cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Supplementary material list from Foraging mode constrains the evolution of cephalic horns in lizards and snakes
Creators: name: Banfi, Federico
name: Meiri, Shai
name: Shine, Richard
name: Damme, Raoul Van
name: Baeckens, Simon
Publisher: name: The Royal Society
Year: 2023
Subjects: classificationCode: 310399
subject: Ecology not elsewhere classified
classificationCode: 310499
subject: Evolutionary biology not elsewhere classified

description: 'README' document listing all the submitted supplementary material, with description of each file.
Fluid mode spectroscopy for measuring kinematic viscosity of fluids in open cylindrical containers
Creators: name: Ishida, Hideshi
name: Horie, Masaaki
name: Harada, Takahiro
name: Mizuno, Shingo
name: Hamada, Seita
name: Imura, Haruki
name: Ashiwake, Shoma
name: Isayama, Naoya
name: Saeki, Ryomei
name: Kozono, Ryotaro
name: Taki, Daichi
name: Kurose, Asuka
Publisher: name: arXiv
Year: 2023
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: On a daily basis we stir tee or coffee with a spoon and leave it to rest. We know empirically the larger the stickiness, viscosity, of the fluid, more rapidly its velocity slows down. It is surprising, therefore, that the variation, the decay rate of the velocity, has not been utilized for measuring (kinematic) viscosity of fluids. This study shows that a spectroscopy decomposing a velocity field into fluid modes (Stokes eigenmodes) allows us to measure accurately the kinematic viscosity. The method, Fluid Mode Spectroscopy (FMS), is based on the fact that each Stokes eigenmode has its inherent decay rate of eigenvalue and that the dimensionless rate of the slowest decaying mode (SDM) is constant, dependent only on the normalized shape of a fluid container, obtained analytically for some shapes including cylindrical containers. The FMS supplements major conventional measuring methods with each other, particularly useful for measuring relatively low kinematic viscosity and for a direct measurement of viscosity at zero shear rate without extrapolation. The method is validated by the experiments of water poured into an open cylindrical container, as well as by the corresponding numerical simulations.
description: 21 pagese, 7 figures
Dynamical quantum correlations of Ising models on an arbitrary lattice and their resilience to decoherence
Creators: name: Foss-Feig, Michael
name: Hazzard, Kaden R A
name: Bollinger, John J
name: Rey, Ana Maria
name: Clark, Charles W
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Ising models, and the physical systems described by them, play a central role in generating entangled states for use in quantum metrology and quantum information. In particular, ultracold atomic gases, trapped ion systems, and Rydberg atoms realize long-ranged Ising models, which even in the absence of a transverse field can give rise to highly non-classical dynamics and long-range quantum correlations. In the first part of this paper, we present a detailed theoretical framework for studying the dynamics of such systems driven (at time t=0) into arbitrary unentangled non-equilibrium states, thus greatly extending and unifying the work of Ref. [1]. Specifically, we derive exact expressions for closed-time-path ordered correlation functions, and use these to study experimentally relevant observables, e.g. Bloch vector and spin-squeezing dynamics. In the second part, these correlation functions are then used to derive closed-form expressions for the dynamics of arbitrary spin-spin correlation functions in the presence of both T_1 (spontaneous spin relaxation/excitation) and T_2 (dephasing) type decoherence processes. Even though the decoherence is local, our solution reveals that the competition between Ising dynamics and T_1 decoherence gives rise to an emergent non-local dephasing effect, thereby drastically amplifying the degradation of quantum correlations. In addition to identifying the mechanism of this deleterious effect, our solution points toward a scheme to eliminate it via measurement-based coherent feedback.
description: 34 pages, 11 pages
Dislocation Avalanches: Earthquakes on the Micron Scale
Creators: name: Ispánovity, Péter Dusán
name: Ugi, Dávid
name: Péterffy, Gábor
name: Knapek, Michal
name: Kalácska, Szilvia
name: Tüzes, Dániel
name: Dankházi, Zoltán
name: Máthis, Kristián
name: Chmelík, František
name: Groma, István
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Compression experiments on micron-scale specimens and acoustic emission (AE) measurements on bulk samples revealed that the dislocation motion resembles a stick-slip process - a series of unpredictable local strain bursts with a scale-free size distribution. Here we present a unique experimental set-up, which detects weak AE waves of dislocation slip during the compression of Zn micropillars. Profound correlation is observed between the energies of deformation events and the emitted AE signals that, as we conclude, are induced by the collective dissipative motion of dislocations. The AE data also reveal a surprising two-level structure of plastic events, which otherwise appear as a single stress drop. Hence, our experiments and simulations unravel the missing relationship between the properties of acoustic signals and the corresponding local deformation events. We further show by statistical analyses that despite fundamental differences in deformation mechanism and involved length- and time-scales, dislocation avalanches and earthquakes are essentially alike.
description: Preprint submitted to Nature Communications
The conjugacy stability problem for parabolic subgroups in Artin groups
Creators: name: Cumplido, María
Publisher: name: arXiv
Year: 2021
Subjects: subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 20F36, 20F10

description: Given an Artin group $A$ and a parabolic subgroup $P$, we study if every two elements of $P$ that are conjugate in $A$, are also conjugate in $P$. We provide an algorithm to solve this decision problem if $A$ satisfies three properties that are conjectured to be true for every Artin group. We partially solve the problem if $A$ has $FC$-type, and we totally solve it if $A$ is isomorphic to a free product of spherical Artin groups. In particular, we show that in this latter case, every element of $A$ is contained in a unique minimal (by inclusion) parabolic subgroup.
description: 18 pages, 1 figure. About replacement: Details added, little mistakes corrected, recent application of the main result cited. About second replacement: Some proofs needed more explanation
Classical and Quantum Orbital Correlations in the Molecular Electronic States
Creators: name: Pusuluk, Onur
name: Yesiller, Mahir H.
name: Torun, Gokhan
name: Müstecaplıoğlu, Özgür E.
name: Yurtsever, Ersin
name: Vedral, Vlatko
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: The quantum superposition principle has been extensively utilized in the quantum mechanical description of the bonding phenomenon. It explains the emergence of delocalized molecular orbitals and provides a recipe for the construction of near-exact electronic wavefunctions. On the other hand, its existence in composite systems may give rise to nonclassical correlations that are regarded now as a resource in quantum technologies. Here, we approach the electronic ground states of three prototypical molecules from the point of view of fermionic information theory. For the first time in the literature, we properly decompose the pairwise orbital correlations into their classical and quantum parts in the presence of superselection rules. We observe that quantum orbital correlations can be stronger than classical orbital correlations though not often. Also, quantum orbital correlations can survive even in the absence of orbital entanglement depending on the symmetries of the constituent orbitals. Finally, we demonstrate that orbital entanglement would be underestimated if the orbital density matrices were treated as qubit states.
description: 11 pages, 4 figures
title: Robert Heiner: Studien an Siedlungskeramik. Ausgewählte Merkmale und Fundkomplexe der Latène- und der Römischen Kaiserzeit aus der Siedlung Fritzlar-Geismar, Schwalm-Eder-Kreis
Creators: name: Blaich, Markus C.
Publisher: name: University Library Heidelberg
Year: 2014

description: Rezension zu: Robert Heiner: Studien an Siedlungskeramik. Ausgewählte Merkmale und Fundkomplexe der Latene- und der Römischen Kaiserzeit aus der Siedlung Fritzlar-Geismar, Schwalm-Eder-Kreis. Materialien zur Vor- und Frühgeschichte von Hessen, Bd. 12,1. Selbstverlag des Landesamtes für Denkmalpflege Hessen. Wiesbaden 1994. 118 Seiten, 33 Abbildungen und zahlreiche Tabellen
title: Ursula Werben: Archäologische Untersuchungen an der Bundesstraße 3 bei Einbeck, Ldkr. Northeim. Ein Überblick
Creators: name: Rinne, Christoph
Publisher: name: University Library Heidelberg
Year: 2014

description: Rezension zu: Ursula Werben: Archäologische Untersuchungen an der Bundesstraße 3 bei Einbeck, Ldkr. Northeim. Ein Überblick. Studien zur Einbecker Geschichte Bd. 10. Ihsensee Verlag. Oldenburg 1996. 119 S., 27 Abb., 42 Tafeln.
ISBN 3-89598-392-6
Pole mass renormalon and its ramifications
Creators: name: Beneke, Martin
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: I review the structure of the leading infrared renormalon divergence of the relation between the pole mass and the $\overline{\rm MS}$ mass of a heavy quark, with applications to the top, bottom and charm quark. That the pole quark mass definition must be abandoned in precision computations is a well-known consequence of the rapidly diverging series. The definitions and physics motivations of several leading renormalon-free, short-distance mass definitions suitable for processes involving nearly on-shell heavy quarks are discussed.
description: 23 pages, LaTex, contribution to EPJ ST "Renormalons and Hyperasymptotics in QCD"; v2: missing minus signs in tables 2 and 3 corrected
Theory of carrier density in multigated doped graphene sheets with quantum correction
Creators: name: Liu, Ming-Hao
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The quantum capacitance model is applied to obtain an exact solution for the space-resolved carrier density in a multigated doped graphene sheet at zero temperature, with quantum correction arising from the finite electron capacity of the graphene itself taken into account. The exact solution is demonstrated to be equivalent to the self-consistent Poisson-Dirac iteration method by showing an illustrative example, where multiple gates with irregular shapes and a nonuniform dopant concentration are considered. The solution therefore provides a fast and accurate way to compute spatially varying carrier density, on-site electric potential energy, as well as quantum capacitance for bulk graphene, allowing for any kind of gating geometry with any number of gates and any types of intrinsic doping.
description: 4 pages, 3 figures
Distinguishing signatures of scalar leptoquarks at hadron and muon colliders
Creators: name: Bandyopadhyay, Priyotosh
name: Karan, Anirban
name: Mandal, Rusa
name: Parashar, Snehashis
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: While the hunt for new states beyond the standard model (SM) goes on for various well motivated theories, the leptoquarks are among the most appealing scenarios at recent times due to a series of tensions observed in $B$-meson decays. We consider $SU(2)$ singlet and triplet scalar leptoquarks separately, which contribute to charged and neutral current $B$-meson decays. Focusing on the single production of these two scalar leptoquarks, we perform a PYTHIA-based simulation considering all the dominant SM backgrounds at the current and future setups of the Large Hadron Collider (LHC). The mono-$b$-jet + $\ptmiss$ finalstate gives the strongest signal for the singlet leptoquark at the 30 TeV LHC or Future Circular Collider (FCC), with a possibility of $5σ$ signal significance with $\gtrsim 1000$ \fbi of integrated luminosity, for the chosen benchmark scenarios. The finalstate consisting of a $c$-jet and two $τ$-jets provides highest reach for the singlet leptoquark, probing an $\mathcal{O}(10^{-1})$ value of the Yukawa-type couplings for up to $3.0$ TeV leptoquark mass. For the triplet leptoquark, $1-{\rm jet}+2μ+ \ptmiss$ topology is the most optimistic signature at the LHC, probing leptoquark couplings to fermions at $\mathcal{O}(10^{-1})$ value for the leptoquark mass range up to $ 4.0$ TeV. The invariant mass edge distribution is found to be instrumental in determination of the leptoquark mass scale at the LHC. We also perform the analysis at the proposed multi-TeV muon collider, where an $\mathcal{O}(10^{-1})$ leptoquark Yukawa coupling can be probed for a $5.0$ TeV leptoquark mass.
description: 64 pages, 29 tables, 20 figures, publsihed
Theory of perturbation of electrostatic field by an anisotropic dielectric sphere
Creators: name: Lakhtakia, Akhlesh
name: Tsitsas, Nikolaos L.
name: Alkhoori, Hamad M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: The boundary-value problem for the perturbation of an electric potential by a homogeneous anisotropic dielectric sphere in vacuum was formulated. The total potential in the exterior region was expanded in series of radial polynomials and tesseral harmonics, as is standard for the Laplace equation. A bijective transformation of space was carried out to formulate a series representation of the potential in the interior region. Boundary conditions on the spherical surface were enforced to derive a transition matrix that relates the expansion coefficients of the perturbation potential in the exterior region to those of the source potential. Far from the sphere, the perturbation potential decays as the inverse of the distance squared from the center of the sphere, as confirmed numerically.
“I was just feeding the baby and he ripped her off my breast”: A case study of a Christian woman's lived experience of domestic violence
Creators: name: Lowik, Vicki
Publisher: name: CQUniversity
Year: 2023
Subjects: classificationCode: 440503
subject: Feminist theory
classificationCode: 441009
subject: Sociology of family and relationships
classificationCode: 440504
subject: Gender relations

description: This retrospective longitudinal study promotes the voice of a victim of domestic violence, Jessica. A case study methodology was adopted for this project and Jessica’s lived experience of domestic violence was explored through a feminist framework that promoted her voice and valued her reflections. Jessica’s narrative, produced through a series of lengthy interviews, detailed the development and progression of domestic violence during her 27-year marriage to Jack and in the months following their separation. The findings from the analysis of this narrative were triangulated with the findings from an analysis of a Christian sermon preached to a faith community similar to the communities Jessica attended during her marriage – communities that endorsed the Christian doctrine of male headship. The potential for the principles associated with the doctrine of male headship to oppress women has been explored through existing research. The key finding from this research project identifies this doctrine as an ‘umbrella’ form of coercive control that renders necessary the actioning of other coercive and controlling behaviours to maintain male privilege in marriages and faith environments, with some faith leaders and community members actively engaged in perpetrating these behaviours. Further research is recommended to determine if factors that influenced Jessica’s lived experience of domestic violence are replicated in the lives of other Christian women.
Integral Field Spectroscopy of the Cometary Starburst Galaxy NGC 4861
Creators: name: Roche, Nathan
name: Vílchez, José M.
name: Iglesias-Páramo, Jorge
name: Papaderos, Polychronis
name: Sánchez, Sebastian F.
name: Kehrig, Carolina
name: Puertas, Salvador Duarte
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Using the PMAS Integral Field Unit on the Calar Alto 3.5m telescope we observed the southern component (Markarian 59) of the `cometary' starburst galaxy NGC 4861. Mrk 59 is centred on a giant nebula and concentration of stars 1 kpc in diameter. Strong $\rm Hα$ emission points to a star-formation rate (SFR) at least 0.47 $\rm M_{\odot}yr^{-1}$. Mrk 59 has a very high [OIII]$\rm\lambda5007/Hβ$ ratio, reaching 7.35 in the central nebula, with a second peak at a star-forming hotspot further north. Fast outflows are not detected but nebular motion and galaxy rotation produce relative velocities up to 40 km $\rm s^{-1}$. Spectral analysis of different regions with `Fitting Analysis using Differential evolution Optimisation' (FADO) finds that the stars in the central and `spur' nebulae are very young, $\rm \leq125~Myr$ with a large $\rm <10~Myr$ contribution. Older stars ($\rm \sim 1~Gyr$) make up the northern disk component, while the other regions show mixtures of 1 Gyr age with very young stars. This and the high specific SFR $\rm\sim 3.5~Gyr^{-1}$ imply a bimodal star formation history, with Mrk 59 formed in ongoing starbursts fuelled by a huge gas inflow, turning the galaxy into an asymmetric `green pea' or blue compact dwarf. We map the HeII$\lambda4686$ emission, and identify a broad component from the central nebula, consistent with the emission of $\sim 300$ Wolf-Rayet stars. About a third of the HeII$λ$4686 flux is a narrow line emitted from a more extended area covering the central and spur nebulae, and may have a different origin.
description: 19 pages, 24 figures. Accepted for publication in MNRAS
Utilizando aprendizagem profunda e imagens de satélite para prever indicadores socioeconômicos no Vale do Ribeira
Creators: name: De Melo Sousa, Isabella
name: Machicao, Jeaneth
name: Corrêa, Pedro Luiz Pizzigatti
Publisher: name: Zenodo
Year: 2022
Subjects: deep learning
remote sensing imagery
Vale do Ribeira
data science

description: Undegraduate poster related to PARSEC project presented at the 30º SIICUSP (2022) Video presentation on Youtube
description: Acknowledgments: The PARSEC project is funded by the Belmont Forum, Collaborative Research Action on Science-Driven e-Infrastructures Innovation.
A cavity-stabilized laser with acceleration sensitivity below $10^{-12}$/g
Creators: name: Leibrandt, David R.
name: Bergquist, James C.
name: Rosenband, Till
Publisher: name: arXiv
Year: 2013
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We characterize the frequency-sensitivity of a cavity-stabilized laser to inertial forces and temperature fluctuations, and perform real-time feed-forward to correct for these sources of noise. We measure the sensitivity of the cavity to linear accelerations, rotational accelerations, and rotational velocities by rotating it about three axes with accelerometers and gyroscopes positioned around the cavity. The worst-direction linear acceleration sensitivity of the cavity is $2(1) \times 10^{-11}$/g measured over 0-50 Hz, which is reduced by a factor of 50 to below $10^{-12}$/g for low-frequency accelerations by real-time feed-forward corrections of all of the aforementioned inertial forces. A similar idea is demonstrated in which laser frequency drift due to temperature fluctuations is reduced by a factor of 70 via real-time feed-forward from a temperature sensor located on the outer wall of the cavity vacuum chamber.
description: 8 pages, 9 figures
Down-conversion source of positively spectrally correlated and decorrelated photon pairs at telecom wavelength
Creators: name: Lutz, Thomas
name: Kolenderski, Piotr
name: Jennewein, Thomas
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: The frequency correlation (or decorrelation) of photon pairs is of great importance in long-range quantum communications and photonic quantum computing. We experimentally characterize a spontaneous parametric down conversion (SPDC) source, based on a Beta-Barium Borate (BBO) crystal cut for type-II phase matching at 1550 nm which emits photons with the positive or no spectral correlations. Our system employs a carefully designed detection method exploiting two InGaAs detectors.
description: 3 pages, 4 figures
Lattice Boltzmann method for shape optimization of fluid distributor
Creators: name: Wang, Limin
name: Fan, Yilin
name: Luo, Lingai
Publisher: name: arXiv
Year: 2013
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: This paper presents the shape optimization of a flat-type arborescent fluid distributor for the purpose of process intensification. A shape optimization algorithm based on the lattice Boltzmann method (LBM) is proposed with the objective of decreasing the flow resistance of such distributor at the constraint of constant fluid volume. Prototypes of the initial distributor as well as the optimized one are designed. Fluid distribution and hydraulic characteristics of these distributors are investigated numerically. Results show that the pressure drop of the optimized distributor is between 15.9% and 25.1% lower than that of the initial reference while keeping a uniform flow distribution, demonstrating the process intensification in fluid distributor, and suggesting the interests of the proposed optimization algorithm in engineering optimal design.
description: 19 pages, 10 figures, 1 table
ChartSumm: A Comprehensive Benchmark for Automatic Chart Summarization of Long and Short Summaries
Creators: name: Rahman, Raian
name: Hasan, Rizvi
name: Farhad, Abdullah Al
name: Laskar, Md Tahmid Rahman
name: Ashmafee, Md. Hamjajul
name: Kamal, Abu Raihan Mostofa
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computation and Language (cs.CL)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Automatic chart to text summarization is an effective tool for the visually impaired people along with providing precise insights of tabular data in natural language to the user. A large and well-structured dataset is always a key part for data driven models. In this paper, we propose ChartSumm: a large-scale benchmark dataset consisting of a total of 84,363 charts along with their metadata and descriptions covering a wide range of topics and chart types to generate short and long summaries. Extensive experiments with strong baseline models show that even though these models generate fluent and informative summaries by achieving decent scores in various automatic evaluation metrics, they often face issues like suffering from hallucination, missing out important data points, in addition to incorrect explanation of complex trends in the charts. We also investigated the potential of expanding ChartSumm to other languages using automated translation tools. These make our dataset a challenging benchmark for future research.
description: Accepted as a long paper at the Canadian AI 2023
Classical and quantum ordering of protons in cold solid hydrogen under megabar pressures
Creators: name: Li, Xin-Zheng
name: Walker, Brent
name: Probert, Matthew I. J.
name: Pickard, Chris J.
name: Needs, Richard J.
name: Michaelides, Angelos
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: A combination of state-of-the-art theoretical methods has been used to obtain an atomic-level picture of classical and quantum ordering of protons in cold high-pressure solid hydro-gen. We focus mostly on phases II and III of hydrogen, exploring the effects of quantum nuclear motion on certain features of these phases (through a number of ab initio path-integral molecular dynamics (PIMD) simulations at particular points on the phase diagram). We also examine the importance of van der Waals forces in this system by performing calculations using the optB88-vdW density functional, which accounts for non-local correlations. Our calculations reveal that the transition between phases I and II is strongly quantum in nature, resulting from a competition between anisotropic inter-molecular interactions that restrict molecular rotation and thermal plus quantum fluctuations of the nuclear positions that facilitate it. The transition from phase II to III is more classical because quantum nuclear motion plays only a secondary role and the transition is determined primarily by the underlying potential energy surface. A structure of P21c symmetry with 24 atoms in the primitive unit cell is found to be stable when anharmonic quantum nuclear vibrational motion is included at finite temperatures using the PIMD method. This structure gives a good account of the infra-red (IR) and Raman vibron frequencies of phase II. We find ad-ditional support for C2/c structure as a strong candidate for phase III, since it remains transparent up to 300 GPa, even when quantum nuclear effects are included. Finally, we find that accounting for van der Waals forces improves the agreement between experiment and theory for the parts of the phase diagram considered, when compared to previous work which employed the widely-used Perdew-Burke-Ernzerhof (PBE) exchange-correlation functional.
description: 6 figures, plus on supplementary information
Long-lived quantum coherent dynamics of a $Λ$-system driven by a thermal environment
Creators: name: Koyu, Suyesh
name: Tscherbul, Timur V.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Atomic Physics (physics.atom-ph)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: We present a theoretical study of quantum coherent dynamics of a three-level $Λ$ system driven by a thermal environment (such as blackbody radiation), which serves as an essential building block of photosynthetic light-harvesting models and quantum heat engines. By solving the nonsecular Bloch-Redfield master equations, we obtain analytical results for the ground-state population and coherence dynamics and classify the dynamical regimes of the incoherently driven $Λ$-system as underdamped and overdamped depending on whether the ratio $Δ/[r f(p)]$ is greater or less than one, where $Δ$ is the ground-state energy splitting, $r$ is the incoherent pumping rate, and $f(p)$ is a function of the transition dipole alignment parameter $p$. In the underdamped regime, we observe long-lived coherent dynamics that lasts for $τ_c\simeq 1/r$, even though the initial state of the $Λ$-system contains no coherences in the energy basis. In the overdamped regime for $p = 1$, we observe the emergence of coherent quasi-steady states with the lifetime $τ_{c} = 1.34 (r/Δ^{2})$, which have low von Neumann entropy compared to the conventional thermal states. We propose an experimental scenario for observing noise-induced coherent dynamics in metastable He$^*$ atoms driven by x-polarized incoherent light. Our results suggest that thermal excitations can generate experimentally observable long-lived quantum coherent dynamics in the ground-state subspace of atomic and molecular $Λ$ systems in the absence of coherent driving.
Boundary quantum Knizhnik-Zamolodchikov equations and fusion
Creators: name: Reshetikhin, Nicolai
name: Stokman, Jasper
name: Vlaar, Bart
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Algebra (math.QA)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: In this paper we extend our previous results concerning Jackson integral solutions of the boundary quantum Knizhnik-Zamolodchikov equations with diagonal K-operators to higher-spin representations of quantum affine $\mathfrak{sl}_2$. First we give a systematic exposition of known results on $R$-operators acting in the tensor product of evaluation representations in Verma modules over quantum $\mathfrak{sl}_2$. We develop the corresponding fusion of $K$-operators, which we use to construct diagonal $K$-operators in these representations. We construct Jackson integral solutions of the associated boundary quantum Knizhnik-Zamolodchikov equations and explain how in the finite-dimensional case they can be obtained from our previous results by the fusion procedure.
description: 36 pages; some small additions and corrections concerning mero-uniform convergence (Defn. 6.1) and rectified some notation issues for the function \mathcal{Y} (p21 and onwards). appears in Annales Henri Poincar\'e, 2014
Thermal squeezing and nonlinear spectral shift of magnons in antiferromagnetic insulators
Creators: name: Shiranzaei, Mahroo
name: Troncoso, Roberto E.
name: Fransson, Jonas
name: Brataas, Arne
name: Qaiumzadeh, Alireza
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We investigate the effect of magnon-magnon interactions on the dispersion and polarization of magnons in collinear antiferromagnetic (AF) insulators at finite temperatures. In two-sublattice AF systems with either uniaxial or biaxial magnetocrystalline anisotropies, we implement a self-consistent Hartree-Fock mean-field approximation to explore the nonlinear thermal interactions. The resulting nonlinear magnon interactions separate into two-magnon intra- and interband scattering processes. Furthermore, we compute the temperature dependence of the magnon bandgap and AF resonance modes due to nonlinear magnon interactions for square and hexagonal lattices. In addition, we study the effect of magnon interactions on the polarization of magnon modes. We find that although the noninteracting eigenmodes in the uniaxial case are circularly polarized, but in the presence of nonlinear thermal interactions the local U(1) symmetry of the Hamiltonian is broken. The attractive nonlinear interactions squeeze the low-energy magnon modes and make them elliptical. In the biaxial case, on the other hand, the bare eigenmodes of low energy magnons are elliptically polarized but thermal nonlinear interactions squeeze them further. Direct measurements of the predicted temperature-dependent AF resonance modes and their polarization can be used as a tool to probe the nonlinear interactions. Our findings establish a framework for exploring the effect of thermal magnon interactions in technologically important magnetic systems, such as magnetic stability of recently discovered two-dimensional magnetic materials, coherent transport of magnons, Bose-Einstein condensation of magnons, and magnonic topological insulators.
Knowledge Work im digitalen Wandel.
Creators: name: Abbas, Marina
name: Dröge, Kai
name: Fuchs, Gesine
name: Kels, Peter
name: Magnin, Chantal
Publisher: name: Zenodo
Year: 2021
Subjects: Knowledge Work
Karriere
Wissensarbeit
Future Skills
Kompetenzentwicklung
Digitalisierung

description: Das Workingpaper beleuchtet, welche Herausforderungen der digitale Wandel für die Kompetenz- und Karriereentwicklung von Wissensarbeitenden generiert. Im Zentrum stehen Einschätzungen zu drei Fragestellungen: Welche wissensbasierten Tätigkeits- und Berufsfelder sind insofern als «hot spots» der digitalen Transformation zu betrachten, dass sich die Tätigkeit- und Kompetenzprofile wie auch Entwicklungswege für Beschäftigten hier grundlegend verändern und die Arbeitsmarkt- und Beschäftigungsfähigkeit von Wissensarbeitenden unter Druck gerät? Welche Schlüsselkompetenzen, Mindsets und individuellen Ressourcen brauchen Mitarbeitende, um sich in einer digital ver­änderten Arbeits- und Karrierewelt erfolgreich zu bewegen? Welche Ansätze sind erfolgversprechend, um Wissensarbeitende beim Erwerb karriererelevanter Schlüsselkompetenzen und Ressourcen im Umgang mit der digitalen Transformation zu unterstützen?
description: + ID der Publikation: hslu_84078 + Art des Beitrages: Working Paper + Titel der Reihe: ITC Digitale Transformation der Arbeitswelt Working Paper Series, Nr. 002/2021 Sprache: Deutsch + Letzte Aktualisierung: 2021-07-13 14:24:37
Constraining Cosmic Expansion and Gravity with Galaxy Redshift Surveys
Creators: name: Daniel, Scott F.
name: Linder, Eric V.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We analyze the science reach of a next generation galaxy redshift survey such as BigBOSS to fit simultaneously for time varying dark energy equation of state and time- and scale-dependent gravity. The simultaneous fit avoids potential bias from assuming $Λ$CDM expansion or general relativity and leads to only modest degradation in constraints. Galaxy bias, fit freely in redshift bins, is self calibrated by spectroscopic measurements of redshift space distortions and causes little impact. The combination of galaxy redshift, cosmic microwave background, and supernova distance data can deliver 5-10% constraints on 6 model independent modified gravity quantities.
description: 5 pages, 5 figures
Characterizing the Cool KOIs IV: Kepler-32 as a prototype for the formation of compact planetary systems throughout the Galaxy
Creators: name: Swift, Jonathan J.
name: Johnson, John Asher
name: Morton, Timothy D.
name: Crepp, Justin R.
name: Montet, Benjamin T.
name: Fabrycky, Daniel C.
name: Muirhead, Philip S.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The Kepler space telescope has opened new vistas in exoplanet discovery space by revealing populations of Earth-sized planets that provide a new context for understanding planet formation. Approximately 70% of all stars in the Galaxy belong to the diminutive M dwarf class, several thousand of which lie within Kepler's field of view, and a large number of these targets show planet transit signals. Kepler-32 is a typical star in the Kepler M dwarf sample that presents us with a rare opportunity: five planets transit this star giving us an expansive view of its architecture. All five planets of this compact system orbit their host star within a distance one third the size of Mercury's orbit with the innermost planet positioned a mere 4.3 stellar radii from the stellar photosphere. New observations limit possible false positive scenarios allowing us to validate the entire Kepler-32 system making it the richest known system of transiting planets around an M dwarf. Based on considerations of the stellar dust sublimation radius, the near period commensurability of three adjacent planets, a minimum mass protoplanetary nebula, and the volatile content inferred for the planets, we propose that the Kepler-32 planets formed at larger orbital radii and migrated inward to their present locations. The volatile content inferred for the Kepler-32 planets and order of magnitude estimates for the disk migration rates suggest these planets may have formed beyond the snow line and migrated in the presence of a gaseous disk. The Kepler-32 planets are representative of the full ensemble of planet candidates orbiting the Kepler M dwarfs for which we calculate an occurrence rate of 1.0 +/- 0.1 planet per star. The formation of the Kepler-32 planets therefore offers a plausible blueprint for the formation of one of the largest known populations of planets in our Galaxy.
description: 15 pages, 10 figures, ApJ accepted
Exact solvability and two-frequency Rabi oscillation in cavity-QED setup with moving emitter
Creators: name: Weng, Mingzhu
name: Wang, Zhihai
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this paper, we investigate the energy spectrum and coherent dynamical process in a cavity-QED setup with a moving emitter, which is subject to a harmonic potential. We find that the vibration of the emitter will induce the effective Kerr and optomechanical interactions. We generalize the Bogliubov operators approach which dealt with quantum Rabi model, to our cavity-emitter-vibration system and obtain the energy spectrum exactly. With the assistance of Bogliubov operators approach, we obtain the energy spectrum of the system exactly. Furthermore, we show that the dynamics of the system exhibit a two-frequency Rabi oscillation behavior. We explain such behavior by optomechanical interaction induced quantum transition between emitter-cavity dressed states. We hope that the interaction between cavity mode and moving emitter will provide a versatile platform to explore more exotic effects and potential applications in cavity-QED scenario.
description: 8 pages, 5 figures. Accepted by EPL
Knowledge Work im digitalen Wandel
Creators: name: Kels, Peter
name: Dröge, Kai
name: Abbas, Marina
name: Fuchs, Gesine
name: Lanfranconi, Lucia
name: Gisin, Leila
name: Magnin, Chantal
name: Willimann, Ivo
name: Z'Rotz, Jana
Publisher: name: Zenodo
Year: 2021
Subjects: Knowledge Work
Karriere
Wissensarbeit
Future Skills
Kompetenzentwicklung
Digitalisierung

description: Das Workingpaper beleuchtet, welche Herausforderungen der digitale Wandel für die Kompetenz- und Karriereentwicklung von Wissensarbeitenden generiert. Im Zentrum stehen Einschätzungen zu drei Fragestellungen: Welche wissensbasierten Tätigkeits- und Berufsfelder sind insofern als «hot spots» der digitalen Transformation zu betrachten, dass sich die Tätigkeit- und Kompetenzprofile wie auch Entwicklungswege für Beschäftigten hier grundlegend verändern und die Arbeitsmarkt- und Beschäftigungsfähigkeit von Wissensarbeitenden unter Druck gerät? Welche Schlüsselkompetenzen, Mindsets und individuellen Ressourcen brauchen Mitarbeitende, um sich in einer digital ver­änderten Arbeits- und Karrierewelt erfolgreich zu bewegen? Welche Ansätze sind erfolgversprechend, um Wissensarbeitende beim Erwerb karriererelevanter Schlüsselkompetenzen und Ressourcen im Umgang mit der digitalen Transformation zu unterstützen?
description: + ID der Publikation: hslu_84078 + Art des Beitrages: Working Paper + Titel der Reihe: ITC Digitale Transformation der Arbeitswelt Working Paper Series, Nr. 002/2021 Sprache: Deutsch + Letzte Aktualisierung: 2021-07-13 14:24:37
Unveiling the impurity band inducing ferromagnetism in magnetic semiconductor (Ga,Mn)As
Creators: name: Kobayashi, Masaki
name: Muneta, Iriya
name: Takeda, Yukiharu
name: Harada, Yoshihisa
name: Fujimori, Atsushi
name: Krempasky, Juraj
name: Schmitt, Thorsten
name: Ohya, Sinobu
name: Tanaka, Masaaki
name: Oshima, Masaharu
name: Strocov, Vladimir N.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: (Ga,Mn)As is a paradigm diluted magnetic semiconductor which shows ferromagnetism induced by doped hole carriers. With a few controversial models emerged from numerous experimental and theoretical studies, the mechanism of the ferromagnetism in (Ga,Mn)As still remains a puzzling enigma. In this Letter, we use soft x-ray angle-resolved photoemission spectroscopy to positively identify the ferromagnetic Mn 3d-derived impurity band in (Ga,Mn)As. The band appears hybridized with the light-hole band of the host GaAs. These findings conclude the picture of the valence band structure of (Ga,Mn)As disputed for more than a decade. The non-dispersive character of the IB and its location in vicinity of the valence-band maximum indicate that the Mn 3d-derived impurity band is formed as a split-off Mn-impurity state predicted by the Anderson impurity model. Responsible for the ferromagnetism in (Ga,Mn)As is the transport of hole carriers in the impurity band.
description: 5 pages, 3 figures
Relative velocity of dark matter and barions in clusters of galaxies and measurements of their peculiar velocities
Creators: name: Dolag, Klaus
name: Sunyaev, Rashid
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The increasing sensitivity of current experiments, which nowadays routinely measure the thermal SZ effect within galaxy clusters, provide the hope that peculiar velocities of individual clusters of galaxies will be measured rather soon using the kinematic SZ effect. Also next generation of X-ray telescopes with microcalorimeters, promise first detections of the motion of the intra cluster medium (ICM) within clusters. We used a large set of cosmological, hydrodynamical simulations, which cover very large cosmological volume, hosting a large number of rich clusters of galaxies, as well as moderate volumes where the internal structures of individual galaxy clusters can be resolved with very high resolution to investigate, how the presence of baryons and their associated physical processes like cooling and star-formation are affecting the systematic difference between mass averaged velocities of dark matter and the ICM inside a cluster. We, for the first time, quantify the peculiar motion of galaxy clusters as function of the large scale environment. We also demonstrate that especially in very massive systems, the relative velocity of the ICM compared to the cluster peculiar velocity add significant scatter onto the inferred peculiar velocity, especially when measurements are limited to the central regions of the cluster. Depending on the aperture used, this scatter varies between 50% and 20%, when going from the core (e.g. ten percent of the virial radius) to the full cluster (e.g. the virial radius).
description: 17 pages, 18 figures, submitted to MNRAS
Gauge and Poincare properties of the UV cutoff and UV completion in quantum field theory
Creators: name: Demir, Durmus
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The ultraviolet (UV) cutoff on a quantum field theory (QFT) can explicitly break or conserve the Poincare (translation) symmetry. And the very same cutoff can explicitly break or conserve the gauge symmetry. In the present work, we perform a systematic study of the UV cutoff in regard to its gauge and Poincare properties, and construct UV completions restoring the broken gauge symmetry. In the case of Poincare-conserving UV cutoff, we find that the gauge symmetry gets restored via the Higgs mechanism. In the case of Poincare-breaking UV cutoff, however, we find that the flat spacetime affine curvature takes the place of the Higgs field and, when taken to curved spacetime, gauge symmetry gets restored at the extremum of the metric-affine action. We also find that gravity emerges at the extremum if the QFT under concern consists of new particles beyond the known ones. The resulting emergent gravity plus renormalized QFT setup has the potential to reveal itself in various astrophysical, cosmological and collider phenomena.
description: 17 pages, 1 figure. v2: Added a reference, corrected typos
Pengaruh Gaya Kepemimpinan dan Budaya Organisasi terhadap Kinerja Dosen melalui Kepuasan Kerja Dosen: Studi Kasus di Universitas Terbuka
Creators: name: Hermawan, Budi
Publisher: name: figshare
Year: 2023
Subjects: Human resources management
Higher education

description: Sinopsis Disertasi
Theory of perturbation of electric potential by a 3D object made of an anisotropic dielectric material
Creators: name: Lakhtakia, Akhlesh
name: Alkhoori, Hamad M.
name: Tsitsas, Nikolaos L.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: The extended boundary condition method (EBCM) was formulated for the perturbation of a source electric potential by a 3D object composed of a homogeneous anisotropic dielectric medium whose relative permittivity dyadic is positive definite. The formulation required the application of Green's second identity to the exterior region to deduce the electrostatic counterpart of the Ewald--Oseen extinction theorem. The electric potential inside the object was represented using a basis obtained by implementing an affine bijective transformation of space to the Gauss equation for the electric field. The EBCM yields a transition matrix that depends on the geometry and the composition of the 3D object, but not on the source potential.
SQUID-based interferometric accelerometer
Creators: name: Khomchenko, Ilia
name: Navez, Patrick
name: Ouerdane, Henni
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Optics and more recently coherent matter waves enabled inertial sensors such as accelerometers and gyroscopes to reach high levels of resolution and sensitivity. As these technologies rest on physical phenomena that require particular setups and working conditions such as, e.g., kilometers of optical fibers or ultralow temperatures, their application range is limited because of lack of portability. Here, we propose a path forward considering a superconducting quantum interference device (SQUID) to detect and measure acceleration, using electronic interferometry. The operation of such an accelerometer rests on the ability of the Cooper pairs to record their wave function phase change as the device is subjected either to a transverse acceleration or vibrations. We provide numerical evidence for the feasibility of SQUID-based accelerometers that can be used for transverse acceleration and oscillatory motion measurement.
description: Theoretical paper but feedback from experimentalists would be highly welcome
Non-exotic static spherically symmetric thin-shell wormhole solution in $f(Q,T)$ gravity
Creators: name: Tayde, Moreshwar
name: Ghosh, Sayantan
name: Sahoo, P. K.
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this study, we have conducted an analysis of traversable wormhole solutions within the framework of linear $f(Q, T) = αQ + βT$ gravity, ensuring that all the energy conditions hold for the entire spacetime. The solutions presented in this study were derived through a comprehensive analytical examination of the parameter space associated with the wormhole model. This involved considering the exponents governing the redshift and shape functions, as well as the radius of the wormhole throat ($r_0$), the redshift function value at the throat ($ϕ_0$), and the model parameters ($α$ and $β$). Also, we have established bounds on these free parameters that guarantee the satisfaction of the energy conditions throughout spacetime and have also provided two solutions. Further, we have used the Israel junction condition to see the stability of a thin-shell around the wormhole. We have also calculated the NEC criteria and potential for such a thin-shell and how it varies with the chosen shape function.
description: Chinese Physics C published version