cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The Integrable (Hyper)eclectic Spin Chain
Creators: name: Ahn, Changrim
name: Staudacher, Matthias
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We refine the recently introduced notion of eclectic spin chains by including a maximal number of deformation parameters. These models are integrable, nearest-neighbor n-state spin chains with exceedingly simple non-hermitian Hamiltonians. They turn out to be non-diagonalizable in the multiparticle sector (n>2), where their "spectrum" consists of an intricate collection of Jordan blocks of arbitrary size and multiplicity. We show how and why the quantum inverse scattering method, sought to be universally applicable to integrable nearest-neighbor spin chains, essentially fails to reproduce the details of this spectrum. We then provide, for n=3, detailed evidence by a variety of analytical and numerical techniques that the spectrum is not "random", but instead shows surprisingly subtle and regular patterns that moreover exhibit universality for generic deformation parameters. We also introduce a new model, the hypereclectic spin chain, where all parameters are zero except for one. Despite the extreme simplicity of its Hamiltonian, it still seems to reproduce the above "generic" spectra as a subset of an even more intricate overall spectrum. Our models are inspired by parts of the one-loop dilatation operator of a strongly twisted, double-scaled deformation of N=4 Super Yang-Mills Theory.
description: 32 pages, 5 figures, 4 tables
José Watanabe - Tre poesie
Creators: name: Antonella Cancellier, Irina Bajini
Publisher: name: La rivista di CRIAR
Year: 2019
Subjects: letteratura; traduzione

description: José Watanabe (1945-2007), poeta peruviano di origine giapponese, fu un apprezzato esponente della “Generación del 70”.
description: La rivista di CRIAR, N. 4 (2019)
"We hold these truths to be self-evident" : Kennedy, Nixon, and the issue of Cuban democracy in the American presidential campaign, 1960
Creators: name: McAndrew, Ian
Publisher: name: University of British Columbia
Year: 2009

description: This essay argues that John F. Kennedy and Richard Nixon demonstrated ambivalent feelings toward democracy as they participated in the American presidential campaign of 1960. Their oratory, on the one hand, suggested unqualified reverence for the Western democratic tradition. Both devoted considerable attention in their campaigns to establishing before voters their shared belief that America would eventually triumph over the communist enemy because of the strength and greatness that accrues to a society which recognizes freedom at home. In their campaign discussions of Cuba, Kennedy and Nixon argued that Fidel Castro would ultimately fall from power not because Americans opposed him, but rather because he was reviled and despised as an anti-democratic leader by Cubans. By implication Kennedy and Nixon were suggesting that democracy was not only an ideal ,they held dear, but one that was universal and intrinsic to the human essence. As they venerated democracy in these terms, however, Kennedy and Nixon showed by their behavior that they had a marked lack of reverence for the ideals and values underpinning the U.S. political system. Both candidates were ambitious and driven in their pursuit of the presidency, and both were willing to distort truth and contrive public images if these measures appeared expedient to their efforts to achieve victory. Clearly, Kennedy and Nixon must be held accountable for sanctioning and employing campaign tactics of this sort. The essay concludes, however, that scholars should also hold them accountable for their ambivalence, for failure to recognize their duplicity in portraying democracy in iconographic terms while simultaneously demonstrating that they held victory as more important than principles like honesty. Throughout, an important secondary theme of this study concerns the discourse Kennedy and Nixon used in discussing Cuba and Cubans, and the essay critiques in equal measure their scornful portrayal of Fidel Castro, and their paternalistic attitudes toward the Cuban nation.
Applications of the Backus-Gilbert method to linear and some non linear equations
Creators: name: Leitao, A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 65J20, 47A52

description: We investigate the use of a functional analytical version of the Backus-Gilbert Method as a reconstruction strategy to get specific information about the solution of linear and slightly non-linear systems with Frechét derivable operators. Some a priori error estimates are shown and tested for two classes of problems: a nonlinear moment problem and a linear elliptic Cauchy problem. For this second class of problems a special version of the Green-formula is developed in order to analyze the involved adjoint equations.
description: 15 pages, 6 figures
Quantitative and Interpretable Order Parameters for Phase Transitions from Persistent Homology
Creators: name: Cole, Alex
name: Loges, Gregory J.
name: Shiu, Gary
Publisher: name: arXiv
Year: 2020
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Algebraic Topology (math.AT)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We apply modern methods in computational topology to the task of discovering and characterizing phase transitions. As illustrations, we apply our method to four two-dimensional lattice spin models: the Ising, square ice, XY, and fully-frustrated XY models. In particular, we use persistent homology, which computes the births and deaths of individual topological features as a coarse-graining scale or sublevel threshold is increased, to summarize multiscale and high-point correlations in a spin configuration. We employ vector representations of this information called persistence images to formulate and perform the statistical task of distinguishing phases. For the models we consider, a simple logistic regression on these images is sufficient to identify the phase transition. Interpretable order parameters are then read from the weights of the regression. This method suffices to identify magnetization, frustration, and vortex-antivortex structure as relevant features for phase transitions in our models. We also define "persistence" critical exponents and study how they are related to those critical exponents usually considered.
description: 23 pages, 15 figures; code and data can be found at https://github.com/gloges/TDA-Spin-Models
Rotating non-asymptotically flat black rings in charged dilaton gravity
Creators: name: Yazadjiev, Stoytcho S.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We derive new rotating, non-asymptotically flat black ring solutions in five-dimensional Einstein-Maxwell-dilaton gravity with dilaton coupling constant $α=\sqrt{8/3}$ which arises from a six-dimensional Kaluza-Klein theory. As a limiting case we also find new rotating, non-asymptotically flat five-dimensional black holes. The solutions are analyzed and the mass, angular momentum and charge are computed. A Smarr-like relation is found. It is shown that the first law of black hole thermodynamics is satisfied.
description: 21 pages, LaTeX; v2 a reference added, typos corrected
Snapping elastic disks as microswimmers: swimming at low Reynolds numbers by shape hysteresis
Creators: name: Wischnewski, Christian
name: Kierfeld, Jan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We illustrate a concept for shape-changing microswimmers, which exploits the hysteresis of a shape transition of an elastic object, by an elastic disk undergoing cyclic localized swelling. Driving the control parameter of a hysteretic shape transition in a completely time-reversible manner gives rise to a non-time-reversible shape sequence and a net swimming motion if the elastic object is immersed into a viscous fluid. We prove this concept with a microswimmer which is a flat circular elastic disk that undergoes a transition into a dome-like shape by localized swelling of an inner disk. The control parameter of this shape transition is a scalar swelling factor of the disk material. With a fixed outer frame with an additional attractive interaction in the central region, the shape transition between flat and dome-like shape becomes hysteretic and resembles a hysteretic opening and closing of a scallop. Employing Stokesian dynamics simulations of a discretized version of the disk we show that the swimmer is effectively moving into the direction of the opening of the dome in a viscous fluid if the swelling parameter is changed in a time-reversible manner. The swimming mechanism can be qualitatively reproduced by a simple 9-bead model.
description: 16 pages, 14 figures
Context- and Sequence-Aware Convolutional Recurrent Encoder for Neural Machine Translation
Creators: name: Mallick, Ritam
name: Susan, Seba
name: Agrawal, Vaibhaw
name: Garg, Rizul
name: Rawal, Prateek
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: Neural Machine Translation model is a sequence-to-sequence converter based on neural networks. Existing models use recurrent neural networks to construct both the encoder and decoder modules. In alternative research, the recurrent networks were substituted by convolutional neural networks for capturing the syntactic structure in the input sentence and decreasing the processing time. We incorporate the goodness of both approaches by proposing a convolutional-recurrent encoder for capturing the context information as well as the sequential information from the source sentence. Word embedding and position embedding of the source sentence is performed prior to the convolutional encoding layer which is basically a n-gram feature extractor capturing phrase-level context information. The rectified output of the convolutional encoding layer is added to the original embedding vector, and the sum is normalized by layer normalization. The normalized output is given as a sequential input to the recurrent encoding layer that captures the temporal information in the sequence. For the decoder, we use the attention-based recurrent neural network. Translation task on the German-English dataset verifies the efficacy of the proposed approach from the higher BLEU scores achieved as compared to the state of the art.
description: Accepted in 36th ACM/SIGAPP Symposium On Applied Computing 2021
On the possibility of through passage of asteroid bodies across the Earth's atmosphere
Creators: name: Khrennikov, Daniil E.
name: Titov, Andrei K.
name: Ershov, Alexander E.
name: Pariev, Vladimir I.
name: Karpov, Sergei V.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: FOS: Physical sciences

description: We have studied the conditions of through passage of asteroids with diameters 200, 100 and 50 m, consisting of three types of materials -- iron, stone and water ice across the Earth's atmosphere with the minimum trajectory altitude 10--15 km. The conditions of this passage with subsequent exit into outer space with the preservation of a substantial fraction of the initial mass have been found. The results obtained support our idea explaining one of the long-standing problems of astronomy -- the Tunguska phenomenon which has not received reasonable and comprehensive interpretations to date. We argue that Tunguska event was caused by an iron asteroid body, which passed through the Earth's atmosphere and continued to the near-solar orbit.
description: 8 pages, 13 figures
Raw reads of the data published in the manuscript Variable fitness effects of bacteriophage resistance mutations in Escherichia coli: implications for phage therapy
Creators: name: GABORIEAU, Baptiste
name: Delattre, Raphaëlle
name: Adiba, Sandrine
name: Clermont, Olivier
name: Denamur, Erick
name: Ricard, Jean-Damien
name: Debarbieux, Laurent
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 310701
subject: Bacteriology
classificationCode: 310704
subject: Microbial genetics
classificationCode: 310706
subject: Virology

description: This study (doi: 10.1128/jvi.01113-24) isolated more than 50 phage-resistant mutants from both in vitro and in vivo conditions, exposing an extra-intestinal pathogenic Escherichia coli strain to a single virulent phage. The characterization of these clones revealed several key findings: (1) mutations occurring during phage treatment affect the same pathways as those identified in vitro; (2) the resistance mechanisms are associated with the modification of two cell-wall components, with one involving receptor deletion (phage-specific mechanism) and the other, less frequent, involving receptor masking (phage-nonspecific mechanism); (3) an in vivo virulence assay demonstrated that the absence of the receptor abolishes virulence while masking the receptor preserves it; and (4) clones with a resistance mechanism nonspecific to a particular phage can remain susceptible to other phages. This supports the idea of incorporating diverse phages into therapeutic cocktails designed to collectively target both wild-type and phage-resistant strains, including those with resistance mechanisms nonspecific to a phage.
High-accuracy waveforms for black hole-neutron star systems with spinning black holes
Creators: name: Foucart, Francois
name: Chernoglazov, Alexander
name: Boyle, Michael
name: Hinderer, Tanja
name: Miller, Max
name: Moxon, Jordan
name: Scheel, Mark A.
name: Deppe, Nils
name: Duez, Matthew D.
name: Hebert, Francois
name: Kidder, Lawrence E.
name: Throwe, William
name: Pfeiffer, Harald P.
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The availability of accurate numerical waveforms is an important requirement for the creation and calibration of reliable waveform models for gravitational wave astrophysics. For black hole-neutron star binaries, very few accurate waveforms are however publicly available. Most recent models are calibrated to a large number of older simulations with good parameter space coverage for low-spin non-precessing binaries but limited accuracy, and a much smaller number of longer, more recent simulations limited to non-spinning black holes. In this paper, we present long, accurate numerical waveforms for three new systems that include rapidly spinning black holes, and one precessing configuration. We study in detail the accuracy of the simulations, and in particular perform for the first time in the context of BHNS binaries a detailed comparison of waveform extrapolation methods to the results of Cauchy Characteristic Extraction. The new waveforms have $<0.1\,{\rm rad}$ phase errors during inspiral, rising to $\sim (0.2-0.4)\,{\rm rad}$ errors at merger, and $\lesssim 1\%$ error in their amplitude. We compute the faithfulness of recent analytical models to these numerical results, and find that models specifically designed for BHNS binaries perform well ($F>0.99$) for binaries seen face-on. For edge-on observations, particularly for precessing systems, disagreements between models and simulations increase, and models that include precession and/or higher-order modes start to perform better than BHNS models that currently lack these features.
description: 16p, 14 figs, 2 tables; To be submitted to PRD
Raw reads of E. coli 536 bacterial resistant clones to phage 536_P1
Creators: name: GABORIEAU, Baptiste
name: Delattre, Raphaëlle
name: Adiba, Sandrine
name: Clermont, Olivier
name: Denamur, Erick
name: Ricard, Jean-Damien
name: Debarbieux, Laurent
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 310701
subject: Bacteriology
classificationCode: 310704
subject: Microbial genetics
classificationCode: 310706
subject: Virology

description: This study (doi: 10.1128/jvi.01113-24) isolated more than 50 phage-resistant mutants from both in vitro and in vivo conditions, exposing an extra-intestinal pathogenic Escherichia coli strain to a single virulent phage. The characterization of these clones revealed several key findings: (1) mutations occurring during phage treatment affect the same pathways as those identified in vitro; (2) the resistance mechanisms are associated with the modification of two cell-wall components, with one involving receptor deletion (phage-specific mechanism) and the other, less frequent, involving receptor masking (phage-nonspecific mechanism); (3) an in vivo virulence assay demonstrated that the absence of the receptor abolishes virulence while masking the receptor preserves it; and (4) clones with a resistance mechanism nonspecific to a particular phage can remain susceptible to other phages. This supports the idea of incorporating diverse phages into therapeutic cocktails designed to collectively target both wild-type and phage-resistant strains, including those with resistance mechanisms nonspecific to a phage.
Grammatical elicitation: Possession
Creators: name: Sales, Henry
name: Garvin, Karee
name: Hermalin, Noah
name: Melguy, Yevgeniy
name: Michael, Lev
name: Scott, Tessa
name: Wilbanks, Eric
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2021
Subjects: subject: mam

description: Involves some number of people owning some number of dogs. Lead elicitor: Yevgeniy Melguy. Scribe: Eric Wilbanks. Clean copy: Noah Hermalin.
On the connection between Random Waves and Quantum Fields. Duality between nodal lines statistic and the Casimir energy
Creators: name: Scardicchio, A.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Using the statistical description common to random waves and quantum fields we show how the probability of having a nodal line close to a (translationally symmetric) reference curve $γ$ is related to the Casimir energy of an appropriate configuration of conductors.
description: 13 pages, no figures
Fuzzy Dark Matter and the 21cm Power Spectrum
Creators: name: Jones, Dana
name: Palatnick, Skyler
name: Chen, Richard
name: Beane, Angus
name: Lidz, Adam
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We model the 21cm power spectrum across the Cosmic Dawn and the Epoch of Reionization (EoR) in fuzzy dark matter (FDM) cosmologies. The suppression of small mass halos in FDM models leads to a delay in the onset redshift of these epochs relative to cold dark matter (CDM) scenarios. This strongly impacts the 21cm power spectrum and its redshift evolution. The 21cm power spectrum at a given stage of the EoR/Cosmic Dawn process is also modified: in general, the amplitude of 21cm fluctuations is boosted by the enhanced bias factor of galaxy hosting halos in FDM. We forecast the prospects for discriminating between CDM and FDM with upcoming power spectrum measurements from HERA, accounting for degeneracies between astrophysical parameters and dark matter properties. If FDM constitutes the entirety of the dark matter and the FDM particle mass is 10-21eV, HERA can determine the mass to within 20 percent at 2-sigma confidence.
description: 15 pages, 12 figures, Accepted for publication to ApJ
The Dynamics of Entanglement in the Adiabatic Search and Deutsch Algorithms
Creators: name: Choy, K.
name: Passante, G.
name: Ahrensmeier, D.
name: Carrington, M. E.
name: Fugleberg, T.
name: Kobes, R.
name: Kunstatter, G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The goal of this paper is to study the effect of entanglement on the running time of a quantum computation. Adiabatic quantum computation is suited to this kind of study, since it allows us to explicitly calculate the time evolution of the entanglement throughout the calculation. On the other hand however, the adiabatic formalism makes it impossible to study the roles of entanglement and fidelity separately, which means that results have to be interpreted carefully. We study two algorithms: the search algorithm and the Deutsch-Jozsa algorithm. We find some evidence that entanglement can be considered a resource in quantum computation.
description: 29 pages, 25 figures
On Mott's formula for the ac-conductivity in the Anderson model
Creators: name: Klein, Abel
name: Lenoble, Olivier
name: Müller, Peter
Publisher: name: arXiv
Year: 2005
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 82B44 (Primary) 47B80, 60H25 (Secondary)

description: We study the ac-conductivity in linear response theory in the general framework of ergodic magnetic Schrödinger operators. For the Anderson model, if the Fermi energy lies in the localization regime, we prove that the ac-conductivity is bounded by $C ν^2 (\log \frac 1 ν)^{d+2}$ at small frequencies $ν$. This is to be compared to Mott's formula, which predicts the leading term to be $C ν^2 (\log \frac 1 ν)^{d+1}$.
description: 29 pages, 1 figure; misprints corrected, references updated, Remark 3.2 on gauge equivalence added; to appear in the Annals of Mathematics
ELSA: An Integrated, Semi-Automated Nebular Abundance Package
Creators: name: Johnson, M. D.
name: Levitt, J. S.
name: Henry, R. B. C.
name: Kwitter, K. B.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present ELSA, a new modular software package, written in C, to analyze and manage spectroscopic data from emission-line objects. In addition to calculating plasma diagnostics and abundances from nebular emission lines, the software provides a number of convenient features including the ability to ingest logs produced by IRAF's splot task, to semi-automatically merge spectra in different wavelength ranges, and to automatically generate various data tables in machine-readable or LaTeX format. ELSA features a highly sophisticated interstellar reddening correction scheme that takes into account temperature and density effects as well as He II contamination of the hydrogen Balmer lines. Abundance calculations are performed using a 5-level atom approximation with recent atomic data, based on R. Henry's ABUN program. Improvements planned in the near future include use of a three-region ionization model, similar to IRAF's nebular package, error propagation, and the addition of ultraviolet and infrared line analysis capability. Detailed documentation for all aspects of ELSA are available at http://www.williams.edu/Astronomy/research/PN .
description: 2 pages, contributed paper, IAU Symp. 234, Planetary Nebulae in Our Galaxy and Beyond
Orbital structure of the effective pairing interaction in the high-temperature superconducting cuprates
Creators: name: Mai, Peizhi
name: Balduzzi, Giovanni
name: Johnston, Steven
name: Maier, Thomas A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The nature of the effective interaction responsible for pairing in the high-temperature superconducting cuprates remains unsettled. This question has been studied extensively using the simplified single-band Hubbard model, which does not explicitly consider the orbital degrees of freedom of the relevant CuO$_2$ planes. Here, we use a dynamic cluster quantum Monte Carlo approximation to study the orbital structure of the pairing interaction in the three-band Hubbard model, which treats the orbital degrees of freedom explicitly. We find that the interaction predominately acts between neighboring copper orbitals, but with significant additional weight appearing on the surrounding bonding molecular oxygen orbitals. By explicitly comparing these results to those from the simpler single-band Hubbard model, our study provides strong support for the single-band framework for describing superconductivity in the cuprates.
title: Dagstuhl Reports, Table of Contents, Volume 6, Issue 3, 2016
Creators: name: Schloss Dagstuhl – Leibniz-Zentrum für Informatik
Publisher: name: Schloss Dagstuhl – Leibniz-Zentrum für Informatik
Year: 2016
Subjects: subject: Dagstuhl Reports
subject: Table of Contents
subject: Volume 6
subject: Issue 3
subject: 2016

description: Table of Contents, Frontmatter
description: Dagstuhl Reports, Volume 6, Issue 3, pages i-ii
"Gemeinsame Kommission für den theologischen Dialog zwischen der Orthodoxen Kirche und den Orientalischen Orthodoxen Kirchen"
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 43 Nr. 1 (1994): Ökumenische Rundschau, Band 43, Heft 1
Rigid supersymmetry with boundaries
Creators: name: Belyaev, Dmitry V.
name: van Nieuwenhuizen, Peter
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We construct rigidly supersymmetric bulk-plus-boundary actions, both in $x$-space and in superspace. For each standard supersymmetric bulk action a minimal supersymmetric bulk-plus-boundary action follows from an extended $F$- or $D$-term formula. Additional separately supersymmetric boundary actions can be systematically constructed using co-dimension one multiplets (boundary superfields). We also discuss the orbit of boundary conditions which follow from the Euler-Lagrange variational principle.
description: 28 pages, JHEP class
Hierarchical Bin Buffering: Online Local Moments for Dynamic External Memory Arrays
Creators: name: Lemire, Daniel
name: Kaser, Owen
Publisher: name: arXiv
Year: 2006
Subjects: subject: Data Structures and Algorithms (cs.DS)
subject: Databases (cs.DB)
subject: FOS: Computer and information sciences
subject: H.3.5; G.1.1

description: Local moments are used for local regression, to compute statistical measures such as sums, averages, and standard deviations, and to approximate probability distributions. We consider the case where the data source is a very large I/O array of size n and we want to compute the first N local moments, for some constant N. Without precomputation, this requires O(n) time. We develop a sequence of algorithms of increasing sophistication that use precomputation and additional buffer space to speed up queries. The simpler algorithms partition the I/O array into consecutive ranges called bins, and they are applicable not only to local-moment queries, but also to algebraic queries (MAX, AVERAGE, SUM, etc.). With N buffers of size sqrt{n}, time complexity drops to O(sqrt n). A more sophisticated approach uses hierarchical buffering and has a logarithmic time complexity (O(b log_b n)), when using N hierarchical buffers of size n/b. Using Overlapped Bin Buffering, we show that only a single buffer is needed, as with wavelet-based algorithms, but using much less storage. Applications exist in multidimensional and statistical databases over massive data sets, interactive image processing, and visualization.
Isolated galaxies: residual of primordial building blocks?
Creators: name: Galletta, G.
name: Rodighiero, G.
name: Bettoni, D.
name: Moles, M.
name: Varela, J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: CONTEXT.The mass assembly is believed to be the dominant process of early galaxy formation. This mechanism of galaxy building can proceed either by repeated major mergers with other systems, or by means of accretion of matter from the surrounding regions. AIMS.In this paper we compare the properties of local disk galaxies that appear isolated, i.e. not tidally affected by other galaxies during the last few Gyr within the volume given by cz<= 5000 km/s, with those galaxies at z values from 0.25 to 5. METHODS.Effective radii for 203 isolated galaxies and 1645 galaxies from the RC3 have been collected and the two samples have been analyzed statistically. A similar comparison has been made with half light radii studied at high z from the literature. RESULTS.We found that isolated galaxies are in general smaller than other present epoch galaxies from the RC3. We notice the lack of systems larger than 7 kpc among them. Their size distribution appears to be similar to that of galaxies at 1.4 <= z <= 2. The models of the merging history also indicate that the isolated galaxies did stop their merging process at about that redshift, evolving passively since then. The galaxy density seems to have remained unchanged since that epoch. CONCLUSIONS.Isolated galaxies appears to be the end products of the merging process as proposed in the hierarchical accretion scenario at around z=1.4. For this class of galaxies this was the last significant merging event in their lives and have evolved passively since then. This is confirmed by the analytical estimate of the merging fraction with z and by the comparison with sizes of distant galaxies.
description: 6 pages, 3 figures. Accepted for publication in A&A. A&A style file added to the source
title: Dagstuhl Reports, Table of Contents, Volume 6, Issue 4, 2016
Creators: name: Schloss Dagstuhl – Leibniz-Zentrum für Informatik
Publisher: name: Schloss Dagstuhl – Leibniz-Zentrum für Informatik
Year: 2016
Subjects: subject: Dagstuhl Reports
subject: Table of Contents
subject: Volume 6
subject: Issue 4
subject: 2016

description: Table of Contents, Frontmatter
description: Dagstuhl Reports, Volume 6, Issue 4, pages i-ii
Resolving the outer ring of HD 38206 using ALMA and constraining limits on planets in the system
Creators: name: Booth, Mark
name: Schulz, Michael
name: Krivov, Alexander V.
name: Marino, Sebastián
name: Pearce, Tim D.
name: Launhardt, Ralf
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: HD 38206 is an A0V star in the Columba association, hosting a debris disc first discovered by IRAS. Further observations by Spitzer and Herschel showed that the disc has two components, likely analogous to the asteroid and Kuiper belts of the Solar System. The young age of this star makes it a prime target for direct imaging planet searches. Possible planets in the system can be constrained using the debris disc. Here we present the first ALMA observations of the system's Kuiper belt and fit them using a forward modelling MCMC approach. We detect an extended disc of dust peaking at around 180 au with a width of 140 au. The disc is close to edge on and shows tentative signs of an asymmetry best fit by an eccentricity of $0.25^{+0.10}_{-0.09}$. We use the fitted parameters to determine limits on the masses of planets interior to the cold belt. We determine that a minimum of four planets are required, each with a minimum mass of 0.64 M$_J$, in order to clear the gap between the asteroid and Kuiper belts of the system. If we make the assumption that the outermost planet is responsible for the stirring of the disc, the location of its inner edge and the eccentricity of the disc, then we can more tightly predict its eccentricity, mass and semimajor axis to be $e_{\rm{p}}=0.34^{+0.20}_{-0.13}$, $m_{\rm{p}}=0.7^{+0.5}_{-0.3}\,\rm{M}_{\rm{J}}$ and $a_{\rm{p}}=76^{+12}_{-13}\,\rm{au}$.
description: 9 pages, 5 figures, accepted for publication in MNRAS
The generalized parton distributions of the nucleon in the NJL model based on the Faddeev approach
Creators: name: Mineo, H.
name: Yang, Shin Nan
name: Cheung, Chi-Yee
name: Bentz, W.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the generalized parton distributions, including the helicity-flip ones, using Nambu-Jona-Lasinio model based on a relativistic Faddeev approach with `static approximation'. Sum rules relating the generalized parton distributions to nucleon electromagnetic form factors are satisfied. Moreover, quark-antiquark contributions in the region $-ξ
description: 35 pages, 15 figures
ATLASGAL-selected massive clumps in the inner Galaxy: VIII. Chemistry of photodissociation regions
Creators: name: Kim, W. -J.
name: Wyrowski, F.
name: Urquhart, J. S.
name: Pérez-Beaupuits, J. P.
name: Pillai, T.
name: Tiwari, M.
name: Menten, K. M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We study ten molecular transitions obtained from an unbiased 3 mm molecular line survey using the IRAM 30 m telescope toward 409 compact dust clumps identified by the APEX Telescope Large Area Survey of the Galaxy (ATLASGAL) to understand photodissociation regions (PDRs) associated with the clumps. The main goal of this study is to investigate whether the abundances of the selected molecules show any variations resulting from the PDR chemistry in different clump environments. We selected HCO, HOC$^+$, C$_{2}$H, c-C$_{3}$H$_{2}$, CN, H$^{13}$CN, HC$^{15}$N, and HN$^{13}$C as PDR tracers, and H$^{13}$CO$^{+}$ and C$^{18}$O as dense gas tracers. We find that the abundances of HCO, CN, C$_{2}$H and c-C$_{3}$H$_{2}$ decrease as the H$_{2}$ column density increase, indicating high visual extinction, while those of high density tracers (i.e., H$^{13}$CO$^{+}$ and HC$^{15}$N) are constant. In addition, $N$(HCO)/$N$(H$^{13}$CO$^{+}$) ratios significantly decrease as H$_{2}$ column density increase, and in particular, 82 clumps have $X$(HCO) $\gtrsim 10^{-10}$ and $N$(HCO)/$N$(H$^{13}$CO$^{+}$) $\gtrsim 1$, which are the indication of far-ultraviolet (FUV) chemistry. This suggests the observed HCO abundances are likely associated with FUV radiation illuminating the PDRs. We also find that high $N$(c-C$_{3}$H$_{2}$)/$N$(C$_{2}$H) ratios found for HII regions having high HCO abundances ($\gtrsim\,10^{-10}$) are associated with more evolved clumps with high $L_{\rm bol}$/$M_{\rm clump}$. This trend might be associated with gain-surface processes, which determine initial abundances of these molecules, and time-dependent effects in the clumps corresponding to the envelopes around dense PDRs and HII regions. In addition, some fraction of the measured abundances of the small hydrocarbons of the HII sources can be the result of the photodissociation of PAH molecules.
description: 19 pages, 16 figures, 7 tables. Accepted for publication for A&A
The role of [beta]1 integrins in dorsal aorta vasculogenesis in the chicken embryo
Creators: name: Vair, Corey Francis
Publisher: name: University of British Columbia
Year: 2009

description: Vasculogenesis is the de novo formation of blood vessels from endothelial cell precursors known as angioblasts. In the chicken embryo, the dorsal aorta is formed by this process. Adhesion molecules such as integrins and their extracellular matrix ligands are believed to mediate vasculogenesis. Immunohistochemistry was used to determine the temporal and spatial distribution of the α5, α6 and β1 integrin subunits, the extracellular matrix proteins, fibronectin and laminin, and the endothelial cell marker, thrombomucin, in the chicken embryo from stages 8 through 14. The β1, integrin subunit and fibronectin were shown to be localized to the site of dorsal aorta vasculogenesis prior to lumen formation. The α5 integrin subunit and laminin were shown to be localized to the site of dorsal aorta vasculogenesis after lumen formation had commenced. The α6 subunit was not detected on cells of the dorsal aorta at the stages examined but was detected in control tissues. In order to investigate the role of β1 integrins in dorsal aorta vasculogenesis, integrin blocking antibodies and peptides containing integrin recognition sequences were injected at the site of dorsal aorta vasculogenesis in ovo to disrupt receptor-ligand interactions. The β1 integrin blocking antibodies, CSAT and W1B10, prevented dorsal aorta lumen formation and induced lateral displacement of somites while non-specific antibodies had no effect. None of the α5β1, α2β1, or α6β1 blocking peptides (RGD, DGEA, and YIGSR, respectively) or the control peptide, RGES, induced dorsal aorta malformations. The dorsal aorta malformations induced by blocking the β1 integrin subunit were proposed to be mediated by integrins other than α5β1, and α6β1 due to the absence of the α5 and α6 subunits during lumen formation. For the same reason, the ligands of the β1 integrins involved in dorsal aorta vasculogenesis would not include laminin; however, fibronectin remained as a possible ligand. Conversely, the localization of the β1 subunit along cell-cell contacts of angioblasts suggests that the ligand may be a cell membrane-bound molecule rather than an ECM component.
Random growth models with polygonal shapes
Creators: name: Gravner, Janko
name: Griffeath, David
Publisher: name: arXiv
Year: 2005
Subjects: subject: Probability (math.PR)
subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 60K35 (Primary) 11N25 (Secondary)

description: We consider discrete-time random perturbations of monotone cellular automata (CA) in two dimensions. Under general conditions, we prove the existence of half-space velocities, and then establish the validity of the Wulff construction for asymptotic shapes arising from finite initial seeds. Such a shape converges to the polygonal invariant shape of the corresponding deterministic model as the perturbation decreases. In many cases, exact stability is observed. That is, for small perturbations, the shapes of the deterministic and random processes agree exactly. We give a complete characterization of such cases, and show that they are prevalent among threshold growth CA with box neighborhood. We also design a nontrivial family of CA in which the shape is exactly computable for all values of its probability parameter.
description: Published at http://dx.doi.org/10.1214/009117905000000512 in the Annals of Probability (http://www.imstat.org/aop/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Planar binary trees in scattering amplitudes
Creators: name: Mafra, Carlos R.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Combinatorics (math.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: These notes are a written version of my talk given at the CARMA workshop in June 2017, with some additional material. I presented a few concepts that have recently been used in the computation of tree-level scattering amplitudes (mostly using pure spinor methods but not restricted to it) in a context that could be of interest to the combinatorics community. In particular, I focused on the appearance of {\it planar binary trees} in scattering amplitudes and presented some curious identities obeyed by related objects, some of which are known to be true only via explicit examples.
description: 19 pp, submission to CARMA proceedings from 2017
title: Dagstuhl Reports, Table of Contents, Volume 6, Issue 5, 2016
Creators: name: Schloss Dagstuhl – Leibniz-Zentrum für Informatik
Publisher: name: Schloss Dagstuhl – Leibniz-Zentrum für Informatik
Year: 2016
Subjects: subject: Dagstuhl Reports
subject: Table of Contents
subject: Volume 6
subject: Issue 5
subject: 2016

description: Table of Contents, Frontmatter
description: Dagstuhl Reports, Volume 6, Issue 5, pages i-ii
Cassini UVIS Observations of the Io Plasma Torus. III. Observations of Temporal and Azimuthal Variability
Creators: name: Steffl, A. J.
name: Delamere, P. A.
name: Bagenal, F.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In this third paper in a series presenting observations by the Cassini Ultraviolet Imaging Spectrometer (UVIS) of the Io plasma torus, we show remarkable, though subtle, spatio-temporal variations in torus properties. The Io torus is found to exhibit significant, near-sinusoidal variations in ion composition as a function of azimuthal position. The azimuthal variation in composition is such that the mixing ratio of S II is strongly correlated with the mixing ratio of S III and the equatorial electron density and strongly anti-correlated with the mixing ratios of both S IV and O II and the equatorial electron temperature. Surprisingly, the azimuthal variation in ion composition is observed to have a period of 10.07 hours--1.5% longer than the System III rotation period of Jupiter, yet 1.3% shorter than the System IV period defined by Brown (1995). Although the amplitude of the azimuthal variation of S III and O II remained in the range of 2-5%, the amplitude of the S II and S IV compositional variation ranged between 5-25% during the UVIS observations. Furthermore, the amplitude of the azimuthal variations of S II and S IV appears to be modulated by its location in System III longitude, such that when the region of maximum S II mixing ratio (minimum S IV mixing ratio) is aligned with a System III longitude of ~200 +/- 15 degrees, the amplitude is a factor of ~4 greater than when the variation is anti-aligned. This behavior can explain numerous, often apparently contradictory, observations of variations in the properties of the Io plasma torus with the System III and System IV coordinate systems.
description: 35 pages including 12 figures and 2 tables
Evaluation of the WEPP hillslope profile model for estimating runoff and soil loss for two sites in western Canada
Creators: name: Mansoor, Kayyum
Publisher: name: University of British Columbia
Year: 2009

description: The Water Erosion Prediction Project (WEPP) is a process based erosion prediction model based on the fundamentals of soil physics, hydrology and biomass prediction designed to replace empirically based soil loss estimators for use with action agencies involved with soil and water conservation and environmental planning and assessment. To better assess and predict soil erosion, the WEPP Hillslope Soil Erosion model (version 95.7) was evaluated with measured runoff and soil loss data from two representative agricultural erosion monitoring sites located in distinctive climatic regions in Western Canada. The required climate, soil, slope and management data was carefully compiled to represent actual conditions. A sensitivity analysis was performed to assess model response to changes in parameters, and calibrations were performed to improve model efficiency. Original and calibrated model results were compared to annual and event based observations of runoff and soil loss. The WEPP model responded to changes in land use practices and it efficiently predicted annual runoff for a site with a temperate climate and soil loss for a fallow plot in a colder climate when adjustments to the soil detachment parameters were incorporated. Otherwise, the model did not comply with measured runoff and soil loss due to errors in estimation associated with weaknesses in the winter hydrology component, plant-growth and residue decomposition parameters, and the erosion component. If enhancements in the model components and a more comprehensive built-in database can improve soil loss predictions, the WEPP model can potentially be used as a powerful new tool for applications related to forestry, mine-reclamation, construction sites and rangelands in addition to agricultural situations to assess the impacts of on and off-site soil erosion and sedimentation.
Gravitational Radiation from Newborn Magnetars
Creators: name: Stella, Luigi
name: Dall'Osso, Simone
name: Israel, GianLuca
name: Vecchio, Alberto
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: There is growing evidence that two classes of high-energy sources, the Soft Gamma Repeaters and the Anomalous X-ray Pulsars contain slowly spinning ``magnetars'', i.e. neutron stars whose emission is powered by the release of energy from their extremely strong magnetic fields (>10^15 G. We show here that the enormous energy liberated in the 2004 December 27 giant flare from SGR1806-20 (~5 10^46 erg), together with the likely recurrence time of such events, requires an internal field strength of > 10^16 G. Toroidal magnetic fields of this strength are within an order of magnitude of the maximum fields that can be generated in the core of differentially-rotating neutron stars immediately after their formation, if their initial spin period is of a few milliseconds. A substantial deformation of the neutron star is induced by these magnetic fields and, provided the deformation axis is offset from the spin axis, a newborn fast-spinning magnetar would radiate for a few weeks a strong gravitational wave signal the frequency of which (0.5-2 kHz range) decreases in time. The signal from a newborn magnetar with internal field > 10^16.5 G could be detected with Advanced LIGO-class detectors up to the distance of the Virgo cluster (characteristic amplitude h_c about 10^-21). Magnetars are expected to form in Virgo at a rate approx. 1/yr. If a fraction of these have sufficiently high internal magnetic field, then newborn magnetars constitute a promising new class of gravitational wave emitters.
description: Accepted for publication on ApJ Letters
Giocarsi l’identità: sport e culture, il locale e il globale
Creators: name: Paolo Caponi, (A Cura Di)
name: Nicoletta Vallorani, (A Cura Di)
Publisher: name: Università degli  Studi di Milano
Year: 2015

description: Giocarsi l’identità: sport e culture, il locale e il globale

EDITORIALE
Giocarsi l’identità: sport e culture, il locale e il globale
description: Altre Modernità, No 14 (2015): Giocarsi l’identità: sport  e culture, il locale e il globale
Nuclear dependence of light neutral meson production in p-A collisions at 400 GeV with NA60
Creators: name: Arnaldi, R.
name: Banicz, K.
name: Borer, K.
name: Castor, J.
name: Chaurand, B.
name: Chen, W.
name: Cicalò, C.
name: Colla, A.
name: Cortese, P.
name: Damjanovic, S.
name: David, A.
name: De Falco, A.
name: Devaux, A.
name: Ducroux, L.
name: En'yo, H.
name: Fargeix, J.
name: Ferretti, A.
name: Floris, M.
name: Förster, A.
name: Force, P.
name: Guettet, N.
name: Guichard, A.
name: Gulkanian, H.
name: Heuser, J. M.
name: Jarron, P.
name: Keil, M.
name: Kluberg, L.
name: Li, Z.
name: Lourenço, C.
name: Lozano, J.
name: Manso, F.
name: Martins, P.
name: Masoni, A.
name: Neves, A.
name: Ohnishi, H.
name: Oppedisano, C.
name: Parracho, P.
name: Pillot, P.
name: Poghosyan, T.
name: Puddu, G.
name: Radermacher, E.
name: Ramalhete, P.
name: Rosinsky, P.
name: Scomparin, E.
name: Seixas, J.
name: Serci, S.
name: Shahoyan, R.
name: Sonderegger, P.
name: Specht, H. J.
name: Tieulent, R.
name: Uras, A.
name: Usai, G.
name: Veenhof, R.
name: Wöhri, H. K.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The NA60 experiment has studied low-mass muon pair production in proton-nucleus collisions with a system of Be, Cu, In, W, Pb and U targets, using a 400 GeV proton beam at the CERN SPS. The transverse momentum spectra of the $ρ/ω$ and $ϕ$ mesons are measured in the full $p_\mathrm{T}$ range accessible, from $p_\mathrm{T} = 0$ up to 2 GeV/$c$. The nuclear dependence of the production cross sections of the $η$, $ω$ and $ϕ$ mesons has been found to be consistent with the power law $σ_\mathrm{pA} \propto \mathrm{A}^α$, with the $α$ parameter increasing as a function of $p_\mathrm{T}$ for all the particles, and an approximate hierarchy $α_η\approx α_ϕ> α_ω$. The cross section ratios $σ_η/σ_ω$, $σ_ρ/σ_ω$ and $σ_ϕ/σ_ω$ have been studied as a function of the size A of the production target, and an increase of the $η$ and $ϕ$ yields relative to the $ω$ is observed from p-Be to p-U collisions.