cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Η σχέση φυσικής κατάστασης και εργασιακής κόπωσης στο ελληνικό εργασιακό περιβάλλον
Creators: name: Χατζηκωνσταντίνου, Πρόδρομος
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2022
Subjects: subject: Φυσική κατάσταση
subject: Κόπωση
subject: Απόδοση
subject: Άσκηση

description: Η φυσική κατάσταση αποτελεί τη σημερινή εποχή ένα ιδιαίτερα σημαντικό στοιχείο προς μελέτη καθώς έχει συνδεθεί με πλήθος άλλων παραγόντων που συνθέτουν την ανθρώπινη καθημερινότητα. Η παρούσα έρευνα επιχειρεί με τη χρήση τριών κλιμάκων να συνδέσει την φυσική κατάσταση με την εργασιακή κόπωση και κατά επέκταση με την εργασιακή απόδοση. Τα δεδομένα συλλέχτηκαν από 231 εργαζομένους μέσω ερωτηματολογίου. Οι ερωτηθέντες προέρχονται από διάφορους κλάδους του ιδιωτικού και δημόσιου τομέα στους οποίους ζητήθηκε να αξιολογήσουν τη φυσική τους κατάσταση, την εργασιακή τους κόπωση και απόδοση. Τα αποτελέσματα της έρευνας δείχνουν μια αρνητική σχέση ανάμεσα στην φυσική κατάσταση και την εργασιακή κόπωση, ενώ η εργασιακή κόπωση εμφανίζει θετική συσχέτιση με την αντιπαραγωγική συμπεριφορά. Συνεπώς φαίνεται να υπάρχει μια αλληλεξάρτηση ανάμεσα στις τρεις κλίμακες υπό διερεύνηση.
A grid of self-consistent MSG (MARCS-StaticWeather-GGchem) cool stellar, sub-stellar, and exoplanetary model atmospheres
Creators: name: Jørgensen, Uffe G.
name: Amadio, Flavia
name: Estrada, Beatriz Campos
name: Møller, Kristian Holten
name: Schneider, Aaron D.
name: Balduin, Thorsten
name: D'Alessandro, Azzurra
name: Symeonidou, Eftychia
name: Helling, Christiane
name: Nordlund, Åke
name: Woitke, Peter
Publisher: name: arXiv
Year: 2024
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Computation of a grid of self consistent 1D model atmospheres of cool stars, sub-stellar objects and exoplanets in the effective temperature range 300K to 3000K, including cloud formation, chemical non-equilibrium effects, and stellar irradiation.
 The models are called MSG, because they are based on an iterative coupling between three well tested codes, the MARCS stellar atmosphere code, the StaticWeather cloud formation code and the GGchem chemical equilibrium code. It includes up-to-date molecular and atomic opacities, cloud formation and advanced chemical equilibrium calculations, and involves new numerical methods at low temperatures to allow robust convergence.
 The coupling between the MARCS radiative transfer and GGchem chemical equilibrium computations has made it possibly effectively to reach convergence based on electron pressure for the warmer models and gas pressure for the cooler models, enabling self-consistent modelling of stellar, sub-stellar and exoplanetary objects in a very wide range of effective temperatures. Here we describe the basic details of the models, with illustrative examples of cloudy and irradiated models as well as models based on non-equilibrium chemistry.
 The qualitative changes in the relative abundances of TiO, H2O, CH4, NH3, and other molecules in our models follow the observationally defined M, L, T (and Y) sequences, but reveal more complex and depth dependent abundance changes, and therefore a spectral classification depending on more parameters. The self consistent coupling to Static-Weather cloud computations, allows detailed comparison between nucleation and observed relative dimming of different spectral bands, with advanced applications for new identification methods of potential exoplanetary biology.
Quantum resources of the steady-state of three coupled qubits: Microscopic versus Phenomenological model
Creators: name: Diniz, E. C.
name: Costa, A. C. S.
name: Castelano, L. K.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum resources, such as entanglement, steering, and Bell nonlocality, are evaluated for three coupled qubits in the steady-state configuration. We employ the phenomenological master equation and the microscopic master equation to probe such quantum resources, which provide very different results depending on the system configuration. In particular, steering and Bell nonlocality are null within the phenomenological model, while they reach considerable values within the microscopic model. These results show that the phenomenological approach is not able to capture all quantum resources of the system. We also provide an analytical expression for the steady-state and quantum resources of the system composed of three coupled qubits in the zero temperature limit. Such results demonstrate that quantum resources between two qubits are strongly affected by the third qubit in a nontrivial way.
description: 17 pages, 4 figures. Updated to the published version
A$^3$COSMOS: the dust mass function and dust mass density at $0.5
Creators: name: Traina, A.
name: Magnelli, B.
name: Gruppioni, C.
name: Delvecchio, I.
name: Parente, M.
name: Calura, F.
name: Bisigello, L.
name: Feltre, A.
name: Pozzi, F.
name: Vallini, L.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Context. Although dust in galaxies represents only a few percent of the total baryonic mass, it plays a crucial role in the physical processes occurring in galaxies. Studying the dust content of galaxies, particularly at high$-z$, is therefore crucial to understand the link between dust production, obscured star formation and the build-up of galaxy stellar mass.
 Aims. To study the dust properties (mass and temperature) of the largest Atacama Large Millimeter/submillimeter Array (ALMA)-selected sample of star-forming galaxies available from the archive (A$^3$COSMOS) and derive the dust mass function and dust mass density of galaxies from $z=0.5\,-\,6$.
 Methods. We performed spectral energy distribution (SED) fitting with the CIGALE code to constrain the dust mass and temperature of the A$^3$COSMOS galaxy sample, thanks to the UV-to-near-infrared photometric coverage of each galaxies combined with the ALMA (and Herschel when available) coverage of the Rayleigh-Jeans tail of their dust-continuum emission. We then computed and fitted the dust mass function by combining the A$^3$COSMOS and state-of-the-art {\it Herschel} samples, in order to obtain the best estimate of the integrated dust mass density up to $z \sim 6$.
 Results. Galaxies in \a3 have dust masses between $\sim 10^8$ and $\sim 10^{9.5}$ M$_{\odot}$. From the SED fitting, we were also able to derive a dust temperature, finding that the distribution of the dust temperature peaks at $\sim 30-35$K. The dust mass function at $z=0.5\,-\,6$ evolves with an increase of $M^*$ and decrease of the number density ($Φ^*$) and is in good agreement with literature estimates. The dust mass density shows a smooth decrease in its evolution from $z \sim 0.5$ to $z \sim 6$, which is steeper than what is found by models at $z \gtrsim 2$.
description: 11 pages, 9 figures, Accepted for publication on A&A
The BeppoSAX WFC X-ray source catalogue
Creators: name: Verrecchia, F.
name: Zand, J. J. M. in 't
name: Giommi, P.
name: Santolamazza, P.
name: Granata, S.
name: Schuurmans, J. J.
name: Antonelli, A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the catalogue of X-ray sources detected by the two Wide Field Cameras (WFCs) in complete observations on board BeppoSAX during its 6 years of operational lifetime, between April 1996 and April 2002. The BeppoSAX WFCs were coded mask instruments sensitive in the 2-28 keV energy band with a 40x40 square degree fields of view, pointing in opposite directions and perpendicularly to the BeppoSAX Narrow Field Instruments (NFI). The WFCs were usually operated simultaneously to NFI observations, each lasting up to several days. WFCs observed thus the entire sky several times with a typical sensitivity of 2 to 10 mCrab. A systematic analysis of all WFC observations in the BeppoSAX archive has been carried out using the latest post-mission release of the WFC analysis software and calibrations. The catalogue includes 253 distinct sources, obtained from a total sample of 8253 WFC detections. We describe the basic statistical properties of the sample and present a six-year history of two celestial calibration X-ray sources.
description: 15 pages, 11 figures, Catalogue, Accepted for publication on A&A
The Simons Observatory: Dark Characterization of the Large Aperture Telescope
Creators: name: Haridas, Saianeesh K.
name: Ahmed, Zeeshan
name: Bhandarkar, Tanay
name: Devlin, Mark
name: Dicker, Simon
name: Duff, Shannon M.
name: Dutcher, Daniel
name: Harrington, Kathleen
name: Henderson, Shawn W.
name: Hubmayr, Johannes
name: Johnson, Bradley R.
name: Kofman, Anna
name: Manduca, Alex
name: Niemack, Michael D.
name: Randall, Michael J.
name: Satterthwaite, Thomas P.
name: Orlowski-Scherer, John
name: Schmitt, Benjamin L.
name: Sierra, Carlos
name: Silva-Feaver, Max
name: Thornton, Robert J.
name: Wang, Yuhan
name: Zheng, Kaiwen
Publisher: name: arXiv
Year: 2024
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The Simons Observatory (SO) is a cosmic microwave background experiment composed of three 0.42 m Small Aperture Telescopes (SATs) and one 6 m Large Aperture Telescope (LAT) in the Atacama Desert of Chile. The Large Aperture Telescope Receiver (LATR) was integrated into the LAT in August 2023; however, because mirrors were not yet installed, the LATR optical chain was capped at the 4K stage. In this dark configuration we are able to characterize many elements of the instrument without contributions from atmospheric noise. Here we show this noise is below the required upper limit and its features are well described with a simple noise model. Maps produced using this noise model have properties that are in good agreement with the white noise levels of our dark data. Additionally, we show that our nominal scan strategy has a minimal effect on the noise when compared to the noise when the telescope is stationary
Existence of One-Body Barrier Revealed in Deep Sub-Barrier Fusion
Creators: name: Ichikawa, Takatoshi
name: Hagino, Kouichi
name: Iwamoto, Akira
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Based on the adiabatic picture for heavy-ion reactions, in which the neck formation in the one-body system is taken into account, we propose a two-step model for fusion cross sections at deep subbarrier energies. This model consists of the capture process in the two-body potential pocket, which is followed by the penetration of the adiabatic one-body potential to reach a compound state after the touching configuration. We describe the former process with the coupled-channels framework, while the latter with the WKB approximation by taking into account the coordinate dependent inertia mass. The effect of the one-body barrier is important at incident energies below the potential energy at the touching configuration. We show that this model well accounts for the steep fall-off phenomenon of fusion cross sections at deep subbarrier energies for the $^{64}$Ni+$^{64}$Ni and $^{58}$Ni+$^{58}$Ni reactions.
description: 4 pages, 3 figures
MUSEQuBES: Characterizing the circumgalactic medium of redshift $\approx3.3$ Ly$α$ emitters
Creators: name: Muzahid, Sowgat
name: Schaye, Joop
name: Cantalupo, Sebastiano
name: Marino, Raffaella Anna
name: Bouche, Nicolas F.
name: Johnson, Sean
name: Maseda, Michael
name: Wendt, Martin
name: Wisotzki, Lutz
name: Zabl, Johannes
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present the first characterization of the circumgalactic medium of Ly$α$ emitters (LAEs), using a sample of 96 $z\approx3.3$ LAEs detected with the VLT/MUSE in fields centered on 8 bright background quasars. The LAEs have low Ly$α$ luminosities ($\sim 10^{42}\,\text{erg}\,\text{s}^{-1}$) and star formation rates (SFRs) $\sim 1~\text{M}_\odot\,\text{yr}^{-1}$, which for main sequence galaxies corresponds to stellar masses of only $\sim 10^{8.6}\,\text{M}_\odot$. The median transverse distance between the LAEs and the quasar sightlines is 165 proper kpc (pkpc). We stacked the high-resolution quasar spectra and measured significant excess HI and CIV absorption near the LAEs out to 500 $\text{km}\,\text{s}^{-1}$ and at least $\approx 250$ pkpc (corresponding to $\approx 7$ virial radii). At $\lesssim 30~\text{km}\,\text{s}^{-1}$ from the galaxies the median HI and CIV optical depths are enhanced by an order of magnitude. The absorption is significantly stronger around the $\approx 1/3$ of our LAEs that are part of `groups', which we attribute to the large-scale structures in which they are embedded. We do not detect any strong dependence of either the HI or CIV absorption on transverse distance (over the range $\approx 50-250$ pkpc), redshift, or the properties of the Ly$α$ emission line (luminosity, full width at half maximum, or equivalent width). However, for HI, but not CIV, the absorption at $\lesssim 100\,\text{km}\,\text{s}^{-1}$ from the LAE does increase with the SFR. This suggests that LAEs surrounded by more HI tend to have higher SFRs.
description: MNRAS accepted on 06 October, 2021
Fermion masses, Leptogenesis and Supersymmetric SO(10) Unification
Creators: name: Romão, J. C.
name: Tórtola, M. A.
name: Hirsch, M.
name: Valle, J. W. F.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Current neutrino oscillation data indicate the existence of two large lepton mixing angles, while Kobayashi-Maskawa matrix elements are all small. Here we show how supersymmetric SO(10) with extra chiral singlets can easily reconcile large lepton mixing angles with small quark mixing angles within the framework of the successful Fritzsch ansatz. Moreover we show how this is fully consistent with the thermal leptogenesis scenario, avoiding the so-called gravitino problem. A sizeable asymmetry can be generated at relatively low scales. We present our results in terms of the leptonic CP violation parameter that characterizes neutrino oscillations.
description: 18 pages, 9 figures, 1 table, new section discussing washout factor added, matches version published in Phys. Rev. D
Analytic crossing probabilities for certain barriers by Brownian motion
Creators: name: Kahale, Nabil
Publisher: name: arXiv
Year: 2007
Subjects: subject: Probability (math.PR)
subject: Functional Analysis (math.FA)
subject: Statistics Theory (math.ST)
subject: FOS: Mathematics
subject: 60J65 (Primary) 60G40, 60J60 (Secondary)

description: We calculate crossing probabilities and one-sided last exit time densities for a class of moving barriers on an interval $[0,T]$ via Schwartz distributions. We derive crossing probabilities and first hitting time densities for another class of barriers on $[0,T]$ by proving a Schwartz distribution version of the method of images. Analytic expressions for crossing probabilities and related densities are given for new explicit and semi-explicit barriers.
description: Published in at http://dx.doi.org/10.1214/07-AAP488 the Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Extragalactic 85Rb/87Rb and 6Li/7Li ratios in the Small Magellanic Cloud
Creators: name: Molaro, P.
name: Bonifacio, P.
name: Cupani, G.
name: Howk, C.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The line of sight toward Sk 143 (AzV 456), an O9.5 Ib star in the Small Magellanic Cloud (SMC), shows significant absorption from neutral atoms and molecules. We report a new study of this line of sight by means of high-resolution spectra obtained with the ESPRESSO spectrograph at the VLT of ESO. The absorption from neutral and ionized species is well characterized by a single component at vhel about +132 km/s that was modeled with the ASTROCOOK code. The rubidium Rb I 780.0 nm line is detected for the first time outside the Galaxy, and we derive [Rb/H]= -1.86 +/- 0.09. As a result of the high resolution, the 85Rb and 87Rb isotope lines are also exceptionally well resolved. The 85Rb/87Rb isotope ratio is 0.46, which is opposite of the meteoritic value of 2.43. This implies that Rb is made through a dominant contribution of the r-process, which is dominant for the 87Rb isotope. We also confirm the presence of 7LiI 670.7 nm and set a limit on the isotopic ratio of 6Li/7Li < 0.1.The dominance of the 87Rb isotope implies that Rb is made through a dominant contribution of the r-process. At the low metallicity of the cloud of [Zn/H] = -1.28 +/- 0.09 , neutron rich material may have occurred in rotating metal-poor massive stars. Moreover, the low metallicity of the cloud leads to an absolute Li abundance of A(7Li) about 2.2, which differs from the expectation from big bang nucleosynthesis. Because the gas-phase abundance is not affected by stellar depletion, the burning of Li inside the halo stars is probably not the solution for the cosmological 7Li problem.
description: 9 pages,3 figures, 2 Tables. Accepted A&A
Diffusive and ballistic current spin-polarization in magnetron-sputtered L1o-ordered epitaxial FePt
Creators: name: Seemann, K. M.
name: Baltz, V.
name: MacKenzie, M.
name: Chapman, J. N.
name: Hickey, B. J.
name: Marrows, C. H.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report on the structural, magnetic, and electron transport properties of a L1o-ordered epitaxial iron-platinum alloy layer fabricated by magnetron-sputtering on a MgO(001) substrate. The film studied displayed a long range chemical order parameter of S~0.90, and hence has a very strong perpendicular magnetic anisotropy. In the diffusive electron transport regime, for temperatures ranging from 2 K to 258 K, we found hysteresis in the magnetoresistance mainly due to electron scattering from magnetic domain walls. At 2 K, we observed an overall domain wall magnetoresistance of about 0.5 %. By evaluating the spin current asymmetry alpha = sigma_up / sigma_down, we were able to estimate the diffusive spin current polarization. At all temperatures ranging from 2 K to 258 K, we found a diffusive spin current polarization of > 80%. To study the ballistic transport regime, we have performed point-contact Andreev-reflection measurements at 4.2 K. We obtained a value for the ballistic current spin polarization of ~42% (which compares very well with that of a polycrystalline thin film of elemental Fe). We attribute the discrepancy to a difference in the characteristic scattering times for oppositely spin-polarized electrons, such scattering times influencing the diffusive but not the ballistic current spin polarization.
description: 22 pages, 13 figures
Systematics of threshold incident energy for deep sub-barrier fusion hindrance
Creators: name: Ichikawa, Takatoshi
name: Hagino, Kouichi
name: Iwamoto, Akira
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We systematically evaluate the potential energy at the touching configuration for heavy-ion reactions using various potential models. We point out that the energy at the touching point, especially that estimated with the Krappe-Nix-Sierk (KNS) potential, strongly correlates with the threshold incident energy for steep fall-off of fusion cross sections observed recently for several systems at extremely low energies. This clearly indicates that the steep fall-off phenomenon can be attributed to the dynamics after the target and projectile touch with each other, e.g., the tunneling process and the nuclear saturation property in the overlap region.
description: 5 pages, 3 figures
Improvement of analysis for relaxation of fluctuations by the use of Gaussian process regression and extrapolation method
Creators: name: Osada, Yuma
name: Ozeki, Yukiyasu
Publisher: name: arXiv
Year: 2024
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The nonequilibrium relaxation (NER) method, which has been used to investigate equilibrium systems via their nonequilibrium behavior, has been widely applied to various models to estimate critical temperatures and critical exponents. Although the estimation of critical temperatures has become more reliable and reproducible, that of critical exponents raises concerns about the method's reliability. Therefore, we propose a more reliable and reproducible approach using Gaussian process regression. In addition, the present approach introduces statistical errors through the bootstrap method by combining them using the extrapolation method. Our estimation for the two-dimensional Ising model yielded $β= 0.12504(6)$, $γ= 1.7505(10)$, and $ν= 1.0003(6)$, consistent with the exact values. The value $z = 2.1669(9)$ is reliable because of the high accuracy of these exponents. We also obtained the critical exponents for the three-dimensional Ising model and found that they are close to those reported in a previous study. Thus, for systems undergoing second-order transitions, our approach improves the accuracy, reliability, and reproducibility of the NER analysis. Because the proposed approach requires the relaxation of some observables from Monte Carlo simulations, its simplicity imparts it with significant potential.
description: 26 pages, 19 figures, LaTeX
Heiner Müller :bmotif:mask/metamorphosis, metaphor:theatricality/metatheatricality
Creators: name: Quint, Cordula
Publisher: name: University of British Columbia
Year: 2010

description: The late postmodern texts by East-German playwright Heiner Muller are intricately structured historical-mythological montages characterized by an insurgent fragmentation of 'dramatic action' and a cryptic density of verbal and visual metaphorization. Indeed, Muller's radical dramaturgical approach has been described as the 'poetics of destruction’, a term which pertains to the dramatist's own theories about the contemporary exigencies of maintaining the vital social and political function of the theater. Texts such as Die Hamletmaschine are frequently evaluated as incoherent and abstruse disfigurements of the original from which they are derived. It is the purpose of this study to examine two closely related plays of Muller's late canon -- Die Hamletmaschine (1977) and Der Auftrag (1979) -- and to reveal the striking consistency and coherence of the postmodern dramatist's transposition of a fourfold motif-cluster from Shakespeare's Hamlet. However, the author's exegetical analyses aim not only at an investigation of Muller's postmodern aesthetical aberrations. They reveal, moreover, how the Shakespearean motif-cluster becomes the marxist's tool to assimilate the historical and political context of the late 1970's from a marxist perspective. The two texts selected from Muller's canon investigate the possibility and the reasons for the failure of the socialist-marxist and the French revolutions. Concurrently, the two dramas focus on the 'authentic' role and function of the intellectual revolutionary in the historical process . The transposition of the "Shakespearean" theatrum-mundi metaphor, furthermore, allows Muller to integrate a coherent metatheatrical dimension into his plays. In Die Hamletmaschine, the dramatist contemplates the social and political function of the theater and of the 'intellectual' theater-maker within the contemporary historical context of 1977. In Der Auftrag, the metatheatrical dimension of the motif-cluster implicitly criticizes the political structure of the theater as an institution as well as the hierarchical mechanisms of conventional theater-making.
eROSITA (eRASS1) study of the Canis Major overdensity: Developing a multi-wavelength algorithm for classifying faint X-ray sources
Creators: name: Saeedi, Sara
name: Sasaki, Manami
name: Knies, Jonathan
name: Robrade, Jan
name: Heindl, Theresa
name: Zainab, Aafia
name: Hämmerich, Steven
name: Reh, Martin
name: Wilms, Joern
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Using the data of eROSITA (extended Roentgen Survey with an Imaging Telescope Array) on board Spektrum-Roentgen-Gamma (Spektr-RG, SRG) taken during the first eROSITA all-sky survey (eRASS1), we perform the first X-ray classification and population study in the field of Canis Major overdensity (CMa OD), which is an elliptical-shaped stellar overdensity located at l = -240, b = -80. The study aims to identify the X-ray sources in CMa OD. For this purpose, we developed a classification algorithm using multi-wavelength criteria as a preliminary method for the classification of faint X-ray sources, specifically in regions with a high source number density. Out of a total number of 8311 X-ray sources, we have classified 1029 sources as Galactic stars and binaries in the foreground, 946 sources as active galactic nuclei (AGN) and galaxies in the background, and 435 sources with stellar counterparts, which can belong to either the MW or CMa OD. Among the sources with a stellar counterpart, we have identified 34 symbiotic star candidates, plus 335 sources, of which the infrared counterparts have properties of M-giants in CMa OD. Moreover, there is a known high-mass X-ray binary (HMXB, 4U 0728-25) in the field of our study, which, according to the Gaia parallax of its companion, seems to be a member of CMa OD. There is also a recently detected transient low-mass X-ray binary (LMXB, SRGt J071522.1-191609), which can be a member of CMa OD based on its companion that is most likely highly absorbed and is thus located behind the Galactic disk. In addition, we present the X-ray luminosity function (XLF) of members and candidate members of CMa OD. It is dominated by sources with luminosities of < 2*10^32-10^33 erg/s in the energy range of 0.2-2.3 keV, which are expected to be either accreting white dwarfs or quiescent LMXBs.
description: paper is accepted for the publication in A&A on 09/07/2024
VLTI/GRAVITY Interferometric Measurements of Innermost Dust Structure Sizes around AGNs
Creators: name: GRAVITY Collaboration
name: Amorim, A.
name: Bourdarot, G.
name: Brandner, W.
name: Cao, Y.
name: Clénet, Y.
name: Davies, R.
name: de Zeeuw, P. T.
name: Dexter, J.
name: Drescher, A.
name: Eckart, A.
name: Eisenhauer, F.
name: Fabricius, M.
name: Feuchtgruber, H.
name: Schreiber, N. M. Förster
name: Garcia, P. J. V.
name: Genzel, R.
name: Gillessen, S.
name: Gratadour, D.
name: Hönig, S.
name: Kishimoto, M.
name: Lacour, S.
name: Lutz, D.
name: Millour, F.
name: Netzer, H.
name: Ott, T.
name: Perraut, K.
name: Perrin, G.
name: Peterson, B. M.
name: Petrucci, P. O.
name: Pfuhl, O.
name: Prieto, M. A.
name: Rabien, S.
name: Rouan, D.
name: Santos, D. J.
name: Shangguan, J.
name: Shimizu, T.
name: Sternberg, A.
name: Straubmeier, C.
name: Sturm, E.
name: Tacconi, L. J.
name: Tristram, K. R. W.
name: Widmann, F.
name: Woillez, J.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present new VLTI/GRAVITY near-infrared interferometric measurements of the angular size of the innermost hot dust continuum for 14 type 1 AGNs. The angular sizes are resolved on scales of ~0.7 mas and the inferred ring radii range from 0.028 to 1.33 pc, comparable to those reported previously and a factor 10-20 smaller than the mid-infrared sizes in the literature. Combining our new data with previously published values, we compile a sample of 25 AGN with bolometric luminosity ranging from $10^{42}$ to $10^{47} \rm erg~s^{-1}$, with which we study the radius-luminosity (R-L) relation for the hot dust structure. Our interferometric measurements of radius are offset by a factor 2 from the equivalent relation derived through reverberation mapping. Using a simple model to explore the dust structure's geometry, we conclude that this offset can be explained if the 2 um emitting surface has a concave shape. Our data show that the slope of the relation is in line with the canonical $R \propto L^{0.5}$ when using an appropriately non-linear correction for bolometric luminosity. In contrast, using optical luminosity or applying a constant bolometric correction to it results in a significant deviation in the slope, suggesting a potential luminosity dependence on the spectral energy distribution. Over four orders of magnitude in luminosity, the intrinsic scatter around the R-L relation is 0.2 dex, suggesting a tight correlation between innermost hot dust structure size and the AGN luminosity.
description: 14 pages, 5 figures, 4 tables, accepted for publication in A&A
The dynamic evolution of swelling in nickel concentrated solid solution alloys through in situ property monitoring
Creators: name: Dennett, Cody A.
name: Dacus, Benjamin R.
name: Barr, Christopher M.
name: Clark, Trevor
name: Bei, Hongbin
name: Zhang, Yanwen
name: Short, Michael P.
name: Hattar, Khalid
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Defects and microstructural features spanning the atomic level to the microscale play deterministic roles in the expressed properties of materials. Yet studies of material evolution in response to environmental stimuli most often correlate resulting performance with one dominant microstructural feature only. Here, the dynamic evolution of swelling in a series of Ni-based concentrated solid solution alloys under high-temperature irradiation exposure is observed using continuous, in situ measurements of thermoelastic properties in bulk specimens. Unlike traditional evaluation techniques which account only for volumetric porosity identified using electron microscopy, direct property evaluation provides an integrated response across all defect length scales. In particular, the evolution in elastic properties during swelling is found to depend significantly on the entire size spectrum of defects, from the nano- to meso-scales, some of which are not resolvable in imaging. Observed changes in thermal transport properties depend sensitively on the partitioning of electronic and lattice thermal conductivity. This emerging class of in situ experiments, which directly measure integrated performance in relevant conditions, provides unique insight into material dynamics otherwise unavailable using traditional methods.
description: 15 pages, 4 figures, 6 supplementary figures; accepted manuscript
Broadband-laser-diode pumped PPKTP-Sagnac polarization-entangled photon source
Creators: name: Cai, Neng
name: Cai, Wu-Hao
name: Wang, Shun
name: Li, Fang
name: Shimizu, Ryosuke
name: Jin, Rui-Bo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We experimentally demonstrate a polarization-entangled photon source at 810 nm using a type-II phase-matched PPKTP crystal pumped by a low-cost, broadband laser diode with a central wavelength of 405 nm and a typical bandwidth of 0.53 nm. The PPKTP crystal is placed in a Sagnac-loop to realize the compact size and high stability. The downconverted biphotons, the signal and the idler, have typical bandwidths of 5.57 nm and 7.32 nm. We prepare two Bell states |Psi+> and |Psi-> with the fidelities of 0.948+-0.004 and 0.963+-0.002. In polarization correlation measurement, the visibilities are all higher than 96.2%, and in the Bell inequality test, the S value can achieve 2.78+-0.01. To our knowledge, this experiment is the first to combine a multi-mode pump laser with a Sagnac-loop configuration. This high-quality and low-cost entangled photon source may have many practical applications in quantum information processing.
description: 8 pages, 6 figures
Measuring gluon shadowing with prompt photons at RHIC and LHC
Creators: name: Arleo, Francois
name: Gousset, Thierry
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The possibility to observe the nuclear modification of the gluon distribution at small-x (gluon shadowing) using high-p_T prompt photon production at RHIC and at LHC is discussed. The per-nucleon ratio, sigma(p+A -> gamma+X) / A sigma(p+p -> gamma+X), is computed for both inclusive and isolated prompt photons in perturbative QCD at NLO using different parametrizations of nuclear parton densities, in order to assess the visibility of the shadowing signal. The production of isolated photons turns out to be a promising channel which allows for a reliable extraction of the gluon density, G^A/G^p, and the structure function, F_2^A/F_2^p, in a nucleus over that in a proton. Moreover, the production ratio of prompt photons at forward-over-backward rapidity in p-A collisions provides an estimate of G^A/G^p (at small x) over F_2^A/F_2^p (at large x), without the need of p-p reference data at the same energy.
description: 14 pages, 6 figures. Typo corrected in Eq. (4)
Extrinsic Size Effect in Piezoresponse Force Microscopy of Thin Films
Creators: name: Morozovska, Anna N.
name: Svechnikov, Sergei V.
name: Eliseev, Eugene A.
name: Kalinin, Sergei V.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The extrinsic size effect in Piezoresponse Force Microscopy of ferroelectric and piezoelectric thin films on non-polar dielectric substrate is analyzed. Analytical expressions for effective piezoresponse, object transfer function components, and Rayleigh two-point resolution are obtained. These results can be broadly applied for effective piezoelectric response calculations in thin piezoelectric and ferroelectric films as well as surface polar layers e.g. in organic materials and bio-polymers. In particular, the effective piezoresponse strongly decreases with film thickness whereas the sharpness of domain stripes image increases due to the object transfer function spectrum broadening.
description: 16 pages, 5 figures; To be submitted to Phys. Rev. B-Rapid Communications
Analytic structure of diffusive correlation functions
Creators: name: Grozdanov, Sašo
name: Lemut, Timotej
name: Pelaič, Jaka
name: Soloviev, Alexander
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Diffusion is a dissipative transport phenomenon ubiquitously present in nature. Its details can now be analysed with modern effective field theory (EFT) techniques that use the closed-time-path (or Schwinger-Keldysh) formalism. We discuss the structure of the diffusive effective action appropriate for the analysis of stochastic or thermal loop effects, responsible for the so-called long-time tails, to all orders. We also elucidate and prove a number of properties of the EFT and use the theory to establish the analytic structure of the $n$-loop contributions to diffusive retarded two-point functions. Our analysis confirms a previously proposed result by Delacrétaz that used microscopic conformal field theory arguments. Then, we analyse a number of implications of these loop corrections to the dispersion relations of the diffusive mode and new, gapped modes that appear when the EFT is treated as exact. Finally, we discuss certain features of an all-loop model of diffusion that only retains a special subset of $n$-loop `banana' diagrams.
description: 13 pages, 7 figures
The end-to-end simulator of the ATHENA X-IFU Cryogenic AntiCoincidence detector (CryoAC)
Creators: name: D'Andrea, Matteo
name: Macculi, Claudio
name: Lotti, Simone
name: Piro, Luigi
name: Argan, Andrea
name: Minervini, Gabriele
name: Torrioli, Guido
name: Chiarello, Fabio
name: Barusso, Lorenzo Ferrari
name: Gatti, Flavio
name: Rigano, Manuela
Publisher: name: arXiv
Year: 2024
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The X-IFU is one of the two instruments of ATHENA, the next ESA large X-ray observatory. It is a cryogenic spectrometer based on an array of TES microcalorimeters. To reduce the particle background, the TES array works in combination with a Cryogenic AntiCoincidence detector (CryoAC). The CryoAC is a 4-pixel detector, based on ~1 cm2 silicon absorbers sensed by Ir/Au TES. It is required to have a wide energy bandwidth (from 20 keV to ~1 MeV), high efficiency (< 0.014% missed particles), low dead-time (< 1%) and good time-tagging accuracy (10 us at 1 sigma). An end-to-end simulator of the CryoAC detector has been developed both for design and performance assessment, consisting of several modules. First, the in-flight flux of background particles is evaluated by Geant4 simulations. Then, the current flow in the TES is evaluated by solving the electro-thermal equations of microcalorimeters, and the detector output signal is generated by simulating the SQUID FLL dynamics. Finally, the output is analyzed by a high-efficiency trigger algorithm, producing the simulated CryoAC telemetry. Here, we present in detail this end-to-end simulator, and how we are using it to define the new CryoAC baseline configuration in the new Athena context.
description: Proceeding of the SPIE Astronomical Telescopes + Instrumentation 2024
Bayesian self-calibration and imaging in Very Long Baseline Interferometry
Creators: name: Kim, Jong-Seo
name: Nikonov, Aleksei S.
name: Roth, Jakob
name: Ensslin, Torsten A.
name: Janssen, Michael
name: Arras, Philipp
name: Mueller, Hendrik
name: Lobanov, Andrei P.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Self-calibration methods with the CLEAN algorithm have been widely employed in Very Long Baseline Interferometry (VLBI) data processing in order to correct antenna-based amplitude and phase corruptions present in the data. However, human interaction during the conventional CLEAN self-calibration process can impose a strong effective prior, which in turn may produce artifacts within the final image and hinder the reproducibility of final results. In this work, we aim to demonstrate a combined self-calibration and imaging method for VLBI data in a Bayesian inference framework. The method corrects for amplitude and phase gains for each antenna and polarization mode by inferring the temporal correlation of the gain solutions. We use Stokes I data of M87 taken with the Very Long Baseline Array (VLBA) at 43GHz, pre-calibrated using the rPICARD CASA-based pipeline. For antenna-based gain calibration and imaging, we use the Bayesian imaging software resolve. To estimate gain and image uncertainties, we use a Variational Inference method. We obtain a high-resolution M87 Stokes I image at 43GHz in conjunction with antenna-based gain solutions using our Bayesian self-calibration and imaging method. The core with counter-jet structure is better resolved, and extended jet emission is better described compared to the CLEAN reconstruction. Furthermore, uncertainty estimation of the image and antenna-based gains allows us to quantify the reliability of the result. Our Bayesian self-calibration and imaging method is able to reconstruct robust and reproducible Stokes I images and gain solutions with uncertainty estimation by taking into account the uncertainty information in the data.
description: accepted for publication in A&A
Quantum critical scaling in graphene
Creators: name: Sheehy, Daniel E.
name: Schmalian, Joerg
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We show that the emergent relativistic symmetry of electrons in graphene near its quantum critical point (QCP) implies a crucial importance of the Coulomb interaction. We derive scaling laws, valid near the QCP, that dictate the nontrivial magnetic and charge response of interacting graphene. Our analysis yields numerous predictions for how the Coulomb interaction will be manifested in experimental observables such as the diamagnetic response and electronic compressibility.
description: 4 pages, 2 figures. Published version
Electric trapping and circuit cooling of charged nanorotors
Creators: name: Martinetz, Lukas
name: Hornberger, Klaus
name: Stickler, Benjamin A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: The motion of charged particles can be interfaced with electric circuitry via the current induced in nearby pick-up electrodes. Here we show how the rotational and translational dynamics of levitated objects with arbitrary charge distributions can be coupled to a circuit and how the latter acts back on the particle motion. The ensuing cooling rates in series and parallel RLC circuits are determined, demonstrating that quadrupole ion traps are well suited for implementing all-electric cooling. We derive the effective macromotion potential for general trap geometries and demonstrate numerically how consecutive rotational and translational resistive cooling of a microscale particle can be achieved in linear Paul traps.
description: 23 pages, 6 figures
Viologen-based supramolecular crystal gels: gelation kinetics and sensitivity to temperature
Creators: name: Bauland, Julien
name: Andrieux, Vivien
name: Pignon, Frédéric
name: Frath, Denis
name: Bucher, Christophe
name: Gibaud, Thomas
Publisher: name: arXiv
Year: 2024
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Supramolecular crystal gels, a subset of molecular gels, form through self-assembly of low molecular weight gelators into interconnecting crystalline fibers, creating a three-dimensional soft solid network. This study focuses on the formation and properties of viologen-based supramolecular crystalline gels. It aims to answer key questions about the tunability of network properties and the origin of these properties through in-depth analyses of the gelation kinetics triggered by thermal quenching. Experimental investigations, including UV-Vis absorption spectroscopy, rheology, microscopy and scattering measurements, contribute to a comprehensive and self-consistent understanding of the system kinetics. We confirm that the viologen-based gelators crystallize by forming nanometer radius hollow tube that assemble into micro to millimetric spherulites. We then show that the crystallization follows the Avrami theory and is based on pre-existing nuclei. We also establish that the growth is interface controlled leading to the hollow tubes to branch into spherulites with fractal structures. Finally, we demonstrate that the gel properties can be tuned depending on the quenching temperature. Lowering the temperature results in the formation of denser and smaller spherulites. In contrast, the gels elasticity is not significantly affected by the quench temperature, leading us to hypothesize that the spherulites densification occurs at the expense of the connectivity between spherulite.
Low-Energy Electrodynamics of Heavy Quasiparticles in ZrZn2
Creators: name: Kimura, Shin-ichi
name: Kimura, Noriaki
name: Aoki, Haruyoshi
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The temperature dependence of the optical conductivity spectrum of an itinerant ferromagnetic material, ZrZn$_2$, was obtained and the dynamical effective mass and the scattering rate were derived. A renormalized Drude peak with a heavy effective mass developed at low temperatures. The effective mass rapidly increased below $\hbarω$ = 10 meV and at 10 K it was observed to be 3 times heavier than that at 300 K. The scattering rate also rapidly decreased below 10 meV at 10 K. These results indicate the creation of heavy quasiparticles at low temperatures due to spin fluctuations.
description: 5 pages, 5 figures
Sobolev neural network with residual weighting as a surrogate in linear and non-linear mechanics
Creators: name: Kilicsoy, A. O. M.
name: Liedmann, J.
name: Valdebenito, M. A.
name: Barthold, F. -J.
name: Faes, M. G. R.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Areas of computational mechanics such as uncertainty quantification and optimization usually involve repeated evaluation of numerical models that represent the behavior of engineering systems. In the case of complex nonlinear systems however, these models tend to be expensive to evaluate, making surrogate models quite valuable. Artificial neural networks approximate systems very well by taking advantage of the inherent information of its given training data. In this context, this paper investigates the improvement of the training process by including sensitivity information, which are partial derivatives w.r.t. inputs, as outlined by Sobolev training. In computational mechanics, sensitivities can be applied to neural networks by expanding the training loss function with additional loss terms, thereby improving training convergence resulting in lower generalisation error. This improvement is shown in two examples of linear and non-linear material behavior. More specifically, the Sobolev designed loss function is expanded with residual weights adjusting the effect of each loss on the training step. Residual weighting is the given scaling to the different training data, which in this case are response and sensitivities. These residual weights are optimized by an adaptive scheme, whereby varying objective functions are explored, with some showing improvements in accuracy and precision of the general training convergence.
description: Submitted to IEEE Access, 40 pages, 18 figures
Fast Single-Charge Sensing with an rf Quantum Point Contact
Creators: name: Reilly, D. J.
name: Marcus, C. M.
name: Hanson, M. P.
name: Gossard, A. C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We report high-bandwidth charge sensing measurements using a GaAs quantum point contact embedded in a radio frequency impedance matching circuit (rf-QPC). With the rf-QPC biased near pinch-off where it is most sensitive to charge, we demonstrate a conductance sensitivity of 5x10^(-6) e^(2)/h Hz^(-1/2) with a bandwidth of 8 MHz. Single-shot readout of a proximal few-electron double quantum dot is investigated in a mode where the rf-QPC back-action is rapidly switched.
description: related papers available at http://marcuslab.harvard.edu
White-light parametric instabilities in plasmas
Creators: name: Santos, J. E.
name: Silva, L. O.
name: Bingham, R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Parametric instabilities driven by partially coherent radiation in plasmas are described by a generalized statistical Wigner-Moyal set of equations, formally equivalent to the full wave equation, coupled to the plasma fluid equations. A generalized dispersion relation for Stimulated Raman Scattering driven by a partially coherent pump field is derived, revealing a growth rate dependence, with the coherence width $σ$ of the radiation field, scaling with $1/σ$ for backscattering (three-wave process), and with $1/σ^{1/2}$ for direct forward scattering (four-wave process). Our results demonstrate the possibility to control the growth rates of these instabilities by properly using broadband pump radiation fields.
description: 6 pages, 3 figures, accepted for publication in Phys. Rev. Lett