cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Feynman Rules for the Standard Model Effective Field Theory in $R_ξ$-gauges
Creators: name: Dedes, A.
name: Materkowska, W.
name: Paraskevas, M.
name: Rosiek, J.
name: Suxho, K.
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We assume that New Physics effects are parametrized within the Standard Model Effective Field Theory (SMEFT) written in a complete basis of gauge invariant operators up to dimension 6, commonly referred to as "Warsaw basis". We discuss all steps necessary to obtain a consistent transition to the spontaneously broken theory and several other important aspects, including the BRST-invariance of the SMEFT action for linear $R_ξ$-gauges. The final theory is expressed in a basis characterized by SM-like propagators for all physical and unphysical fields. The effect of the non-renormalizable operators appears explicitly in triple or higher multiplicity vertices. In this mass basis we derive the complete set of Feynman rules, without resorting to any simplifying assumptions such as baryon-, lepton-number or CP conservation. As it turns out, for most SMEFT vertices the expressions are reasonably short, with a noticeable exception of those involving 4, 5 and 6 gluons. We have also supplemented our set of Feynman rules, given in an appendix here, with a publicly available Mathematica code working with the FeynRules package and producing output which can be integrated with other symbolic algebra or numerical codes for automatic SMEFT amplitude calculations.
description: v5: 115 pages; updated to match SmeftFR package version 2, with unitary CKM and PMNS matrices; supersedes version published in JHEP
Bibliographie der Geschichte, Landes- und Volkskunde von Stadt und Kanton Zürich: August 1980-August 1981
Creators: name: Kohler, Ludwig
Publisher: name: Buchdruckerei a/d Sihl AG
Year: 1981
Subjects: subject: 010 Bibliografie
subject: Kanton Zürich
subject: Zürich
subject: Bibliografie
subject: Geschichte
subject: Landeskunde
subject: Volkskunde

description: Separatdruck aus dem Zürcher Taschenbuch auf das Jahr 1982.
Developing a UHS clinical service for investigating early pregnancy loss: Utilising μCT as a less invasive alternative to conventional autopsy
Creators: name: Katsamenis, Orestis L.
name: Goggin, Patricia
name: Michopoulou, Sofia
name: Duffin, Nadine
name: Simcock, Ian C.
name: Hutchinson, J. Ciaran
name: Arthurs, Owen J.
name: Linden J. Stocker
Publisher: name: Zenodo
Year: 2023

description: Poster presentation - Of the 731,000 babies born in the UK in 2018, there were around 250,000 miscarriages, 2,958 stillbirths, and 2,131 neonatal deaths. Perinatal autopsy is a standard method of investigating foetal death, but it can be traumatic for bereaved parents and take months to produce a report. Human foetal imaging-based post-mortem autopsy (fPMA) using X-ray micro-computed tomography (μCT) was developed at the Great Ormond Street Hospital and offers a minimally invasive alternative to conventional autopsy. UoS, UHS, and GOSH collaborate to introduce the service at UHS and offer it to the local community.
description: μCT was performed at the XRH facility at the University of Southampton using a custom designed μCT scanner optimised for 3D X-ray Histology, using GOSH preparation and imaging protocols; Two foetuses were provided by UoS Centre for Learning Anatomical Sciences (ERGO Ethics ID 77968) visit: www.XrayHistology.org • contact info@xrayhistology.org
One-dimensional Quantum Spin Dynamics of Bethe String States
Creators: name: Yang, Wang
name: Wu, Jianda
name: Xu, Shenglong
name: Wang, Zhe
name: Wu, Congjun
Publisher: name: arXiv
Year: 2017
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum dynamics of strongly correlated systems is a challenging problem. Although the low energy fractional excitations of one dimensional integrable models are often well-understood, exploring quantum dynamics in these systems remains challenging in the gapless regime, especially at intermediate and high energies. Based on the algebraic Bethe ansatz formalism, we study spin dynamics in a representative one dimensional strongly correlated model, {\it i.e. }, the antiferromagnetic spin-$\frac{1}{2}$ XXZ chain with the Ising anisotropy, via the form-factor formulae. Various excitations at different energy scales are identified crucial to the dynamic spin structure factors under the guidance of sum rules. At small magnetic polarizations, gapless excitations dominate the low energy spin dynamics arising from the magnetic-field-induced incommensurability. In contrast, spin dynamics at intermediate and high energies is characterized by the two- and three-string states, which are multi-particle excitations based on the commensurate Néel ordered background. Our work is helpful for experimental studies on spin dynamics in both condensed matter and cold atom systems beyond the low energy effective Luttinger liquid theory. Based on an intuitive physical picture, we speculate that the dynamic feature at high energies due to the multi-particle anti-bound state excitations can be generalized to non-integrable spin systems.
description: 15 pages, to appear in Phys. Rev. B
Hiring Expert Consultants in E-Healthcare: A Two Sided Matching Approach
Creators: name: Singh, Vikash Kumar
name: Mukhopadhyay, Sajal
name: Sharma, Aniruddh
name: Roy, Arpan
Publisher: name: arXiv
Year: 2017
Subjects: subject: Computer Science and Game Theory (cs.GT)
subject: FOS: Computer and information sciences

description: Very often in some censorious healthcare scenario, there may be a need to have some expert consultancies (especially by doctors) that are not available in-house to the hospital. With the advancement in technologies (such as video conferencing, smartphone, etc.), it has become reality that, for the critical medical cases in the hospitals, expert consultants (ECs) from around the world could be hired, who will serve the patients by their physical or virtual presence. Earlier, this interesting healthcare scenario of hiring the ECs (mainly doctors) from outside of the hospitals had been studied with the robust concepts of mechanism design with or without money. We have tried to model the ECs (mainly doctors) hiring problem as a two-sided matching problem. In this paper, for the first time, to the best of our knowledge, we explore the more realistic two-sided matching in our set-up, where the members of the two participating communities, namely patients and doctors are revealing the strict preference ordering over all the members of the opposite community for a stipulated amount of time. We assume that patients and doctors are strategic in nature. With the theoretical analysis, we demonstrate that the proposed mechanism that results in a stable allocation of doctors to patients is strategy-proof (or truthful) and optimal. The proposed mechanism is also validated with exhaustive experiments.
description: 33 pages, 9 figures
Finding Better Active Learners for Faster Literature Reviews
Creators: name: Yu, Zhe
name: Kraft, Nicholas A.
name: Menzies, Tim
Publisher: name: arXiv
Year: 2016
Subjects: subject: Software Engineering (cs.SE)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences
subject: D.2.0; I.2.7
subject: 68N01, 68T50

description: Literature reviews can be time-consuming and tedious to complete. By cataloging and refactoring three state-of-the-art active learning techniques from evidence-based medicine and legal electronic discovery, this paper finds and implements FASTREAD, a faster technique for studying a large corpus of documents. This paper assesses FASTREAD using datasets generated from existing SE literature reviews (Hall, Wahono, Radjenović, Kitchenham et al.). Compared to manual methods, FASTREAD lets researchers find 95% relevant studies after reviewing an order of magnitude fewer papers. Compared to other state-of-the-art automatic methods, FASTREAD reviews 20-50% fewer studies while finding same number of relevant primary studies in a systematic literature review.
description: 23 pages, 5 figures, 3 tables, accepted for publication in EMSE journal
Computability Theory, Nonstandard Analysis, and their connections
Creators: name: Normann, Dag
name: Sanders, Sam
Publisher: name: arXiv
Year: 2017
Subjects: subject: Logic (math.LO)
subject: FOS: Mathematics
subject: 03B30, 03D65, 03H99

description: We investigate the connections between computability theory and Nonstandard Analysis. In particular, we investigate the two following topics and show that they are intimately related. (T.1) A basic property of Cantor space $2^{\mathbb{N}}$ is Heine-Borel compactness: For any open cover of $2^{\mathbb{N}}$, there is a finite sub-cover. A natural question is: How hard is it to compute such a finite sub-cover? We make this precise by analyzing the complexity of functionals that given any $g:2^{\mathbb{N}}\rightarrow \mathbb{N}$, output a finite sequence $\langle f_0 , \dots, f_n\rangle $ in $2^{\mathbb{N}}$ such that the neighbourhoods defined from $\bar{f_i}g(f_i)$ for $i\leq n$ form a cover of Cantor space. (T.2) A basic property of Cantor space in Nonstandard Analysis is Abraham Robinson's nonstandard compactness, i.e. that every binary sequence is `infinitely close' to a standard binary sequence. We analyze the strength of this nonstandard compactness property of Cantor space, compared to the other axioms of Nonstandard Analysis and usual mathematics. The study of (T.1) gives rise to exotic objects in computability theory, while (T.2) leads to surprising results in Reverse Mathematics. We stress that (T.1) and (T.2) are highly intertwined and that our study of these topics is `holistic' in nature: results in computability theory give rise to results in Nonstandard Analysis and vice versa.
description: 43 pages, 1 figure, to appear in Journal of Symbolic Logic
Symmetries of flat manifolds, Jordan property and the general Zimmer program
Creators: name: Ye, Shengkui
Publisher: name: arXiv
Year: 2017
Subjects: subject: Geometric Topology (math.GT)
subject: Algebraic Topology (math.AT)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics

description: We obtain a sufficient and necessary condition for a finite group to act effectively on a closed flat manifold. Let \ $G=E_{n}(R)$, $EU_{n}(R,Λ),$ $\mathrm{SAut}(F_{n})$ or $\mathrm{SOut}(F_{n}).$ As applications, we prove that when $n\geq 3$ every group action of $G$ on a closed flat manifold $M^{k}$ ($k
description: Some English words are improved. No math changes, accepted by the Journal of the London Mathematical Society
Search for a heavy resonance decaying to a top quark and a vector-like top quark at sqrt(s) = 13 TeV
Creators: name: CMS Collaboration
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: A search is presented for massive spin-1 Z' resonances decaying to a top quark and a heavy vector-like top quark partner T. The search is based on a 2.6 inverse femtobarns sample of proton-proton collisions at 13 TeV collected with the CMS detector at the LHC. The analysis is optimized for final states in which the T quark decays to a W boson and a bottom quark. The focus is on all-jet final states in which both the W boson and the top quark decay into quarks that evolve into jets. The decay products of the top quark and of the W boson are assumed to be highly Lorentz-boosted and cannot be reconstructed as separate jets, but are instead reconstructed as merged, wide jets. Techniques for the identification of jet substructure and jet flavour are used to distinguish signal from background events. Several models for Z' bosons decaying to T quarks are excluded at 95% confidence level, with upper limits on the cross section ranging from 0.13 to 10 pb, depending on the chosen hypotheses. This is the first search for a neutral spin-1 heavy resonance decaying to a top quark and a vector-like T quark in the all-hadronic final state.
description: Replaced with the published version. Added the journal reference and DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/B2G-16-013 (CMS Public Pages)
Comparing Spatial Distributions of Supernovae Classes in Spiral Galaxies
Creators: name: van Asperen, Joost
Publisher: name: Zenodo
Year: 2024
Subjects: star formation
core collapse
transient host exchange
supernovae
redshift
Astro 98

description: This study explores the spatial distribution of different supernova (SN) classes within spiral galaxies. Spiral arms, rich in localized star formation and generally young stellar populations, serve as valuable age indicators. My primary goal is to compare the distributions of Core Collapse (CC) and type Ia SNe (Ia) relative to spiral arms, aiming to gain insights into the distinctions among their progenitors. Leveraging the extensive and recently published Transient Host Exchange (THEx) database (Qin et al., 2022), that established critical associations between supernova events and their respective hosts. To ensure consistent tracing of spiral arms across various cosmological distances, host galaxies were filtered based on redshift and ellipticity, enhancing the visibility of spiral arm structures. Images were rescaled based on redshift to enable a uniform spatial resolution across all galaxies. The SPiral ARC Finder and Reporter (SpArcFiRe) (Davis & Hayes, 2014) software ensured spiral arm identification. SpArcFiRe is a fully automated software employing pixel-based clustering to locate and characterize spiral arms in images of spiral galaxies, enabling the extraction of detailed structural information. Notably, my findings indicate a differential spatial distribution of SNe within spiral galaxies, particularly when normalized by the radius of the host galaxy. CC events are also more than twice as likely to be situated within spiral arm regions than Ia SNe. This observation suggests that Ia progenitors have had more time to migrate from their formation regions compared to the massive, short-lived CC progenitors. Subsequent studies could explore SN distributions within spiral arms and their proximity to the leading edge, where star formation is believed to take place, providing deeper insights into the characteristics of their progenitors.
description: Astro 98
ICS for Multivariate Outlier Detection with Application to Quality Control
Creators: name: Archimbaud, Aurore
name: Nordhausen, Klaus
name: Ruiz-Gazen, Anne
Publisher: name: arXiv
Year: 2016
Subjects: subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences

description: In high reliability standards fields such as automotive, avionics or aerospace, the detection of anomalies is crucial. An efficient methodology for automatically detecting multivariate outliers is introduced. It takes advantage of the remarkable properties of the Invariant Coordinate Selection (ICS) method. Based on the simultaneous spectral decomposition of two scatter matrices, ICS leads to an affine invariant coordinate system in which the Euclidian distance corresponds to a Mahalanobis Distance (MD) in the original coordinates. The limitations of MD are highlighted using theoretical arguments in a context where the dimension of the data is large. Unlike MD, ICS makes it possible to select relevant components which removes the limitations. Owing to the resulting dimension reduction, the method is expected to improve the power of outlier detection rules such as MD-based criteria. It also greatly simplifies outliers interpretation. The paper includes practical guidelines for using ICS in the context of a small proportion of outliers which is relevant in high reliability standards fields. The choice of scatter matrices together with the selection of relevant invariant components through parallel analysis and normality tests are addressed. The use of the regular covariance matrix and the so called matrix of fourth moments as the scatter pair is recommended. This choice combines the simplicity of implementation together with the possibility to derive theoretical results. A simulation study confirms the good properties of the proposal and compares it with other scatter pairs. This study also provides a comparison with Principal Component Analysis and MD. The performance of our proposal is also evaluated on several real data sets using a user-friendly R package accompanying the paper.
Attempting Exomoon Detection and Constraining Moon Radii with TESS Data of LHS1140 System
Creators: name: Wilson, Logan
Publisher: name: Zenodo
Year: 2024
Subjects: terrestrial moons
planetary transit events
exomoons
Astro 98

description: Terrestrial moons have yet to be discovered outside of the solar system. Here, we present an analysis of the Transiting Exoplanet Survey Satellite (TESS) data of transits of LHS 1140 b and LHS 1140 c to determine whether these planetary transit events also contain secondary transit events of terrestrial exomoons. To make this determination, we compared the χ2 value of a transit model for a lone-planet transit event to that of a transit model with both a planetary transit and a secondary exomoon transit. For the single transit of LHS 1140 b, we determined the probability of the null-hypothesis to be p = 0.672, indicating that the exomoon transit model does not attain statistical significance over the lone- planet transit model and that we have no evidence for the presence of an exomoon. Based on the noise of the data, we are able to rule out all exomoons greater than 0.51 planet radii (0.88 Earth radii). We conducted an equivalent analysis on six transits of LHS 1140 c, obtaining a minimum probability for the null hypothesis of p = .664, again failing to reveal an exomoon. Just as before, we can constrain the maximum radius of an undetected exomoon, placing this maximum value at 0.66 planet radii (0.85 Earth radii). We also conducted multiple successful injection and recovery tests on simulated data with slightly higher precision than the TESS data, with σ = 0.001 instead of 0.005, for simulated exomoon systems with the same planet-moon radius ratio as that of Earth and its moon, where Rm/R⊕= 0.27. These repeated successes increase our confidence in our null results in our analysis of the LHS 1140 exoplanets, but give hope of successful detection of an exomoon in the future within transit events of other systems.
description: Astro 98
Cup products, lower central series, and holonomy Lie algebras
Creators: name: Suciu, Alexander I.
name: Wang, He
Publisher: name: arXiv
Year: 2017
Subjects: subject: Geometric Topology (math.GT)
subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 20F40, 57M05, 17B70, 20F14, 20J05

description: We generalize basic results relating the associated graded Lie algebra and the holonomy Lie algebra from finitely presented, commutator-relators groups to arbitrary finitely presented groups. In the process, we give an explicit formula for the cup-product in the cohomology of a finite 2-complex, and an algorithm for computing the corresponding holonomy Lie algebra, using a Magnus expansion method. We illustrate our approach with examples drawn from a variety of group-theoretic and topological contexts, such as link groups, one-relator groups, and fundamental groups of orientable Seifert fibered manifolds.
description: 27 pages; accepted for publication in the Journal of Pure and Applied Algebra. arXiv admin note: substantial text overlap with arXiv:1504.08294
High-Fidelity Spin Measurement on the Nitrogen-Vacancy Center
Creators: name: Hanks, Michael
name: Trupke, Michael
name: Schmiedmayer, Jörg
name: Munro, William J.
name: Nemoto, Kae
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Nitrogen-vacancy (NV) centers in diamond are versatile candidates for many quantum information processing tasks, ranging from quantum imaging and sensing through to quantum communication and fault-tolerant quantum computers. Critical to almost every potential application is an efficient mechanism for the high fidelity readout of the state of the electronic and nuclear spins. Typically such readout has been achieved through an optically resonant fluorescence measurement, but the presence of decay through a meta-stable state will limit its efficiency to the order of 99%. While this is good enough for many applications, it is insufficient for large scale quantum networks and fault-tolerant computational tasks. Here we explore an alternative approach based on dipole induced transparency (state-dependent reflection) in an NV center cavity QED system, using the most recent knowledge of the NV center's parameters to determine its feasibility, including the decay channels through the meta-stable subspace and photon ionization. We find that single-shot measurements above fault-tolerant thresholds should be available in the strong coupling regime for a wide range of cavity-center cooperativities, using a majority voting approach utilizing single photon detection. Furthermore, extremely high fidelity measurements are possible using weak optical pulses.
description: 13 pages, 8 figures
Strong Electron-Phonon Interaction and Colossal Magnetoresistance in EuTiO$_3$
Creators: name: Chen, Ruofan
name: Ren, Ji-Chang
name: Rubi, Km
name: Mahendiran, R.
name: Wang, Jian-Sheng
Publisher: name: arXiv
Year: 2017
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: At low temperatures, EuTiO$_3$ system has very large resistivities and exhibits colossal magnetoresistance. Based on a first principle calculation and the dynamical mean-field theory for small polaron we have calculated the transport properties of EuTiO$_3$. It is found that due to electron-phonon interaction the conduction band may form a tiny subband which is close to the Fermi level. The tiny subband is responsible for the large resistivity. Besides, EuTiO$_3$ is a weak antiferromagnetic material and its magnetization would slightly shift the subband via exchange interaction between conduction electrons and magnetic atoms. Since the subband is close to the Fermi level, a slight shift of its position gives colossal magnetoresistance.
description: 6 pages, 5 figures
Looking Beyond Appearances: Synthetic Training Data for Deep CNNs in Re-identification
Creators: name: Barbosa, Igor Barros
name: Cristani, Marco
name: Caputo, Barbara
name: Rognhaugen, Aleksander
name: Theoharis, Theoharis
Publisher: name: arXiv
Year: 2017
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences
subject: I.2.10; I.4.8

description: Re-identification is generally carried out by encoding the appearance of a subject in terms of outfit, suggesting scenarios where people do not change their attire. In this paper we overcome this restriction, by proposing a framework based on a deep convolutional neural network, SOMAnet, that additionally models other discriminative aspects, namely, structural attributes of the human figure (e.g. height, obesity, gender). Our method is unique in many respects. First, SOMAnet is based on the Inception architecture, departing from the usual siamese framework. This spares expensive data preparation (pairing images across cameras) and allows the understanding of what the network learned. Second, and most notably, the training data consists of a synthetic 100K instance dataset, SOMAset, created by photorealistic human body generation software. Synthetic data represents a good compromise between realistic imagery, usually not required in re-identification since surveillance cameras capture low-resolution silhouettes, and complete control of the samples, which is useful in order to customize the data w.r.t. the surveillance scenario at-hand, e.g. ethnicity. SOMAnet, trained on SOMAset and fine-tuned on recent re-identification benchmarks, outperforms all competitors, matching subjects even with different apparel. The combination of synthetic data with Inception architectures opens up new research avenues in re-identification.
description: 14 pages
Tuning Feshbach resonance in cold atomic gases with inter-channel coupling
Creators: name: Deng, Tian-Shu
name: Zhang, Wei
name: Yi, Wei
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We show that the essential properties of a Feshbach resonance in cold atomic gases can be tuned by dressing the atomic states in different scattering channels through inter-channel couplings. Such a scheme can be readily implemented in the orbital Feshbach resonance of alkaline-earth-like atoms by coupling hyperfine states in the clock-state manifolds. Using $^{173}$Yb atoms as an example, we find that both the resonance position and the two-body bound-state energy depend sensitively on the inter-channel coupling strength, which offers control parameters in tuning the inter-atomic interactions. We also demonstrate the dramatic impact of the dressed Feshbach resonance on many-body processes such as the polaron to molecule transition and the BCS-BEC crossover.
description: 6 pages, 4 figures
The Homology of Configuration Spaces of Trees with Loops
Creators: name: Chettih, Safia
name: Lütgehetmann, Daniel
Publisher: name: arXiv
Year: 2016
Subjects: subject: Algebraic Topology (math.AT)
subject: FOS: Mathematics
subject: 55R80, 57M15

description: We show that the homology of ordered configuration spaces of finite trees with loops is torsion free. We introduce configuration spaces with sinks, which allow for taking quotients of the base space. Furthermore, we give a concrete generating set for all homology groups of configuration spaces of trees with loops and the first homology group of configuration spaces of general finite graphs. An important technique in the paper is the identification of the $E^1$-page and differentials of Mayer-Vietoris spectral sequences for configuration spaces.
description: 21 pages, 7 figures. Revised Proposition 2.3, other minor changes
Identifying Nature's Largest Telescopes with the AbacusSummit N-body Simulations
Creators: name: Sonnenberg, Tovi Farber
Publisher: name: Zenodo
Year: 2024
Subjects: gravitational lensing
redshift galaxies
dark matter
galaxy clusters
Astro 98

description: Instances of strong gravitational lensing create unique opportunities to study ultra-high-redshift galaxies and dark matter distributions with greater granularity than otherwise possible. Strong lensing is typically observed during the chance alignment of two galaxy clusters along the line of sight, which are uncommon and unpredictable scenarios. However, a projection along the cosmic web could be commonplace and easily predictable. Furthermore, such projections could produce an even stronger signal with a far greater angular size. In this study, I present predictions for the lines of sight for such projections through an analysis of the AbacusSummit N-body simulations. I analyzed light cone convergence fields at z = 2.45 and searched for clusters of pixels with greater-than-critical convergence. Looking along the line of sight of those clusters, I mapped how the mass of dark matter halos (and mass weighted by the lensing kernel) varies with redshift, which revealed that the origin of the strongest gravitational lenses is typically a limited number of enormous (1014 − 1015 M⊙) halos centered at a particular redshift. Although, a minority can trace their origin to a series of halos spread out across redshift space, which is consistent with a projection along a large-scale structure filament. Finally, I use a sample of luminous red galaxies with photometric redshifts from the Dark Energy Spectroscopic Instrument (DESI) to provide insight into which galaxy clusters may host a filamentary projection.
description: Astro 98
Maximum entropy formalism for the analytic continuation of matrix-valued Green's functions
Creators: name: Kraberger, Gernot J.
name: Triebl, Robert
name: Zingl, Manuel
name: Aichhorn, Markus
Publisher: name: arXiv
Year: 2017
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We present a generalization of the maximum entropy method to the analytic continuation of matrix-valued Green's functions. To treat off-diagonal elements correctly based on Bayesian probability theory, the entropy term has to be extended for spectral functions that are possibly negative in some frequency ranges. In that way, all matrix elements of the Green's function matrix can be analytically continued; we introduce a computationally cheap element-wise method for this purpose. However, this method cannot ensure important constraints on the mathematical properties of the resulting spectral functions, namely positive semidefiniteness and Hermiticity. To improve on this, we present a full matrix formalism, where all matrix elements are treated simultaneously. We show the capabilities of these methods using insulating and metallic dynamical mean-field theory (DMFT) Green's functions as test cases. Finally, we apply the methods to realistic material calculations for LaTiO$_3$, where off-diagonal matrix elements in the Green's function appear due to the distorted crystal structure.
description: 15 pages, 7 figures
Electric field and electric forces in a spontaneously polarized nonpolar isotropic dielectric
Creators: name: Tomchenko, Maksim D.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: Based on the microscopic Maxwell equations, we develop a method of description of the electric field in a spontaneously polarized isotropic nonpolar dielectric. We find the solution for the electric field $\textbf{E}(\textbf{r})$ for several typical examples. Moreover, we generalize Helmholtz's formula for the electric force acting on a volume element of a dielectric with regard for the contribution of the spontaneous polarization.
description: 15 pages, 2 figures; v4: final version
Analysis of the Near-Substellar Brown Dwarf TOI-6285b
Creators: name: Murray, Kenneth
name: Latham, David
name: Bieryla, Allyson
Publisher: name: Zenodo
Year: 2024
Subjects: transiting brown dwarf
star orbits
low-mass stars
star formation
Astro 98

description: Here we present results from TOI-6285b, a transiting brown dwarf (BD) orbiting a young A-type main sequence star. We used a global fit to derive the parameters of the host star, BD, and system as a whole. We found that the BD has a mass of MBD = 87.0+2.2 M and a radius of R = 0.790+0.028 R . The host star has a mass of M = −2.1 J BD −0.022 J ∗ 1.809+0.068 M , a radius of R = 1.899+0.058 R , and an effective surface temperature of −0.067 ⊙ ∗ −0.038 ⊙ T = 7340+200 K. From these parameters and the MIST model we calculate a stellar eff −210 age of 540+180 Myr. We derive an orbital period P = 6.85813 ± 0.00001 days and an −140 BD eccentricity 0.0032+0.0024, suggesting a close orbit that may have been circularized. The −0.0020 BD lies far enough above the substellar transition point to be in an ambiguous position between very massive BDs and ultra low-mass stars, while its radius is extremely low for the age of the system. These characteristics raise interesting questions about the formation mechanism of TOI-6285b and the potential implications on the formation of similar objects in general.
description: Astro 98
Probing molecular gas conditions in the merging system Arp 142 with CO observations
Creators: name: Quayum, Rafid
Publisher: name: Zenodo
Year: 2024
Subjects: star formation
galaxy formation
Astro 98

description: Merging systems create unique environments that enhance star formation in galaxies. The cause of this enhanced star formation can be due to increased molecular gas or star formation efficiency. Arp 142 (D∼100 Mpc) consists of an elliptical (NGC 2937) and spiral (NGC 2936) galaxy pair in the early stages of merging. To investigate the physical conditions in the molecular gas and high star formation rate (SFR), we observed Arp 142 using the Submillimeter Array (SMA) at 230 GHz rest frequency to observe the CO (2-1) line. The CO (2-1) data provides new information about higher rotational energy transitions, and we complement our CO (2-1) observations with archival NOEMA CO (1-0) data to probe the excitation conditions of the gas. We generated integrated intensity and line ratio (R21) maps to investigate the excitation of the CO gas. Throughout the system of Arp 142, we then calculated a mean R value of 0.82+0.18, which falls below the calculated mean R value for a sample 21 −0.16 21 of LIRGs with similar properties (R21lit. = 1.09 ± 0.04). Additionally, using ancillary data from the WISE W3 and GALEX FUV bands, we derived values of the star formation rate surface density of Arp 142 using both IR and UV wavelengths. We then examined the R21 value as a function of SFR surface density and found a positive correlation stronger than the one previously found in a study of starburst galaxies with similar properties. Additionally, we examined the relationship between SFR and gas mass for Arp 142 to determine a Kennicutt-Schmidt relation using the CO (2-1) and (1-0) lines respectively. These findings allow us to better contextualize the star formation activity across Arp 142.
description: Astro 98
Computational insights and the observation of SiC nanograin assembly: towards 2D silicon carbide
Creators: name: Susi, Toma
name: Skakalova, Viera
name: Mittelberger, Andreas
name: Kotrusz, Peter
name: Hulman, Martin
name: Pennycook, Timothy J.
name: Mangler, Clemens
name: Kotakoski, Jani
name: Meyer, Jannik C.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: While an increasing number of two-dimensional (2D) materials, including graphene and silicene, have already been realized, others have only been predicted. An interesting example is the two-dimensional form of silicon carbide (2D-SiC). Here, we present an observation of atomically thin and hexagonally bonded nanosized grains of SiC assembling temporarily in graphene oxide pores during an atomic resolution scanning transmission electron microscopy experiment. Even though these small grains do not fully represent the bulk crystal, simulations indicate that their electronic structure already approaches that of 2D-SiC. This is predicted to be flat, but some doubts have remained regarding the preference of Si for sp$^{3}$ hybridization. Exploring a number of corrugated morphologies, we find completely flat 2D-SiC to have the lowest energy. We further compute its phonon dispersion, with a Raman-active transverse optical mode, and estimate the core level binding energies. Finally, we study the chemical reactivity of 2D-SiC, suggesting it is like silicene unstable against molecular absorption or interlayer linking. Nonetheless, it can form stable van der Waals-bonded bilayers with either graphene or hexagonal boron nitride, promising to further enrich the family of two-dimensional materials once bulk synthesis is achieved.
description: 10 pages, 5 figures, 4 supplementary figures
Precision RPS Calibration for the BICEP3 Telescope
Creators: name: Sjoberg, Kane
Publisher: name: Zenodo
Year: 2024
Subjects: refracting telescopes
cosmic microwave background
Astro 98

description: Here we present the results of characterization and upgrades to the Rotating Polarized Source (RPS) for the BICEP3 Telescope, an advanced refracting telescope designed to measure the polarization of the Cosmic Microwave Background at 95GHz. Characterization of the behavior of the RPS in-lab is critical for developing empirical expectations of achievable angle uncertainty when deployed in the field. Sources of error in the field include wind, adverse weather conditions, and even thermal expansion due to sun exposure of the guy wires that anchor the RPS on its mast at the South Pole. With the installation of a new high-precision encoder system enhancing position measurement accuracy and quantifying mechanical error, we present new results about the quantitative behavior of the Rotating Polarized Source and detail improved characterization and control of the RPS’s behavior, towards the goal of complete repeatability and a decreased error budget from current by two orders of magnitude.
description: Astro 98
First Steps in Refining the Automation of Preliminary Orbital Determination using Asteroids 2023 RD and 2023 UJ7
Creators: name: Stefanoni, Marina
name: Spoto, Federica
Publisher: name: Zenodo
Year: 2024
Subjects: solar system objects
orbital determination
Gauss method
Laplace method
asteroids
Astro 98

description: Determining preliminary orbits is integral in the process of designating new solar system objects (SSOs). This designation process can be improved through automation, and the level of automation efficiency relies on refining the basic parameters governing the submissions of observational data. The preliminary orbital determination methods cited in this paper require the submission of at least three distinct observations in order to have the capability of producing an initial orbit. We found that having greater time between observations helps reduce error in the computed initial orbit. However, the minimum time between the first and last observation allowing a preliminary orbit to be computed has yet to be researched. The Gauss [Gro04] and Laplace [Gro09] methods were used in addition to a higher order polynomial (degree 8) method to investigate how preliminary orbits changed with different time spans between observations. We ran a preliminary orbital determination process on different batches of observations of two asteroids designated 2023 RS and 2023 UJ7. The results of the test batches yielded the key result that both objects could have had preliminary orbits computed with fewer observations than were used in reality. This has valuable implications for planetary defense efforts especially concerning the near-earth asteroid 2023 RS.
description: Astro 98
Erasmus Goes Green Policy recommendations
Creators: name: Alves, Helena
name: Terzieva, Viktoriya
Publisher: name: Erasmus Goes Green
Year: 2022

description: Directed to the three levels of Erasmus+ Programme management - European, national and institutional, the recommendations aim to provide each stakeholder with an action framework to help them transform the Erasmus+ mobility activities into more environmentally friendly ones.

The Erasmus Goes Green (EGG) project aimed to increase environmental awareness on mobility and encourage more sustainable internationalisation strategies in order to reduce the transport-related carbon footprint of mobility activities.
3/2 Fractional Quantum Hall Plateau in Confined Two-Dimensional Electron Gas
Creators: name: Fu, Hailong
name: Wu, Yijia
name: Zhang, Ruoxi
name: Sun, Jian
name: Shan, Pujia
name: Wang, Pengjie
name: Zhu, Zheyi
name: Pfeiffer, L. N.
name: West, K. W.
name: Liu, Haiwen
name: Xie, X. C.
name: Lin, Xi
Publisher: name: arXiv
Year: 2017
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Even-denominator fractional quantum Hall (FQH) states, such as 5/2 and 7/2, have been well known in a two-dimensional electron gas (2DEG) for decades and are still investigated as candidates of non-Abelian statistics. In this paper, we present the observation of a 3/2 FQH plateau in a single-layer 2DEG with lateral confinement at a bulk filling factor of 5/3. The 3/2 FQH plateau is quantized at (h/e^2 )/(3/2) within 0.02%, and can survive up to 300 mK. This even-denominator FQH plateau may imply intriguing edge structure and excitation in FQH system with lateral confinement. The observations in this work demonstrate that understanding the effect of the lateral confinement on the many-body system is critical in the pursuit of important theoretical proposals involving edge physics, such as the demonstration of non-Abelian statistics and the realization of braiding for fault-tolerant quantum computation.
description: 22 pages, 11 figures
Symmetries and scaling in generalised coupled conserved Kardar-Parisi-Zhang equations
Creators: name: Banerjee, Tirthankar
name: Basu, Abhik
Publisher: name: arXiv
Year: 2017
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the noisy nonequilibrium dynamics of a conserved density that is driven by a fluctuating surface governed by the conserved Kardar-Parisi-Zhang equation. We uncover the universal scaling properties of the conserved density. We consider two separate minimal models where the surface fluctuations couple (i) with the spatial variation of the conserved density, and (ii) directly with the magnitude of the conserved density. Both these two models conserve the density, but differ from symmetry stand point. We use our result to highlight the dependence of nonequilibrium universality classes on the interplay between symmetries and conservation laws.
description: accepted in JSTAT. Mech : Theory and Experiments (2017)
MODERNIZATION OF THE DESIGN OF THE COIL SPRING OF THE AXLE SUSPENSION OF HIGH-SPEED ELECTRIC TRAINS
Creators: name: Khromova, Galina
name: Kamalov, Ikram
name: Omonov, Shokhzhakhon
Publisher: name: Zenodo
Year: 2025

description: The article presents a mathematical model and a developed algorithm for numerical studies on the selection of rational parameters of a modernized coil spring for axle box spring suspension of high-speed electric trains, the design of which is protected by patent of the Republic of Uzbekistan for invention No. IAP 05219 [1].
Heavy Neutrino Search via the Higgs boson at the LHC
Creators: name: Das, Arindam
name: Gao, Yu
name: Kamon, Teruki
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: In the inverse see-saw model the effective neutrino Yukawa couplings can be sizable due to a large mixing angle between the light $(ν)$and heavy neutrinos $(N)$. When the right handed neutrino $(N)$ can be lighter than the Standard Model (SM) Higgs boson $(h)$. It can be produced via the on-shell decay of the Higgs, $h\to Nν$ at a significant branching fraction at the LHC. In such a process $N$ mass can be reconstructed in its dominant $N\rightarrow W \ell$ decays. We perform an analysis on this channel and its relevant backgrounds, among which the $W+$jets background is the largest. Considering the existing mixing constraints from the Higgs and electroweak precision data, the best sensitivity of the heavy neutrino search is achieved for benchmark $N$ mass at 100 and 110 GeV for upcoming high luminosity LHC runs.
description: 22 pages, 7 Figures, updated analysis, model part extended, matched journal version in EPJC
Conceptual and action framework on low carbon | high air quality nature-based solutions
Creators: name: Gantioler, Sonja
name: Siclari, Isabella
name: McConaghy, Charlotte
name: Croce, Silvia
name: Zambelli, Pietro
name: Zilio, Samuele
name: Giacovelli, Grazia
name: D'Alonzo, Valentina
name: Balest, Jessica
name: Mavrigiannaki, Angeliki
name: Van Lierop, Martina
name: Gupta, Arushi
name: Chapman, Eleanor
name: Vance, Colin
name: Lim, Yirang
Publisher: name: Zenodo
Year: 2023
Subjects: Nature-based solutions
Environmental and ecological (space) justice
Low carbon cities
High air quality cities
Spatial disparities
Thermal comfort
Temporal justice
Biodiversity
Climate Change

description: As the acronym already indicates, JUSTNature introduces the normative notion of justice. An initial analysis of the scope of nature-based solutions and the role of justice suggests that issues of social and environmental justice are only considered peripherally, and that so far no dedicated research community has addressed the topic. It has been revealed that, although some attention has been directed at questions of social justice (e.g. inclusiveness) and procedural aspects (e.g. co-creation and participative processes), a more comprehensive debate on the role of environmental or climate justice aspects in relation to the activation and implementation of NbS has rarely taken place. This report has the overall objective of determining the scientific knowledge base and developing a framework for assessing NbS potentials to ensure the right to ecological space and the duty of not constraining that of others. It aims to: Provide a conceptual framework,  which guides on ethical notions such as equality, inequality, and equity, and on key concepts such as the various dimensions of justice, why justice, why ecological (space) justice, and how to activate NbS accordingly. Introduce an action framework, which outlines the knowledge base for 6 identified (in-) justices challenges, which frame action on Low carbon | High air quality NbS potentials specifically.
A Comprehensive Physics-Informed Machine Learning Framework for Predictive Turbulence Modeling
Creators: name: Wang, Jian-Xun
name: Wu, Jinlong
name: Ling, Julia
name: Iaccarino, Gianluca
name: Xiao, Heng
Publisher: name: arXiv
Year: 2017
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Although an increased availability of computational resources has enabled high-fidelity simulations of turbulent flows, the RANS models are still the dominant tools for industrial applications. However, the predictive capabilities of RANS models are limited by potential inaccuracy driven by hypotheses in the Reynolds stress closure. Recently, a Physics-Informed Machine Learning (PIML) approach has been proposed to learn the functional form of Reynolds stress discrepancy in RANS simulations based on available data. It has been demonstrated that the learned discrepancy function can be used to improve Reynolds stresses in different flows where data are not available. However, owing to a number of challenges, the improvements have been demonstrated only in the Reynolds stress prediction but not in the corresponding propagated quantities of interest. In this work, we introduce the procedures toward a complete PIML framework for predictive turbulence modeling, including learning Reynolds stress discrepancy function, predicting Reynolds stresses in different flows, and propagating to mean flow fields. The process of Reynolds stress propagation and predictive accuracy of the propagated velocity field are investigated. To improve the learning-prediction performance, the input features are enriched based on an integrity basis of invariants. The fully developed turbulent flow in a square duct is used as the test case. The discrepancy model is trained on flow fields obtained from several Reynolds numbers and evaluated on a duct flow at a Reynolds number higher than any of the training cases. The predicted Reynolds stresses are propagated to velocity field through RANS equations. Numerical results show excellent predictive performances in both Reynolds stresses and their propagated velocities, demonstrating the merits of the PIML approach in predictive turbulence modeling.
description: This manuscript is unpublished. The work presented herein has been significantly improved and published separately as: J.-L. Wu, H. Xiao and E. G. Paterson. Physics-informed machine learning approach for augmenting turbulence models: A comprehensive framework. Physical Review Fluids. 3, 074602, 2018. DOI: 10.1103/PhysRevFluids.3.074602