cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The OGLE Collection of Variable Stars. One Thousand Heartbeat Stars in the Galactic Bulge and Magellanic Clouds
Creators: name: Wrona, Marcin
name: Ratajczak, Milena
name: Kołaczek-Szymański, Piotr A.
name: Kozłowski, Szymon
name: Soszyński, Igor
name: Iwanek, Patryk
name: Udalski, Andrzej
name: Szymański, Michał K.
name: Pietrukowicz, Paweł
name: Skowron, Dorota M.
name: Skowron, Jan
name: Mróz, Przemysław
name: Poleski, Radosław
name: Gromadzki, Mariusz
name: Ulaczyk, Krzysztof
name: Rybicki, Krzysztof
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present a collection of 991 heartbeat star (HBS) candidates found in the Optical Gravitational Lensing Experiment (OGLE) project data archive. We discuss the selection process of the HBS candidates and the structure of the catalog itself. It consists of 512 stars located toward the Galactic bulge (GB), 439 stars located in the Large Magellanic Cloud (LMC), and 40 in the Small Magellanic Cloud (SMC). The collection contains two large groups of HBSs with different physical properties. The main distinction between the two groups is the evolutionary status of the primary star. The first group of about 100 systems contains a hot main-sequence (MS) or a Hertzsprung-gap primary star, while the second group of about 900 systems includes a red giant (RG). For each star, we provide two-decade-long time-series photometry, in the Cousins $I$- and Johnson $V$-band filters, obtained by the OGLE project. We also present basic observational information as well as orbital parameters derived from the light curve modeling.
description: 13 pages (17 pages in arXiv version), 11 figures, 5 tables. The full machine-readable tables are provided by the publisher. The catalog is available via OGLE website: https://astrouw.edu.pl/ogle/ogle4/OCVS/. Erratum; in the publisher version of the paper, there are wrong reference numbers to the figures from Paper II: Figures 8--9 --> Figures 9--10, Figure 10 --> Figure 11, Figure 11 --> Figure 12
The completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Cosmological implications from multi-tracer BAO analysis with galaxies and voids
Creators: name: Zhao, Cheng
name: Variu, Andrei
name: He, Mengfan
name: Sanchez, Daniel Forero
name: Tamone, Amélie
name: Chuang, Chia-Hsun
name: Kitaura, Francisco-Shu
name: Tao, Charling
name: Yu, Jiaxi
name: Kneib, Jean-Paul
name: Percival, Will J.
name: Shan, Huanyuan
name: Zhao, Gong-Bo
name: Burtin, Etienne
name: Dawson, Kyle S.
name: Rossi, Graziano
name: Schneider, Donald P.
name: de la Macorra, Axel
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We construct cosmic void catalogues with the DIVE void finder upon SDSS BOSS DR12 and eBOSS DR16 galaxy samples with BAO reconstruction applied, and perform a joint BAO analysis using different types of galaxies and the corresponding voids. The BAO peak is evident for the galaxy-galaxy, galaxy-void, and void-void correlation functions of all datasets, including the ones cross correlating luminous red galaxy and emission line galaxy samples. Two multi-tracer BAO fitting schemes are then tested, one combining the galaxy and void correlation functions with a weight applied to voids, and the other using a single BAO dilation parameter for all clustering measurements of different tracers. Both methods produce consistent results with mock catalogues, and on average ~10 per cent improvements of the BAO statistical uncertainties are observed for all samples, compared to the results from galaxies alone. By combining the clustering of galaxies and voids, the uncertainties of BAO measurements from the SDSS data are reduced by 5 to 15 per cent, yielding 0.9, 0.8, 1.1, 2.3, and 2.9 per cent constraints on the distance $D_{_{\rm V}}(z)$, at effective redshifts of 0.38, 0.51, 0.70, 0.77, and 0.85, respectively. When combined with BAO measurements from SDSS MGS, QSO, and Ly$α$ samples, as well as the BBN results, we obtain $H_0 = 67.58 \pm 0.91\,{\rm km}\,{\rm s}^{-1}\,{\rm Mpc}^{-1}$, $Ω_{\rm m} = 0.290 \pm 0.015$, and $Ω_Λh^2 = 0.3241 \pm 0.0079$ in the flat-$Λ$CDM framework, where the 1$\,σ$ uncertainties are around 6, 6, and 17 per cent smaller respectively, compared to constraints from the corresponding anisotropic BAO measurements without voids and LRG-ELG cross correlations.
description: 33 pages, 30 figures, published on MNRAS
An optimal multiplier theorem for Grushin operators in the plane, II
Creators: name: Dall'Ara, Gian Maria
name: Martini, Alessio
Publisher: name: arXiv
Year: 2021
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 34L20, 35J70, 35H20, 42B15

description: In a previous work we proved a spectral multiplier theorem of Mihlin--Hörmander type for two-dimensional Grushin operators $-\partial_x^2 - V(x) \partial_y^2$, where $V$ is a doubling single-well potential, yielding the surprising result that the optimal smoothness requirement on the multiplier is independent of $V$. Here we refine this result, by replacing the $L^\infty$ Sobolev condition on the multiplier with a sharper $L^2$ condition. As a consequence, we obtain the sharp range of $L^1$ boundedness for the associated Bochner--Riesz means. The key new ingredient of the proof is a precise pointwise estimate in the transition region for eigenfunctions of one-dimensional Schrödinger operators with doubling single-well potentials.
description: 21 pages. This work refines the multiplier theorem proved in arXiv:2107.12015
Neural Network Based Qubit Environment Characterization
Creators: name: Papič, Miha
name: de Vega, Inés
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The exact microscopic structure of the environments that produces $1/f$ noise in superconducting qubits remains largely unknown, hindering our ability to have robust simulations and harness the noise. In this paper we show how it is possible to infer information about such an environment based on a single measurement of the qubit coherence, circumventing any need for separate spectroscopy experiments. Similarly to other spectroscopic techniques, the qubit is used as a probe which interacts with its environment. The complexity of the relationship between the observed qubit dynamics and the impurities in the environment makes this problem ideal for machine learning methods - more specifically neural networks. With our algorithm we are able to reconstruct the parameters of the most prominent impurities in the environment, as well as differentiate between different environment models, paving the way towards a better understanding of $1/f$ noise in superconducting circuits.
description: 14 + 6 pages, 5 figures, 1 table
Quantitative spectral analysis of electromagnetic scattering. II: Evolution semigroups and non-perturbative solutions
Creators: name: Zhou, Yajun
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mathematical Physics (math-ph)
subject: Numerical Analysis (math.NA)
subject: Optics (physics.optics)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 35Q61, 45E99, 47B38, 47D06, 78A45

description: We carry out quantitative studies on the Green operator $ \hat{\mathscr G}$ associated with the Born equation, an integral equation that models electromagnetic scattering, building the strong stability of the evolution semigroup $\{\exp(-iτ\hat{\mathscr G})|τ\geq0\} $ on polynomial compactness and the Arendt-Batty-Lyubich-Vũ theorem. The strongly-stable evolution semigroup inspires our proposal of a non-perturbative method to solve the light scattering problem and improve the Born approximation.
description: (v1) 22 pages, 3 TikZ figures. Continuation of arXiv:1007.4375v3. Updated from Chapter 5 and Appendix D in https://www.proquest.com/docview/634514288?accountid=13151 (v2) 22 pages, 3 TikZ figures. Accepted version with updated references
Fulfillment of sum rules and Ward identities in the multiloop functional renormalization group solution of the Anderson impurity model
Creators: name: Chalupa-Gantner, Patrick
name: Kugler, Fabian B.
name: Hille, Cornelia
name: von Delft, Jan
name: Andergassen, Sabine
name: Toschi, Alessandro
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We investigate several fundamental characteristics of the multiloop functional renormalization group (mfRG) flow by hands of its application to a prototypical many-electron system: the Anderson impurity model (AIM). We first analyze the convergence of the algorithm in the different parameter regions of the AIM. As no additional approximation is made, the multiloop series for the local self-energy and response functions converge perfectly to the corresponding results of the parquet approximation (PA) in the weak- to intermediate-coupling regime. Small oscillations of the mfRG solution as a function of the loop order gradually increase with the interaction, hindering a full convergence to the PA in the strong-coupling regime, where perturbative resummation schemes are no longer reliable. By exploiting the converged results, we inspect the fulfillment of (i) sum rules associated to the Pauli principle and (ii) Ward identities related to conservation laws. For the Pauli principle, we observe a systematic improvement by increasing the loop order and including the multiloop corrections to the self-energy. This is consistent with the preservation of crossing symmetries and two-particle self-consistency in the PA. For the Ward identities, we numerically confirm a visible improvement by means of the Katanin substitution. At weak coupling, violations of the Ward identity are further reduced by increasing the loop order in mfRG. In this regime, we also determine the precise scaling of the deviations of the Ward identity as a function of the electronic interaction. For larger interaction values, the overall behavior becomes more complex, and the benefits of the higher-loop terms are mostly present in the contributions at large frequencies.
description: 27 pages, 27 figures
Axial inverse magnetic catalysis
Creators: name: Wang, Yuanyuan
name: Matsuzaki, Shinya
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Lattice (hep-lat)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We find that the inverse magnetic catalysis for $U(1)$ axial symmetry (AIMC: axial inverse magnetic catalysis) can emerge around the chiral crossover regime in the thermomagnetic QCD with 2 + 1 flavors at physical point. This phenomenon can be correlated with the IMC for the chiral $SU(2)_L \times SU(2)_R$ symmetry (CIMC: chiral IMC). We explicitly observe the AIMC based on a Nambu-Jona-Lasinio model with 2 + 1 quark flavors, where introduced anomalous magnetic moments of the quarks play the essential role to drive both the CIMC and AIMC. Our finding is shortly testable on lattices. Possible phenomenological and cosmological implications are also briefly addressed.
description: 12 pages, 8 figures
Axion Echos from the Supernova Graveyard
Creators: name: Buen-Abad, Manuel A.
name: Fan, JiJi
name: Sun, Chen
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Stimulated decays of axion dark matter, triggered by a source in the sky, could produce a photon flux along the continuation of the line of sight, pointing backward to the source. The strength of this so-called axion "echo" signal depends on the entire history of the source and could still be strong from sources that are dim today but had a large flux density in the past, such as supernova remnants (SNRs). This echo signal turns out to be most observable in the radio band. We study the sensitivity of radio telescopes such as the Square Kilometer Array (SKA) to echo signals generated by SNRs that have already been observed, and show that SKA could reach axion-photon couplings of order $g_{aγγ} \sim \mathcal{O}(10^{-11}) \,\mathrm{GeV}^{-1}$ for axion masses $m_a \lesssim 10^{-5}\;\mathrm{eV}$. In addition, we show projections of the detection reach for signals coming from old SNRs and from newly born supernovae that could be detected in the future. Intriguingly, an observable echo signal could come from old "ghost" SNRs which were very bright in the past but are now so dim that they haven't been observed.
description: 36 pages, 11 figures, matching the published version
A Simulation-Based Method for Correcting Mode Coupling in CMB Angular Power Spectra
Creators: name: Leung, J. S. -Y.
name: Hartley, J.
name: Nagy, J. M.
name: Netterfield, C. B.
name: Shariff, J. A.
name: Ade, P. A. R.
name: Amiri, M.
name: Benton, S. J.
name: Bergman, A. S.
name: Bihary, R.
name: Bock, J. J.
name: Bond, J. R.
name: Bonetti, J. A.
name: Bryan, S. A.
name: Chiang, H. C.
name: Contaldi, C. R.
name: Doré, O.
name: Duivenvoorden, A. J.
name: Eriksen, H. K.
name: Farhang, M.
name: Filippini, J. P.
name: Fraisse, A. A.
name: Freese, K.
name: Galloway, M.
name: Gambrel, A. E.
name: Gandilo, N. N.
name: Ganga, K.
name: Gualtieri, R.
name: Gudmundsson, J. E.
name: Halpern, M.
name: Hasselfield, M.
name: Hilton, G.
name: Holmes, W.
name: Hristov, V. V.
name: Huang, Z.
name: Irwin, K. D.
name: Jones, W. C.
name: Karakci, A.
name: Kuo, C. L.
name: Kermish, Z. D.
name: Li, S.
name: Mak, D. S. Y.
name: Mason, P. V.
name: Megerian, K.
name: Moncelsi, L.
name: Morford, T. A.
name: Nolta, M.
name: O'Brient, R.
name: Osherson, B.
name: Padilla, I. L.
name: Racine, B.
name: Rahlin, A. S.
name: Reintsema, C.
name: Ruhl, J. E.
name: Runyan, M. C.
name: Ruud, T. M.
name: Shaw, E. C.
name: Shiu, C.
name: Soler, J. D.
name: Song, X.
name: Trangsrud, A.
name: Tucker, C.
name: Tucker, R. S.
name: Turner, A. D.
name: van der List, J. F.
name: Weber, A. C.
name: Wehus, I. K.
name: Wen, S.
name: Wiebe, D. V.
name: Young, E. Y.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Modern CMB analysis pipelines regularly employ complex time-domain filters, beam models, masking, and other techniques during the production of sky maps and their corresponding angular power spectra. However, these processes can generate couplings between multipoles from the same spectrum and from different spectra, in addition to the typical power attenuation. Within the context of pseudo-$C_\ell$ based, MASTER-style analyses, the net effect of the time-domain filtering is commonly approximated by a multiplicative transfer function, $F_{\ell}$, that can fail to capture mode mixing and is dependent on the spectrum of the signal. To address these shortcomings, we have developed a simulation-based spectral correction approach that constructs a two-dimensional transfer matrix, $J_{\ell\ell'}$, which contains information about mode mixing in addition to mode attenuation. We demonstrate the application of this approach on data from the first flight of the SPIDER balloon-borne CMB experiment.
description: 14 pages, 7 figures; updated to match published version
Bouncing cosmology in extended gravity and its reconstruction as dark energy model
Creators: name: Agrawal, A. S.
name: Tello-Ortiz, Francisco
name: Mishra, B.
name: Tripathy, S. K.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper, we have presented a bouncing cosmological model of the Universe in an extended theory of gravity. The dynamical behaviour of the model obtained from the flat FLRW space-time along with the violation of null energy condition have been shown. The geometrical parameters show singularity behaviour at the bouncing epoch. The parameters involved in the scale factor play a major role in the bouncing behaviour. In addition, the coupling parameter that resulted in the minimal matter-geometry coupling in the extended gravity has significant role to avoid the singularity of equation of state parameter at the bouncing epoch. Using a linear homogeneous perturbation calculation, we show the stability of the model.
description: 13 pages, 18 figures, Accepted version, Fortschritte der Physik
Does acceleration assist entanglement harvesting?
Creators: name: Liu, Zhihong
name: Zhang, Jialin
name: Mann, Robert B.
name: Yu, Hongwei
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We explore whether acceleration assists entanglement harvesting for a pair of uniformly accelerated detectors in three different acceleration scenarios, i.e., parallel, anti-parallel and mutually perpendicular acceleration, both in the sense of the entanglement harvested and harvesting-achievable separation between the two detectors. Within the framework of entanglement harvesting protocols and the Unruh-DeWitt model of detectors locally interacting with massless scalar fields via a Gaussian switching function with an interaction duration parameter, we find that, in the sense of the entanglement harvested, acceleration is a mixed blessing insofar as it increases the harvested entanglement for a large detector energy gap relative to the interaction duration parameter, whilst inhibiting the entanglement harvested for a small energy gap. Regarding the harvesting-achievable separation range between the detectors, we further find that for very small acceleration and large energy gap, both relative to the duration parameter, acceleration-assisted enhancement can happen in all three acceleration scenarios. This is in sharp contrast to what was argued previously: that the harvesting-achievable range can be enhanced only for anti-parallel acceleration. However, for a not too small acceleration relative to the duration parameter and an energy gap larger than the acceleration, we find that only detectors in parallel acceleration possess a harvesting-achievable range larger than those at rest.
description: 18 pages, 5 figures
Electrically-pumped high-power laser transmitter integrated on thin-film lithium niobate
Creators: name: Shams-Ansari, Amirhassan
name: Renaud, Dylan
name: Cheng, Rebecca
name: Shao, Linbo
name: He, Lingyan
name: Zhu, Di
name: Yu, Mengjie
name: Grant, Hannah R.
name: Johansson, Leif
name: Zhang, Mian
name: Loncar, Marko
Publisher: name: arXiv
Year: 2021
Subjects: subject: Applied Physics (physics.app-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Integrated thin-film lithium niobate (TFLN) photonics has emerged as a promising platform for realization of high-performance chip-scale optical systems. Of particular importance are TFLN electro-optic modulators featuring high-linearity, low driving voltage and lowpropagation loss. However, fully integrated system requires integration of high power, low noise, and narrow linewidth lasers on TFLN chip. Here we achieve this goal, and demonstrate integrated high-power lasers on TFLN platform with up to 60 mW of optical power in the waveguides. We use this platform to realize a highpower transmitter consisting an electrically-pumped laser integrated with a 50 GHz modulator.
Ammonium-, Phosphonium- and Sulfonium-Based 2-Cyanopyrrolidines for Carbon Dioxide Fixation
Creators: name: Chaban, Vitaly V.
name: Andreeva, Nadezhda A.
name: Voroshylova, Iuliia V.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: The development of carbon dioxide (CO2) scavengers is an acute problem nowadays because of the global warming problem. Many groups around the globe intensively develop new greenhouse gas scavengers. Room-temperature ionic liquids (RTILs) are seen as a proper starting point to synthesize more environmentally friendly and high-performance sorbents. Aprotic heterocyclic anions (AHA) represent excellent agents for carbon capture and storage technologies. In the present work, we investigate RTILs in which both the weakly coordinating cation and AHA bind CO2. The ammonium-, phosphonium- and sulfonium-based 2-cyanopyrrolidines were investigated using the state-of-the-art method to describe the thermochemistry of the CO2 fixation reactions. The infrared spectra, electronic and structural properties were simulated at the hybrid density functional level of theory to characterize the reactants and products of the chemisorption reactions. We conclude that the proposed CO2 capturing mechanism is thermodynamically allowed and discuss the difference between different families of RTILs. Quite unusually, the intramolecular electrostatic attraction plays an essential role in stabilizing the zwitterionic products of the CO2 chemisorption. The difference of chemisorption performance between the families of RTILs is linked to sterical hindrances and nucleophilicities of the α- and \b{eta}-carbon atoms of the aprotic cations. Our results are supported by the previous experimental CO2 sorption measurements and systematically extend their scope.
description: 30 pages
Wall-crossing of TBA equations and WKB periods for the third order ODE
Creators: name: Ito, Katsushi
name: Kondo, Takayasu
name: Shu, Hongfei
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We study the WKB periods for the third order ordinary differential equation (ODE) with polynomial potential, which is obtained by the Nekrasov-Shatashvili limit of ($A_2,A_N$) Argyres-Douglas theory in the Omega background. In the minimal chamber of the moduli space, we derive the Y-system and the thermodynamic Bethe ansatz (TBA) equations by using the ODE/IM correspondence. The exact WKB periods are identified with the Y-functions. Varying the moduli parameters of the potential, the wall-crossing of the TBA equations occurs. We study the process of the wall-crossing from the minimal chamber to the maximal chamber for $(A_2,A_2)$ and $(A_2,A_3)$. When the potential is a monomial type, we show the TBA equations obtained from the ($A_2, A_2$) and ($A_2, A_3$)-type ODE lead to the $D_4$ and $E_6$-type TBA equations respectively.
description: 65+1 pages, 10 figures, typos corrected, published version
title: Ocean deoxygenation: Everyone’s problem
title: Causes, impacts, consequences and solutions : Summary for Policy Makers
titleType: Subtitle
title: Ocean deoxygenation: Everyone’s problem
titleType: AlternativeTitle
Creators: name: Laffoley, Daniel D'A.‏
name: Baxter, John M.
Publisher: name: Union internationale pour la conservation de la nature
Year: 2019

description: Version résumée.
Search for heavy resonances decaying to ZZ or ZW and axion-like particles mediating nonresonant ZZ or ZH production at $\sqrt{s} =$ 13 TeV
Creators: name: CMS Collaboration
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: A search has been performed for heavy resonances decaying to ZZ or ZW and for axion-like particles (ALPs) mediating nonresonant ZZ or ZH production, in final states with two charged leptons ($\ell$ = e, $μ$) produced by the decay of a Z boson, and two quarks produced by the decay of a Z, W, or Higgs boson H. The analysis is sensitive to resonances with masses in the range 450 to 2000 GeV. Two categories are defined corresponding to the merged or resolved reconstruction of the hadronically decaying boson. The search is based on data collected during 2016-2018 by the CMS experiment at the LHC in proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 138 fb$^{-1}$. No significant excess is observed in the data above the standard model background expectation. Upper limits on the production cross section of heavy, narrow spin-2 and spin-1 resonances are derived as functions of the resonance mass, and exclusion limits on the production of bulk graviton particles and W$'$ bosons are calculated in the framework of the warped extra dimensions and heavy vector triplet models, respectively. In addition, upper limits on the ALP-mediated diboson production cross section and ALP couplings to standard model particles are obtained in the framework of linear and chiral effective field theories. These are the first limits on nonresonant ALP-mediated ZZ and ZH production obtained by the LHC experiments.
description: Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/B2G-20-013 (CMS Public Pages)
Practice-based (arts and architecture) research
Creators: name: Evans, Jenny
Publisher: name: Zenodo
Year: 2020
Subjects: ORCID, Practice based research, repository

description: Working with our practice-based arts and architecture communities to build a repository that has prioritised the capture of practice-based research outputs has given the University of Westminster the opportunity to consider how various standards work (or more to the point don’t work) for non-text outputs in these disciplines. This presentation will talk about the nature of these outputs, how they are different, the value of making schema such as ORCID more inclusive and how this might look.
Quasinormal mode analysis of chiral power flow from linearly polarized dipole emitters coupled to index-modulated microring resonators close to an exceptional point
Creators: name: Ren, Juanjuan
name: Franke, Sebastian
name: Hughes, Stephen
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Chiral emission can be achieved from a circularly polarized dipole emitter in a nanophotonic structure that possess special polarization properties such as a polarization singularity, namely with right or left circularly polarization (C-points). Recently, Chen et al. [Nature Physics 16, 571 (2020)] demonstrated the surprising result of chiral radiation from a linearly-polarized (LP) dipole emitter, and argued that this effect is caused by a decoupling with the underlying eigenmodes of a non-Hermitian system, working at an exceptional point (EP). Here we present a quasinormal mode (QNM) approach to model a similar index-modulated ring resonator working near an EP and show the same unusual chiral power flow properties from LP emitters, in direct agreement with the experimental results. We explain these results quantitatively without invoking the interpretation of a missing dimension (the Jordan vector) and a decoupling from the cavity eigenmodes, since the correct eigenmodes are the QNMs which explain the chiral emission using only two cavity modes. By coupling a LP emitter with the dominant two QNMs of the ring resonator, we show how the chiral emission depend on the position and orientation of the emitter, which is also verified by the excellent agreement with respect to the power flow between the QNM theory and full numerical dipole solutions. We also show how a normal mode solution will fail to capture the correct chirality since it does not take into account the essential QNM phase. Moreover, we demonstrate how one can achieve frequency-dependent chiral emission, and replace lossy materials with gain materials in the index modulation to reverse the chirality.
description: 12 pages, 5 figures
Tensor network approach to the two-dimensional fully frustrated XY model and a chiral ordered phase
Creators: name: Song, Feng-Feng
name: Zhang, Guang-Ming
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: A general framework is proposed to solve the two-dimensional fully frustrated XY model for the Josephson junction arrays in a perpendicular magnetic field. The essential idea is to encode the ground-state local rules induced by frustrations in the local tensors of the partition function. The partition function is then expressed in terms of a product of one-dimensional transfer matrix operator, whose eigen-equation can be solved by an algorithm of matrix product states rigorously. The singularity of the entanglement entropy for the one-dimensional quantum analogue provides a stringent criterion to distinguish various phase transitions without identifying any order parameter a prior. Two very close phase transitions are determined at $T_{c1}\approx 0.4459$ and $T_{c2}\approx 0.4532$, respectively. The former corresponding to a Berezinskii-Kosterlitz-Thouless phase transition describing the phase coherence of XY spins, and the latter is an Ising-like continuous phase transition below which a chirality order with spontaneously broken $Z_2$ symmetry is established.
description: 10 pages, 7 figures, revised version
Cosmological model with time varying deceleration parameter in $F(R,G)$ gravity
Creators: name: Lohakare, Santosh V.
name: Tripathy, S. K.
name: Mishra, B.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper, we study the dynamical behaviour of the Universe in the $F(R,G)$ theory of gravity, where $R$ and $G$ respectively denote the Ricci scalar and Gauss-Bonnet invariant. Our wide analysis encompasses the energy conditions, cosmographic parameters, $Om(z)$ diagnostic, stability and the viability of reconstructing the referred model through a scalar field formalism. The model obtained here shows the quintessence like behaviour at late times.
description: 11 pages, 9 figures. Accepted version in Physica Scripta
Evolution of holographic Fermi surface from non-minimal couplings
Creators: name: Wahlang, Wadbor
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study a holographic toy model by considering a probe fermion of finite charge density in an anisotropic background. By computing the fermionic spectral function numerically, we observed that the system exhibits some interesting behaviours in the nature of the Fermi surface (FS) and its evolution when tuning the controlling parameters. We introduced non-minimal interaction terms in the action for holographic fermions along with a complex scalar field but neglecting the backreaction of the fermions field on the background. Suppression in the spectral weight and deformation of FS is observed, which are reminiscent of the results seen in various condensed matter experiments in real materials.
description: 5 pages+references, 4 figures
Alfa de Cronbach Piloto Etapa Cuantitativa de la investigación
Creators: name: Escobar Perdomo, Guillermo
name: Ruíz Cangrejo, Sofía Catalina
Publisher: name: Zenodo
Year: 2025
Subjects: cronbach
coefficient

description: Archivo que presenta el cálculo del coeficiente alfa de Cronbach para la etapa cuantitativa de la investigación.
Paradox of voting : peril of the vetoing to the perpetual peace
Creators: name: Ibrahimov, Vugar
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 2023
Subjects: subject: 340

description: The permanent members of the Security Council of the United Nations possess veto power which was vested to them by the Charter of the United Nations to maintain global peace and security. As many, as well as recent events (Russia’s illegal aggression towards Ukraine in 2022) exhibit, in certain circumstances casting veto power, poses some perils to the global peace, per se, and they are twofold. First, all permanent members can exercise this power, according to their will, to block any resolution of the Security Council, including those that deplore their own illegal and illegit actions. The second challenge is the amendment of the UN Charter. The present wording of the UN Charter makes amending the Charter paradoxically onerous, if not impossible (by giving huge power to the permanent members again). Consequently, this situation has long triggered and urged politicians and legal scholars to explore possible solutions. This article will humbly contemplate the issue and explore the suggestions for the reinvigoration of the existing instruments to resolve the current legal and political quagmire.
Hypothesis Learning in Automated Experiment: Application to Combinatorial Materials Libraries
Creators: name: Ziatdinov, Maxim
name: Liu, Yongtao
name: Morozovska, Anna N.
name: Eliseev, Eugene A.
name: Zhang, Xiaohang
name: Takeuchi, Ichiro
name: Kalinin, Sergei V.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: Machine learning is rapidly becoming an integral part of experimental physical discovery via automated and high-throughput synthesis, and active experiments in scattering and electron/probe microscopy. This, in turn, necessitates the development of active learning methods capable of exploring relevant parameter spaces with the smallest number of steps. Here we introduce an active learning approach based on co-navigation of the hypothesis and experimental spaces. This is realized by combining the structured Gaussian Processes containing probabilistic models of the possible system's behaviors (hypotheses) with reinforcement learning policy refinement (discovery). This approach closely resembles classical human-driven physical discovery, when several alternative hypotheses realized via models with adjustable parameters are tested during an experiment. We demonstrate this approach for exploring concentration-induced phase transitions in combinatorial libraries of Sm-doped BiFeO3 using Piezoresponse Force Microscopy, but it is straightforward to extend it to higher-dimensional parameter spaces and more complex physical problems once the experimental workflow and hypothesis-generation are available.
description: Fixed typo in Eq. 1. Expanded the introduction part. The code reproducing Algorithm 1 is available at https://github.com/ziatdinovmax/hypoAL
Traversable wormhole models in $f(R)$ gravity
Creators: name: Mishra, B.
name: Agrawal, A. S.
name: Tripathy, S. K.
name: Ray, S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this work, we analyze the wormhole solutions in $f(R)$ gravity. Specifically we sought for wormhole geometry solutions for the following three shape functions: (i) $b(r)=r_{0}+ρ_{0}r_{0}^{3}\ln\left(\frac{r_{0}}{r}\right)$, (ii) $b(r)=r_{0}+γr_{0}\left(1-\dfrac{r_{0}}{r}\right)$, and (iii) $b(r)=α+βr$, under some legitimate physical conditions on the parameters as well as constants involved here with in the shape functions. It is observed from the graphical plots that the behaviour of the physical parameters are interesting and viable.
description: 13 pages, 18 figures, Accepted version in IJMPA
Rezension zu: Durdane Zeybek (2021): Die Bedeutung der Sprache für Kinder mit Migrationshintergrund. Darstellung von Wissensbeständen zum Thema Erste Hilfe im sachunterrichtlichen Kontext. Kassel.
Creators: name: Menger, Julia
Publisher: name: widerstreit sachunterricht
Year: 2024
Subjects: subject: 000

description: Rezension zu: Durdane Zeybek (2021): Die Bedeutung der Sprache für Kinder mit Migrationshintergrund. Darstellung von Wissensbeständen zum Thema Erste Hilfe im sachunterrichtlichen Kontext. Kassel.
Universal and Non-Universal Correction Terms of Bose Gases in Dilute Region: a Quantum Monte Carlo Study
Creators: name: Masaki-Kato, Akiko
name: Motoyama, Yuichi
name: Kawashima, Naoki
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We study dilute gases of interacting bosons at zero-temperature in the region where the system is characterized only by the s-wave scattering length. We carry out quantum Monte Carlo simulation of the Bose Hubbard model and a continuous-space hard-core model. Fitting the extended Lee-Huang-Yang formula to the Monte Carlo results establishes the detailed mapping from the lattice model to the continuous field theory characterized only by the s-wave scattering length. Our estimate of the intrinsic s-wave scattering length $a_s$ of the Bose-Hubbard model is $a_s/a_l = 0.316(2)$ where $a_l$ is the lattice constant. It turned out that inclusion of the universal second correction term of $O(n \log n)$ makes the fitting worse while it is restored by inclusion of the non-universal third correction term, of which the existence was predicted analytically.
Cantharidin increases the force of contraction and protein phosphorylation in isolated human atria
Creators: name: Schwarz, R.
name: Hofmann, B.
name: Gergs, Ulrich
name: Neumann, J.
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 2023
Subjects: subject: 610

description: Cantharidin, an inhibitor of protein phosphatase 1 (PP1) and protein phosphatase 2A (PP2A), is known to increase the force of contraction and shorten the time to relaxation in human ventricular preparations. We hypothesized that cantharidin has similar positive inotropic effects in human right atrial appendage (RAA) preparations. RAA were obtained during bypass surgery performed on human patients. These trabeculae were mounted in organ baths and electrically stimulated at 1 Hz. For comparison, we studied isolated electrically stimulated left atrial (LA) preparations and isolated spontaneously beating right atrial (RA) preparations from wild-type mice. Cumulatively applied (starting at 10 to 30 µM), cantharidin exerted a positive concentration-dependent inotropic effect that plateaued at 300 µM in the RAA, LA, and RA preparations. This positive inotropic effect was accompanied by a shortening of the time to relaxation in human atrial preparations (HAPs). Notably, cantharidin did not alter the beating rate in the RA preparations. Furthermore, cantharidin (100 µM) increased the phosphorylation state of phospholamban and the inhibitory subunit of troponin I in RAA preparations, which may account for the faster relaxation observed. The generated data indicate that PP1 and/or PP2A play a functional role in human atrial contractility.
Periodically driven many-body quantum battery
Creators: name: Mondal, Saikat
name: Bhattacharjee, Sourav
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We explore the charging of a quantum battery based on spin systems through periodic modulation of a transverse-field like Ising Hamiltonian. In the integrable limit, we find that resonance tunneling can lead to a higher transfer of energy to the battery and better stability of the stored energy at specific drive frequencies. When the integrability is broken in the presence of an additional longitudinal field, we find that the effective Floquet Hamiltonian contains terms which may lead to a global charging of the battery. However, we do not find any quantum advantage in the charging power, thus demonstrating that global charging is only a necessary and not sufficient condition for achieving quantum advantage.
description: 9 pages, 3 figures, published version
Geometric mean of bipartite concurrences as a genuine multipartite entanglement measure
Creators: name: Li, Yinfei
name: Shang, Jiangwei
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this work we propose the geometric mean of bipartite concurrences as a genuine multipartite entanglement measure. This measure achieves the maximum value for absolutely maximally entangled states and has desirable properties for quantifying potential quantum resources. The simplicity and symmetry in the definition facilitates its computation for various multipartite entangled states including the GHZ states and the $W$ states. With explicit examples we show that our measure results in distinct entanglement orderings from other measures, and can detect differences in certain types of genuine multipartite entanglement while other measures cannot. These results justify the practical application of our measure for tasks involving genuine multipartite entanglement.
description: 8 pages, 4 figures; Comments are welcome!
Disentangling the Regge cut and Regge pole in perturbative QCD
Creators: name: Falcioni, Giulio
name: Gardi, Einan
name: Maher, Niamh
name: Milloy, Calum
name: Vernazza, Leonardo
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The high-energy limit of gauge-theory amplitudes features both a Regge pole and Regge cuts. We show how to disentangle these, and hence how to determine the Regge trajectory beyond two loops. While the nonplanar part of multiple Reggeon $t$-channel exchange forms a Regge cut, the planar part contributes to the pole along with the single Reggeon. With this, we find that the infrared singularities of the trajectory are given by the cusp anomalous dimension. By matching to recent QCD results, we determine the quark and gluon impact factors to two loops and the Regge trajectory to three loops.
description: 7 pages, 2 figures; v2: comments regarding the supersymmetric case added, to appear in Phys. Rev. Lett; v3: added ancillary file
FAIRsFAIR support towards achieving CoreTrustSeal certification - roadmapping exercise
Creators: name: Herterich, Patricia
Publisher: name: Zenodo
Year: 2020
Subjects: Trusted Digital Repositories
Certification

description: This exercise is an adaptation of an exercise run at the first FAIRsFAIR workshop to support selected repositories in getting CoreTrustSeal certified. It is part of a variety of resources prepared by FAIRsFAIR to support services and individuals in their FAIR data practices. We scheduled 60 minutes for this exercise at the workshop, it included time to discuss with the workshop facilitators. This material is not endorsed by CoreTrustSeal and will not guarantee certification. The exercise material consists of instructions and two worksheets.
ORCID across institutions
Creators: name: Wallis, Kirsty
Publisher: name: Zenodo
Year: 2020
Subjects: ORCID, Advocacy

description: As we approach the 5th anniversary of the JISC consortium, this talk maps the journey of ORCID at 3 distinctly different universities and discusses what works, what doesn’t, and what has been learned over time in the world of advocacy.
Self-absorption in [CII], $^{12}$CO, and HI in RCW120. Building up a geometrical and physical model of the region
Creators: name: Kabanovic, S.
name: Schneider, N.
name: Ossenkopf-Okada, V.
name: Falasca, F.
name: Güsten, R.
name: Stutzki, J.
name: Simon, R.
name: Buchbender, C.
name: Anderson, L.
name: Bonne, L.
name: Guevara, C.
name: Higgins, R.
name: Koribalski, B.
name: Luisi, M.
name: Mertens, M.
name: Okada, Y.
name: Röllig, M.
name: Seifried, D.
name: Tiwari, M.
name: Wyrowski, F.
name: Zavagno, A.
name: Tielens, A. G. G. M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Revealing the 3D dynamics of HII regions and their associated molecular clouds is important for understanding the longstanding problem as to how stellar feedback affects the density structure and kinematics of the interstellar medium. We employed observations of the HII region RCW 120 in [CII], observed within the SOFIA legacy program FEEDBACK, and the $^{12}$CO and $^{13}$CO (3$\to$2) lines, obtained with APEX. In addition we used HI data from the Southern Galactic Plane Survey. Two radiative transfer models were used to fit the observed data. A line profile analysis with the 1D non-LTE radiative transfer code SimLine proves that the CO emission cannot stem from a spherically symmetric molecular cloud configuration. With a two-layer multicomponent model, we then quantified the amount of warm background and cold foreground gas. There is a deficit of CO emission along the line-of-sight toward the center of the HII region which indicates that the HII region is associated with a flattened molecular cloud. Self-absorption in the CO line may hide signatures of infalling and expanding molecular gas. The [CII] emission arises from an expanding [CII] bubble and from the PDRs. A significant part of [CII] emission is absorbed in a cool (~60-100 K), low-density (<500 cm$^{-3}$) atomic foreground layer with a thickness of a few parsec. We propose that the RCW 120 HII region formed in a flattened molecular cloud and is now bursting out of its parental cloud. The compressed surrounding molecular layer formed a torus around the spherically expanding HII bubble. This scenario can possibly be generalized for other HII bubbles and would explain the observed "flat" structure of molecular clouds associated with HII bubbles. We suggest that the [CII] absorption observed in many star-forming regions is at least partly caused by low-density, cool, HI-envelopes surrounding the molecular clouds.
Evaluating Transition Planning by Tennessee Farmers
Creators: name: Hughes, David W.
name: Holland, Robert
name: Mehlhorn, Joey E.
name: Delmond, Anthony
name: Hughes, David W.
name: Holland, Robert
name: Mehlhorn, Joey E.
name: Delmond, Anthony
Publisher: name: Unknown
Year: 2019
Subjects: subject: Farm Management
subject: Evaluating
subject: Transition
subject: Planning
subject: Tennessee
subject: Farmers
subject: Financial
subject: Tool

description: Farm transition planning is one of the most underutilized farm financial planning tools and is also one of the most under-researched issues in agriculture (Fetsch 1999). We evaluate the results of a survey administered to 100 farmers attending the 2017 Annual Meeting of the Tennessee Farm Bureau. After briefly reviewing previous research in farm transition planning, we describe our survey approach, analyze our survey results and discuss the implications and conclusions of our study. The primary audience is Extension personnel, agricultural policy makers and leadership of appropriate nonprofit organizations such as the Tennessee Farm Bureau. Our hope is that possible providers of information regarding farm transition planning will be better informed and as a result, more farm transition planning will actually occur.
Shamanism in Indo-European Mythologies
Creators: name: Fournet, Arnaud
Publisher: name: Archaeoastronomy and Ancient Technologies
Year: 2020
Subjects: Shamanism
Comparative Mythology
Germanic
Greek
Caucasic

description: The paper analyzes shamanic cosmology. It is un-Indo-European in its principles and rather typical of Siberian people. The first part describes the ecstatic trances and the cosmological World Tree or Axis mundi, the combination of which is typical of true shamanism. The second part shows that some key features of shamanism can be found outside Siberia, among Caucasic, Greek and North Germanic people. It is shown that Prometheus and Odin have clear shamanistic features.