cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
F. Rakob — W. D. Heilmeyer, Der Rundtempel am Tiber in Rom
Creators: name: Polaschek, Karin
Publisher: name: Trierer Zeitschrift - Archäologie und Kunst des Trierer Landes und seiner Nachbargebiete
Year: 2023

description: Rezension zu: F. Rakob — W. D. Heilmeyer, Der Rundtempel am Tiber in Rom (mit einer Bauaufnahme von W. Niemann und einem Beitrag von P. A. Gianfrotta). Deutsches Archäologisches Institut Rom. Sonderschriften 2 (Mainz 1973), 48 S., 60 Tafeln mit 188 Abbildungen, 23 Beilagen
description: Trierer Zeitschrift - Archäologie und Kunst des Trierer Landes und seiner Nachbargebiete, Bd. 37 (1974): Trierer Zeitschrift : für Geschichte und Kunst des Trierer Landes und seiner Nachbargebiete
Representations of quantum superalgebra Uq[gl(2|1)] in a coherent state basis and generalization
Creators: name: Kien, Nguyen Cong
name: Ky, Nguyen Anh
name: Nam, Le Ba
name: Van, Nguyen Thi Hong
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Quantum Algebra (math.QA)
subject: Representation Theory (math.RT)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: The coherent state method has proved to be useful in quantum physics and mathematics. This method, more precisely, the vector coherent state method, has been used by some authors to construct representations of superalgebras but almost, to our knowledge, it has not yet been extended to quantum superalgebras, except $U_q[osp(1|2)]$, one of the smallest quantum superalgebras. In this article the method is applied to a bigger quantum superalgebra, namely $U_q[gl(2|1)]$, in constructing $q$--boson-fermion realizations and finite-dimensional representations which, when irreducible, are classified into typical and nontypical representations. This construction leads to a more general class of $q$--boson-fermion realizations and finite-dimensional representations of $U_q[gl(2|1)]$ and, thus, at $q=1$, of $gl(2|1)$. Both $gl(2|1)$ and $U_q[gl(2|1)]$ have found different physics applications, therefore, it is meaningful to construct their representations.
description: 16 pages, LaTeX, no figure. V2: A reference corrected
Pairing: from atomic nuclei to neutron-star crusts
Creators: name: Chamel, N.
name: Pearson, J. M.
name: Goriely, S.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Nuclear pairing is studied both in atomic nuclei and in neutron-star crusts in the unified framework of the energy-density functional theory using generalized Skyrme functionals complemented with a local pairing functional obtained from many-body calculations in homogeneous nuclear matter using realistic forces.
description: 16 pages, 3 figures. Contribution for the book "50 years of nuclear BCS", edited by R.A. Broglia and V. Zelevinsky
Non Gaussian extrema counts for CMB maps
Creators: name: Pogosyan, Dmitri
name: Pichon, Christophe
name: Gay, Christophe
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: In the context of the geometrical analysis of weakly non Gaussian CMB maps, the 2D differential extrema counts as functions of the excursion set threshold is derived from the full moments expansion of the joint probability distribution of an isotropic random field, its gradient and invariants of the Hessian. Analytic expressions for these counts are given to second order in the non Gaussian correction, while a Monte Carlo method to compute them to arbitrary order is presented. Matching count statistics to these estimators is illustrated on fiducial non-Gaussian "Planck" data.
description: 4 pages, 1 figure
Formation and Hardening of Supermassive Black Hole Binaries in Minor Mergers of Disk Galaxies
Creators: name: Khan, Fazeel Mahmood
name: Berentzen, Ingo
name: Berczik, Peter
name: Just, Andreas
name: Mayer, Lucio
name: Nitadori, Keigo
name: Callegari, Simone
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We model for the first time the complete orbital evolution of a pair of Supermassive Black Holes (SMBHs) in a 1:10 galaxy merger of two disk dominated gas-rich galaxies, from the stage prior to the formation of the binary up to the onset of gravitational wave emission when the binary separation has shrunk to 1 milli parsec. The high-resolution smoothed particle hydrodynamics (SPH) simulations used for the first phase of the evolution include star formation, accretion onto the SMBHs as well as feedback from supernovae explosions and radiative heating from the SMBHs themselves. Using the direct N-body code ϕ-GPU we evolve the system further without including the effect of gas, which has been mostly consumed by star formation in the meantime. We start at the time when the separation between two SMBHs is ~ 700 pc and the two black holes are still embedded in their galaxy cusps. We use 3 million particles to study the formation and evolution of the SMBH binary till it becomes hard. After a hard binary is formed, we reduce (reselect) the particles to 1.15 million and follow the subsequent shrinking of the SMBH binary due to 3-body encounters with the stars. We find approximately constant hardening rates and that the SMBH binary rapidly develops a high eccentricity. Similar hardening rates and eccentricity values are reported in earlier studies of SMBH binary evolution in the merging of dissipation-less spherical galaxy models. The estimated coalescence time is ~ 2.9 Gyr, significantly smaller than a Hubble time. We discuss why this timescale should be regarded as an upper limit. Since 1:10 mergers are among the most common interaction events for galaxies at all cosmic epochs, we argue that several SMBH binaries should be detected with currently planned space-borne gravitational wave interferometers, whose sensitivity will be especially high for SMBHs in the mass range considered here.
description: 9 pages, 11 figures, submitted to ApJ
State transfer in dissipative and dephasing environments
Creators: name: Hu, Ming-Liang
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: By diagonalization of a generalized superoperator for solving the master equation, we investigated effects of dissipative and dephasing environments on quantum state transfer, as well as entanglement distribution and creation in spin networks. Our results revealed that under the condition of the same decoherence rate $γ$, the detrimental effects of the dissipative environment are more severe than that of the dephasing environment. Beside this, the critical time $t_c$ at which the transfer fidelity and the concurrence attain their maxima arrives at the asymptotic value $t_0=π/2λ$ quickly as the spin chain length $N$ increases. The transfer fidelity of an excitation at time $t_0$ is independent of $N$ when the system subjects to dissipative environment, while it decreases as $N$ increases when the system subjects to dephasing environment. The average fidelity displays three different patterns corresponding to $N=4r+1$, $N=4r-1$ and $N=2r$. For each pattern, the average fidelity at time $t_0$ is independent of $r$ when the system subjects to dissipative environment, and decreases as $r$ increases when the system subjects to dephasing environment. The maximum concurrence also decreases as $N$ increases, and when $N\rightarrow\infty$, it arrives at an asymptotic value determined by the decoherence rate $γ$ and the structure of the spin network.
description: 12 pages, 6 figures
CoAct D8.3: Interim Report on communication, dissemination and exploitation activities
Creators: name: Sandres, Ana
name: Wissenbach, Kersti
Publisher: name: Zenodo
Year: 2021
Subjects: CoAct
Citizen Social Science

description: DISCLAIMER: The present Project Deliverable has been submitted to the European Commission for review. The information and views set out in this report are those of the author(s) and do not necessarily reflect the official opinion of the European Union. Neither the European Union institutions and bodies nor any person acting on their behalf may be held responsible for the use which may be made of the information contained therein. This deliverable gives an overview of the communication and dissemination activities of the CoAct consortium in the first 18 months of the project duration, which are activities under continuous reporting and monitoring of the WP8 lead by GIG. Communication and dissemination activities are carried out according to the Communication, Dissemination and Exploitation Plan (Deliverable D8.1) which included objectives, target groups, and outreach and engagement tools, channels and tactics. Every 6-months partners report on their communication and dissemination activities in a template developed for this purpose. This document analyses CoAct activities carried out in the first 18 months of the project, specifically those related to the channels and tools that have been used to communicate the project and disseminate its results, as well as presenting WP8 progress based on the key performance indicators related to communication and dissemination activities.
Cosmic-Ray Induced Diffuse Emissions from the Milky Way and Local Group Galaxies
Creators: name: Porter, Troy A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Cosmic rays fill up the entire volume of galaxies, providing an important source of heating and ionisation of the interstellar medium, and may play a significant role in the regulation of star formation and galactic evolution. Diffuse emissions from radio to high-energy gamma rays (> 100 MeV) arising from various interactions between cosmic rays and the interstellar medium, interstellar radiation field, and magnetic field, are currently the best way to trace the intensities and spectra of cosmic rays in the Milky Way and other galaxies. In this contribution, I describe our recent work to model the full spectral energy distribution of galaxies like the Milky Way from radio to gamma-ray energies. The application to other galaxies, in particular the Magellanic Clouds and M31 that are detected in high-energy gamma-rays by the Fermi-LAT, is also discussed.
description: Contribution to "The Spectral Energy Distribution of Galaxies" Proceedings IAU Symposium No. 284, 2011, eds. R.J. Tuffs & C.C.Popescu. 4 pages with 4 figures
CoActD4.3: Inclusive Toolbox for Citizen Social Science
Creators: name: Wintersteller, Teresa
Publisher: name: Zenodo
Year: 2022
Subjects: CoAct
Citizen Social Science

description: DISCLAIMER: The present Project Deliverable has been submitted to the European Commission for review. The information and views set out in this report are those of the author(s) and do not necessarily reflect the official opinion of the European Union. Neither the European Union institutions and bodies nor any person acting on their behalf may be held responsible for the use which may be made of the information contained therein. CoAct (Co-designing Citizen Social Science for Collective Action) proposes a new understanding of Citizen Social Science (CSS) as participatory research co-designed and directly driven by citizens and citizen groups who share a social concern. As part of this project, the R&I Action on Youth Employment is conducting participatory research with young people in Vienna, Austria, who are taking part in educational measures within the framework of Education and Training up to 18 (E&T up to 18). Based on this collaborative research, the Inclusive Toolbox for Citizen Social Science was developed by the research team at the Department of Education of the University of Vienna. Its target group is young people who can use the Toolbox without the assistance of scientists or adult trainers. The Toolbox consists of two tools as a means for making social science research on education and employment experiential for adolescents and young adults. The first tool is a game playable via the app Actionbound. It offers a step-by-step guide through a small social science research process: finding a research topic, posing questions and doing initial research, collecting data and analysing it, and handling issues about disseminating the findings. The second tool is a board game that allows young people to learn and experience social research through the game. It incorporates aspects of social science research (such as collecting data, coding, and doing research) and introduces information and research results concerning education and employment. The game is based on the co-research process with young people in R&I Action #2. This Deliverable D4.3 Inclusive Toolbox for Citizen Social Science describes the tools of the Toolbox, the development processes as well as includes practical examples and reflections.
Führer zu vor- und frühgeschichtlichen Denkmälern: Hohenloher Land, Öhringen, Jagsthausen, Künzelsau, Langenburg
Creators: name: Polaschek, Karin
Publisher: name: Trierer Zeitschrift - Archäologie und Kunst des Trierer Landes und seiner Nachbargebiete
Year: 2023

description: Rezension zu: Führer zu vor- und frühgeschichtlichen Denkmälern: Hohenloher Land, Öhringen, Jagsthausen, Künzelsau, Langenburg. Bd. 24 (Mainz 1973), 229 S., 110 Abb. — Göttingen und das Göttinger Becken. Bd. 16 (Mainz 1970), 208 S., 78 Abb.
description: Trierer Zeitschrift - Archäologie und Kunst des Trierer Landes und seiner Nachbargebiete, Bd. 37 (1974): Trierer Zeitschrift : für Geschichte und Kunst des Trierer Landes und seiner Nachbargebiete
Systematic Low-Energy Effective Field Theory for Magnons and Holes in an Antiferromagnet on the Honeycomb Lattice
Creators: name: Kämpfer, F.
name: Bessire, B.
name: Wirz, M.
name: Hofmann, C. P.
name: Jiang, F. -J.
name: Wiese, U. -J.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Based on a symmetry analysis of the microscopic Hubbard and t-J models, a systematic low-energy effective field theory is constructed for hole-doped antiferromagnets on the honeycomb lattice. In the antiferromagnetic phase, doped holes are massive due to the spontaneous breakdown of the $SU(2)_s$ symmetry, just as nucleons in QCD pick up their mass from spontaneous chiral symmetry breaking. In the broken phase the effective action contains a single-derivative term, similar to the Shraiman-Siggia term in the square lattice case. Interestingly, an accidental continuous spatial rotation symmetry arises at leading order. As an application of the effective field theory we consider one-magnon exchange between two holes and the formation of two-hole bound states. As an unambiguous prediction of the effective theory, the wave function for the ground state of two holes bound by magnon exchange exhibits $f$-wave symmetry.
description: 33 pages, 6 figures
Production of entanglement with highly-mixed states
Creators: name: Kang, Minsu
name: Kim, M. S.
name: Jeong, Hyunseok
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study production of entanglement with highly-mixed states. We find that entanglement between highly mixed states can be generated via a direct unitary interaction even when both states have purities arbitrarily close to zero. This indicates that purity of a subsystem is not required for entanglement generation. Our result is in contrast to previous studies where the importance of the subsystem purity was emphasized.
description: 4 pages, 5 figures
On the algebra structure of some bismash products
Creators: name: Clarke, Matthew C.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Representation Theory (math.RT)
subject: Group Theory (math.GR)
subject: FOS: Mathematics

description: We study several families of semisimple Hopf algebras, arising as bismash products, which are constructed from finite groups with a certain specified factorization. First we associate a bismash product $H_q$ of dimension $q(q-1)(q+1)$ to each of the finite groups $PGL_2(q)$ and show that these $H_q$ do not have the structure (as algebras) of group algebras (except when $q =2,3$). As a corollary, all Hopf algebras constructed from them by a comultiplication twist also have this property and are thus non-trivial. We also show that bismash products constructed from Frobenius groups do have the structure (as algebras) of group algebras.
description: 11 pages
Accelerating an adiabatic process by nonlinear sweeping
Creators: name: Cao, Xingxin
name: Zhuang, Jun
name: Ning, X. -J.
name: Zhang, Wenxian
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate the acceleration of an adiabatic process with the same survival probability of the ground state by sweeping a parameter nonlinearly, fast in the wide gap region and slow in the narrow gap region, as contrast to the usual linear sweeping. We find the expected acceleration in the Laudau-Zener tunneling model and in the adiabatic quantum computing model for factorizing the number N=21.
description: 4 pages, 3 figures
Spätrömische Gardehelme, herausgegeben von H. Klumbach in Verbindung mit W. C. Braat, M. Manojlovic-Marijanski, K. M. Skalon und E. B. Thomas
Creators: name: Cüppers, Heinz
Publisher: name: Trierer Zeitschrift - Archäologie und Kunst des Trierer Landes und seiner Nachbargebiete
Year: 2023

description: Rezension zu: Spätrömische Gardehelme, herausgegeben von H. Klumbach in Verbindung mit W. C. Braat, M. Manojlovic-Marijanski, K. M. Skalon und E. B. Thomas. Bayerische Akademie der Wissenschaften München — Römisch-Germanisches Zentralmuseum Mainz (C. H. Beck’sche Verlagsbuchhandlung München 1973)
description: Trierer Zeitschrift - Archäologie und Kunst des Trierer Landes und seiner Nachbargebiete, Bd. 37 (1974): Trierer Zeitschrift : für Geschichte und Kunst des Trierer Landes und seiner Nachbargebiete
Optimizing future dark energy surveys for model selection goals
Creators: name: Watkinson, Catherine
name: Liddle, Andrew R.
name: Mukherjee, Pia
name: Parkinson, David
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We demonstrate a methodology for optimizing the ability of future dark energy surveys to answer model selection questions, such as `Is acceleration due to a cosmological constant or a dynamical dark energy model?'. Model selection Figures of Merit are defined, exploiting the Bayes factor, and surveys optimized over their design parameter space via a Monte Carlo method. As a specific example we apply our methods to generic multi-fibre baryon acoustic oscillation spectroscopic surveys, comparable to that proposed for SuMIRe PFS, and present implementations based on the Savage-Dickey Density Ratio that are both accurate and practical for use in optimization. It is shown that whilst the optimal surveys using model selection agree with those found using the Dark Energy Task Force (DETF) Figure of Merit, they provide better informed flexibility of survey configuration and an absolute scale for performance; for example, we find survey configurations with close to optimal model selection performance despite their corresponding DETF Figure of Merit being at only 50% of its maximum. This Bayes factor approach allows us to interpret the survey configurations that will be good enough for the task at hand, vital especially when wanting to add extra science goals and in dealing with time restrictions or multiple probes within the same project.
description: 12 pages, 16 figures
Generalised interacting self-avoiding trails on the square lattice: phase diagram and critical behaviour
Creators: name: Foster, Damien P.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: A generalised model for interacting self-avoiding trails on the square lattice is presented and studied using numerical transfer matrix methods. The model differentiates between on-site double visits corresponding to collisions, and crossings. Rigidity is also included in the model. The model includes the Nienhuis O(n=0) model and the interacting self-avoiding trail model as special cases. It is shown that the generic type of collapse found is the same as the pure interacting self-avoiding trail model.
description: submitted Phys Rev E
AusBildung bis 18 aus der Sicht der Teilnehmenden. Veränderungswünsche für inklusivere Übergänge in (Aus)Bildungen
Creators: name: Wöhrer, Veronika
Publisher: name: Zenodo
Year: 2022
Subjects: Youth Employment
CoAct
Citizen Social Science

description: This presentation was held in 2022 at the conference "Bildungsforschung in und für Zeiten der Veränderung" (Educational research in and for times of change), organised by the Austrian Society for Research and Development in Education. It presents approaches and experiences from the co-research process with young people who participated in different measures of the "Education and Training up to 18" programme.
Characterizing Cosmic-Ray Propagation in Massive Star-Forming Regions: The Case of 30 Doradus and the Large Magellanic Cloud
Creators: name: Murphy, E. J.
name: Porter, T. A.
name: Moskalenko, I. V.
name: Helou, G.
name: Strong, A. W.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Using infrared, radio, and gamma-ray data,we investigate the propagation characteristics of cosmic-ray (CR) electrons and nuclei in the 30 Doradus (30\,Dor) star-forming region in the Large Magellanic Cloud (LMC) using a phenomenological model based on the radio-far-infrared correlation within galaxies. Employing a correlation analysis, we derive an average propagation length of \sim 100-140 pc for \sim 3 GeV CR electrons resident in 30 Dor from consideration of the radio and infrared data. Assuming that the observed gamma-ray emission towards 30 Dor is associated with the star-forming region, and applying the same methodology to the infrared and gamma-ray data, we estimate a \sim 20 GeV propagation length of 200-320 pc for the CR nuclei. This is approximately twice as large as for\sim 3 GeV CR electrons, corresponding to a spatial diffusion coefficient that is \sim 4 times higher, scaling as (R/GV)^δ with δ\approx 0.7-0.8 depending on the smearing kernel used in the correlation analysis. This value is in agreement with the results found by extending the correlation analysis to include \sim 70 GeV CR nuclei traced by the 3-10 GeV gamma-ray data (δ\approx 0.66+/-0.23). Using the mean age of the stellar populations in 30 Dor and the results from our correlation analysis, we estimate a diffusion coefficient D_{R} \approx 0.9-1.0 \times10^27 (R/GV)^{0.7} cm^2 s^-1. We compare the values of the CR electron propagation length and surface brightness for 30 Dor and the LMC as a whole with those of entire disk galaxies. We find that the trend of decreasing average CR propagation distance with increasing disk-averaged star formation activity holds for the LMC, and extends down to single star-forming regions, at least for the case of 30 Dor.
description: 11 pages, 6 figures, Accepted for publication in the Astrophysical Journal
Dynamic Clustering of Histogram Data Based on Adaptive Squared Wasserstein Distances
Creators: name: Irpino, Antonio
name: Verde, Rosanna
name: De Carvalho, Francisco de AT
Publisher: name: arXiv
Year: 2011
Subjects: subject: Statistics Theory (math.ST)
subject: Data Structures and Algorithms (cs.DS)
subject: Probability (math.PR)
subject: Methodology (stat.ME)
subject: Other Statistics (stat.OT)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: This paper deals with clustering methods based on adaptive distances for histogram data using a dynamic clustering algorithm. Histogram data describes individuals in terms of empirical distributions. These kind of data can be considered as complex descriptions of phenomena observed on complex objects: images, groups of individuals, spatial or temporal variant data, results of queries, environmental data, and so on. The Wasserstein distance is used to compare two histograms. The Wasserstein distance between histograms is constituted by two components: the first based on the means, and the second, to internal dispersions (standard deviation, skewness, kurtosis, and so on) of the histograms. To cluster sets of histogram data, we propose to use Dynamic Clustering Algorithm, (based on adaptive squared Wasserstein distances) that is a k-means-like algorithm for clustering a set of individuals into $K$ classes that are apriori fixed. The main aim of this research is to provide a tool for clustering histograms, emphasizing the different contributions of the histogram variables, and their components, to the definition of the clusters. We demonstrate that this can be achieved using adaptive distances. Two kind of adaptive distances are considered: the first takes into account the variability of each component of each descriptor for the whole set of individuals; the second takes into account the variability of each component of each descriptor in each cluster. We furnish interpretative tools of the obtained partition based on an extension of the classical measures (indexes) to the use of adaptive distances in the clustering criterion function. Applications on synthetic and real-world data corroborate the proposed procedure.
The Evolution of Radio Galaxies and X-ray Point Sources in Coma Cluster Progenitors Since z~1.2
Creators: name: Hart, Quyen N.
name: Stocke, John T.
name: Evrard, August E.
name: Ellingson, Erica E.
name: Barkhouse, Wayne A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Using Chandra imaging spectroscopy and Very Large Array (VLA) L-band radio maps, we have identified radio sources at P_{1.4GHz} >=5x10^{23} W Hz^{-1} and X-ray point sources (XPSs) at L_{0.3-8keV}>=5x10^{42} erg s^{-1} in L>L* galaxies in 12 high-redshift (0.40.4 cluster fields, the increased numbers and luminosities of the CRS radio galaxies and XPSs suggest a substantial (9-10 fold) increase in the heat injected into high redshift clusters by AGN compared to the present epoch.
description: 30 pages; 10 figures; 11 tables; Accepted for publication in ApJ
Quantum theory of frequency pulling in the cavity-QED microlaser
Creators: name: Hong, Hyun-Gue
name: An, Kyungwon
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: The spectrum of the cavity-QED microlaser/micromaser is expected to show distinctive features of the coherent light-matter interaction, which are obscured in the conventional Schawlow-Townes linewidth theory. However, the spectral studies has been limited to resonant atom-cavity interaction so far. Here we consider the dispersive interaction in the off-resonance case, from which we uncover a quantum frequency pulling effect in the microlaser/micromaser spectrum. We present a quantum theory of the spectrum which introduces the notion of a frequency-pulling distribution associated with the photon number. In contrast to the conventional laser, periodic variation of the mean frequency pulling is observed with increasing pump parameter and it is attributed to the strong atom-cavity coupling. The pulling distribution gives rise to a spectral broadening, which can be dominant over the non-dispersive broadening addressed in the previous works. We also developed a corresponding semiclassical theory and discuss how the introduction of the frequency shift fits in with the extended quantum theory.
description: 13 pages, 13 figures
NANTEN 12CO (J=1-0) observations around the star WR 55
Creators: name: Duronea, N. U.
name: Arnal, E. M.
name: Testori, J. C.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Context: A complete study of the molecular and ionized gas in the environs of the nebula RCW 78 around WR 55 is presented. Aims: The aim of this work is to investigate the spatial distribution, physical characteristics, and kinematical properties of the molecular gas linked to the galactic nebula RCW 78 to achieve a better understanding of its interaction with the star and with the ionized gas. Methods: This study was based on 12CO(1-0) fully sampled observations of a region of ~0.45° in size around the star WR 55 and the nebula RCW 78 obtained with the 4-m NANTEN telescope, radio continuum archival data at 1.4 and 4.85 GHz, obtained from SGPS and PMNRAO Southern Radio Survey, respectively, and available infrared MIPSGAL images at 24 microns. Results: A molecular gas component in the velocity range from ~ -58 to -45 km s-1, compatible with the velocity of the ionized gas, was found to be associated with the optical nebula. Adopting a distance of ~ 5 kpc, the mass of this molecular component is about 3.4 x 10^4 Msun. The analysis of the molecular data revealed the presence of a velocity gradient, in agreement with the Halpha line. New radiocontinuum flux density determinations confirm the thermal nature of RCW 78. This indicates that the ionized gas in RCW 78 arises from photoionization of the molecular gas component in the velocity range from -58 km s-1 to -45 km s-1. A molecular concentration at a velocity of -56.1 km s-1 (identified as C1) is very likely associated with the star HD 117797 and with a collection of candidate YSOs, lying at a distance of 3.9 kpc, while the rest of the molecular gas at velocities between -56 and -46 km s-1 constitute an incomplete ring-like structure which expands around WR 55 at a velocity of about ~ 5 km s-1. Mechanical energy and time requirements indicate that WR 55 is very capable of sustaining the expansion of the nebula.
description: 14 pages, 10 figures.Accepted for publication in A&A
Use Case on Using Repositories for Sensitive Data
Creators: name: Bellanger, Silke
name: Besmer, Christina
name: Kaufmann, Danielle
name: Lindenmann, Iris
name: Morger, Jennifer
name: Schreier, Gero
Publisher: name: Zenodo
Year: 2025
Subjects: Research Data Management
Qualitative Data
Personal Data
Data Protection
Repositories

description: These use cases are intended to assist researchers. The instructions in the text are not legally binding. If you have any questions about data protection, copyright, or other legal aspects, make sure to contact the relevant offices at your university.

There is a total of ten use cases on various topics:

Data Processing by Third Parties

Obtaining Informed Consent from Study Subjects

Information Security

Anonymization for Small Groups of Study Subjects

Reusing Personal Data

Public Figures

Using Repositories for Sensitive Data

SNSF Open-Research-Data Standards

Storage Duration

Presentations and Teaching

The use cases are linked on Zenodo and are under a CC BY-SA 4.0 license.

The use cases were developed collaboratively by the open science teams at the Basel and Bern University Libraries and the data protection officer of the University of Basel following a workshop on data protection and the anonymization of qualitative research data. The workshop took place on May 27, 2019.
Slowdown for time inhomogeneous branching Brownian motion
Creators: name: Fang, Ming
name: Zeitouni, Ofer
Publisher: name: arXiv
Year: 2012
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics

description: We consider the maximal displacement of one dimensional branching Brownian motion with (macroscopically) time varying profiles. For monotone decreasing variances, we show that the correction from linear displacement is not logarithmic but rather proportional to $T^{1/3}$. We conjecture that this is the worse case correction possible.
Preparation of two-particle total hyperfine spin singlet states via spin-changing dynamics
Creators: name: Huang, Chao-Chun
name: Chang, M. -S.
name: Yip, S. -K.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We present our proposals for generating total hyperfine spin zero state for two f=1 or two f=2 particles, starting from initial unentangled states. We show that our goal can be achieved by exploiting spin changing dynamics and quadratic Zeeman shifts with realistic choices of external magnetic fields and evolution time intervals.
description: 7 pages, 4 figures
Asymptotic behaviour of the S-stopped branching processes with countable state space
Creators: name: Kyrychynska, Iryna
name: Okhrin, Ostap
name: Yeleyko, Yaroslav
Publisher: name: arXiv
Year: 2011
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics
subject: 60J80

description: he starting process with countable number of types μ(t) generates a stopped branching process ξ(t). The starting process stops, by falling into the nonempty set S. It is assumed, that the starting process is subcritical, indecomposable and noncyclic. It is proved, that the extinction probability converges to the cyclic function with period 1.
Bistability and instability of dark-antidark solitons in the cubic-quintic nonlinear Schroedinger equation
Creators: name: Crosta, M.
name: Fratalocchi, A.
name: Trillo, S.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We characterize the full family of soliton solutions sitting over a background plane wave and ruled by the cubic-quintic nonlinear Schroedinger equation in the regime where a quintic focusing term represents a saturation of the cubic defocusing nonlinearity. We discuss existence and properties of solitons in terms of catastrophe theory and fully characterize bistability and instabilities of the dark-antidark pairs, revealing new mechanisms of decay of antidark solitons.
description: 8 pages, 10 figures, accepted in PRA
Engineering mesoscopic superpositions of superfluid flow
Creators: name: Hallwood, David W.
name: Brand, Joachim
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: Modeling strongly correlated atoms demonstrates the possibility to prepare quantum superpositions that are robust against experimental imperfections and temperature. Such superpositions of vortex states are formed by adiabatic manipulation of interacting ultracold atoms confined to a one-dimensional ring trapping potential when stirred by a barrier. Here, we discuss the influence of non-ideal experimental procedures and finite temperature. Adiabaticity conditions for changing the stirring rate reveal that superpositions of many atoms are most easily accessed in the strongly-interacting, Tonks-Girardeau, regime, which is also the most robust at finite temperature. NOON-type superpositions of weakly interacting atoms are most easily created by adiabatically decreasing the interaction strength by means of a Feshbach resonance. The quantum dynamics of small numbers of particles is simulated and the size of the superpositions is calculated based on their ability to make precision measurements. Experimental creation of strongly correlated and NOON-type superpositions with about 100 atoms seems feasible in the near future.
description: 10 pages, 6 figures
The spinorial representation of polarized light and Berry phase
Creators: name: Banerjee, Dipti
Publisher: name: arXiv
Year: 2011
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: From relativistic point of view it has been shown here that a polarized photon can be visualized to give an equivalent spinorial description when the two-component spinor is the eigenvector of $2\times2$ Hermitian, Polarization matrix. The Berry phase of the initial state can be calculated by matrix method as it complete one rotation over a closed path on the Poincare's sphere.
description: 6 pages
Disorder regimes and equivalence of disorder types in artificial spin ice
Creators: name: Budrikis, Zoe
name: Politi, Paolo
name: Stamps, R. L.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The field-induced dynamics of artificial spin ice are determined in part by interactions between magnetic islands, and the switching characteristics of each island. Disorder in either of these affects the response to applied fields. Numerical simulations are used to show that disorder effects are determined primarily by the strength of disorder relative to inter-island interactions, rather than by the type of disorder. Weak and strong disorder regimes exist and can be defined in a quantitative way.
description: The following article has been submitted to J. Appl. Phys. After it is published, it will be found at http://link.aip.org/link/?jap
The Stabilizing Effect of Spacetime Expansion on Relativistic Fluids With Sharp Results for the Radiation Equation of State
Creators: name: Speck, Jared
Publisher: name: arXiv
Year: 2012
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35A01 (Primary) 35Q31, 76Y05, 83F05 (Secondary)

description: In this article, we study the 1 + 3 dimensional relativistic Euler equations on a pre-specified conformally flat expanding spacetime background with spatial slices that are diffeomorphic to $\mathbb{R}^3.$ We assume that the fluid verifies the equation of state $p = c_s^2 ρ,$ where $0 \leq c_s \leq \sqrt{1/3}$ is the speed of sound. We also assume that the inverse of the scale factor associated to the expanding spacetime metric verifies a $c_s-$dependent time-integrability condition. Under these assumptions, we use the vectorfield energy method to prove that an explicit family of physically motivated, spatially homogeneous, and spatially isotropic fluid solutions is globally future-stable under small perturbations of their initial conditions. The explicit solutions corresponding to each scale factor are analogs of the well-known spatially flat Friedmann-Lema\^ıtre-Robertson-Walker family. Our nonlinear analysis, which exploits dissipative terms generated by the expansion, shows that the perturbed solutions exist for all future times and remain close to the explicit solutions. This work is an extension of previous results, which showed that an analogous stability result holds when the spacetime is exponentially expanding. In the case of the radiation equation of state $p = (1/3)ρ,$ we also show that if the time-integrability condition for the inverse of the scale factor fails to hold, then the explicit fluid solutions are unstable. More precisely, we show that arbitrarily small smooth perturbations of the explicit solutions' initial conditions can launch perturbed solutions that form shocks in finite time. The shock formation proof is based on the conformal invariance of the relativistic Euler equations when $c_s^2 = 1/3,$ which allows for a reduction to a well-known result of Christodoulou.
description: 42 pages
X-ray spectral curvature of High Frequency Peaked BL Lacs: a predictor for the TeV flux
Creators: name: Massaro, F.
name: Paggi, A.
name: Elvis, M.
name: Cavaliere, A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Most of the extragalactic sources detected at TeV energies are BL Lac objects. They belong to the subclass of "high frequency peaked BL Lacs" (HBLs) exhibiting spectral energy distributions with a lower energy peak in the X-ray band; this is widely interpreted as synchrotron emission from relativistic electrons. The X-ray spectra are generally curved, and well described in terms of a log-parabolic shape. In a previous investigation of TeV HBLs (TBLs) we found two correlations between their spectral parameters. (1) The synchrotron peak luminosity L_p increases with its peak energy E_p; (2) the curvature parameter b decreases as E_p increases. The first is consistent with the synchrotron scenario, while the second is expected from statistical/stochastic acceleration mechanisms for the emitting electrons. Here we present an extensive X-ray analysis of a sample of HBLs observed with XMM-Newton and SWIFT but undetected at TeV energies (UBLs), to compare their spectral behavior with that of TBLs. Investigating the distributions of their spectral parameters and comparing the TBL X-ray spectra with that of UBLs, we develop a criterion to select the best HBLs candidates for future TeV observations.
description: 25 pages, 6 figures, Astrophysical Journal published
Ergodic Capacity of Cognitive Radio under Imperfect Channel State Information
Creators: name: Rezk, Zouheir
name: Alouini, Mohamed-Slim
Publisher: name: arXiv
Year: 2012
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: A spectrum-sharing communication system where the secondary user is aware of the instantaneous channel state information (CSI) of the secondary link, but knows only the statistics and an estimated version of the secondary transmitter-primary receiver (ST-PR) link, is investigated. The optimum power profile and the ergodic capacity of the secondary link are derived for general fading channels (with continuous probability density function) under average and peak transmit-power constraints and with respect to two different interference constraints: an interference outage constraint and a signal-to-interference outage constraint. When applied to Rayleigh fading channels, our results show, for instance, that the interference constraint is harmful at high-power regime in the sense that the capacity does not increase with the power, whereas at low-power regime, it has a marginal impact and no-interference performance corresponding to the ergodic capacity under average or peak transmit power constraint in absence of the primary user, may be achieved.
description: To appear in IEEE TVT. 12 pages, 8 figures, 1 table. Matlab codes to reproduce results are available upon request. Please contact one of the authors for this purpose
90 GHz Continuum Observations of Messier 66
Creators: name: Nikolic, Bojan
name: Bolton, Rosie
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Radio emission at around 90 GHz from star-forming galaxies is expected to be strongly dominated by the free-free component due to ionising radiation from massive, short-lived, stars. We present high surface-brightness sensitivity observations at 90 GHz of the nearby star-forming galaxy Messier 66 with resolution of about 9 arcsec (corresponding to a physical scale of about 500 pc) and analyse these observations in combination with archival lower frequency radio and mid-infrared measurements. For the four regions for which the observations support our models we find that the free-free component indeed dominates the emission at 90 GHz, making up 76--90 per cent of the luminosity at this frequency but with the data also consistent with all of the emission being due to free-free. The estimates of free-free luminosities are also consistent, within measurement and decomposition errors, with star-formation rates derived from lower radio frequencies and mid-infrared observations. In our analysis we consider both power-law and curved spectra for the synchrotron component but do not find evidence to support the curved model in preference to the power-law.
description: 7 pages, 5 figures. Submitted to MNRAS. Further information, plots, links to software are available at http://www.mrao.cam.ac.uk/~bn204/galevol/2012-90ghz-m66.html
Ingeborg Huld-Zetsche, Trierer Reliefsigillata, Werkstatt I
Creators: name: Mariën, Marcel E.
Publisher: name: Trierer Zeitschrift - Archäologie und Kunst des Trierer Landes und seiner Nachbargebiete
Year: 2023

description: Rezension zu: Ingeborg Huld-Zetsche, Trierer Reliefsigillata, Werkstatt I. Materialien zur römisch-germanischen Keramik, Heft 9, 1972. Herausgeber Römisch-Germanische Kommission, Frankfurt. Verlag R. Habelt, Bonn. 232 Seiten, 14 Abb., 69 Taf., 1 Plan, 1 Tabelle
description: Trierer Zeitschrift - Archäologie und Kunst des Trierer Landes und seiner Nachbargebiete, Bd. 37 (1974): Trierer Zeitschrift : für Geschichte und Kunst des Trierer Landes und seiner Nachbargebiete
Faraday rotation in the MOJAVE blazars: 3C 273 a case study
Creators: name: Hovatta, T.
name: Lister, M. L.
name: Aller, M. F.
name: Aller, H. D.
name: Homan, D. C.
name: Kovalev, Y. Y.
name: Pushkarev, A. B
name: Savolainen, T.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Radio polarimetric observations of Active Galactic Nuclei can reveal the magnetic field structure in the parsec-scale jets of these sources. We have observed the gamma-ray blazar 3C 273 as part of our multi-frequency survey with the Very Long Baseline Array to study Faraday rotation in a large sample of jets. Our observations re-confirm the transverse rotation measure gradient in 3C 273. For the first time the gradient is seen to cross zero which is further indication for a helical magnetic field and spine-sheath structure in the jet. We believe the difference to previous epochs is due to a different part of the jet being illuminated in our observations.
description: 6 pages, 3 figures. To appear in the proceedings of "Beamed and Unbeamed Gamma-rays from Galaxies", held in Muonio, Finland, April 11-15, 2011. Journal of Physics: Conference Series