ensemble Monte Carlo Methods to Evaluate Non-Equilibrium Green's Functions, II. Polar-Optical Phonons
Creators: name: Ferry, David K.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: In semi-classical transport, it has become common practice over the past few decades to use ensemble Monte Carlo (EMC) methods for the simulation of transport in semiconductor devices. This method utilizes particles while still addressing the full physics within the device, leaving the computational difficulties to the computer. More recently, the study of quantum mechanical effects within the devices, have become important, and have been addressed in semiconductor devices using non-equilibrium Green's functions (NEGF). In using NEGF, one faces considerable computational difficulties. Recently, a particle approach to NEGF has been proposed [ 1], and preliminary results presented for non-polar optical phonons, which are very localized scattering centers. Here, the problems with long-range polar-optical phonons are discussed and results of the particle-based simulation presented.
description: 9 pages, 9 figures
Risk-Based Authentication for OpenStack: A Fully Functional Implementation and Guiding Example
Creators: name: Unsel, Vincent
name: Wiefling, Stephan
name: Gruschka, Nils
name: Iacono, Luigi Lo
Publisher: name: arXiv
Year: 2023
Subjects: subject: Cryptography and Security (cs.CR)
subject: Human-Computer Interaction (cs.HC)
subject: FOS: Computer and information sciences

description: Online services have difficulties to replace passwords with more secure user authentication mechanisms, such as Two-Factor Authentication (2FA). This is partly due to the fact that users tend to reject such mechanisms in use cases outside of online banking. Relying on password authentication alone, however, is not an option in light of recent attack patterns such as credential stuffing. Risk-Based Authentication (RBA) can serve as an interim solution to increase password-based account security until better methods are in place. Unfortunately, RBA is currently used by only a few major online services, even though it is recommended by various standards and has been shown to be effective in scientific studies. This paper contributes to the hypothesis that the low adoption of RBA in practice can be due to the complexity of implementing it. We provide an RBA implementation for the open source cloud management software OpenStack, which is the first fully functional open source RBA implementation based on the Freeman et al. algorithm, along with initial reference tests that can serve as a guiding example and blueprint for developers.
description: 7 pages, 3 figures, 1 table
A platform for analysis of nanoscale liquids with an integrated sensor array based on 2-d material
Creators: name: Engel, M.
name: Bryant, P. W.
name: Neumann, R. F.
name: Giro, R.
name: Feger, C.
name: Avouris, P.
name: Steiner, M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Analysis of nanoscale liquids, including wetting and flow phenomena, is a scientific challenge with far reaching implications for industrial technologies. We report the conception, development, and application of an integrated platform for the experimental characterization of liquids at the nanometer scale. The platform combines the sensing functionalities of an integrated, two-dimensional electronic device array with in situ application of highly sensitive optical micro-spectroscopy and atomic force microscopy. We demonstrate the performance capabilities of the platform with an embodiment based on an array of integrated, optically transparent graphene sensors. The application of electronic and optical sensing in the platform allows for differentiating between liquids electronically, for determining a liquid's molecular fingerprint, and for monitoring surface wetting dynamics in real time. In order to explore the platform's sensitivity limits, we record topographies and optical spectra of individual, spatially isolated sessile oil emulsion droplets having volumes of less than ten attoliters. The results demonstrate that integrated measurement functionalities based on two-dimensional materials have the potential to push lab-on-chip based analysis from the microscale to the nanoscale.
description: 20 pages, 5 figures
Low-energy spin excitations in Li(0.8)Fe(0.2)ODFeSe superconductor studied with inelastic neutron scattering
Creators: name: Ma, Mingwei
name: Wang, Lichen
name: Bourges, Philippe
name: Sidis, Yvan
name: Danilkin, Sergey
name: Li, Yuan
Publisher: name: arXiv
Year: 2016
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We report an inelastic neutron scattering study of single crystals of (Li$_{0.8}$Fe$_{0.2}$)ODFeSe. Temperature-dependent low-energy spin excitations are observed near $\mathbf{Q}=$ (0.5, 0.27, 0.5) and equivalent wave vectors symmetrically surrounding $\mathbf{Q}=$ (0.5, 0.5, 0.5) in the 1-Fe Brillouin zone, consistent with a Fermi-surface-nesting description. The excitations are broadly distributed in energy, ranging from 16 to 35 meV. Upon cooling below the superconducting critical temperature ($T_\mathrm{c}$), magnetic response below twice the superconducting gap $2Δ_\mathrm{SC}$ exhibits an abrupt enhancement, consistent with the notion of spin resonance, whereas the response at higher energies increases more gradually with only a weak anomaly at $T_\mathrm{c}$. Our results suggest that (Li$_{0.8}$Fe$_{0.2}$)ODFeSe might be on the verge of a crossover between different Cooper-pairing channels with distinct symmetries.
description: 5 pages, 4 figures
Plantar intrinsic foot muscle activation during functional exercises compared to isolated foot exercises in younger adults
Creators: name: Willemse, Lydia
name: Wouters, Eveline J. M.
name: Pisters, Martijn F.
name: Vanwanseele, Benedicte
Publisher: name: Taylor & Francis
Year: 2024
Subjects: subject: Biochemistry
subject: Space Science
subject: Medicine
subject: Genetics
subject: FOS: Biological sciences
subject: Physiology
subject: Environmental Sciences not elsewhere classified
subject: Ecology
subject: Cancer

description: Training the plantar intrinsic foot muscles (PIFMs) has the potential to benefit patients with lower extremity musculoskeletal conditions as well as the aged population. Isolated foot exercises, often standard in clinical practice, are difficult to perform, whereas functional exercises are much easier to accomplish. However, it is unclear whether functional exercises are comparable to isolated foot exercises in activating the PIFMs. This study aims to compare the activation of PIFMs between functional exercises versus isolated foot exercises. Using surface electromyography (EMG), muscle activation of three PIFMs was measured in four functional exercises (i.e. normal/unstable toe stance, toe walking, and hopping) versus a muscle-specific isolated foot exercise in 29 younger adults, resulting in 12 comparisons. Functional exercises showed larger mean EMG amplitudes than the isolated foot exercises in 25% of the 12 comparisons, while there was no difference in the remaining 75%. Functional exercises provoked comparable or even more activation of the PIFMs than isolated foot exercises. Given that functional exercises are easier to perform, this finding indicates the need to further investigate the effectiveness of functional exercises in physical therapy to improve muscle function and functional task performance in populations that suffer from PIFM weakness or dysfunction.
ALMA hints at the presence of turbulent disk galaxies at z > 5
Creators: name: Parlanti, E.
name: Carniani, S.
name: Pallottini, A.
name: Cignoni, M.
name: Cresci, G.
name: Kohandel, M.
name: Mannucci, F.
name: Marconi, A.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: High-redshift galaxies are expected to be more turbulent than local galaxies because of their smaller size and higher star formation and thus stronger feedback from star formation, frequent mergers events, and gravitational instabilities. However, this scenario has recently been questioned by the observational evidence of a few galaxies at z~4-5 with a gas velocity dispersion similar to what is observed in the local population. Our goal is to determine whether galaxies in the first Gyrs of the Universe have already formed a dynamically cold rotating disk similar to the local counterparts. We studied the gas kinematic of 22 main-sequence star-forming galaxies at z > 5 and determined their dynamical state by estimating the ratio of the rotational velocity and of the gas velocity dispersion. We mined the ALMA archive and exploited the [CII] and [OIII] observations to perform a kinematic analysis of the cold and warm gas of z>5 main-sequence galaxies. The gas kinematics of the high-z galaxies is consistent within the errors with rotating but turbulent disks. We infer a velocity dispersion that is systematically higher by 4 times than the local galaxy population and the z~5 dust-obscured galaxies reported in the literature. The difference between our results and those reported at similar redshift can be ascribed to the systematic difference in the galaxy properties in the two samples: the disks of massive dusty galaxies are dynamically colder than the disks of dust-poor galaxies. The comparison with the theoretical predictions suggests that the main driver of the velocity dispersion in high-z galaxies is the gravitational energy that is released by the transport of mass within the disk. Finally, we stress that future deeper ALMA high-angular resolution observations are crucial to constrain the kinematic properties of high-z galaxies and to distinguish rotating disks from kpc-scale mergers.
description: 14 pages, 11 figures, 1 tables, accepted for publication in A&A
ALMA's view of the Sun's nearest neighbours: The submm/mm SEDs of the alpha Centauri binary and a new source
Creators: name: Liseau, R.
name: De la Luz, V.
name: O'Gorman, E.
name: Bertone, E.
name: Chavez, M.
name: Tapia, F.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The precise mechanisms that provide the non-radiative energy for heating the chromosphere and the corona of the Sun and other stars are at the focus of intense contemporary research. Observations at submm/mm wavelengths are particularly useful to obtain information about the run of the temperature in the upper atmosphere of Sun-like stars. We used ALMA to study the chromospheric emission of the aCen binary system in all six available frequency bands during Cycle2 in 2014/15. Since ALMA is an interferometer, the multi-telescope array is particularly suited for the observation of point sources. With its large collecting area, the sensitivity is high enough to allow the observation of nearby main-sequence stars at submm/mm wavelengths for the first time. The comparison of the observed spectral energy distributions with theoretical model computations provides the chromospheric structure in terms of temperature and density above the stellar photosphere and the quantitative understanding of the primary emission processes. Both stars were detected and resolved at all ALMA frequencies. For both aCenA and B, the existence and location of the temperature minima, firstly detected from space with Herschel, are well reproduced by the theoretical models of this paper. For aCenB, the temperature minimum is deeper than for A and occurs at a lower height in the atmosphere, but for both stars, Tmin/Teff is consistently lower than what is derived from optical and UV data. The submm/mm emission of the aCen stars is indeed very well reproduced by modified chromospheric models of the Quiet Sun. This most likely means that the non-radiative heating mechanisms of the upper atmosphere that are at work in the Sun are operating also in other solar-type stars.
description: 10 pages, 7 figures, accepted for Astron. & Astrophys., Section 8
Plantar intrinsic foot muscle activation during functional exercises compared to isolated foot exercises in younger adults
Creators: name: Willemse, Lydia
name: Wouters, Eveline J. M.
name: Pisters, Martijn F.
name: Vanwanseele, Benedicte
Publisher: name: Taylor & Francis
Year: 2023
Subjects: subject: Biochemistry
subject: Space Science
subject: Medicine
subject: Genetics
subject: FOS: Biological sciences
subject: Physiology
subject: Environmental Sciences not elsewhere classified
subject: Ecology
subject: Cancer

description: Training the plantar intrinsic foot muscles (PIFMs) has the potential to benefit patients with lower extremity musculoskeletal conditions as well as the aged population. Isolated foot exercises, often standard in clinical practice, are difficult to perform, whereas functional exercises are much easier to accomplish. However, it is unclear whether functional exercises are comparable to isolated foot exercises in activating the PIFMs. This study aims to compare the activation of PIFMs between functional exercises versus isolated foot exercises. Using surface electromyography (EMG), muscle activation of three PIFMs was measured in four functional exercises (i.e. normal/unstable toe stance, toe walking, and hopping) versus a muscle-specific isolated foot exercise in 29 younger adults, resulting in 12 comparisons. Functional exercises showed larger mean EMG amplitudes than the isolated foot exercises in 25% of the 12 comparisons, while there was no difference in the remaining 75%. Functional exercises provoked comparable or even more activation of the PIFMs than isolated foot exercises. Given that functional exercises are easier to perform, this finding indicates the need to further investigate the effectiveness of functional exercises in physical therapy to improve muscle function and functional task performance in populations that suffer from PIFM weakness or dysfunction.
Detection of TiO and VO in the atmosphere of WASP-121b and Evidence for its temporal variation
Creators: name: Ouyang, Qinglin
name: Wang, Wei
name: Zhai, Meng
name: Chen, Guo
name: Rojo, Patricio
name: Liu, Yujuan
name: Zhao, Fei
name: Huang, Jia-Sheng
name: Zhao, Gang
Publisher: name: arXiv
Year: 2023
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We report the transit observations of the ultra hot Jupiter WASP-121b using the Goodman High Throughput Spectrograph (GHTS) at the 4-meter ground-based telescope Southern Astrophysical Research Telescope (SOAR), covering the wavelength range $502-900$ nm. By dividing the target and reference star into 19 spectroscopic passbands and applying differential spectrophotometry, we derive spectroscopic transit light curves and fit them using Gaussian process framework to determine transit depths for every passbands. The obtained optical transmission spectrum shows a steep increased slope toward the blue wavelength, which seems to be too steep to be accounted for by the Rayleigh scattering alone. We note that the transmission spectrum from this work and other works differ obviously from each other, which was pointed out previously by \citet{Wilson2021} as evidence for temporal atmospheric variation. We perform a free chemistry retrieval analysis on the optical transmission spectra from this work and the literature HST/WFC3 NIR spectrum. We determine TiO, VO and H$_{2}$O with abundances of $-5.95_{-0.42}^{+0.47}$ dex, $-6.72_{-1.79}^{+0.51}$ dex, and $-4.13_{-0.46}^{+0.63}$ dex, respectively. We compare the abundances of all these three molecules derived from this work and previous works, and find that they are not consistent with each other, indicating the chemical compositions of the terminator region may change over long timescales. Future multi-epoch and high-precision transit observations are required to further confirm this phenomena. We note that when combining the transmission spectra in the optical and in NIR in retrieval analysis, the abundances of V and VO, the NIR-to-optical offset and the cloud deck pressure may be coupled with each other.
description: 23 pages, 13 figures, 6 tables. Accepted for publication in Research in Astronomy and Astrophysics
The Gould's Belt Distances Survey (GOBELINS) III. The distance to the Serpens/Aquila Molecular Complex
Creators: name: Ortiz-León, Gisela N.
name: Dzib, Sergio A.
name: Kounkel, Marina A.
name: Loinard, Laurent
name: Mioduszewski, Amy J.
name: Rodríguez, Luis F.
name: Torres, Rosa M.
name: Pech, Gerardo
name: Rivera, Juana L.
name: Hartmann, Lee
name: Boden, Andrew F.
name: Evans, Neal J.
name: Briceño, Cesar
name: Tobin, John J.
name: Galli, Phillip A. B.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We report on new distances and proper motions to seven stars across the Serpens/Aquila complex. The observations were obtained as part of the Gould's Belt Distances Survey (GOBELINS) project between September 2013 and April 2016 with the Very Long Baseline Array (VLBA). One of our targets is the proto-Herbig AeBe object EC 95, which is a binary system embedded in the Serpens Core. For this system, we combined the GOBELINS observations with previous VLBA data to cover a total period of ~8 years, and derive the orbital elements and an updated source distance. The individual distances to sources in the complex are fully consistent with each other, and the mean value corresponds to a distance of $436.0\pm9.2$~pc for the Serpens/W40 complex. Given this new evidence, we argue that Serpens Main, W40 and Serpens South are physically associated and form a single cloud structure.
description: Accepted for publication in ApJ
Turbulence, Transport and Waves in Ohmic Dead Zones
Creators: name: Gole, Daniel
name: Simon, Jacob B.
name: Lubow, Stephen H.
name: Armitage, Philip J.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We use local numerical simulations to study a vertically stratified accretion disk with a resistive mid-plane that damps magnetohydrodynamic (MHD) turbulence. This is an idealized model for the dead zones that may be present at some radii in protoplanetary and dwarf novae disks. We vary the relative thickness of the dead and active zones to quantify how forced fluid motions in the dead zone change. We find that the residual Reynolds stress near the mid-plane decreases with increasing dead zone thickness, becoming negligible in cases where the active to dead mass ratio is less than a few percent. This implies that purely Ohmic dead zones would be vulnerable to episodic accretion outbursts via the mechanism of Martin & Lubow (2011). We show that even thick dead zones support a large amount of kinetic energy, but this energy is largely in fluid motions that are inefficient at angular momentum transport. Confirming results from Oishi & Mac Low (2009), the perturbed velocity field in the dead zone is dominated by an oscillatory, vertically extended circulation pattern with a low frequency compared to the orbital frequency. This disturbance has the properties predicted for the lowest order r mode in a hydrodynamic disk. We suggest that in a global disk similar excitations would lead to propagating waves, whose properties would vary with the thickness of the dead zone and the nature of the perturbations (isothermal or adiabatic). Flows with similar amplitudes would buckle settled particle layers and could reduce the efficiency of pebble accretion.
description: 14 pages, 17 figures
D7.3 – Communication, dissemination, and stakeholders engagement strategy and plan V1.0
Creators: name: Abergas-Arteza, Julie
Publisher: name: Zenodo
Year: 2021
Subjects: QMC
communication strategy & plan

description: The main goal of the TREX Centre of Excellence (CoE) is to enable the community codes for stochastic quantum chemical simulations to successfully exploit the most advanced European computing facilities, i.e., the EuroHPC pre-exascale and exascale machines, and foster the use of supercomputers with energy-efficient accelerators (e.g., GPU) by means of state-of-the-art quantum Monte Carlo (QMC) codes, developed in Europe and internationally recognised as key algorithmic assets. This will be achieved via a co-design approach to the development of the QMC community codes in order to prepare them for the next generations of HPC hardware. In line with this goal, this document sets out an effective communication, dissemination and stakeholder engagement strategy to be implemented by the consortium during the 36 months of the project. Consistent and content-rich communication is strategic to showcase the results and impact of the TREX project. This plan has been built on a continuous set of actions of communication and dissemination campaigns for the main TREX assets, primarily the TREX community codes for advanced QMC simulations, complex scalable workflow, and training and educational activities, ensuring coverage of all stakeholders and adequate visibility worldwide. The custom-made TREX web platform is at the heart of the engagement, outreach and exploration strategy of the project, it is the technological engine behind the technical support to end-users of TREX software, and hands-on workshops to forge a new generation of code developers. Various communication and promotional campaigns are presented in this document, with detailed timelines presenting the activities that will be put in place. For each of these campaigns, specific communication, dissemination, and stakeholder engagement activities and synergies within the EU HPC ecosystem are detailed to ensure the successful achievement of the project objectives
Symmetry-based requirement for the measurement of electrical and thermal Hall conductivity under an in-plane magnetic field
Creators: name: Kurumaji, Takashi
Publisher: name: arXiv
Year: 2023
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The in-plane (thermal) Hall effect is an unconventional transverse response when the applied magnetic field is in the (heat) current plane. In contrast to the normal Hall effect, the in-plane Hall effect requires the absence of certain crystal symmetries, and possibly manifests a non-trivial topology of quantum materials. An accurate estimation of the intrinsic in-plane (thermal) Hall conductivity is crucial to identify the underlying mechanisms as in the case of the Kitaev spin-liquid candidate alpha-RuCl3. Here, we give the symmetry conditions for the in-plane Hall effect and discuss the implications that may impede the experimental evaluation of the in-plane (thermal) Hall conductivity within the single-device measurement. First, the lack of symmetry in crystals can create merohedral twin domains that cancel the total Hall signal. Second, even in a twin-free crystal, the intrinsic response is potentially contaminated by the out-of-plane conduction in three-dimensional systems, which is systematically unavoidable in the in-plane Hall systems. Third, even in a quasi-two-dimensional system, the conversion of (thermal) resistivity, rho (lambda), to (thermal) conductivity, sigma (kappa) requires protocols beyond the widely-used simplified formula due to the lack of in-plane-rotational symmetry. In principle, two independent sample devices are necessary to accurately estimate the s_xy (k_xy). As a case study, we discuss the half-integer quantization of the in-plane thermal Hall effect in the spin-disordered state of alpha-RuCl3. For an accurate measurement of the thermal Hall effect, it is necessary to avoid crystals with the merohedral twins contributing oppositely to k_xy, while the out-of-plane transport may have a negligible effect. To deal with the field-induced rotational-symmetry breaking, we propose two symmetry-based protocols, improved single-device and two-device methods.
description: Main: 9 pages, 6 figs; Supple: 7 pages, 5 figs
Theridion circuitum Gao & Li 2014, sp. nov.
Creators: name: Gao, Cai-Xia
name: Li, Shu-Qiang
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Theridiidae
Theridion
Theridion circuitum

description: Theridion circuitum sp. nov. (Figs 78–80) Holotype ♂, China, Yunnan, Xishuangbanna, Menglun Nature Reserve, primary tropical seasonal rainforest (21º54.725'N, 101º13.261'E), 8 August 2007, Guo Zheng leg. Etymology. The specific name derives from the Latin adjective circuitus and means revolving, in reference to the winding embolus. Diagnosis. The new species differs from other species of the genus by the embolus curving; conductor winding, with distal furcation. Male. Total length 1.45. Prosoma 0.63 long, 0.50 wide, flat, grey, with black stripes, without seta. Sternum 0.38 long, 0.38 wide, grey. Opisthosoma 0.88 long, 0.75 wide, grey, with pale spots, without seta, with colulus. Eye measurements: AME 0.08, ALE 0.06, PME 0.06, PLE 0.06, AME-AME 0.09, AME-ALE 0.03, PME-PME 0.10, PME-PLE 0.05. Clypeus height about 2.00 times AME diameter, yellow, with apophysis. Chelicerae: yellow, without spot or tooth; fangs long and slender. Endites: 0.25 long, 0.10 wide, grey, with brown pro-edges. Labium fused with sternum, 0.08 long, 0.18 wide, with 2 setae, grey. Leg measurements: I 2.50 (0.75, 0.23, 0.63, 0.46, 0.43); II 1.90 (0.65, 0.19, 0.43, 0.33, 0.30); III 1.09 (0.38, 0.13, 0.19, 0.19, 0.20); IV 1.60 (0.61, 0.15, 0.31, 0.28, 0.25). Leg I yellow to grey, without spines, with only soft setae. Legs II–IV similar to leg I. Pedipalpus (Figs 78A–B, 79A–B, 80A–D): tibia yellow to black, with 2 trichobothria; cymbium yellow to black; paracymbium hooded; subtegulum broad; tegulum smooth, without apophysis; median apophysis smooth, without protrusion; embolus long, curved; conductor long, winding, with 2 apophyses; tegular apophysis with distal branches. Female. Unknown. Distribution. Only known from type locality (Yunnan).
description: Published as part of Gao, Cai-Xia & Li, Shu-Qiang, 2014, Comb-footed spiders (Araneae: Theridiidae) in the tropical rainforest of Xishuangbanna, Southwest China, pp. 1-135 in Zoological Systematics 39 (1) on page 98, DOI: 10.11865/zs20140101, http://zenodo.org/record/7475365
How primordial is the structure of comet 67P/C-G? Combined collisional and dynamical models suggest a late formation
Creators: name: Jutzi, M.
name: Benz, W.
name: Toliou, A.
name: Morbidelli, A.
name: Brasser, R.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: There is an active debate about whether the properties of comets as observed today are primordial or, alternatively, if they are a result of collisional evolution or other processes. We investigate the effects of collisions on a comet with a structure like 67P/C-G. We develop scaling laws for the critical specific impact energies required for a significant shape alteration. These are then used in simulations of the combined dynamical and collisional evolution of comets in order to study the survival probability of a primordially formed object with a shape like 67P/C-G. The effects of impacts on comet 67P/C-G are studied using a SPH shock physics code. The resulting critical specific impact energy defines a minimal projectile size which is used to compute the number of shape-changing collisions in a set of dynamical simulations. These simulations follow the dispersion of the trans-Neptunian disk during the giant planet instability, the formation of a scattered disk, and produce 87 objects that penetrate into the inner solar system with orbits consistent with the observed JFC population. The collisional evolution before the giant planet instability is not considered here. Hence, our study is conservative in its estimation of the number of collisions. We find that in any scenario considered here, comet 67P/C-G would have experienced a significant number of shape-changing collisions, if it formed primordially. This is also the case for generic bi-lobe shapes. Our study also shows that impact heating is very localized and that collisionally processed bodies can still have a high porosity. Our study indicates that the observed bi-lobe structure of comet 67P/C-G may not be primordial, but might have originated in a rather recent event, possibly within the last 1 Gy. This may be the case for any kilometer-sized two-component cometary nuclei.
description: Astronomy & Astrophysics, accepted pending minor revisions
Bubbles of Nothing and Supersymmetric Compactifications
Creators: name: Blanco-Pillado, Jose J.
name: Shlaer, Benjamin
name: Sousa, Kepa
name: Urrestilla, Jon
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We investigate the non-perturbative stability of supersymmetric compactifications with respect to decay via a bubble of nothing. We show examples where this kind of instability is not prohibited by the spin structure, i.e., periodicity of fermions about the extra dimension. However, such "topologically unobstructed" cases do exhibit an extra-dimensional analog of the well-known Coleman-De Luccia suppression mechanism, which prohibits the decay of supersymmetric vacua. We demonstrate this explicitly in a four dimensional Abelian-Higgs toy model coupled to supergravity. The compactification of this model to $M_3 \times S_1$ presents the possibility of vacua with different windings for the scalar field. Away from the supersymmetric limit, these states decay by the formation of a bubble of nothing, dressed with an Abelian-Higgs vortex. We show how, as one approaches the supersymmetric limit, the circumference of the topologically unobstructed bubble becomes infinite, thereby preventing the realization of this decay. This demonstrates the dynamical origin of the decay suppression, as opposed to the more familiar argument based on the spin structure. We conjecture that this is a generic mechanism that enforces stability of any topologically unobstructed supersymmetric compactification.
description: 33 pages, 9 figures
Quantum Enhanced Correlation Matrix Memories via States Orthogonalisation
Creators: name: Mastriani, Mario
name: Naiouf, Marcelo
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: This paper introduces a Quantum Correlation Matrix Memory (QCMM) and Enhanced QCMM (EQCMM), which are useful to work with quantum memories. A version of classical Gram-Schmidt orthogonalisation process in Dirac notation (called Quantum Orthogonalisation Process: QOP) is presented to convert a non-orthonormal quantum basis, i.e., a set of non-orthonormal quantum vectors (called qudits) to an orthonormal quantum basis, i.e., a set of orthonormal quantum qudits. This work shows that it is possible to improve the performance of QCMM thanks QOP algorithm. Besides, the EQCMM algorithm has a lot of additional fields of applica-tions, e.g.: Steganography, as a replacement Hopfield Net-works, Bi-level image processing, etc. Finally, it is important to mention that the EQCMM is an extremely easy to implement in any firmware.
description: 5 pages, 4 figures. arXiv admin note: text overlap with arXiv:quant-ph/0107012 by other authors without attribution
Scaling in erosion of landscapes: Renormalization group analysis of a model with turbulent mixing
Creators: name: Antonov, N. V.
name: Kakin, P. I.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences
subject: 82C28

description: The model of landscape erosion, introduced in [{\it Phys. Rev. Lett.} {\bf 80}: 4349 (1998); {\it J. Stat. Phys.} {\bf 93}: 477 (1998)] and modified in [{\it Theor. Math. Phys.} - in press; arXiv:1602.00432], is advected by anisotropic velocity field. The field is Gaussian with vanishing correlation time and the pair correlation function of the form $\propto δ(t-t') / k_{\bot}^{d-1+ξ}$, where $k_{\bot}=|{\bf k}_{\bot}|$ and ${\bf k}_{\bot}$ is the component of the wave vector, perpendicular to a certain preferred direction -- the $d$-dimensional generalization of the ensemble introduced by Avellaneda and Majda [{\it Commun. Math. Phys.} {\bf 131}: 381 (1990)]. Analogous to the case without advection, the model is multiplicatively renormalizable and has infinitely many coupling constants. The one-loop counterterm is derived in a closed form in terms of the certain function $V(h)$, entering the original stochastic equation, and its derivatives with respect to the height field $h(t,{\bf x})$. The full infinite set of the one-loop renormalization constants, $β$-functions and anomalous dimensions is obtained from the Taylor expansion of the counter-term. Instead of a two-dimensional surface of fixed points there is two such surfaces; they are likely to contain infrared attractive region(s). If that is the case, the model exhibits scaling behaviour in the infrared range. The corresponding critical exponents are nonuniversal because they depend on the coordinates of the fixed points on the surface; they also satisfy certain universal exact relation.
description: Latex source, 13 pages, no figures
Optical patterning of trapped charge in nitrogen-doped diamond
Creators: name: Jayakumar, Harishankar
name: Henshaw, Jacob
name: Dhomkar, Siddharth
name: Pagliero, Daniela
name: Laraoui, Abdelghani
name: Manson, Neil B.
name: Albu, Remus
name: Doherty, Marcus W.
name: Meriles, Carlos A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The nitrogen-vacancy (NV) centre in diamond is emerging as a promising platform for solid-state quantum information processing and nanoscale metrology. Of interest in these applications is the manipulation of the NV charge, which can be attained by optical excitation. Here we use two-color optical microscopy to investigate the dynamics of NV photo-ionization, charge diffusion, and trapping in type-1b diamond. We combine fixed-point laser excitation and scanning fluorescence imaging to locally alter the concentration of negatively charged NVs, and to subsequently probe the corresponding redistribution of charge. We uncover the formation of spatial patterns of trapped charge, which we qualitatively reproduce via a model of the interplay between photo-excited carriers and atomic defects. Further, by using the NV as a probe, we map the relative fraction of positively charged nitrogen upon localized optical excitation. These observations may prove important to transporting quantum information between NVs or to developing three-dimensional, charge-based memories.
SoK: Context and risk aware access control for zero trust systems
Creators: name: Xiao, Shiyu
name: Ye, Yuhang
name: Kanwal, Nadia
name: NEWE, THOMAS
name: Lee, Brian
Publisher: name: University of Limerick
Year: 2023
Subjects: Engineering

description: Evolving computing technologies such as cloud, edge computing, and the Internet of )ings (IoT) are creating a more complex, dispersed, and dynamic enterprise operational environment. New security enterprise architectures such as those based on the concept of Zero Trust (ZT) are emerging to meet the challenges posed by these changes. ZT systems treat internal and external networks as untrusted and subject both to the same security checking and control to prevent data breaches and limit internal lateral movement. Context awareness is a notion from the field of ubiquitous computing that is used to capture and react to the situation of an entity, based on the dynamics of a particular application or system context. )e idea has been incorporated into several access control models. However, the overlap between context-aware access control and zero-trust security has not been fully explored. In this SoK, we conduct a systematic examination of ZT, context awareness, and risk-based access control to explore the critical elements of each and to identify areas of overlap and synergy to enhance the operation and deployment of ZT systems.
Updated Planetary Mass Constraints of the Young V1298 Tau System Using MAROON-X
Creators: name: Sikora, James
name: Rowe, Jason
name: Barat, Saugata
name: Bean, Jacob L.
name: Brady, Madison
name: Désert, Jean-Michel
name: Feinstein, Adina D.
name: Gilbert, Emily A.
name: Henry, Gregory
name: Kasper, David
name: Lizotte, Déreck-Alexandre
name: Matesic, Michael R. B.
name: Panwar, Vatsal
name: Seifahrt, Andreas
name: Shivkumar, Hinna
name: Stefánsson, Gudmundur
name: Stürmer, Julian
Publisher: name: arXiv
Year: 2023
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The early K-type T-Tauri star, V1298 Tau ($V=10\,{\rm mag}$, ${\rm age}\approx20-30\,{\rm Myr}$) hosts four transiting planets with radii ranging from $4.9-9.6\,R_\oplus$. The three inner planets have orbital periods of $\approx8-24\,{\rm d}$ while the outer planet's period is poorly constrained by single transits observed with \emph{K2} and \emph{TESS}. Planets b, c, and d are proto-sub-Neptunes that may be undergoing significant mass loss. Depending on the stellar activity and planet masses, they are expected to evolve into super-Earths/sub-Neptunes that bound the radius valley. Here we present results of a joint transit and radial velocity (RV) modelling analysis, which includes recently obtained \emph{TESS} photometry and MAROON-X RV measurements. Assuming circular orbits, we obtain a low-significance ($\approx2σ$) RV detection of planet c implying a mass of $19.8_{-8.9}^{+9.3}\,M_\oplus$ and a conservative $2σ$ upper limit of $<39\,M_\oplus$. For planets b and d, we derive $2σ$ upper limits of $M_{\rm b}<159\,M_\oplus$ and $M_{\rm d}<41\,M_\oplus$. For planet e, plausible discrete periods of $P_{\rm e}>55.4\,{\rm d}$ are ruled out at a $3σ$ level while seven solutions with $43.3
description: 18 pages, 13 figures, accepted for publication in AJ
Universal corner entanglement of Dirac fermions and gapless bosons from the continuum to the lattice
Creators: name: Helmes, Johannes
name: Sierens, Lauren E. Hayward
name: Chandran, Anushya
name: Witczak-Krempa, William
name: Melko, Roger G.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: A quantum critical (QC) fluid exhibits universal subleading corrections to the area law of its entanglement entropies. In two dimensions when the partition involves a corner of angle $θ$, the subleading term is logarithmic with coefficient $a_α(θ)$ for the $α$-Rényi entropy. In the smooth limit $θ\!\to\!π$, $a_1(θ)$ yields the central charge of the stress tensor when the QC point is described by a conformal field theory (CFT). For general Rényi indices and angles, $a_α(θ)$ is richer and few general results exist. We study $a_α(θ)$ focusing on two benchmark CFTs, the free Dirac fermion and boson. We perform numerical lattice calculations to obtain high precision results in $θ,α$ regimes hitherto unexplored. We derive field theory estimates for $a_α(θ)$, including new exact results, and demonstrate an excellent quantitative match with our numerical calculations. We also develop and test strong lower bounds, which apply to both free and interacting QC systems. Finally, we comment on the near collapse of $a_α(θ)$ for various theories, including interacting $O(N)$ models.
description: 13+3 pages, 11+1 figures, 2+2 tables
Modeling the large-scale redshift-space 3-point correlation function of galaxies
Creators: name: Slepian, Zachary
name: Eisenstein, Daniel J.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present a configuration-space model of the large-scale galaxy 3-point correlation function (3PCF) based on leading-order perturbation theory and including redshift space distortions (RSD). This model should be useful in extracting distance-scale information from the 3PCF via the Baryon Acoustic Oscillation (BAO) method. We include the first redshift-space treatment of biasing by the baryon-dark matter relative velocity. Overall, on large scales the effect of RSD is primarily a renormalization of the 3PCF that is roughly independent of both physical scale and triangle opening angle; for our adopted $Ω_{\rm m}$ and bias values, the rescaling is a factor of $\sim 1.8$. We also present an efficient scheme for computing 3PCF predictions from our model, important for allowing fast exploration of the space of cosmological parameters in future analyses.
description: 23 pages, 11 figures, submitted MNRAS
The Contribution of Coronal Jets To The Solar Wind
Creators: name: Lionello, R.
name: TÖrÖk, T.
name: Titov, V. S.
name: Leake, J. E.
name: MikiĆ, Z.
name: Linker, J. A.
name: Linton, M. G.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Transient collimated plasma eruptions in the solar corona, commonly known as coronal (or X-ray) jets, are among the most interesting manifestations of solar activity. It has been suggested that these events contribute to the mass and energy content of the corona and solar wind, but the extent of these contributions remains uncertain. We have recently modeled the formation and evolution of coronal jets using a three-dimensional (3D) magnetohydrodynamic (MHD) code with thermodynamics in a large spherical domain that includes the solar wind. Our model is coupled to 3D MHD flux-emergence simulations, i.e, we use boundary conditions provided by such simulations to drive a time-dependent coronal evolution. The model includes parametric coronal heating, radiative losses, and thermal conduction, which enables us to simulate the dynamics and plasma properties of coronal jets in a more realistic manner than done so far. Here we employ these simulations to calculate the amount of mass and energy transported by coronal jets into the outer corona and inner heliosphere. Based on observed jet-occurrence rates, we then estimate the total contribution of coronal jets to the mass and energy content of the solar wind to (0.4-3.0) % and (0.3-1.0) %, respectively. Our results are largely consistent with the few previous rough estimates obtained from observations, supporting the conjecture that coronal jets provide only a small amount of mass and energy to the solar wind. We emphasize, however, that more advanced observations and simulations are needed to substantiate this conjecture.