cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Eichler integrals and harmonic weak Maass forms
Creators: name: Choi, Dohoon
name: Kim, Byungchan
name: Lim, Subong
Publisher: name: arXiv
Year: 2012
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11F37, 32N10

description: Recently, K. Bringmann, P. Guerzhoy, Z. Kent and K. Ono studied the connection between Eichler integrals and the holomorphic parts of harmonic weak Maass forms on the full modular group. In this article, we extend their result to more general groups, namely, $H$-groups by employing the theory of supplementary functions introduced and developed by M. I. Knopp and S. Y. Husseini. In particular, we show that the set of Eichler integrals, which have polynomial period functions, is the same as the set of holomorphic parts of harmonic weak Maass forms of which the non-holomorphic parts are certain period integrals of cusp forms. From this we deduce relations among period functions for harmonic weak Maass forms.
Orientation and symmetries of Alexandrov spaces with applications in positive curvature
Creators: name: Harvey, John
name: Searle, Catherine
Publisher: name: arXiv
Year: 2012
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53C23, 53C20, 51K10

description: We develop two new tools for use in Alexandrov geometry: a theory of ramified orientable double covers and a particularly useful version of the Slice Theorem for actions of compact Lie groups. These tools are applied to the classification of compact, positively curved Alexandrov spaces with maximal symmetry rank.
description: 34 pages. Simplified proofs throughout and a new proof of the Slice Theorem, correcting omissions in the previous version
Fast matrix multiplication using coherent configurations
Creators: name: Cohn, Henry
name: Umans, Christopher
Publisher: name: arXiv
Year: 2012
Subjects: subject: Numerical Analysis (math.NA)
subject: Data Structures and Algorithms (cs.DS)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: We introduce a relaxation of the notion of tensor rank, called s-rank, and show that upper bounds on the s-rank of the matrix multiplication tensor imply upper bounds on the ordinary rank. In particular, if the "s-rank exponent of matrix multiplication" equals 2, then omega = 2. This connection between the s-rank exponent and the ordinary exponent enables us to significantly generalize the group-theoretic approach of Cohn and Umans, from group algebras to general algebras. Embedding matrix multiplication into general algebra multiplication yields bounds on s-rank (not ordinary rank) and, prior to this paper, that had been a barrier to working with general algebras. We identify adjacency algebras of coherent configurations as a promising family of algebras in the generalized framework. Coherent configurations are combinatorial objects that generalize groups and group actions; adjacency algebras are the analogue of group algebras and retain many of their important features. As with groups, coherent configurations support matrix multiplication when a natural combinatorial condition is satisfied, involving triangles of points in their underlying geometry. Finally, we prove a closure property involving symmetric powers of adjacency algebras, which enables us to prove nontrivial bounds on omega using commutative coherent configurations and suggests that commutative coherent configurations may be sufficient to prove omega = 2. Altogether, our results show that bounds on omega can be established by embedding large matrix multiplication instances into small commutative coherent configurations, while avoiding the representation-theoretic complications that were present in the group-theoretic approach.
description: 14 pages, Society for Industrial and Applied Mathematics
Comment on 'Operator formalism for the Wigner phase distribution'
Creators: name: Vaccaro, Joan A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The operator associated with the radially integrated Wigner function is found to lack justification as a phase operator.
description: 4 pages + 2 figures. A comment on the paper arXiv:1009.4030v1 by T. Subeesh and V. Sudhir. Updated to the accepted journal version
Tunable Thermal Switching via DNA-Based Nano Devices
Creators: name: Chien, Chih-Chun
name: Velizhanin, Kirill A.
name: Dubi, Yonatan
name: Zwolak, Michael
Publisher: name: arXiv
Year: 2012
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Biological Physics (physics.bio-ph)
subject: Biomolecules (q-bio.BM)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: DNA has a well-defined structural transition -- the denaturation of its double-stranded form into two single strands -- that strongly affects its thermal transport properties. We show that, according to a widely implemented model for DNA denaturation, one can engineer DNA "heattronic" devices that have a rapidly increasing thermal conductance over a narrow temperature range across the denaturation transition (~350 K). The origin of this rapid increase of conductance, or "switching", is the softening of the lattice and suppression of nonlinear effects as the temperature crosses the transition temperature and DNA denatures. Most importantly, we demonstrate that DNA nanojunctions have a broad range of thermal tunability due to varying the sequence and length, and exploiting the underlying nonlinear behavior. We discuss the role of disorder in the base sequence, as well as the relation to genomic DNA. These results set the basis for developing thermal devices out of materials with nonlinear structural dynamics, as well as understanding the underlying mechanisms of DNA denaturation.
description: 11+5 pages, 4 figures + 1 table
Cascade emission in electron beam ion trap plasma
Creators: name: Jonauskas, Valda
name: Masys, Šarūnas
name: Kynienė, Aušra
name: Gaigalas, Gediminas
Publisher: name: arXiv
Year: 2012
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We present investigation of the influence of cascade emission to the formation of spectra from plasma created by electron beam ion trap (EBIT) in electron trapping mode. It has been shown that cascade emission can play an important role in the formation of spectra from the EBIT plasma. Process of the cascade emission takes place when ion having cycloidal orbit leaves electron beam where coronal approximation is applicable. Thus both processes - excitation from ground or metastable levels and cascade emission - take part in the population of levels. Demonstration is based on the investigation of $W^{13+}$ spectra. The present investigation helps to resolve long-standing discrepancies; in particular, the present structure of $W^{13+}$ spectra is in good agreement with measurements on electron beam ion trap. Lines in the experimental spectra are identified as $4f^{13} 5s 5p \rightarrow 4f^{13} 5s^{2}$ and $4f^{12} 5s 5p^{2} \rightarrow 4f^{12} 5s^{2} 5p$ transitions from Dirac-Fock-Slater calculations.
AIMS Team Science Class Code of Conduct
Creators: name: Burgin, Amy J.
Publisher: name: figshare
Year: 2023
Subjects: Environmental education curriculum and pedagogy
Science, technology and engineering curriculum and pedagogy

description: This is the Code of Conduct document that the AIMS Team Science course co-developed early in the semester to set the rules and norms for class interaction. This document is being posted in conjunction with a manuscript by Peterson and co-authors in Ecology and Evolution Academic Practice as a resource to other big projects.
Group descent algorithms for nonconvex penalized linear and logistic regression models with grouped predictors
Creators: name: Breheny, Patrick
name: Huang, Jian
Publisher: name: arXiv
Year: 2012
Subjects: subject: Computation (stat.CO)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: Penalized regression is an attractive framework for variable selection problems. Often, variables possess a grouping structure, and the relevant selection problem is that of selecting groups, not individual variables. The group lasso has been proposed as a way of extending the ideas of the lasso to the problem of group selection. Nonconvex penalties such as SCAD and MCP have been proposed and shown to have several advantages over the lasso; these penalties may also be extended to the group selection problem, giving rise to group SCAD and group MCP methods. Here, we describe algorithms for fitting these models stably and efficiently. In addition, we present simulation results and real data examples comparing and contrasting the statistical properties of these methods.
Antike als Vorbild und Gegensatz: Wertekonflikte und die kritische Auseinandersetzung mit der antiken Kultur im Lateinunterricht
Creators: name: Lorenz, Sven
Publisher: name: Pegasus-Onlinezeitschrift
Year: 2019

description: Die in zahlreichen antiken Quellen vertretene Einstellung zu Krieg und Gewalt, zur Sklaverei oder auch zur Rolle der Frau in der Gesellschaft lassen sich nur schwer mit unseren heutigen mitteleuropäischen Vorstellungen vom Zusammenleben in Einklang bringen. So kann es, wenn wir uns im Lateinunterricht mit diesen Aspekten der römischen Gesellschaft und Kultur beschäftigen, zu Wertekonflikten kommen. Die kritische und gleichzeitig sachlich fundierte Auseinandersetzung damit kann unseren Schülerinnen und Schülern helfen, sowohl die römische Kultur als auch ihre eigene Lebenswelt besser zu verstehen. Unter anderem kann der Lateinunterricht so einen wertvollen Beitrag zur politischen Bildung leisten.
description: Pegasus-Onlinezeitschrift, Bd. 18 (2018): Pegasus-Onlinezeitschrift
Die Verteidigung der Einzelfallkontrolle bei der kollisionsrechtlichen Wirksamkeitsprüfung ausländischer Mehrehen
Creators: name: Schnetter, Marcus
Publisher: name: Studentische Zeitschrift für Rechtswissenschaft Heidelberg – Wissenschaft Online
Year: 2019

description: Die kollisionsrechtliche Wirksamkeitsprüfung ausländischer Mehrehen setzt voraus, dass der konkrete Einzelfall geprüft wird. Es genügt entgegen der von Pointner vertretenen Auffassung nicht, abstrakt das Rechtsinstitut der Mehrehe als unvereinbar mit der deutschen Rechtsordnung zu qualifizieren. Vielmehr muss in einer konkreten Einzelfallprüfung zwischen den Interessen der betroffenen EhegattInnen an der Wirksamkeit ihrer Ehe auf der einen Seite und der Durchsetzung des Gebots der Einehe auf der anderen Seite abgewogen werden. Der ordre public-Vorbehalt ermöglicht in seiner bestehenden Auslegung eine sachgerechte Entscheidung durch die Gerichte. Diese Auslegung trägt den grundlegenden Strukturprinzipien und Zielen des IPR angemessen Rechnung.
description: Studentische Zeitschrift für Rechtswissenschaft Heidelberg – Wissenschaft Online, Nr. 1 (2018): StudZR-WissOn
Gegendarstellung zur Rezension von H. Stubbe-da-Luz des Werkes: A. Ernst, Die Einführung des napoleonischen Steuer- und Verwaltungssystems in Lüneburg 1810/1811 unter Ablösung der alten Rechtsnormen, 2004 (A. Ernst)
Creators: name: Ernst, Angelika
Publisher: name: Francia
Year: 2018

description: Francia, Bd. 34 Nr. 2 (2007)
Cross time-bin photonic entanglement for quantum key distribution
Creators: name: Martin, A.
name: Kaiser, F.
name: Vernier, A.
name: Beveratos, A.
name: Scarani, V.
name: Tanzilli, S.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We report a fully fibered source emitting cross time-bin entangled photons at 1540 nm from type-II spontaneous parametric down conversion. Compared to standard time-bin entanglement realizations, the preparation interferometer requires no phase stabilization, simplifying its implementation in quantum key distribution experiments. Franson/Bell-type tests of such a cross time-bin state are performed and lead to two-photon interference raw visibilities greater than 95%, which are only limited by the dark-counts in the detectors and imperfections in the analysis system. Just by trusting the randomness of the beam-splitters, the correlations generated by the source can be proved of non-classical origin even in a passive implementation. The obtained results confirm the suitability of this source for time-bin based quantum key distribution.
description: 5 pages, double column, 3 captioned figures
Bound-states and polarized charged zero modes in three-dimensional topological insulators induced by a magnetic vortex
Creators: name: Fonseca, Jakson M.
name: Moura-Melo, Winder A.
name: Pereira, Afranio R.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: By coating a three-dimensional topological insulator (TI) with a ferromagnetic film supporting an in-plane magnetic vortex, one breaks the time-reversal symmetry (TRS) without generating a mass gap. It rather yields electronic states bound to the vortex center which have different probabilities associated with each spin mode. In addition, its associate current (around the vortex center) is partially polarized with an energy gap separating the most excited bound state from the scattered ones. Charged zero-modes also appear as fully polarized modes localized near the vortex center. From the magnetic point of view, the observation of such a special current in a TI-magnet sandwich comes about as an alternative technique for detecting magnetic vortices in magnetic thin films.
description: 8 pages, 3 figures, new version with more discussions and results accepted for publication in The European Physical Journal B
A Max-Product EM Algorithm for Reconstructing Markov-tree Sparse Signals from Compressive Samples
Creators: name: Song, Zhao
name: Dogandzic, Aleksandar
Publisher: name: arXiv
Year: 2012
Subjects: subject: Machine Learning (stat.ML)
subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: We propose a Bayesian expectation-maximization (EM) algorithm for reconstructing Markov-tree sparse signals via belief propagation. The measurements follow an underdetermined linear model where the regression-coefficient vector is the sum of an unknown approximately sparse signal and a zero-mean white Gaussian noise with an unknown variance. The signal is composed of large- and small-magnitude components identified by binary state variables whose probabilistic dependence structure is described by a Markov tree. Gaussian priors are assigned to the signal coefficients given their state variables and the Jeffreys' noninformative prior is assigned to the noise variance. Our signal reconstruction scheme is based on an EM iteration that aims at maximizing the posterior distribution of the signal and its state variables given the noise variance. We construct the missing data for the EM iteration so that the complete-data posterior distribution corresponds to a hidden Markov tree (HMT) probabilistic graphical model that contains no loops and implement its maximization (M) step via a max-product algorithm. This EM algorithm estimates the vector of state variables as well as solves iteratively a linear system of equations to obtain the corresponding signal estimate. We select the noise variance so that the corresponding estimated signal and state variables obtained upon convergence of the EM iteration have the largest marginal posterior distribution. We compare the proposed and existing state-of-the-art reconstruction methods via signal and image reconstruction experiments.
description: To appear in IEEE Transactions on Signal Processing
Charge losses in segmented silicon sensors at the Si-SiO2 interface
Creators: name: Poehlsen, Thomas
name: Fretwurst, Eckhart
name: Klanner, Robert
name: Schuwalow, Sergej
name: Schwandt, Jörn
name: Zhang, Jiaguo
Publisher: name: arXiv
Year: 2012
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: Using multi-channel time-resolved current measurements (multi TCT), the charge collection of p+n silicon strip sensors for electron-hole pairs produced close to the Si-SiO2 interface by a focussed sub-nanosecond laser with a wavelength of 660 nm has been studied. Sensors before and after irradiation with 1 MGy of X-rays have been investigated. The charge signals induced in the readout strips and the rear electrode as a function of the position of the light spot are described by a model which allows a quantitative determination of the charge losses and of the widths of the electron-accumulation and hole-inversion layers close to the Si-SiO2 interface. Depending on the applied bias voltage, biasing history and environmental conditions, like humidity, incomplete electron or hole collection and different widths of the accumulation layers are observed. In addition, the results depend on the time after biasing the sensor, with time constants which can be as long as days. The observations are qualitatively explained with the help of detailed sensor simulations. Finally, their relevance for the detection of X-ray photons and charged particles, and for the stable operation of segmented p+n silicon sensors is discussed.
Gravitational wave emission and spindown of young pulsars
Creators: name: Alford, Mark G.
name: Schwenzer, Kai
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The rotation frequencies of young pulsars are systematically below their theoretical Kepler limit. R-modes have been suggested as a possible explanation for this observation. With the help of semi-analytic expressions that make it possible to assess the uncertainties of the r-mode scenario due to the impact of uncertainties in underlying microphysics, we perform a quantitative analysis of the spin-down and the emitted gravitational waves of young pulsars. We find that the frequency to which r-modes spin down a young neutron star is surprisingly insensitive both to the microscopic details and the saturation amplitude. Comparing our result to astrophysical data, we show that for a range of sufficiently large saturation amplitudes r-modes provide a viable spindown scenario and that all observed young pulsars are very likely already outside the r-mode instability region. Therefore the most promising sources for gravitational wave detection are unobserved neutron stars associated with recent supernovae, and we find that advanced LIGO should be able to see several of them. We find the remarkable result that the gravitational wave strain amplitude is completely independent of both the r-mode saturation amplitude and the microphysics, and depends on the saturation mechanism only within some tens of per cent. However, the gravitational wave frequency depends on the amplitude and we provide the required expected timing parameter ranges to look for promising sources in future searches.
description: 26 pages, 10 figures, largely extended and revised version
Proto-groups at 1.8
Creators: name: Diener, C.
name: Lilly, S. J.
name: Knobel, C.
name: Zamorani, G.
name: Lemson, G.
name: Kampczyk, P.
name: Scoville, N.
name: Carollo, C. M.
name: Contini, T.
name: Kneib, J. -P.
name: Fevre, O. Le
name: Mainieri, V.
name: Renzini, A.
name: Scodeggio, M.
name: Bardelli, S.
name: Bolzonella, M.
name: Bongiorno, A.
name: Caputi, K.
name: Cucciati, O.
name: de la Torre, S.
name: de Ravel, L.
name: Franzetti, P.
name: Garilli, B.
name: Iovino, A.
name: Kovač, K.
name: Lamareille, F.
name: Borgne, J. -F. Le
name: Brun, V. Le
name: Maier, C.
name: Mignoli, M.
name: Pello, R.
name: Peng, Y.
name: Montero, E. Perez
name: Presotto, V.
name: Silverman, J.
name: Tanaka, M.
name: Tasca, L.
name: Tresse, L.
name: Vergani, D.
name: Zucca, E.
name: Bordoloi, R.
name: Cappi, A.
name: Cimatti, A.
name: Coppa, G.
name: Koekemoer, A. M.
name: López-Sanjuan, C.
name: McCracken, H. J.
name: Moresco, M.
name: Nair, P.
name: Pozzetti, L.
name: Welikala, N.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We identify 42 candidate groups lying between 1.8
Titelei
Creators: name: Redaktion, Die
Publisher: name: Kunstchronik. Monatsschrift für Kunstwissenschaft, Museumswesen und Denkmalpflege
Year: 2019

description: Kunstchronik. Monatsschrift für Kunstwissenschaft, Museumswesen und Denkmalpflege, Vol 3 No 1 (1950): Kunstchronik. Monatsschrift für Kunstwissenschaft, Museumswesen und Denkmalpflege
A next generation Ultra-Fast Flash Observatory (UFFO-100) for IR/optical observations of the rise phase of gamma-ray bursts
Creators: name: Grossan, B.
name: Park, I. H.
name: Ahmad, S.
name: Ahn, K. B.
name: Barrillon, P.
name: Brandt, S.
name: Budtz-Jørgensen, C.
name: Castro-Tirado, A. J.
name: Chen, P.
name: Choi, H. S.
name: Choi, Y. J.
name: Connell, P.
name: Dagoret-Campagne, S.
name: De La Taille, C.
name: Eyles, C.
name: Hermann, I.
name: Huang, M. -H. A.
name: Jung, A.
name: Jeong, S.
name: Kim, J. E.
name: Kim, M.
name: Kim, S. -W.
name: Kim, Y. W.
name: Lee, J.
name: Lim, H.
name: Linder, E. V.
name: Liu, T. -C.
name: Lund, N.
name: Min, K. W.
name: Na, G. W.
name: Nam, J. W.
name: Panasyuk, M. I.
name: Ripa, J.
name: Reglero, V.
name: Rodrigo, J. M.
name: Smoot, G. F.
name: Suh, J. E.
name: Svertilov, S.
name: Vedenkin, N.
name: Wang, M. -Z.
name: Yashin, I.
name: Zhao, M. H.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The Swift Gamma-ray Burst (GRB) observatory responds to GRB triggers with optical observations in ~ 100 s, but cannot respond faster than ~ 60 s. While some ground-based telescopes respond quickly, the number of sub-60 s detections remains small. In mid- to late-2013, the Ultra-Fast Flash Observatory-Pathfinder is to be launched on the Lomonosov spacecraft to investigate early optical GRB emission. This pathfinder mission is necessarily limited in sensitivity and event rate; here we discuss a next generation rapid-response space observatory. We list science topics motivating our instruments, those that require rapid optical-IR GRB response, including: A survey of GRB rise shapes/times, measurements of optical bulk Lorentz factors, investigation of magnetic dominated (vs. non-magnetic) jet models, internal vs. external shock origin of prompt optical emission, the use of GRBs for cosmology, and dust evaporation in the GRB environment. We also address the impacts of the characteristics of GRB observing on our instrument and observatory design. We describe our instrument designs and choices for a next generation observatory as a second instrument on a low-earth orbit spacecraft, with a 120 kg instrument mass budget. Restricted to relatively modest mass and power, we find that a coded mask X-ray camera with 1024 cm2 of detector area could rapidly locate about 64 GRB triggers/year. Responding to the locations from the X-ray camera, a 30 cm aperture telescope with a beam-steering system for rapid (~ 1 s) response and a near-IR camera should detect ~ 29 GRB, given Swift GRB properties. Am additional optical camera would give a broadband optical-IR slope, allowing dynamic measurement of dust extinction at the source, for the first time.
description: 12 pages, 11 figures, submitted to SPIE 2012 Amsterdam conference proceedings
Wiedereröffnung des Kurpfälzischen Museums zu Heidelberg
Creators: name: Poensgen, Georg
Publisher: name: Kunstchronik. Monatsschrift für Kunstwissenschaft, Museumswesen und Denkmalpflege
Year: 2019

description: Kunstchronik. Monatsschrift für Kunstwissenschaft, Museumswesen und Denkmalpflege, Vol 3 No 1 (1950): Kunstchronik. Monatsschrift für Kunstwissenschaft, Museumswesen und Denkmalpflege
2. Deutscher Kunsthistorikertag
Creators: name: Redaktion, Die
Publisher: name: Kunstchronik. Monatsschrift für Kunstwissenschaft, Museumswesen und Denkmalpflege
Year: 2019

description: Kunstchronik. Monatsschrift für Kunstwissenschaft, Museumswesen und Denkmalpflege, Vol 3 No 1 (1950): Kunstchronik. Monatsschrift für Kunstwissenschaft, Museumswesen und Denkmalpflege
Pädagogische Arbeit in den Museen der USA
Creators: name: Heydenreich, Ludwig Heinrich
Publisher: name: Kunstchronik. Monatsschrift für Kunstwissenschaft, Museumswesen und Denkmalpflege
Year: 2019

description: Kunstchronik. Monatsschrift für Kunstwissenschaft, Museumswesen und Denkmalpflege, Bd. 3 Nr. 2 (1950): Kunstchronik. Monatsschrift für Kunstwissenschaft, Museumswesen und Denkmalpflege
Self-consistent tomography of the state-measurement Gram matrix
Creators: name: Stark, Cyril
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: State and measurement tomography make assumptions about the experimental states or measurements. These assumptions are often not justified because state preparation and measurement errors are unavoidable in practice. Here we describe how the Gram matrix associated with the states and measurement operators can be estimated via semidefinite programming if the states and the measurements are so called globally completable. This is for instance the case if the unknown measurements are known to be projective and non-degenerate. The computed Gram matrix determines the states, and the measurement operators uniquely up to simultaneous rotations in the space of Hermitian matrices. We prove the reliability of the proposed method in the limit of a large number of independent measurement repetitions.
description: We have completely rewritten the first version because new results from arXiv:1209.6499 allowed to significantly clearify the first submission. We have added some references
Enhanced thermal photon and dilepton production in strongly coupled N=4 SYM plasma in strong magnetic field
Creators: name: Mamo, Kiminad A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We calculate the DC conductivity tensor of strongly coupled N=4 super-Yang-Mills (SYM) plasma in a presence of a strong external magnetic field B>>T^2 by using its gravity dual and employing both the RG flow approach and membrane paradigm which give the same results. We find that, since the magnetic field B induces anisotropy in the plasma, different components of the DC conductivity tensor have different magnitudes depending on whether its components are in the direction of the magnetic field B. In particular, we find that a component of the DC conductivity tensor in the direction of the magnetic field B increases linearly with B while the other components (which are not in the direction of the magnetic field B) are independent of it. These results are consistent with the lattice computations of the DC conductivity tensor of the QCD plasma in an external magnetic field B. Using the DC conductivity tensor, we calculate the soft or low-frequency thermal photon and dilepton production rates of the strongly coupled N=4 SYM plasma in the presence of the strong external magnetic field B>>T^2. We find that the strong magnetic field B enhances both the thermal photon and dilepton production rates of the strongly coupled N=4 SYM plasma in a qualitative agreement with the experimentally observed enhancements at the heavy-ion collision experiments.
description: 22 pages, 7 figures, published version in JHEP
Die Bedeutung des völkerrechtlichen Rechts auf Freizügigkeit für den Flüchtlingsschutz
Creators: name: Mührel, Jasper
Publisher: name: Studentische Zeitschrift für Rechtswissenschaft Heidelberg – Wissenschaft Online
Year: 2019

description: In Zeiten von Klimawandel, Krieg und wirtschaftlichem Stillstand begeben sich immer mehr Menschen auf die Flucht in der Hoffnung auf eine (bessere) Zukunft. Fragen des Umgangs mit Migration bestimmen weltweit die politischen Debatten, in denen häufig anhand des völkerrechtlichen Flüchtlingsstatus argumentiert wird. Regelmäßig unberücksichtigt bleibt dabei das völkerrechtliche Recht auf Freizügigkeit. Dieser Beitrag beleuchtet Geschichte, Inhalt und Reichweite des völkerrechtlichen Rechts auf Freizügigkeit im Hinblick auf den Flüchtlingsschutz. Darüber hinaus geht er den Fragen nach, in welchen Situationen das Freizügigkeitsrecht Bedeutung für den Flüchtlingsschutz erlangt und wie es sich im jahrhundertealten Spannungsverhältnis zwischen Gastrecht und umfassender staatlicher Souveränität positioniert. In times of climate change, war and economic gridlock, increasing numbers of people seek refuge by using their ability of free movement in hope for a better future. Questions about how to handle migration dominate political debates worldwide, in which arguments often relate to the refugee status under international law. Often, the right to freedom of movement under international law remains unconsidered. This article focuses on the history, content and extent of the right to freedom of movement under international law and its relevance for the protection of refugees. Moreover, it seeks to take a stand regarding the right to freedom of movement’s position within the centuries old tension between a right to hospitality and extensive state sovereignty.
description: Studentische Zeitschrift für Rechtswissenschaft Heidelberg – Wissenschaft Online, Nr. 1 (2018): StudZR-WissOn
On the Cluster Physics of Sunyaev-Zel'dovich and X-ray Surveys III: Measurement Biases and Cosmological Evolution of Gas and Stellar Mass Fractions
Creators: name: Battaglia, N.
name: Bond, J. R.
name: Pfrommer, C.
name: Sievers, J. L.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Gas masses tightly correlate with the virial masses of galaxy clusters, allowing for a precise determination of cosmological parameters by means of large-scale X-ray surveys. However, according to recent Suzaku X-ray measurements, gas mass fractions, f_gas, appear to be considerably larger than the cosmic mean at the virial radius, R_200, questioning the accuracy of the cosmological parameter estimations. Here, we use a large suite of cosmological hydrodynamical simulations to study measurement biases of f_gas. We employ different variants of simulated physics, including radiative gas physics, star formation, and thermal feedback by active galactic nuclei. Computing the mass profiles in 48 angular cones, whose footprints partition the sphere, we find anisotropic gas and total mass distributions that imply an angular variance of f_gas at the level of 30%. This anisotropic distribution originates from the recent formation epoch of clusters and from the strong internal baryon-to-dark-matter density bias. In the most extreme cones, f_gas can be biased high by a factor of two at R_200 in massive clusters, thereby providing a potential explanation for high f_gas measurements by Suzaku. While projection lowers this factor, there are other measurement biases that may (partially) compensate. We find that at R_200, f_gas is biased high by 20% when assuming hydrostatic equilibrium masses, i.e., neglecting the kinetic pressure, and by another ~10-20% due to the presence of density clumping. At larger radii, both measurement biases increase dramatically. While the cluster sample variance of the true f_gas decreases to a level of 5% at R_200, the sample variance that includes both measurement biases remains fairly constant at the level of 10-20%. The constant redshift evolution of f_gas within R_500 for massive clusters is encouraging for using gas masses to derive cosmological parameters.
description: Accepted by ApJ, 24 pages, 17 figures, this version additionally includes projection effects, an improved discussion of hydrostatic equilibrium masses, and compares our simulation results to more data
Maria Sipsie-Eschbach, Protogeometrische Keramik aus Iolkos in Thessalien
Creators: name: Jacob-Felsch, Margrit
Publisher: name: Bonner Jahrbücher
Year: 2019

description: Rezension zu: Maria Sipsie-Eschbach, Protogeometrische Keramik aus Iolkos in Thessalien. Prähistorische Archäologie in Südosteuropa, Band 8. Wissenschaftsverlag Volker Spiess, Berlin 1991. 240 Seiten, 26 Abbildungen im Text, 71 Tafeln
description: Bonner Jahrbücher, Bd. 194.1994 (1995): Bonner Jahrbücher
title: "Fictual" Reportage and (Virtual) Reality: Truman Capote's In Cold Blood and Norman Mailer's The Executioner's Song
Creators: name: Mahmoud, Rania M.
Publisher: name: Old Dominion University
publisherIdentifier: https://ror.org/04zjtrb98
publisherIdentifierScheme: ROR
Year: 2004

description: This study discusses Truman Capote's In Cold Blood and Norman Mailer's The Executioner's Song. using Jean Baudrillard's theory of the four stages of the image and John Hellmann's notion of the transforming power of consciousness. Examining two landmarks of what is widely referred to as the nonfiction novel, or creative nonfiction, the study suggests that any attempt to record reality ends up as fabulation, whereby the writer produces his/her own version of reality. Thus, we have multiple realities or, in other words, fables woven out of the interpretive consciousness of individual writers. Taking this a step further, since all our actions are attempts to act up to, or against, our characters, our whole life becomes simulation, a virtual reality show. In each of the books I discuss, characters reflect on the "unreality" of their actions. They feel as though they have been acting in a film. They also try to please either an audience or themselves. Thus, they become participants in a virtual reality show. The books, too, become shows since in order for us to know the end of the stories, the characters need to carry out their actions. The term fictional reportage is, therefore, suggested as a fit descriptor for a genre that attempts to recreate reality as accurately as possible and ends up as fabulation and simulation.
Probabilistic Particle Flow Algorithm for High Occupancy Environment
Creators: name: Elagin, Andrey
name: Murat, Pavel
name: Pranko, Alexandre
name: Safonov, Alexei
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Algorithms based on the particle flow approach are becoming increasingly utilized in collider experiments due to their superior jet energy and missing energy resolution compared to the traditional calorimeter-based measurements. Such methods have been shown to work well in environments with low occupancy of particles per unit of calorimeter granularity. However, at higher instantaneous luminosity or in detectors with coarse calorimeter segmentation, the overlaps of calorimeter energy deposits from charged and neutral particles significantly complicate particle energy reconstruction, reducing the overall energy resolution of the method. We present a technique designed to resolve overlapping energy depositions of spatially close particles using a statistically consistent probabilistic procedure. The technique is nearly free of ad-hoc corrections, improves energy resolution, and provides new important handles that can improve the sensitivity of physics analyses: the uncertainty of the jet energy on an event-by-event basis and the estimate of the probability of a given particle hypothesis for a given detector response. When applied to the reconstruction of hadronic jets produced in the decays of tau leptons using the CDF-II detector at Fermilab, the method has demonstrated reliable and robust performance.
description: Accepted by Nuclear Instruments and Methods A
Modular Constraints on Calabi-Yau Compactifications
Creators: name: Keller, Christoph A.
name: Ooguri, Hirosi
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Algebraic Geometry (math.AG)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We derive global constraints on the non-BPS sector of supersymmetric 2d sigma-models whose target space is a Calabi-Yau manifold. When the total Hodge number of the Calabi-Yau threefold is sufficiently large, we show that there must be non-BPS primary states whose total conformal weights are less than 0.656. Moreover, the number of such primary states grows at least linearly in the total Hodge number. We discuss implications of these results for Calabi-Yau geometry.
description: 24 pages, 5 figures; v3: corrected typos and an error in the asymptotic bound. Version to appear in CMP
Intraband absorption in finite, inhomogeneous quantum dot stacks for intermediate band solar cells: limitations and optimization
Creators: name: Bragar, Igor
name: Machnikowski, Paweł
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We present a theoretical analysis of intraband optical transitions from the intermediate pseudo-band of confined states to the conduction band in a finite, inhomogeneous stack of self-assembled semiconductor quantum dots. The chain is modeled with an effective Hamiltonian including nearest-neighbor tunnel couplings and the absorption under illumination with both coherent (laser) and thermal radiation is discussed. We show that the absorption spectrum already for a few coupled dots differs from that of a single dot and develops a structure with additional maxima at higher energies. We find out that this leads to an enhancement of the overall transition rate under solar illumination by up to several per cent which grows with the number of QDs but saturates already for a few QDs in the chain. The decisive role of the strength of inter-dot coupling for the stability of this enhancement against QD stack inhomogeneity and temperature is revealed.
description: Moderate modifications, one new figure
Sebastian Storz, Tonröhren im antiken Gewölbebau. Mit einer Rekonstruktion des Schalungstragwerkes für die Trompengewölbe der Kobbat Bent el Rey in Karthago
Creators: name: Polónyi, Stefan
Publisher: name: Bonner Jahrbücher
Year: 2019

description: Rezension zu: Sebastian Storz, Tonröhren im antiken Gewölbebau. Mit einer Rekonstruktion des Schalungstragwerkes für die Trompengewölbe der Kobbat Bent el Rey in Karthago. Deutsches Archäologisches Institut Rom, Sonderschriften Band 10. Verlag Philipp von Zabern, Mainz 1994. 110 Seiten, 11 Abbildungen im Text, 32 Tafeln mit 105 Abbildungen, 19 Beilagen
description: Bonner Jahrbücher, Bd. 194.1994 (1995): Bonner Jahrbücher
Corpus der römischen Funde im europäischen Barbaricum. Deutschland, Band 1: Bundesländer Brandenburg und Berlin
Creators: name: Wielowiejski, Jerzy
Publisher: name: Bonner Jahrbücher
Year: 2019

description: Rezension zu: Corpus der römischen Funde im europäischen Barbaricum. Deutschland, Band 1: Bundesländer Brandenburg und Berlin. Bearbeitet von Rudolf Laser und Elans-Ulrich Voß unter Mitwirkung von FI. Geisler, S. Gustavs, FI. Keiling, A. Leube, F. Sârâţeanu-Müller, E. Schultze, H. Stange und I. Wetzel. Dr. Rudolf Habelt GmbH, Bonn 1994. 124 Seiten, 20 Tafeln, 1 Karte
description: Bonner Jahrbücher, Bd. 196.1996(1997): Bonner Jahrbücher
X-ray magnetic circular dichroism in (Ge,Mn) compounds: experiments and modeling
Creators: name: Tardif, Samuel
name: Titov, Andrey
name: Arras, Emmanuel
name: Slipukhina, Ivetta
name: Hlil, El-Kebir
name: Cherifi, Salia
name: Joly, Yves
name: Jamet, Matthieu
name: Barski, André
name: Cibert, Joel
name: Kulatov, Erkin
name: Uspenskii, Y. A.
name: Pochet, Pascal
Publisher: name: arXiv
Year: 2012
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: X-ray absorption (XAS) and x-ray magnetic circular dichroism (XMCD) spectra at the L$_{2,3}$ edges of Mn in (Ge,Mn) compounds have been measured and are compared to the results of first principles calculation. Early \textit{ab initio} studies show that the Density Functional Theory (DFT) can very well describe the valence band electronic properties but fails to reproduce a characteristic change of sign in the L$_{3}$ XMCD spectrum of Mn in Ge$_3$Mn$_5$, which is observed in experiments. In this work we demonstrate that this disagreement is partially related to an underestimation of the exchange splitting of Mn 2$p$ core states within the local density approximation. It is shown that the change in sign experimentally observed is reproduced if the exchange splitting is accurately calculated within the Hartree-Fock approximation, while the final states can be still described by the DFT. This approach is further used to calculate the XMCD in different (Ge,Mn) compounds. It demonstrates that the agreement between experimental and theoretical spectra can be improved by combining state of the art calculations for the core and valence states respectively.
description: 8 pages
David Cohen und Elisabeth Müller-Luckner (Hrsg.), Demokratie, Recht und soziale Kontrolle im klassischen Athen
Creators: name: Schmitz, Winfried
Publisher: name: Bonner Jahrbücher
Year: 2019

description: Rezension zu: David Cohen und Elisabeth Müller-Luckner (Hrsg.), Demokratie, Recht und soziale Kontrolle im klassischen Athen. Schriften des Historischen Kollegs, Kolloquien 49. Oldenbourg Wissenschaftsverlag, München 2002. XI, 205 Seiten
description: Bonner Jahrbücher, Bd. 202/203.2002/2003(2005): Bonner Jahrbücher
Bounds for the Rayleigh quotient and the spectrum of self-adjoint operators
Creators: name: Zhu, Peizhen
name: Argentati, Merico E.
name: Knyazev, Andrew V.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Numerical Analysis (math.NA)
subject: Functional Analysis (math.FA)
subject: Spectral Theory (math.SP)
subject: FOS: Mathematics
subject: 15A42, 15A60, 65F35

description: The absolute change in the Rayleigh quotient (RQ) is bounded in this paper in terms of the norm of the residual and the change in the vector. If $x$ is an eigenvector of a self-adjoint bounded operator $A$ in a Hilbert space, then the RQ of the vector $x$, denoted by $ρ(x)$, is an exact eigenvalue of $A$. In this case, the absolute change of the RQ $|ρ(x)-ρ(y)|$ becomes the absolute error in an eigenvalue $ρ(x)$ of $A$ approximated by the RQ $ρ(y)$ on a given vector $y.$ There are three traditional kinds of bounds of the eigenvalue error: a priori bounds via the angle between vectors $x$ and $y$; a posteriori bounds via the norm of the residual $Ay-ρ(y)y$ of vector $y$; mixed type bounds using both the angle and the norm of the residual. We propose a unifying approach to prove known bounds of the spectrum, analyze their sharpness, and derive new sharper bounds. The proof approach is based on novel RQ vector perturbation identities.
description: 13 pages
A comparative study of jet substructure taggers
Creators: name: Quiroga-Arias, Paloma
name: Sapeta, Sebastian
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We explicitly study how jet substructure taggers act on a set of signal and background events. We focus on two-pronged hadronic decay of a boosted Z boson. The background to this process comes from QCD jets with masses of the order of m_Z. We find a way to compare various taggers within a single framework by applying them to the most relevant splitting in a jet. We develop a tool, TOY-TAG, which allows one to get insight into what happens when a particular tagger is applied to a set of signal or background events. It also provides estimates for significance and purity. We use our tool to analyze differences between various taggers and potential ways to improve the performance by combining several of them.
description: 16 pages, 8 figures; v3: fig. 3 improved, small textual changes, version accepted by Int.J.Mod.Phys. A
Degeneracy and criticality from emergent frustration in artificial spin ice
Creators: name: Chern, Gia-Wei
name: Morrison, Muir J.
name: Nisoli, Cristiano
Publisher: name: arXiv
Year: 2012
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Although initially introduced to mimic the spin-ice pyrochlores, no artificial spin ice has yet exhibited the expected degenerate ice-phase with critical correlations similar to the celebrated Coulomb phase in the pyrochlore lattice. Here we study a novel artificial spin ice based on a vertex-frustrated rather than pairwise frustrated geometry and show that it exhibits a quasicritical ice phase of extensive residual entropy and, significantly, algebraic correlations. Interesting in its own regard as a novel realization of frustration in a vertex system, our lattice opens new pathways to study defects in a critical manifold and to design degeneracy in artificial magnetic nanoarrays, a task so far elusive.
description: 7 pages, 8 figures
The Museum Opens
Creators: name: Drucker, Johanna
Publisher: name: International Journal for Digital Art History
Year: 2019

description: This speculative fiction narrates the experience of a virtual museum environment in the near future. The description extends current capabilities of linked data, visualization, and computational analytics while adding features of virtual and augmented reality. The essay takes a skeptical view of the increased spectacularization of cultural memory experience even as it explores the potential for enriched research, pedagogy, and public knowledge that emerging technological platforms may provide.
description: International Journal for Digital Art History, No 4 (2019): Transformation of Institutions
Dynamical eigenfunctions and critical density in loop quantum cosmology
Creators: name: Craig, David A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We offer a new, physically transparent argument for the existence of the critical, universal maximum matter density in loop quantum cosmology for the case of a flat Friedmann-Lemaitre-Robertson-Walker cosmology with scalar matter. The argument is based on the existence of a sharp exponential ultraviolet cutoff in momentum space on the eigenfunctions of the quantum cosmological dynamical evolution operator (the gravitational part of the Hamiltonian constraint), attributable to the fundamental discreteness of spatial volume in loop quantum cosmology. The existence of the cutoff is proved directly from recently found exact solutions for the eigenfunctions for this model. As a consequence, the operators corresponding to the momentum of the scalar field and the spatial volume approximately commute. The ultraviolet cutoff then implies that the scalar momentum, though not a bounded operator, is in effect bounded on subspaces of constant volume, leading to the upper bound on the expectation value of the matter density. The maximum matter density is universal (i.e. independent of the quantum state) because of the linear scaling of the cutoff with volume. These heuristic arguments are supplemented by a new proof in the volume representation of the existence of the maximum matter density. The techniques employed to demonstrate the existence of the cutoff also allow us to extract the large volume limit of the exact eigenfunctions, confirming earlier numerical and analytical work showing that the eigenfunctions approach superpositions of the eigenfunctions of the Wheeler-DeWitt quantization of the same model. We argue that generic (not just semiclassical) quantum states approach symmetric superpositions of expanding and contracting universes.
description: 23 pages, 8 figures. Minor corrections throughout. Significant improvement to key figure illustrating behavior of the eigenfunctions. Version to appear in Classical and Quantum Gravity