cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Measuring the primordial gravitational wave background in the presence of other stochastic signals
Creators: name: Poletti, Davide
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Standard methodologies for the extraction of the stochastic gravitational wave background (SGWB) from auto- or cross-correlation of interferometric signals often involve the use of a filter function. The standard optimal filter maximizes the signal-to-noise ratio (SNR) between the total SGWB and the noise. We derive expressions for the optimal filter and SNR in the presence of a target SGWB plus other unwanted components. We also generalize the methodology to the case of template-free reconstruction. The formalism allows to easily perform analyses and forecasts that marginalize over foreground signals, such as the typical $Ω_{\rm GW} \propto f^{2/3}$ background arising from binary coalescence. We demonstrate the methodology with the LISA mission and discuss possible extensions and domains of application.
description: 23 pages, 8 figures. Accepted on JCAP
General-purpose kernel regularization of boundary integral equations via density interpolation
Creators: name: Faria, Luiz M.
name: Pérez-Arancibia, Carlos
name: Bonnet, Marc
Publisher: name: arXiv
Year: 2020
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: This paper presents a general high-order kernel regularization technique applicable to all four integral operators of Calderón calculus associated with linear elliptic PDEs in two and three spatial dimensions. Like previous density interpolation methods, the proposed technique relies on interpolating the density function around the kernel singularity in terms of solutions of the underlying homogeneous PDE, so as to recast singular and nearly singular integrals in terms of bounded (or more regular) integrands. We present here a simple interpolation strategy which, unlike previous approaches, does not entail explicit computation of high-order derivatives of the density function along the surface. Furthermore, the proposed approach is kernel- and dimension-independent in the sense that the sought density interpolant is constructed as a linear combination of point-source fields, given by the same Green's function used in the integral equation formulation, thus making the procedure applicable, in principle, to any PDE with known Green's function. For the sake of definiteness, we focus here on Nyström methods for the (scalar) Laplace and Helmholtz equations and the (vector) elastostatic and time-harmonic elastodynamic equations. The method's accuracy, flexibility, efficiency, and compatibility with fast solvers are demonstrated by means of a variety of large-scale three-dimensional numerical examples.
The phonon Boltzmann equation, properties and link to weakly anharmonic lattice dynamics
Creators: name: Spohn, Herbert
Publisher: name: arXiv
Year: 2005
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: For low density gases the validity of the Boltzmann transport equation is well established. The central object is the one-particle distribution function, $f$, which in the Boltzmann-Grad limit satisfies the Boltzmann equation. Grad and, much refined, Cercignani argue for the existence of this limit on the basis of the BBGKY hierarchy for hard spheres. At least for a short kinetic time span, the argument can be made mathematically precise following the seminal work of Lanford. In this article a corresponding programme is undertaken for weakly nonlinear, both discrete and continuum, wave equations. Our working example is the harmonic lattice with a weakly nonquadratic on-site potential. We argue that the role of the Boltzmann $f$-function is taken over by the Wigner function, which is a very convenient device to filter the slow degrees of freedom. The Wigner function, so to speak, labels locally the covariances of dynamically almost stationary measures. One route to the phonon Boltzmann equation is a Gaussian decoupling, which is based on the fact that the purely harmonic dynamics has very good mixing properties. As a further approach the expansion in terms of Feynman diagrams is outlined. Both methods are extended to the quantized version of the weakly nonlinear wave equation. The resulting phonon Boltzmann equation has been hardly studied on a rigorous level. As one novel contribution we establish that the spatially homogeneous stationary solutions are precisely the thermal Wigner functions. For three phonon processes such a result requires extra conditions on the dispersion law. We also outline the reasoning leading to Fourier's law for heat conduction.
description: special issue on "Kinetic Theory", Journal of Statistical Physics, improved version
Novel cloning machine with supplementary information
Creators: name: Qiu, Daowen
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Probabilistic cloning was first proposed by Duan and Guo. Then Pati established a novel cloning machine (NCM) for copying superposition of multiple clones simultaneously. In this paper, we deal with the novel cloning machine with supplementary information (NCMSI). For the case of cloning two states, we demonstrate that the optimal efficiency of the NCMSI in which the original party and the supplementary party can perform quantum communication equals that achieved by a two-step cloning protocol wherein classical communication is only allowed between the original and the supplementary parties. From this equivalence it follows that NCMSI may increase the success probabilities for copying. Also, an upper bound on the unambiguous discrimination of two nonorthogonal pure product states is derived. Our investigation generalizes and completes the results in the literature.
description: 22 pages; the presentation is revised, and some typos are corrected
Sistema e riflessività: il paradosso di Russell o di Bradley?
Creators: name: Furlani, Simone
Publisher: name: Università degli Studi di Milano
Year: 2015

description: In this article, the Author analyses the Bradleian concept of contradiction and the thesis herewith proposed consists in thinking that the so-called «Russell’s antinomy», one of the most popular and most discussed theoretical points in the modern and contemporary philosophy, is rooted or better is implied in Bradley’s system. The Author argues that, formulating and presenting it at Frege, Russell articulated a question opening a consequent philosophic perspective already conceptually implied by Bradley’s theory of relations.
description: Itinera, No 10 (2015): Sistema e libertà. Razionalità e improvvisazione tra filosofia, arte e pratiche umane.
La situatività improvvisativa
Creators: name: De Leo, Daniela
Publisher: name: Università degli Studi di Milano
Year: 2015

description: Some manuscripts of Maurice Merleau-Ponty are the core of the investigation about the improvisation pursued in this essay, an investigation within the domain of the philosophical interrogation about music.  Merleau-Ponty’s manuscripts are brought into contact with Marcel Proust’s lectures with the aim of going over the construction of the “concept of improvisation” and of reflecting on the following questions: in the experience of improvisation, is just as necessary to recognize the emotional profile as the cognitive profile? What place does the improvisation occupy in musical experience?
description: Itinera, No 10 (2015): Sistema e libertà. Razionalità e improvvisazione tra filosofia, arte e pratiche umane.
Text: Story of the Mud Woman
Creators: name: Umenda Shigirango, Rosalina
name: Dabkowski, Maksymilian
name: Aguinda, Shen
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2021
Subjects: subject: con

description: A young man went hunting. He met a beautiful woman and decided to marry her. At the end, the woman wanted to go fishing. They were in a canoe and it was about to rain. She told her husband to cut some leaves but he went away and didn't return soon. He got back to discover his wife had melted to clay.
Theory-guided hard constraint projection (HCP): a knowledge-based data-driven scientific machine learning method
Creators: name: Chen, Yuntian
name: Huang, Dou
name: Zhang, Dongxiao
name: Zeng, Junsheng
name: Wang, Nanzhe
name: Zhang, Haoran
name: Yan, Jinyue
Publisher: name: arXiv
Year: 2020
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Machine learning models have been successfully used in many scientific and engineering fields. However, it remains difficult for a model to simultaneously utilize domain knowledge and experimental observation data. The application of knowledge-based symbolic AI represented by an expert system is limited by the expressive ability of the model, and data-driven connectionism AI represented by neural networks is prone to produce predictions that violate physical mechanisms. In order to fully integrate domain knowledge with observations, and make full use of the prior information and the strong fitting ability of neural networks, this study proposes theory-guided hard constraint projection (HCP). This model converts physical constraints, such as governing equations, into a form that is easy to handle through discretization, and then implements hard constraint optimization through projection. Based on rigorous mathematical proofs, theory-guided HCP can ensure that model predictions strictly conform to physical mechanisms in the constraint patch. The performance of the theory-guided HCP is verified by experiments based on the heterogeneous subsurface flow problem. Due to the application of hard constraints, compared with fully connected neural networks and soft constraint models, such as theory-guided neural networks and physics-informed neural networks, theory-guided HCP requires fewer data, and achieves higher prediction accuracy and stronger robustness to noisy observations.
description: 31 pages, 20 figures, 1 table
Analysis of electromagnetic and electromechanical power system transients with dynamic phasors
Creators: name: Henschel, Sebastian
Publisher: name: University of British Columbia
Year: 2009

description: Over the last 50 years, digital simulation of electric power systems has become an integral part for planning, design and operation in the power industry. The number of possibilities with respect to the purpose of a study, investigated frequency ranges, etc. with, in the past, limited computer resources has resulted in a spectrum of simulation tools, designed to handle very specific tasks. Simplifying assumptions were often needed to facilitate such a simulation. Recent system failures and power outages, partly due to increasingly sensitive operating conditions, have created a demand for more comprehensive studies and more general simulation tools that overcome former limitations. With regards to time-domain simulation, this demand has led to combining the areas of transient, mid-term and long-term stability. Confronted with concerns about black start and system restoration due to a global trend to a deregulated power market, several power utilities suggested to also include the area of electromagnetic transients. However, previously made assumptions as well as technical limitations complicate the implementation of this idea: Stability programs are based on the assumption that power transfer takes place at system frequency and are therefore unable to represent rapid electromagnetic transients. Electromagnetic transients programs, on the other hand, are very accurate but use too small simulation step sizes for an efficient simulation of electromechanical transients. A new method for simulating both types of transient phenomena with complex signals and dynamic phasors is presented in this thesis. Whereas in previous work three-phase transformations had been used to accomplish this task, this new method is applied directly in the phase-domain and not restricted to balanced three-phase systems. Several numerical aspects such as an appropriate variable representation, integration method and a control mechanism for variable simulation step sizes have been addressed. Important modeling constraints for transmission lines and synchronous machines have been thoroughly analysed and are considered in this work. Finally, several simulation examples are presented that compare the results of the new simulation program with the results obtained from the EMTP. These case studies demonstrate that the methods presented in this thesis are suited to combine the areas of electromagnetic and electromechanical transients simulation.
A Review of Tev Scale Lepton-Hadron and Photon-Hadron Colliders
Creators: name: Sultansoy, S.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: The investigation of lepton-hadron and photon-hadron collisions at TeV scale is crucial both to clarify the strong interaction dynamics from nuclei to quark-parton level and for adequate interpretation of experimental data from future hadron colliders (LHC and VLHC). In this presentation different TeV scale lepton-hadron and photon-hadron collider proposals (such as THERA, LEP-LHC, QCD Explorer etc) are discussed. The advantages of linac-ring type colliders has been shown comparatively.
description: Presented at PAC05, 16-20 May 2005, Knoxville, TN, USA
Thermodynamic signatures of the polaron-molecule transition in a Fermi gas
Creators: name: Parish, Meera M.
name: Adlong, Haydn S.
name: Liu, Weizhe E.
name: Levinsen, Jesper
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We consider the highly spin-imbalanced limit of a two-component Fermi gas, where there is a small density of $\downarrow$ impurities attractively interacting with a sea of $\uparrow$ fermions. In the single-impurity limit at zero temperature, there exists the so-called polaron-molecule transition, where the impurity sharply changes its character by binding a $\uparrow$ fermion at sufficiently strong attraction. Using a recently developed variational approach, we calculate the thermodynamic properties of the impurity, and we show that the transition becomes a smooth crossover at finite temperature due to the thermal occupation of excited states in the impurity spectral function. However, remnants of the single-impurity transition are apparent in the momentum-resolved spectral function, which can in principle be probed with Raman spectroscopy. We furthermore show that the Tan contact exhibits a characteristic non-monotonic dependence on temperature that provides a signature of the zero-temperature polaron-molecule transition. For a finite impurity density, we argue that descriptions purely based on the behavior of the Fermi polaron are invalid near the polaron-molecule transition, since correlations between impurities cannot be ignored. In particular, we show that the spin-imbalanced system undergoes phase separation at low temperatures due to the strong attraction between $\uparrow\downarrow$ molecules induced by the Fermi sea. Thus, we find that the impurity spectrum and the induced impurity-impurity interactions are key to understanding the phase diagram of the spin-imbalanced Fermi gas.
description: 15 pages, 9 figures
Using the ROSAT Bright Source Catalogue to find Counterparts for IBIS/ISGRI Survey Sources
Creators: name: Stephen, J. B.
name: Bassani, L.
name: Molina, M.
name: Malizia, A.
name: Bazzano, A.
name: Ubertini, P.
name: Dean, A. J.
name: Bird, A. J.
name: Much, R.
name: Walter, R.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The IBIS/ISGRI first year galactic plane survey has produced a catalogue containing 123 hard X-ray sources visible down to a flux limit of a few milliCrabs. The point source location accuracy of typically 1-3 arcminutes has allowed the counterparts for 95 of these sources to be found at other wavelengths. In order to identify the remaining 28 objects, we have cross-correlated the ISGRI catalogue with the ROSAT All Sky Survey Bright Source Catalogue. In this way, for ISGRI sources which have a counterpart in soft X-rays, we can use the, much smaller, ROSAT error box to search for identifications. As expected, we find a strong correlation between the two catalogues and calculate that there are 75 associations with the number expected by chance to be almost zero. Of these 75 sources, ten are in the list of unidentified objects. Using the ROSAT error boxes we provide tentative associations for 8 of these.
description: 4 pages, 2 figures, to be published in A&A Letters
Interpretazione dialettica e fantasia esatta. Sul sistema in Adorno
Creators: name: Cherchi, Gianpaolo
Publisher: name: Università degli Studi di Milano
Year: 2015

description: Adorno’s negative dialectics wants to free the thought from the dictates of the system, taking position against the illusion to grasp the essence of reality by logic. Against that false idea of totality, Adorno devises a philosophy of  fragment, a logic of disgregation that presupposes a different concept of totality: a fragmented, scattered and conflicting wholeness. The anti systematic thinking of Adorno is configured, however, as a systematic rejection of any systematic formulation: philosophy can at most claiming a pretension to truth by the practice of interpretation. A dialectic configuration of fragments of totality is at stake here: so, the arrangement of such fragments can both produce an image of reality endowed with meaning and also unfold through heterogeneous combinations that are not definitive, but always renewable from time to time. In Adorno’s reflection are so expressed two different instances which are complementary at the same time: on the one hand it represents the critical and negative element against the system and its hybris, on the other hand it expresses the need of the thought to go beyond and overcome that fragmentation, showing how the need of unity of the system is a need of the thought in itself.
description: Itinera, No 10 (2015): Sistema e libertà. Razionalità e improvvisazione tra filosofia, arte e pratiche umane.
Four-point susceptibility of a glass-forming binary mixture: Brownian dynamics
Creators: name: Szamel, Grzegorz
name: Flenner, Elijah
Publisher: name: arXiv
Year: 2006
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the four-point dynamic susceptibility $χ_4(t)$ obtained from Brownian dynamics computer simulations of the Kob-Andersen Lennard-Jones mixture. We compare the results of the simulations with qualitative predictions of the mode-coupling theory. In addition, we test an estimate of the four-point susceptibility recently proposed by Berthier \textit{et al.} [Science, \textbf{310}, 1797 (2005)].
Subjektive Sicherheit und Lebensqualität : eine empirische Untersuchung in Hoyerswerda
Creators: name: Burgheim, Joachim
name: Sterbling, Anton
Publisher: name: Universität Tübingen
Year: 1999

description: Seite 155 und 156 fehlen, da auf diesen Seiten Werbung abgedruckt ist.
Il doppio legame dell’interpretazione: conservazione e innovazione della tradizione
Creators: name: Martinengo, Alberto
Publisher: name: Università degli Studi di Milano
Year: 2015

description: The crisis of hermeneutical philosophy is an important opportunity for a reflection on the adaptive forms of rationality. The present essay aims at clarifying two issues of adaptiveness in a hermeneutical perspective: the overturning of the traditional relationships between theoria and praxis; and the place of the rule-violation in this pragmatical view of rationality. Metaphor is the most significant example of this adaptiveness.
description: Itinera, No 10 (2015): Sistema e libertà. Razionalità e improvvisazione tra filosofia, arte e pratiche umane.
Warm bounce in loop quantum cosmology and the prediction for the duration of inflation
Creators: name: Barboza, L. N
name: Graef, L. L.
name: Ramos, Rudnei O.
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study and estimate probabilistic predictions for the duration of the preinflationary and slow-roll phases after the bounce in loop quantum cosmology, determining how the presence of radiation in the prebounce phase affects these results. We present our analysis for different classes of inflationary potentials that include the monomial power-law chaotic type of potentials, namely, for the quadratic, quartic and sextic potentials and also for a Higgs-like symmetry breaking potential, considering different values for the vacuum expectation value in the latter case. We obtain the probability density function for the number of inflationary e-folds and for other relevant quantities for each model and produce probabilistic results drawn from these distributions. This study allows us to discuss under which conditions each model could eventually lead to observable signatures on the spectrum of the cosmic microwave background, or, else, be also excluded for not predicting a suffcient amount of accelerated expansion. The effect of radiation on the predictions for each model is explicitly quantified. The obtained results indicate that the number of inflationary e-folds in loop quantum cosmology is not a priori an arbitrary number, but can in principle be a predictable quantity, even though the results are dependent on the model and on the amount of radiation in the Universe prior to the start of the inflationary regime.
description: References added and some typos corrected with respect to the published version
Text: Story of Vaju
Creators: name: Criollo Sr., Jorge
name: Dabkowski, Maksymilian
name: Quenamá, Leidy
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2021
Subjects: subject: con

description: A group of people would always go to the mountain, and they met the Vaju (demons). The Vayu ate all of them; only one of their friends got away. The friend that got away went to let other friends know in order to take revenge on the Vaju that had killed his friends. They burned all of the Vaju and the Vaju died.
L’improvvisazione creatrice Ricoeur, Florenskij e Balthasar: tra sistemi di riferimento e libertà creativa
Creators: name: Annovazzi, Claudia Elisa
Publisher: name: Università degli Studi di Milano
Year: 2015

description: The aim of this paper is to reflect on improvisation by means of discussing the relation between system and freedom. I begin with a reflection on the meanings of improvisation. Than, following Ricoeur’s philosophy and Florenskij’s iconology I show that creativity works like an innovation within the tradition. At the end, I claim that Balthasar’s theological aesthetics gives interesting contributions to the hermeneutic of testimony, that, in turn, helps to understand why the connection between system and freedom is key to the process of improvisation.
description: Itinera, No 10 (2015): Sistema e libertà. Razionalità e improvvisazione tra filosofia, arte e pratiche umane.
MPEC 2024-A78 : 2024 AO1
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2024 AO1

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Optimally Controlled Field-Free Orientation of the Kicked Molecule
Creators: name: Dion, Claude M.
name: Keller, Arne
name: Atabek, Osman
Publisher: name: arXiv
Year: 2005
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Efficient and long-lived field-free molecular orientation is achieved using only two kicks appropriately delayed in time. The understanding of the mechanism rests upon a molecular target state providing the best efficiency versus persistence compromise. An optimal control scheme is referred to for fixing the free parameters (amplitudes and the time delay between them). The limited number of kicks, the robustness and the transposability to different molecular systems advocate in favor of the process, when considering its experimental feasibility.
description: 5 pages, 2 figures (version 2 contains some minor additions and corrects many misprints)
Orbital Eccentricity -- Multiplicity Correlation for Planetary Systems and Comparison to the Solar System
Creators: name: Bach-Møller, Nanna
name: Jørgensen, Uffe Gråe
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The orbit eccentricities of the Solar System planets are unusually low compared to the average of known exoplanetary systems. A power law correlation has previously been found between the multiplicity of a planetary system and the orbital eccentricities of its components, for systems with multiplicities above two. In this study we investigate the correlation for an expanded data sample, by focusing on planetary systems as units (unlike previous studies that have focused on individual planets). Our full data sample contains 1171 exoplanets, in 895 systems, and the correlation between eccentricity and multiplicity is found to follow a clear power law for all multiplicities above one. We discuss the correlation for several individual subsamples, and find that all samples consistently follow the same basic trend regardless of e.g. planet types and detection methods. We find that the eccentricities of the Solar System fit the general trend and suggest that the Solar System might not show uncommonly low eccentricities (as often speculated) but rather uncommonly many planets compared to a "standard" planetary system. The only outlier from the power law correlation is, consistently in all the samples, the one-planet systems. It has previously been suggested that this may be due to additional unseen exoplanets in the observed one-planet systems. Based on this assumption and the power law correlation, we estimate that the probability of a system having 8 planets or more is of the order of 1%, in good agreement with recent predictions from analyses based on independent arguments.
description: Accepted for publication in MNRAS; added acknowledgement
‘Mind the Gap’. L'improvvisazione come azione intenzionale
Creators: name: Bertinetto, Alessandro
Publisher: name: Università degli Studi di Milano
Year: 2015

description: In this paper I aim at discussing the following questions: is improvisation an intentional action? If it is an intentional action, in what sense is improvisation intentional? Can improvisation contribute to the understanding of intentional action? I will argue that improvisation is not a bizarre case of action or a weakened action, but an intentional action in the proper sense (provided with some specific properties). Moreover, improvisation exemplifies key features of intentional action as such.
description: Itinera, No 10 (2015): Sistema e libertà. Razionalità e improvvisazione tra filosofia, arte e pratiche umane.
No hair conjecture, nonabelian hierarchies and anti-de Sitter spacetime
Creators: name: Radu, Eugen
name: Tchrakian, D. H.
Publisher: name: arXiv
Year: 2005
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider globally regular and black holes solutions for the Einstein-Yang-Mills system with negative cosmological constant in $d-$spacetime dimensions. We find that the ADM mass of the spherically symmetric solutions generically diverges for $d>4$. Solutions with finite mass are found by considering corrections to the YM Lagrangean consisting in higher therm of the Yang--Mills hierarchy. Such systems can occur in the low energy effective action of string theory. A discussion of the main properties of the solutions and the differences with respect to the four dimensional case is presented. The mass of these configurations is computed by using a counterterm method.
description: 21 pages, 15 figures; v2: calculations clarified, references added
RELICS-DP7: Spectroscopic Confirmation of a Dichromatic Primeval Galaxy at z ~ 7
Creators: name: Pelliccia, Debora
name: Strait, Victoria
name: Lemaux, Brian C.
name: Bradac, Marusa
name: Coe, Dan
name: Bolan, Patricia
name: Bradley, Larry D.
name: Frye, Brenda
name: Gandhi, Pratik J.
name: Mainali, Ramesh
name: Mason, Charlotte
name: Ouchi, Masami
name: Sharon, Keren
name: Trenti, Michele
name: Zitrin, Adi
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We report the discovery of a spectroscopically-confirmed strong Lyman-$α$ emitter at $z=7.0281\pm0.0003$, observed as part of the Reionization Cluster Lensing Survey (RELICS). This galaxy, dubbed "Dichromatic Primeval Galaxy" at $z\sim7$ (DP7), shows two distinct components. While fairly unremarkable in terms of its ultraviolet (UV) luminosity ($\sim0.3L^{\ast}_{UV}$, where $L^{\ast}_{UV}$ is the characteristic luminosity), DP7 has one of the highest observed Lyman-$α$ equivalent widths (EWs) among Lyman-$α$ emitters at $z>6$ ($>200$ Angstrom in the rest frame). The strong Lyman-$α$ emission generally suggests a young metal-poor, low-dust galaxy; however, we find that the UV slope $β$ of the galaxy as a whole is redder than typical star-forming galaxies at these redshifts, $-1.13\pm 0.84$, likely indicating, on average, a considerable amount of dust obscuration, or an older stellar population. When we measure $β$ for the two components separately, however, we find evidence of differing UV colors, suggesting two separate stellar populations. Also, we find that Lyman-$α$ is spatially extended and likely larger than the galaxy size, hinting to the possible existence of a Lyman-$α$ halo. Rejuvenation or merging events could explain these results. Either scenario requires an extreme stellar population, possibly including a component of Population III stars, or an obscured Active Galactic Nucleus. DP7, with its low UV luminosity and high Lyman-$α$ EW, represents the typical galaxies that are thought to be the major contribution to the reionization of the Universe, and for this reason DP7 is an excellent target for follow-up with the James Webb Space Telescope.
description: 8 pages, 3 figures, 2 table. Accepted for publication in ApJL
Razionalità dell’improvvisazione / Improvvisazione della razionalità
Creators: name: Caporaletti, Vincenzo
Publisher: name: Università degli Studi di Milano
Year: 2015

description: The first part of the essay, Rationality of Improvisation, is developed through two complementary directions. On the one hand it traces the plot through which a specific determination of Western rationality has marked the art music tradition of modernity. On the other hand, it identifies a specific alternative cognitive modality, defined audiotactile, which is inherent to the formative creative practices in real time, showing how its constitutive incompatibility with the structural epistemic logic of Western rationality has led to the modern eclipse of the ex tempore creativity, and to its resurgence today. In the second part, Improvisation of Rationality, are discussed in a pragmatic perspective such aesthetic issues as improvisational freedom, the situational and stylistic conditioning and their relationship with the authenticity and with the aesthetic truth, and whether it is possible to identify prospects for a normativity in improvisation.
description: Itinera, No 10 (2015): Sistema e libertà. Razionalità e improvvisazione tra filosofia, arte e pratiche umane.
Measurements of Branching Fractions and Time-Dependent CP-Violating Asymmetries in B to eta' K Decays
Creators: name: The BaBar Collaboration
name: Aubert, B.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We present measurements of the B -> eta' K branching fractions;for B+ -> eta' K+ we measure also the time-integrated charge asymmetry Ach, and for B0 -> eta' K0S the time dependent CP-violation parameters S and C. The data sample corresponds to 232 million B Bbar pairs produced by e+ e- annihilation at the Upsilon(4S). The results are BF(B+ -> eta' K+) = (68.9 +- 2.0 +- 3.2) * 10^-6, BF(B0 -> eta' K0) = (67.4 +- 3.3 +- 3.2) * 10^-6, Ach = 0.033 +- 0.028 +- 0.005, S=0.30 +- 0.14 +- 0.02, C=-0.21 +- 0.10 +- 0.02, where the first error is statistical and the second systematic.
description: 7 pages, 2 postscript figures, submitted to Phys. Rev. Letters
Soft gluon resummation in Drell-Yan dilepton production at small transverse momentum: spin asymmetry and a novel asymptotic formula
Creators: name: Kawamura, Hiroyuki
name: Kodaira, Jiro
name: Tanaka, Kazuhiro
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We discuss the double-spin asymmetry \aqt in the transversely polarized Drell-Yan process at small transverse-momentum Q_T of the produced dilepton. The soft gluon corrections relevant for small Q_T are resummed to all orders in α_s, up to the next-to-leading logarithmic accuracy. We show that the soft gluon corrections largely cancel in the spin asymmetry, but the significant corrections still remain.The asymmetries \aqt are calculated for pp collision at RHIC and J-PARC, and for p\bar{p} collision at GSI. A novel asymptotic formula for \aqt at small Q_T is presented, which provides a new approach to extract the transversity δq(x) from the experimental data.
description: 6 pages, 2 figures, to appear in the proceedings of RADCOR2007, Florence, Italy, 1-5 Oct 2007
Main Parameters of Ilc-Tevatron Based Lepton-Hadron and Photon-Hadron Colliders
Creators: name: Cakir, O.
name: Ciftci, A. K.
name: Recepoglu, E.
name: Sultansoy, S.
name: Yavas, O.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: The construction of the ILC tangential to Tevatron ring will give opportunity to investigate electron-proton, positron-proton, electron-antiproton, positron-antiproton interactions at 1 TeV center of mass energy. The analysis of the lepton-hadron collisions in these energy region is very important both for understanding of strong interaction dynamics and for adequate interpretation of future LHC and VLHC data. In addition, ILC-Tevatron collider will provide a possibility to realize photon-hadron collisions in the same energy region using Compton backscattered laser photon off ILC electron beam. Main parameters of these colliders are estimated and their physics search potential is briefly discussed.
description: Presented at PAC05, 16-20 May 2005, Knoxville, TN, USA
Pluralité de “spuntos” et formativité audiotactile : un regard sur l’improvisation musicale collective
Creators: name: Araújo Costa, Fabiano
Publisher: name: Università degli Studi di Milano
Year: 2015

description: This paper looks at the interactional-improvisational aesthetic experience based on Luigi Pareyson’s notions of “formativity” and “spunto” as well as on the concepts and the taxonomy of Vincenzo Caporaletti’s audiotactile formativity theory. On the theoretical ground, we propose a deeper investigation of the key concepts in the audio tactil phenomenology, such as the “audiotactile principle” [ATP] and the “audiotactile conceptual schemes”. Original concepts for the study of musical interaction are also developed, noticeably the notion of the “interactional formative space” [IFS].
description: Itinera, No 10 (2015): Sistema e libertà. Razionalità e improvvisazione tra filosofia, arte e pratiche umane.
Free holomorphic functions on the unit ball of B(H)^n
Creators: name: Popescu, Gelu
Publisher: name: arXiv
Year: 2006
Subjects: subject: Functional Analysis (math.FA)
subject: Operator Algebras (math.OA)
subject: FOS: Mathematics
subject: 47A56; 47A13; 47A60; 46T25; 46E15

description: We develop a theory of holomorphic functions in several noncommuting (free) variables and thus provide a framework for the study of arbitrary n-tuples of operators. The main topics are the following: Free holomorphic functions and Hausdorff derivations; Cauchy, Liouville, and Schwartz type results for free holomorphic functions; Algebras of free holomorphic functions; Free analytic functional calculus and noncommutative Cauchy transforms; Weierstrass and Montel theorems for free holomorphic functions; Free pluriharmonic functions and noncommutative Poisson transforms; Hardy spaces of free holomorphic functions.
description: 51 pages
Invarianza, tempo e improvvisazione musicale.
Creators: name: Cosottini, Mirio
Publisher: name: Università degli Studi di Milano
Year: 2015

description: The notion of invariance permeates different research areas and often takes on different meanings. In different fields (psychology, phenomenology, physics, and ethics) the invariance concept attempts to explain the mechanisms of perceptual grouping. In this article invariance is considered a structural condition of our way of perceiving music and especially musical improvisation. It helps to understand the relationship between musical improvisation and nonlinearity, i.e. between what is transformed and what remains unchanged in the process of improvisation. I argue that every musical improvisation whose characteristics are nonlinear implies perceptual invariance with respect to time.
description: Itinera, No 10 (2015): Sistema e libertà. Razionalità e improvvisazione tra filosofia, arte e pratiche umane.
Extracting energy from black holes: "long" and "short" GRBs and their astrophysical settings
Creators: name: Ruffini, Remo
name: Bernardini, Maria Grazia
name: Bianco, Carlo Luciano
name: Chardonnet, Pascal
name: Fraschetti, Federico
name: Gurzadyan, Vahe
name: Lattanzi, Massimiliano
name: Vitagliano, Luca
name: Xue, She-Sheng
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The introduction of the three interpretational paradigms for Gamma-Ray Bursts (GRBs) and recent progress in understanding the X- and gamma ray luminosity in the afterglow allow us to make assessments about the astrophysical settings of GRBs. In particular, we evidence the distinct possibility that some GRBs occur in a binary system. This subclass of GRBs manifests itself in a "tryptich": one component formed by the collapse of a massive star to a black hole, which originates the GRB; a second component by a supernova and a third one by a young neutron star born in the supernova event. Similarly, the understanding of the physics of quantum relativistic processes during the gravitational collapse makes possible precise predictions about the structure of short GRBs.
description: 8 pages, 2 figures, to appear in the Proceedings of "Gamma-Ray Burst in the Afterglow Era: 4th Workshop", held in Rome, October 18-22, 2004, L. Piro, L. Amati, S. Covino, B. Gendre (eds.), Il Nuovo Cimento C, in press
Cumulants and factorial cumulants in the 3-dimensional Ising universality class
Creators: name: Pan, Xue
name: Xu, Mingmei
name: Wu, Yuanfang
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The high-order cumulants and factorial cumulants of conserved charges are suggested to study the critical dynamics in heavy ion collisions. In this paper, using parametric representation of the 3-dimensional Ising model, the sign distribution on the phase diagram and temperature dependence of the cumulants and factorial cumulants is studied and compared. In the vicinity of the critical point, the cumulants and factorial cumulants can not be distinguished. Far away from the critical point, sign changes occur in the factorial cumulants comparing with the same order cumulants. The cause of these sign changes is analysed. They may be used to measure the distance to the critical point.
description: 11 pages, 3 figures
Understanding the background in dark matter searches by studying antinucleosynthesis in the laboratory with ALICE
Creators: name: Hornung, Sebastian
Publisher: name: arXiv
Year: 2020
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Antinuclei are considered to be one of the most promising probes in the indirect search for dark matter (DM) annihilation in space. However, in light of recent results on the production of light antinuclei in pp collisions at the LHC, an abundant production of light (anti)nuclei is also expected from Standard Model (SM) collisions of primary cosmic rays with the interstellar medium. Hence further precise measurements are required to constrain the production models of antinuclei in SM collisions to be sensitive to additional DM annihilation events. The most recent results of the ALICE collaboration on the production of antideuterons ($\overline{\mathrm{d}}$) and antihelium-3 ($^3\overline{\text{He}}$) in proton-proton (pp) and proton-lead (p--Pb) collisions are shown. These results provide valuable input for state-of-the-art calculations of the production models currently used to estimate the SM background to DM searches.
description: 6 pages, 5 figures, proceeding of 40th International Conference on High Energy physics (ICHEP2020), July 28 - August 6, 2020, Prague, Czech Republic (virtual meeting)
Astrobiologically Interesting Stars within 10 parsecs of the Sun
Creators: name: de Mello, G. F. Porto
name: del Peloso, E. F.
name: Ghezzi, L.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The existence of life based on carbon chemistry and water oceans relies upon planetary properties, chiefly climate stability, and stellar properties, such as mass, age, metallicity and Galactic orbits. The latter can be well constrained with present knowledge. We present a detailed, up-to-date compilation of the atmospheric parameters, chemical composition, multiplicity and degree of chromospheric activity for the astrobiologically interesting solar-type stars within 10 parsecs of the Sun. We determine their state of evolution, masses, ages and space velocities, and produce an optimized list of candidates that merit serious scientific consideration by the future space-based interferometry probes aimed at directly detecting Earth-sized extrasolar planets and seeking spectroscopic infrared biomarkers as evidence of photosynthetic life. The initially selected stars number 33 solar-type within the population of 182 stars (excluding late M-dwarfs) closer than 10 pc. A comprehensive and detailed data compilation for these objects is still essentially lacking: a considerable amount of recent data has so far gone unexplored in this context. We present 13 objects as the nearest "biostars", after eliminating multiple stars, young, chromospherically active, hard X-ray emitting stars, and low metallicity objects. Three of these "biostars", HD 1581, 109358 and 115617, closely reproduce most of the solar properties and are considered as premier targets. We show that approximately 7% of the nearby stars are optimally interesting targets for exobiology.
description: 36 pages, recommended for publication in Astrobiology
Performance of IEEE 802.11 MAC protocol over a wireless LAN with distributed radio bridges
Creators: name: Chow, Cupid C.
Publisher: name: University of British Columbia
Year: 2009

description: In this thesis, the performance, in terms of throughput and access delay, of the proposed distributed Wireless Local Area Network employing the IEEE 802.11 Medium Access Control protocol is analyzed extensively by computer simulations. The proposed network is based on using the same frequency for the entire coverage area with multiple receivers or radio bridges (RBs), with or without capture effect at each receiver. Different channel environments, including the Additive White Gaussian Noise (AWGN) channel, log-normal shadowing channel, Rayleigh fading channel, and log-normal shadowing plus Rayleigh fading channel, are considered in the simulations. The effects of various parameters are also studied. The results show that the performance can be improved significantly by using more RBs except for A W G N channel. The performance improvement of multiple RBs over one R B depends on the system parameters. In the log-normal shadowing plus Rayleigh fading channel, the throughput with 4 RBs and no capture can be improved by at least 120% over one RB. It is found that multiple RBs are more effective in a system with large number of stations and for channels severely degraded by shadowing or fading. With the use of capture, the performance can be improved by multiple RBs. But the performance improvement of multiple RBs is about the same as no capture cases. The effect of capture ratio is studied. It is found that the performance increases with decreasing the capture ratio. The performance of one and two dimensional models are found to be slightly different. The throughput does not change with packet size; however, the access delay degrades with packet size. Finally, it is found that the performance is not significantly affected by the length of the acknowledgment time-out.
Perceptions of Private Sector towards the Pollutant Release and Transfer Register: A Case Study on Petrochemical Industry in the Map Ta Phut Industrial Estate, Rayong, Thailand
Creators: name: Kondo, Marie
name: Sangchan Limjirakan
Publisher: name: Thai Society of Higher Education Institutes on Environment
Year: 2013
Subjects: perception,private sector,Pollutant Release and Transfer Register (PRTR),petrochemical industry,Map Ta Phut Industrial Estate

description: 1, 6, EnvironmentAsia
G-automata, counter languages and the Chomsky hierarchy
Creators: name: Elder, Murray
Publisher: name: arXiv
Year: 2005
Subjects: subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 20F65

description: We consider how the languages of $G$-automata compare with other formal language classes. We prove that if the word problem of a group $G$ is accepted by a machine in the class $\mathcal M$ then the language of any $G$-automaton is in the class $\mathcal M$. It follows that the so called {\emph counter languages} (languages of $\mathbb Z^n$-automata) are context-sensitive, and further that counter languages are indexed if and only if the word problem for $\mathbb Z^n$ is indexed.
description: 5 pages