cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Photon-emitter dressed states in a closed waveguide
Creators: name: Lonigro, Davide
name: Facchi, Paolo
name: Greentree, Andrew D.
name: Pascazio, Saverio
name: Pepe, Francesco V.
name: Pomarico, Domenico
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study a system made up of one or two two-level quantum emitters, coupled to a single transverse mode of a closed waveguide, in which photon wavenumbers and frequencies are discretized, and characterize the stable states in which one excitation is steadily shared between the field and the emitters. We unearth finite-size effects in the field-emitter interactions and identify a family of dressed states, that represent the forerunners of bound states in the continuum in the limit of an infinite waveguide. We finally consider the potential interest of such states for applications in the field of quantum information.
description: 11 pages, 6 figures
Comment on ``General Relativity Resolves Galactic Rotation Without Exotic Dark Matter'' by F.I. Cooperstock & S. Tieu
Creators: name: Fuchs, Burkhard
name: Phleps, Stefanie
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The general relativistic model of Cooperstock & Tieu, which attempts to fit rotation curves of spiral galaxies without invoking dark matter, is tested empirically using observations of the Milky Way. In particular, predictions for the mass density in the solar neighbourhood and the vertical density distribution at the position of the Sun are compared with observations. It is shown that the model of Cooperstock & Tieu, which was so constructed that it gives an excellent fit of the observed rotation curve, singularly fails to reproduce the observed local mass density and the vertical density profile of the Milky Way.
description: 4 pages, 1 figure, accepted by New Astronomy
WE CAN DO THIS: HOW LEADERS INFLUENCE THE TEACHER BELIEFS THAT CONTRIBUTE TO FOUNDATIONAL LITERACY EQUITY
Creators: name: Nolin, Rebecca
Publisher: name: American University
Year: 2023
Subjects: classificationCode: 3901
subject: Curriculum and pedagogy
classificationCode: 390104
subject: English and literacy curriculum and pedagogy (excl. LOTE, ESL and TESOL)
classificationCode: 390302
subject: Early childhood education
classificationCode: 390307
subject: Teacher education and professional development of educators
classificationCode: 390407
subject: Inclusive education
classificationCode: 390412
subject: Teacher and student wellbeing
classificationCode: 441012
subject: Sociology of inequalities

description: Reading reforms in U.S. schools have provided important but insufficient support for improving reading equity. Measures of early reading continue to demonstrate that schools have failed to equip historically marginalized students with the early literacy skills and knowledge they require to become skillful readers. Prekindergarten through second grade teachers must know how to deliver evidence-based instruction. Equally important, teachers must believe that they can deliver effective instruction and that their students can achieve ambitious foundational literacy outcomes. This study sought to understand the role that school leaders at one public elementary school played in promoting teachers’ beliefs about their school, themselves, and their students. With foundations in self-efficacy and frame analysis theory, the study followed a mixed-method, two-stage design uncovering how school leaders’ beliefs compared to those of teachers and how school leaders could adapt and frame systems and structures to influence teachers’ beliefs. The study found that school leaders prioritized influencing teachers’ beliefs about students in order to increase implementation of evidence-based instruction, while teachers believed their overstretched capacity most limited foundational literacy success. The study also uncovered a persistent paradox: teachers reported high levels confidence in their ability to offer effective foundational literacy instruction even as they held relatively muted expectations for student success. One implication confirmed the importance of supportive systems and structures for influencing teacher beliefs as well as the need for more collaboration among teachers and school leaders when shaping them. Another implication highlighted the need for teachers to experience success in order to believe it is possible. Recommendations for the school context include adjusting data collection practices as well as allotting more time for teachers to plan effective responses to data. Recommendations for the district and education community echo a need to reconsider teachers’ planning time, but also call for a revaluation of school enrollment policies that may increase student mobility and concentrate poverty at so-called high needs schools. The researcher's positionality and how it influenced the study is discussed throughout.
Francesco De Angelis – Jens-Arne Dickmann – Felix Pirson – Ralf von den Hoff (Hgg.), Kunst von unten? Stil und Gesellschaft in der antiken Welt von der >arte plebea< bis heute
Creators: name: Steuernagel, Dirk
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Rezension zu: Francesco De Angelis – Jens-Arne Dickmann – Felix Pirson – Ralf von den Hoff (Hgg.), Kunst von unten? Stil und Gesellschaft in der antiken Welt von der >arte plebea< bis heute. Internationales Kolloquium anlässlich des 70. Geburtstages von Paul Zanker, Rom Villa Massimo, 8.-9. Juni 2007, Palilia 27. Wiesbaden: Reichert Verlag 2012, 184 S., ungez., 158 s/w.-Abb.
description: Göttinger Forum für Altertumswissenschaft, Bd. 16 (2013): Göttinger Forum für Altertumswissenschaft
What is the Research Data Alliance and how can it benefit you?
Creators: name: Fink, Anne Sofie
name: Buss, Mareike
name: Vasiljević, Nikola
name: Bangert, Daniel
name: Zurcher, Sacha
name: Kryger Hansen, Karsten
Publisher: name: Zenodo
Year: 2019
Subjects: Research Data Management
Research Data Alliance
Data Management
Open Science
Open Research
Open Innovation
Open Data

description: This is a collection of slides presented at the first event organized by the Danish node of the Research Data Alliance:
 "What is the Research Data Alliance and how can it benefit you?" which took place on June 14, 2019 at Copenhagen Business School, Frederiksberg, Denmark

 Consult the program below for links to the slides presented at the event. Program 09:00-09:20: Welcome and introduction to the Danish RDA node – Anne Sofie Fink Kjeldgaard (Rigsarkivet/The National Archives) 09:20-09:50: The RDA network – Daniel Bangert (Göttingen State and University Library, via Zoom) 10:05-10:30: How to get involved in RDA and funding options – Sacha Zurcher (RUC) 10:30-11:00: RDA groups and developments – Karsten Kryger Hansen (AAU) 11:15-11:45: What can RDA do for the social sciences? – Mareike Buss (CBS) and Anne Sofie Fink Kjeldgaard (Rigsarkivet/The National Archives) 11:45-12:15: What can RDA do for engineering?– Nikola Vasiljevic (DTU) 12:15-12:30: Summary and conclusion – Mareike Buss (CBS), Nikola Vasilijevic (DTU) & Anne Sofie Fink Kjeldgaard (Rigsarkivet/The National Archives)
Simulation of three-spin evolution under XX Hamiltonian on quantum processor of IBM-Quantum Experience
Creators: name: Doronin, S. I.
name: Fel'dman, E. B.
name: Zenchuk, A. I.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We simulate the evolution of three-node spin chain on the quantum processor of IBM Quantum Experience using the diagonalization of $XX$-Hamiltonian and representing the evolution operator in terms of CNOT operations and one-qubit rotations. We study the single excitation transfer from the first to the third node and show the significant difference between calculated and theoretical values of state transfer probability. Then we propose a method reducing this difference by applying the two-parameter transformation including the shift and scale of the calculated probabilities. { We demonstrate the universality of this transformation inside of the class of three-node evolutionary systems governed by the $XX$-Hamiltonian.
description: 17 pages, 7 figures
Atomic lattice excitons: from condensates to crystals
Creators: name: Kantian, A.
name: Daley, A. J.
name: Torma, P.
name: Zoller, P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We discuss atomic lattice excitons (ALEs), bound particle-hole pairs formed by fermionic atoms in two bands of an optical lattice. Such a system provides a clean setup to study fundamental properties of excitons, ranging from condensation to exciton crystals (which appear for a large effective mass ratio between particles and holes). Using both mean-field treatments and 1D numerical computation, we discuss the properities of ALEs under varying conditions, and discuss in particular their preparation and measurement.
description: 19 pages, 15 figures, changed formatting for journal submission, corrected minor errors in reference list and text
Optimal scaling for partially updating MCMC algorithms
Creators: name: Neal, Peter
name: Roberts, Gareth
Publisher: name: arXiv
Year: 2006
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60F05 (Primary) 65C05 (Secondary)

description: In this paper we shall consider optimal scaling problems for high-dimensional Metropolis--Hastings algorithms where updates can be chosen to be lower dimensional than the target density itself. We find that the optimal scaling rule for the Metropolis algorithm, which tunes the overall algorithm acceptance rate to be 0.234, holds for the so-called Metropolis-within-Gibbs algorithm as well. Furthermore, the optimal efficiency obtainable is independent of the dimensionality of the update rule. This has important implications for the MCMC practitioner since high-dimensional updates are generally computationally more demanding, so that lower-dimensional updates are therefore to be preferred. Similar results with rather different conclusions are given for so-called Langevin updates. In this case, it is found that high-dimensional updates are frequently most efficient, even taking into account computing costs.
description: Published at http://dx.doi.org/10.1214/105051605000000791 in the Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Gertrud Platz-Horster, Erhabene Bilder. Die Kameen in der Antikensammlung Berlin
Creators: name: Lang, Jörn
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Rezension zu: Gertrud Platz-Horster, Erhabene Bilder. Die Kameen in der Antikensammlung Berlin. Wiesbaden: Reichert Verlag 2012, 328 S., 80 Taf. m. 985 nahezu durchgängig farb. Abb.
description: Göttinger Forum für Altertumswissenschaft, Bd. 16 (2013): Göttinger Forum für Altertumswissenschaft
Terahertz pulse-driven collective mode in the nematic superconducting state of Ba$_{1-x}$K$_x$Fe$_2$As$_2$
Creators: name: Grasset, Romain
name: Katsumi, Kota
name: Massat, Pierre
name: Wen, Hai-Hu
name: Chen, Xian-Hui
name: Gallais, Yann
name: Shimano, Ryo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We investigate the iron-based superconductor Ba$_{1-x}$K$_x$Fe$_2$As$_2$ using intense terahertz (THz) light. In the superconducting state a THz Kerr signal is observed and assigned to non-linear THz coupling to superconducting degrees of freedom. The polarization dependence of the THz Kerr signal is remarkably sensitive to the coexistence of a nematic order. In the absence of nematic order the $C_4$ symmetric polarization dependence of the THz Kerr signal is consistent with a coupling to the Higgs amplitude mode of the superconducting condensate. In the coexisting nematic and superconducting state the signal becomes purely nematic with a vanishing $C_4$ symmetric component, signaling the emergence of a new superconducting collective mode activated by nematicity.
description: 25 pages, 3 figures. Supplementary Material available upon request
Foteini Kolovou (Hg.), Byzanzrezeption in Europa. Spurensuche über das Mittelalter und die Renaissance bis in die Gegenwart
Creators: name: Schneider, Horst
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Rezension zu: Foteini Kolovou (Hg.), Byzanzrezeption in Europa. Spurensuche über das Mittelalter und die Renaissance bis in die Gegenwart. Byzantinisches Archiv 24. Berlin/Boston: De Gruyter Verlag 2012, 354 S., 13 Taf.
description: Göttinger Forum für Altertumswissenschaft, Bd. 16 (2013): Göttinger Forum für Altertumswissenschaft
Effect of magnetic anisotropy relaxation on laser-induced magnetization precession in thin galfenol films
Creators: name: Gerevenkov, P. I.
name: Kuntu, D. V.
name: Filatov, Ia. A.
name: Shelukhin, L. A.
name: Wang, M.
name: Pattnaik, D. P.
name: Rushforth, A. W.
name: Kalashnikova, A. M.
name: Khokhlov, N. E.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The rate and pathways of relaxation of a magnetic medium to its equilibrium following excitation with intense and short laser pulses are the key ingredients of ultrafast optical control of spins. Here we study experimentally the evolution of the magnetization and magnetic anisotropy of thin films of a ferromagnetic metal galfenol (Fe$_{0.81}$Ga$_{0.19}$) resulting from excitation with a femtosecond laser pulse. From the temporal evolution of the hysteresis loops we deduce that the magnetization $M_S$ and magnetic anisotropy parameters $K$ recover within a nanosecond, and the ratio between $K$ and $M_S$ satisfies the thermal equilibrium's power law in the whole time range spanning from a few picoseconds to 3 nanoseconds. We further use the experimentally obtained relaxation times of $M_S$ and $K$ to analyze the laser-induced precession and demonstrate how they contribute to its frequency evolution at the nanosecond timescale.
description: 8 pages, 7 figures
M. Kiderlen – P. Themelis (Hgg.), Das Poseidonheiligtum bei Akovitika in Messenien. Struktur und Entwicklungszusammenhang eines regionalen Zentrums. Ergebnisse einer Notgrabung 1969 und einer Nachuntersuchung mit Prospektion 2005
Creators: name: Ruppenstein, Florian
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Rezension zu: M. Kiderlen – P. Themelis (Hgg.), Das Poseidonheiligtum bei Akovitika in Messenien. Struktur und Entwicklungszusammenhang eines regionalen Zentrums. Ergebnisse einer Notgrabung 1969 und einer Nachuntersuchung mit Prospektion 2005. Wiesbaden: Reichert Verlag 2010, 255 S., 168 Abb., 8 lose Beil., 4 lose Pläne
description: Göttinger Forum für Altertumswissenschaft, Bd. 16 (2013): Göttinger Forum für Altertumswissenschaft
On unipotent quotients and some A^1-contractible smooth schemes
Creators: name: Asok, Aravind
name: Doran, Brent
Publisher: name: arXiv
Year: 2007
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics

description: We study quotients of quasi-affine schemes by unipotent groups over fields of characteristic 0. To do this, we introduce a notion of stability which allows us to characterize exactly when a principal bundle quotient exists and, together with a cohomological vanishing criterion, to characterize whether or not the resulting quasi-affine quotient scheme is affine. We completely analyze the case of G_a-invariant hypersurfaces in a linear G_a-representation W; here the above characterizations admit simple geometric and algebraic interpretations. As an application, we produce arbitrary dimensional families of non-isomorphic smooth quasi-affine but not affine n-dimensional varieties (n \geq 6) that are contractible in the sense of A^1-homotopy theory. Indeed, existence follows without any computation; yet explicit defining equations for the varieties depend only on knowing some linear G_a- and SL_2- invariants, which, for a sufficiently large class, we provide. Similarly, we produce infinitely many non-isomorphic examples in dimensions 4 and 5. Over C, the analytic spaces underlying these varieties are non-isomorphic, non-Stein, topologically contractible and often diffeomorphic to C^n.
description: 41 pages, published version (before page proofs); some typos corrected
Dispersionless transport in a washboard potential
Creators: name: Lindenberg, Katja
name: Sancho, J. M.
name: Lacasta, A. M.
name: Sokolov, I. M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study and characterize a new dynamical regime of underdamped particles in a tilted washboard potential. We find that for small friction in a finite range of forces the particles move essentially nondispersively, that is, coherently, over long intervals of time. The associated distribution of the particle positions moves at an essentially constant velocity and is far from Gaussian-like. This new regime is complementary to, and entirely different from, well-known nonlinear response and large dispersion regimes observed for other values of the external force.
description: To appear in Phys. Rev. Letters
FA2PbBr4: synthesis, structure and unusual optical properties of two polymorphs of formamidinium-based layered (110) hybrid perovskite
Creators: name: Fateev, Sergey A.
name: Petrov, Andrey A.
name: Marchenko, Ekaterina I.
name: Zubavichus, Yan V.
name: Khrustalev, Victor N.
name: Petrov, Andrey V.
name: Aksenov, Sergey M.
name: Goodilin, Eugene A.
name: Tarasov, Alexey B.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences
subject: A.0
subject: 0.0

description: Small cations such as guanidinium and cesium can act as templating cations to form low dimensional phases (2D, 1D, 0D) in the case of excess of organic halides. However, such phases with the widely used formamidinium (FA+) cation have not been reported so far. In this study, we discovered two novel low dimensional phases with a composition of FA2PbBr4 and investigated the prerequisites of their formation upon crystallization of FABr-excessive solutions of FAPbBr3. We found that both phases have the structure of (110) layered perovskite but are represented by two different polymorphs with eclipsed and staggered arrangement of adjacent layers. It was shown that FA2PbBr4 phases usually exist in a labile equilibrium with FAPbBr3 3D perovskite and can form composites with it. The optical properties of both polymorphs were comprehensively studied by means of absorption spectroscopy, diffuse reflection spectroscopy and photoluminescence spectroscopy. DFT calculations were applied to investigate the band structure of the FA2PbBr4 and to corroborate the conclusions on their optoelectronic properties. As a result, we found that FA2PbBr4 phases irradiated by UV can exhibit effective green photoluminescence due to a transfer of excitation energy to defective states or 3D perovskite inclusions.
description: 24 pages, 19 figures
Wolfgang Blösel – Karl-Joachim Hölkeskamp (Hgg.), Von der 'militia equestris' zur 'militia urbana'. Prominenzrollen und Karrierefelder im antiken Rom
Creators: name: Beigel, Thorsten
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Rezension zu: Wolfgang Blösel – Karl-Joachim Hölkeskamp (Hgg.), Von der 'militia equestris' zur 'militia urbana'. Prominenzrollen und Karrierefelder im antiken Rom. Beiträge einer internationalen Tagung vom 16. bis 18. Mai 2008 an der Universität zu Köln. Stuttgart: Franz Steiner Verlag 2011, 237 S., 5 s/w-Tab.
description: Göttinger Forum für Altertumswissenschaft, Bd. 16 (2013): Göttinger Forum für Altertumswissenschaft
Momentum construction on Ricci-flat Kähler cones
Creators: name: Futaki, Akito
Publisher: name: arXiv
Year: 2007
Subjects: subject: Differential Geometry (math.DG)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 53C55

description: We extend Calabi ansatz over Kähler-Einstein manifolds to Sasaki-Einstein manifolds. As an application we prove the existence of a complete scalar-flat Kähler metric on Kähler cone manifolds over Sasaki-Einstein manifolds. In particular there exists a complete scalar-flat Kähler metric on the toric Kähler cone manifold constructed from a toric diagram with a constant height.
description: 18 pages. The title is changed. Statements with incomplete proofs are modified
The Hubbard model on triangular $N$-leg cylinders: chiral and non-chiral spin liquids
Creators: name: Tocchio, Luca F.
name: Montorsi, Arianna
name: Becca, Federico
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The existence of a gapped chiral spin liquid has been recently suggested in the vicinity of the metal-insulator transition of the Hubbard model on the triangular lattice, by intensive density-matrix renormalization group (DMRG) simulations [A. Szasz, J. Motruk, M.P. Zaletel, and J.E. Moore, Phys. Rev. X {\bf 10}, 021042 (2020)]. Here, we report the results obtained within the variational Monte Carlo technique based upon Jastrow-Slater wave functions, implemented with backflow correlations. As in DMRG calculations, we consider $N$-leg cylinders. For $N=4$ and in the presence of a next-nearest neighbor hopping, a chiral spin liquid emerges between the metal and the insulator with magnetic quasi-long-range order. Within our approach, the chiral state is gapped and breaks the reflection symmetry. By contrast, for both $N=5$ and $N=6$, the chiral spin liquid is not the state with the lowest variational energy: in the former case a nematic spin liquid is found in the entire insulating regime, while for the less frustrated case with $N=6$ the results are very similar to the one obtained on two-dimensional clusters [L.F. Tocchio, A. Montorsi, and F. Becca, Phys. Rev. B {\bf 102}, 115150 (2020)], with an antiferromagnetic phase close to the metal-insulator transition and a nematic spin liquid in the strong-coupling regime.
description: 9 pages, 7 figures
Giant magnon bound states from strongly coupled N=4 SYM
Creators: name: Berenstein, David
name: Vazquez, Samuel E.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We calculate in a very simple way the spectrum of giant magnon bound states at strong coupling in N=4 SYM, by utilizing the description of the field theory vacuum in terms of a condensate of eigenvalues of commuting matrices. We further show that these calculations can be understood in terms of the central charge extension that permits the calculation of BPS masses in the Coulomb branch of N=4 SYM. This paper shows further evidence that the strong coupling expansion of the maximally supersymmetric Yang-Mills theory in four dimensions can be done systematically from first principles, without the assumption of integrability.
description: 19 pages, uses revtex
Reduced order modeling of dynamical systems using artificial neural networks applied to water circulation
Creators: name: Nogueira, Alberto Costa
name: Almeida, João Lucas de Sousa
name: Auger, Guillaume
name: Watson, Campbell D.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: General circulation models are essential tools in weather and hydrodynamic simulation. They solve discretized, complex physical equations in order to compute evolutionary states of dynamical systems, such as the hydrodynamics of a lake. However, high-resolution numerical solutions using such models are extremely computational and time consuming, often requiring a high performance computing architecture to be executed satisfactorily. Machine learning (ML)-based low-dimensional surrogate models are a promising alternative to speed up these simulations without undermining the quality of predictions. In this work, we develop two examples of fast, reliable, low-dimensional surrogate models to produce a 36 hour forecast of the depth-averaged hydrodynamics at Lake George NY, USA. Our ML approach uses two widespread artificial neural network (ANN) architectures: fully connected neural networks and long short-term memory. These ANN architectures are first validated in the deterministic and chaotic regimes of the Lorenz system and then combined with proper orthogonal decomposition (to reduce the dimensionality of the incoming input data) to emulate the depth-averaged hydrodynamics of a flow simulator called SUNTANS. Results show the ANN-based reduced order models have promising accuracy levels (within 6% of the prediction range) and advocate for further investigation into hydrodynamic applications.
description: 20 pages, 10 figures, CFDML2020, Lecture Notes in Computer Science 2020
CP-violation in Compton scattering
Creators: name: Gorchtein, Mikhail
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: I consider Compton scattering off the nucleon in the presence of $CP$ violation. I construct the Compton tensor which possesses these features and consider low energy expansion (LEX) of the corresponding amplitudes. It allows to separate out the Born contribution which only depends on the static properties of the nucleon, such as the electric charge, the mass, the magnetic moment, and the electric dipole moment (EDM). I introduce new structure constants, the $T$-odd nucleon polarizabilities which parametrize the unknown non-Born part. These constants describe the response of the $T$-violating content of the nucleon to the external quasistatic electromagnetic field. As an estimate, I provide a HBChPT calculation for these new polarizabilities and discuss the implications for the experiment.
description: 7 pages, 5 figures, revtex
Holger Weinstock, Statuenstützen an vorkaiserzeitlichen Marmorstatuen
Creators: name: Kansteiner, Sascha
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Rezension zu: Holger Weinstock, Statuenstützen an vorkaiserzeitlichen Marmorstatuen. Antiquitates Bd. 60. Hamburg: Dr. Kovač 2012 (zugl. Diss. Freiburg 1996), 255 S., 68 s/w-Abb.
description: Göttinger Forum für Altertumswissenschaft, Bd. 16 (2013): Göttinger Forum für Altertumswissenschaft
Phonon spectral function of the Holstein polaron
Creators: name: Loos, J
name: Hohenadler, M
name: Alvermann, A
name: Fehske, H
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The phonon spectral function of the one-dimensional Holstein model is obtained within weak and strong-coupling approximations based on analytical self-energy calculations. The characteristic excitations found in the limit of small charge-carrier density are related to the known (electronic) spectral properties of Holstein polarons such as the polaron band dispersion. Particular emphasis is laid on the different physics occurring in the adiabatic and anti-adiabatic regimes, respectively. Comparison is made with a cluster approach exploiting exact numerical results on small systems to yield an approximation for the thermodynamic limit. This method, similar to cluster perturbation theory, confirms the analytical findings, and yields accurate results also in the intermediate-coupling regime.
description: 15 pages, 2 figures; revised and extended version
Martin Tombrägel, Die republikanischen Otiumvillen von Tivoli
Creators: name: Maschek, Dominik
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Rezension zu: Martin Tombrägel, Die republikanischen Otiumvillen von Tivoli. Palilia 25. Wiesbaden: Reichert Verlag 2012, 255 S., 139 s/w-Abb. und Strichpläne
description: Göttinger Forum für Altertumswissenschaft, Bd. 16 (2013): Göttinger Forum für Altertumswissenschaft
Utilizing the information content in two-state trajectories
Creators: name: Flomenbom, Ophir
name: Silbey, Robert J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantitative Methods (q-bio.QM)
subject: FOS: Biological sciences

description: The signal from many single molecule experiments monitoring molecular processes, such as enzyme turnover via fluorescence and opening and closing of ion channel via the flux of ions, consists of a time series of stochastic on and off (or open and closed) periods, termed a two-state trajectory. This signal reflects the dynamics in the underlying multi-substate on-off kinetic scheme (KS) of the process. The determination of the underlying KS is difficult and sometimes even impossible due to the loss of information in the mapping of the mutli dimensional KS onto two dimensions. Here we introduce a new procedure that efficiently and optimally relates the signal to all equivalent underlying KSs. This procedure partitions the space of KSs into canonical (unique) forms that can handle any KS, and obtains the topology and other details of the canonical form from the data without the need for fitting. Also established are relationships between the data and the topology of the canonical form to the on-off connectivity of a KS. The suggested canonical forms constitute a powerful tool in discriminating between KSs. Based on our approach, the upper bound on the information content in two state trajectories is determined.
description: The file contains: main text (+4 figures), supporting information (+9 figures), poster (1 page)
Julia Hoffmann-Salz, Die wirtschaftlichen Auswirkungen der römischen Eroberung. Vergleichende Untersuchungen der Provinzen Hispania Tarraconensis, Africa Proconsularis und Syria
Creators: name: Müller, Holger
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Rezension zu: Julia Hoffmann-Salz, Die wirtschaftlichen Auswirkungen der römischen Eroberung. Vergleichende Untersuchungen der Provinzen Hispania Tarraconensis, Africa Proconsularis und Syria. Historia – Einzelschriften 218. Stuttgart: Franz Steiner Verlag 2011, 561 S., 26 s/w-Abb, 3 Kart.
description: Göttinger Forum für Altertumswissenschaft, Bd. 16 (2013): Göttinger Forum für Altertumswissenschaft
Anne Viola Siebert, Geschichte(n) in Ton. Römische Architekturterrakotten
Creators: name: Känel, Rudolf
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Rezension zu: Anne Viola Siebert, Geschichte(n) in Ton. Römische Architekturterrakotten. Mit Beiträgen von Sara Beuster und Christian E. Loeben. Museum Kestnerianum 16. Regensburg: Schnell und Steiner Verlag 2011, 144 S., 28 s/w-Abb., 180 Farbabb.
description: Göttinger Forum für Altertumswissenschaft, Bd. 16 (2013): Göttinger Forum für Altertumswissenschaft
The blow-up problem for a semilinear parabolic equation with a potential
Creators: name: Cortazar, C.
name: Elgueta, M.
name: Rossi, J. D.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35K57, 35B40

description: Let $Ω$ be a bounded smooth domain in $\RR^N$. We consider the problem $u_t= Δu + V(x) u^p$ in $Ω\times [0,T)$, with Dirichlet boundary conditions $u=0$ on $\partial Ω\times [0,T)$ and initial datum $u(x,0)= M ϕ(x)$ where $M \geq 0$, $ϕ$ is positive and compatible with the boundary condition. We give estimates for the blow up time of solutions for large values of $M$. As a consequence of these estimates we find that, for $M$ large, the blow up set concentrates near the points where $ϕ^{p-1}V$ attains its maximum.
Probing the CP structure of the top quark Yukawa coupling: Loop sensitivity vs. on-shell sensitivity
Creators: name: Martini, Till
name: Pan, Ren-Qi
name: Schulze, Markus
name: Xiao, Meng
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The question whether the Higgs boson is connected to additional CP violation is one of the driving forces behind precision studies at the Large Hadron Collider. In this work, we investigate the CP structure of the top quark Yukawa interaction-one of the most prominent places for searching for New Physics-through Higgs boson loops in top quark pair production. We calculate the electroweak corrections including arbitrary CP mixtures at next-to-leading-order in the Standard Model Effective Field Theory. This approach of probing Higgs boson degrees of freedom relies on the large $t\bar{t}$ cross section and the excellent perturbative control. In addition, we consider all direct probes with on-shell Higgs boson production in association with a single top quark or top quark pair. This allows us to contrast loop sensitivity versus on-shell sensitivity in these fundamentally different process dynamics. We find that loop sensitivity in $t\bar{t}$ production and on-shell sensitivity in $t\bar{t}H$ and $tH$ provide complementary handles over a wide range of parameter space.
description: updated Fig.2, typos fixed, 10 pages, 8 figures, published version
SOCRATES Assessment of Perceptual Abnormalities and Unusual Thought Content
Creators: name: Kelleher, Ian
name: Cannon, Mary
Publisher: name: Royal College of Surgeons in Ireland
Year: 2021
Subjects: subject: 110319 Psychiatry (incl. Psychotherapy)
subject: FOS: Clinical medicine

description: The aim of the SOCRATES assessment is to provide a systematic and comprehensive approach to the assessment of perceptual abnormalities and unusual thought content in research and clinic settings. The method provides a template for the information that should be gathered in relation to reported phenomena. It provides a standardised approach to assessment that assists the identification of changes over time and facilitates comparisons between centres.
Markus Beyeler, Geschenke des Kaisers. Studien zur Chronologie, zu den Empfängern und zu den Gegenständen der kaiserlichen Vergabungen im 4. Jahrhundert n. Chr.
Creators: name: Dahmen, Karsten
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Rezension zu: Markus Beyeler, Geschenke des Kaisers. Studien zur Chronologie, zu den Empfängern und zu den Gegenständen der kaiserlichen Vergabungen im 4. Jahrhundert n. Chr. Klio-Beihefte, Neue Folge 18. Berlin: Akademie Verlag 2011, 462 S.
description: Göttinger Forum für Altertumswissenschaft, Bd. 16 (2013): Göttinger Forum für Altertumswissenschaft
Environmental dependence in the ellipsoidal collapse model
Creators: name: Desjacques, Vincent
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: N-body simulations have demonstrated a correlation between the properties of haloes and their environment. In this paper, we assess whether the ellipsoidal collapse model can produce a similar dependence. First, we explore the statistical correlation that originates from Gaussian initial conditions. We derive analytic expressions for a number of joint statistics of the shear tensor and estimate the sensitivity of the local characteristics of the shear to the global geometry of the large scale environment. Next, we concentrate on the dynamical aspect of the environmental dependence using a simplified model that takes into account the interaction between a collapsing halo and its environment. We find that the tidal force exerted by the surrounding mass distribution causes haloes embedded in overdense regions to virialize earlier. An effective density threshold whose shape depends on the large scale density provides a good description of this environmental effect. We show that, using this approach, a correlation between formation redshift, large scale bias and environment density naturally arises. The strength of the effect is comparable, albeit smaller, to that seen in simulations. It is largest for low mass haloes and decreases as one goes to higher mass objects. Furthermore, haloes that formed early are substantially more clustered than those that assembled recently. On the other hand, our analytic model predicts a decrease in median formation redshift with increasing environment density, in disagreement with the trend detected in overdense regions. However, our results appear consistent with the behaviour inferred in relatively underdense regions. We argue that the ellipsoidal collapse model may apply in low density environments where nonlinear effects are negligible (abridged).
description: Minor changes in line with referee report. References added
The Spitzer/IRS Infrared Spectrum and Abundances of the Planetary Nebula IC 2448
Creators: name: Guiles, S.
name: Bernard-Salas, J.
name: Pottasch, S. R.
name: Roellig, T. L.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the mid-infrared spectrum of the planetary nebula IC 2448. In order to determine the chemical composition of the nebula, we use the infrared line fluxes from the Spitzer spectrum along with optical line fluxes from the literature and ultraviolet line fluxes from archival IUE spectra. We determine an extinction of C(H-beta) = 0.27 from hydrogen recombination lines and the radio to H-beta ratio. Forbidden line ratios give an electron density of 1860 cm-3 and an average electron temperature of 12700 K. The use of infrared lines allows us to determine more accurate abundances than previously possible because abundances derived from infrared lines do not vary greatly with the adopted electron temperature and extinction, and additional ionization stages are observed. Elements left mostly unchanged by stellar evolution (Ar, Ne, S, and O) all have subsolar values in IC 2448, indicating that the progenitor star formed out of moderately metal deficient material. Evidence from the Spitzer spectrum of IC 2448 supports previous claims that IC 2448 is an old nebula formed from a low mass progenitor star.
description: 7 pages, 2 figures, accepted for publication in The Astrophysical Journal
Jan Bernhard Meister, Der Körper des Princeps. Zur Problematik eines monarchischen Körpers ohne Monarchie
Creators: name: Lambrecht, Ulrich
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Rezension zu: Jan Bernhard Meister, Der Körper des Princeps. Zur Problematik eines monarchischen Körpers ohne Monarchie. Historia-Einzelschriften 223. Stuttgart: Franz Steiner Verlag 2012, 327 S.
description: Göttinger Forum für Altertumswissenschaft, Bd. 16 (2013): Göttinger Forum für Altertumswissenschaft
Spent Convictions Use Case. Preliminary Notes.
Creators: name: Casanovas, Pompeu
name: de Koker, Louis
Publisher: name: Zenodo
Year: 2019
Subjects: Spent convictions legal scheme
Crimes Act 1914 Australia

description: This Deliverable includes the preliminary conceptual work and notes on Spent Convictions prior to its semi-automated modelling. DC3.1 introduces the subject. DC3.2 presents the clustering for the survey on legal compliance. DC3.3 presents the roadmap towards publishing law as data using Natural Language Processing (NLP) tools. DC3.4 describes in more detail the Spent Convictions Scheme (SCE). DC3.5 elaborates on the potential interpretative issues and impact of Crimes Act 1914 (Cth) – Part VIIC – Division 3: Sections 85ZV, 85ZW and Associated Definitions. DC3.6 analyses the case law perspective. DC3.7 carries out the semantic modelling of Spent Convictions in defeasible semantic logic. DC3.8 summarises and evaluates the legal findings of the Project. The present Deliverable: (i) introduces the use case on Spent Convictions; (ii) formulates the questions to be answered following the Spent Convictions Scheme; (iii) defines a preliminary legal framework; (iv) summarises some criticisms to the SCS formulated from the legal and criminological point of view by the doctrine.
description: DC25008: Compliance by Design (CbD) and Compliance through Design (CtD) solutions to support automated information sharing (2018-19). Law and Policy. Project C. Spent Convictions Use Case. Australian Government funded Data to Decisions Cooperative Research Centre (2018-2019), end-user: Australian Criminal Intelligence Commission.
Distinct Fermi-Momentum Dependent Energy Gaps in Deeply Underdoped Bi2212
Creators: name: Tanaka, Kiyohisa
name: Lee, W. S.
name: Lu, D. H.
name: Fujimori, A.
name: Fujii, T.
name: Risdiana
name: Terasaki, I.
name: Scalapino, D. J.
name: Devereaux, T. P.
name: Hussain, Z.
name: Shen, Z. -X.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We use angle-resolved photoemission spectroscopy applied to deeply underdoped cuprate superconductors Bi2Sr2(Ca,Y)Cu2O8 (Bi2212) to reveal the presence of two distinct energy gaps exhibiting different doping dependence. One gap, associated with the antinodal region where no coherent peak is observed, increases with underdoping - a behavior known for more than a decade and considered as the general gap behavior in the underdoped regime. The other gap, associated with the near nodal regime where a coherent peak in the spectrum can be observed, does not increase with less doping - a behavior not observed in the single particle spectra before. We propose a two-gap scenario in momentum space that is consistent with other experiments and may contain important information on the mechanism of high-Tc superconductivity.
description: 12 pages, 3 figures, submitted to Science
The consistency of chemical clocks among coeval stars
Creators: name: Espinoza-Rojas, Francisca
name: Chanamé, Julio
name: Jofré, Paula
name: Casamiquela, Laia
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The abundance ratios of some chemical species have been found to correlate with stellar age, leading to the possibility of using stellar atmospheric abundances as stellar age indicators. These chemical clocks have been calibrated with solar-twins, open clusters and red giants, but it remains to be seen whether they can be effective at identifying coeval stars in a field population that spans a broad parameter space (i.e., the promise of chemical tagging). Since the components of wide binaries are known to be stars of common origins, they constitute ideal laboratories for testing the usefulness of chemical clocks for the age dating of field stars. We determined the abundances of a new sample of 5 binaries and collected data for other 31 systems from the literature in order to test the applicability of chemical clocks. We recover the well known result that the components of wide binaries have more consistent chemistry than that of random pairs. However, we also show for the first time that abundance ratios designed as chemical clocks are even more consistent among the components of wide binaries than their [X/Fe] ratios. Not only that, but the special case of the pair HIP 34426/HIP 34407 may indicate that chemical clocks are consistent for coeval stars even when the individual abundances are not. If the assumption that chemical clocks are reliable age indicators is correct, this would constitute first quantitative, statistically significant evidence that the components of wide binaries in the Galactic field are indeed coeval, validating a large body of published work that relies on that to be the case. Moreover, our results provide strong evidence that chemical clocks indeed carry important information about stellar birthplaces and chemical evolution, and thus we propose that including them in chemical tagging efforts may facilitate the identification of nowadays dissolved stellar groups.
description: 16 pages, 9 figures. Accepted for publication in ApJ
Observational Evidence for Negative-Energy Dust in Late-Times Cosmology
Creators: name: Mavromatos, Nikolaos E.
name: Mitsou, Vasiliki A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We perform fits of unconventional dark energy models to the available data from high-redshift supernovae, distant galaxies and baryon oscillations. The models are based either on brane cosmologies or on Liouville strings in which a relaxation dark energy is provided by a rolling dilaton field (Q-cosmology). An interesting feature of such cosmologies is the possibility of effective four-dimensional negative-energy dust and/or exotic scaling of dark matter. An important constraint that can discriminate among models is the evolution of the Hubble parameter as a function of the redshift, H(z). We perform fits using a unifying formula for the evolution of H(z), applicable to different models. We find evidence for a negative-energy dust at the current era, as well as for exotic-scaling (a^{-delta}) contributions to the energy density, with 3.3
description: 21 pages LaTeX, 8 EPS figures incorporated
Allard W. Mees, Die Verbreitung von Terra Sigillata aus den Manufakturen von Arezzo, Pisa, Lyon und La Graufesenque. Die Transformation der italischen Sigillata-Herstellung in Gallien
Creators: name: Flecker, Manuel
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Rezension zu: Allard W. Mees, Die Verbreitung von Terra Sigillata aus den Manufakturen von Arezzo, Pisa, Lyon und La Graufesenque. Die Transformation der italischen Sigillata-Herstellung in Gallien. RGZM, Bd. 93. Regensburg: Schnell und Steiner Verlag 2012, 308 S., 213 s/w-Abb., 24 Farbabb.
description: Göttinger Forum für Altertumswissenschaft, Bd. 16 (2013): Göttinger Forum für Altertumswissenschaft
Center-stabilized Yang-Mills theory: confinement and large $N$ volume independence
Creators: name: Unsal, Mithat
name: Yaffe, Laurence G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We examine a double trace deformation of SU(N) Yang-Mills theory which, for large $N$ and large volume, is equivalent to unmodified Yang-Mills theory up to $O(1/N^2)$ corrections. In contrast to the unmodified theory, large $N$ volume independence is valid in the deformed theory down to arbitrarily small volumes. The double trace deformation prevents the spontaneous breaking of center symmetry which would otherwise disrupt large $N$ volume independence in small volumes. For small values of $N$, if the theory is formulated on $\R^3 \times S^1$ with a sufficiently small compactification size $L$, then an analytic treatment of the non-perturbative dynamics of the deformed theory is possible. In this regime, we show that the deformed Yang-Mills theory has a mass gap and exhibits linear confinement. Increasing the circumference $L$ or number of colors $N$ decreases the separation of scales on which the analytic treatment relies. However, there are no order parameters which distinguish the small and large radius regimes. Consequently, for small $N$ the deformed theory provides a novel example of a locally four-dimensional pure gauge theory in which one has analytic control over confinement, while for large $N$ it provides a simple fully reduced model for Yang-Mills theory. The construction is easily generalized to QCD and other QCD-like theories.
description: 29 pages, expanded discussion of multiple compactified dimensions