cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Geometric Exponents, SLE and Logarithmic Minimal Models
Creators: name: Saint-Aubin, Yvan
name: Pearce, Paul A.
name: Rasmussen, Jorgen
Publisher: name: arXiv
Year: 2008
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: In statistical mechanics, observables are usually related to local degrees of freedom such as the Q < 4 distinct states of the Q-state Potts models or the heights of the restricted solid-on-solid models. In the continuum scaling limit, these models are described by rational conformal field theories, namely the minimal models M(p,p') for suitable p, p'. More generally, as in stochastic Loewner evolution (SLE_kappa), one can consider observables related to nonlocal degrees of freedom such as paths or boundaries of clusters. This leads to fractal dimensions or geometric exponents related to values of conformal dimensions not found among the finite sets of values allowed by the rational minimal models. Working in the context of a loop gas with loop fugacity beta = -2 cos(4 pi/kappa), we use Monte Carlo simulations to measure the fractal dimensions of various geometric objects such as paths and the generalizations of cluster mass, cluster hull, external perimeter and red bonds. Specializing to the case where the SLE parameter kappa = 4p'/p is rational with p < p', we argue that the geometric exponents are related to conformal dimensions found in the infinitely extended Kac tables of the logarithmic minimal models LM(p,p'). These theories describe lattice systems with nonlocal degrees of freedom. We present results for critical dense polymers LM(1,2), critical percolation LM(2,3), the logarithmic Ising model LM(3,4), the logarithmic tricritical Ising model LM(4,5) as well as LM(3,5). Our results are compared with rigourous results from SLE_kappa, with predictions from theoretical physics and with other numerical experiments. Throughout, we emphasize the relationships between SLE_kappa, geometric exponents and the conformal dimensions of the underlying CFTs.
description: Added references
Neuromorphic Intermediate Representation: A Unified Instruction Set for Interoperable Brain-Inspired Computing
Creators: name: Pedersen, Jens E.
name: Abreu, Steven
name: Jobst, Matthias
name: Lenz, Gregor
name: Fra, Vittorio
name: Bauer, Felix C.
name: Muir, Dylan R.
name: Zhou, Peng
name: Vogginger, Bernhard
name: Heckel, Kade
name: Urgese, Gianvito
name: Shankar, Sadasivan
name: Stewart, Terrence C.
name: Sheik, Sadique
name: Eshraghian, Jason K.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Neural and Evolutionary Computing (cs.NE)
subject: FOS: Computer and information sciences

description: Spiking neural networks and neuromorphic hardware platforms that simulate neuronal dynamics are getting wide attention and are being applied to many relevant problems using Machine Learning. Despite a well-established mathematical foundation for neural dynamics, there exists numerous software and hardware solutions and stacks whose variability makes it difficult to reproduce findings. Here, we establish a common reference frame for computations in digital neuromorphic systems, titled Neuromorphic Intermediate Representation (NIR). NIR defines a set of computational and composable model primitives as hybrid systems combining continuous-time dynamics and discrete events. By abstracting away assumptions around discretization and hardware constraints, NIR faithfully captures the computational model, while bridging differences between the evaluated implementation and the underlying mathematical formalism. NIR supports an unprecedented number of neuromorphic systems, which we demonstrate by reproducing three spiking neural network models of different complexity across 7 neuromorphic simulators and 4 digital hardware platforms. NIR decouples the development of neuromorphic hardware and software, enabling interoperability between platforms and improving accessibility to multiple neuromorphic technologies. We believe that NIR is a key next step in brain-inspired hardware-software co-evolution, enabling research towards the implementation of energy efficient computational principles of nervous systems. NIR is available at neuroir.org
description: NIR is available at https://neuroir.org
Influence of a spatial anisotropy on presence of the intermediate one-half magnetization plateau of a spin-1/2 Ising-Heisenberg branched chain
Creators: name: Strecka, Jozef
name: Karlova, Katarina
name: Ghannadan, Azadeh
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: A spin-1/2 Ising-Heisenberg branched chain constituted by regularly alternating Ising spins and Heisenberg dimers involving an additional side branching is exactly solved in a magnetic field by the transfer-matrix method. The spin-1/2 Ising-Heisenberg branched chain involves two different Ising and one Heisenberg coupling constants. The overall ground-state phase diagram is formed by three different ground states emergent depending on a mutual interplay between the magnetic field and three considered coupling constants: the modulated quantum antiferromagnetic phase, the quantum ferrimagnetic phase, and the classical ferromagnetic phase. It is shown that the interaction anisotropy connected to two different Ising coupling constants substantially influences a breakdown of the intermediate one-half magnetization plateau, which represents a macroscopic manifestation of the quantum ferrimagnetic phase.
description: 4 pages, 3 figures, presented at Physics of Magnetism 2021 conference
Kahler manifolds with quasi-constant holomorphic curvature
Creators: name: Jelonek, Wlodzimierz
Publisher: name: arXiv
Year: 2008
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53C55, 53C25

description: The aim of this paper is to classify compact Kahler manifolds with quasi-constant holomorphic sectional curvature.
description: 18 pages
Familienbilder - Aushandlung von Familie in Foto-Interviews mit Wiener Romnija und Roma
Creators: name: Hazod, Thassilo Veit
Year: 2018

description: Die vorliegende Arbeit widmet sich Familienbildern von Romnija und Roma aus Wien. „Familienbilder“ meint nicht nur die in Interviews gezeigten und besprochenen privaten Fotografien, sondern im umfassenden Sinne individuelle Vorstellungen und Bedeutungszuschreibungen von Familie. Diese wurden mit der Methode des Foto-Interviews erfasst, die es den Beteiligten ermöglichen sollte, sich und ihre Familie mittels Erzählung und mitgebrachter Fotos zu präsentieren. Die wissenschaftliche und allgemein-gesellschaftliche Auseinandersetzung mit Romnija und Roma blickt auf eine denkwürdige Geschichte der Fremd-Repräsentation zurück. Diese ist von Exotisierung und Diffamierung gekennzeichnet. Die Arbeit skizziert vergangene und gegenwärtige Prozesse der Kollektivierung und Zuschreibung einer vermeintlichen Randgruppe als fremd und anders. Der Zugang dieser Arbeit liegt im Bemühen diese Prozesse gesellschaftlicher Aushandlungen, aber auch Dynamiken der Selbst- und Fremdethnisierung bzw. -kulturalisierung im Rahmen der Forschung zu reflektieren und im eigenen Tun behutsam und transparent vorzugehen. Über ein allgemein-gesellschaftliches Phänomen, der Familienfotografie, sollen Einsichten in Lebensrealitäten Wiener Romnija und Roma gewonnen werden. Die vorliegende Arbeit fokussiert gemäß den Ergebnissen der Interviewanalysen zuerst auf die Selbstrepräsentation der InterviewpartnerInnen, auf Formen der Ich- und Wir-Inszenierung. Danach werden einzelne zentrale Aspekte im Reden über Familie diskutiert: Familienformen und –ideen, Fotografie als familiäre Praxis, Familienwissen und –erinnerung, Verortungen von Familie sowie Familie als (zwischenmenschliche) Beziehung. Familiäre Fotografie und das Reden über Familie sind höchst private und emotionale Angelegenheiten. Darin offenbaren sich Wünsche, Normen, Ideale von Familie, aber auch prägende biographische Brüche und Auseinandersetzungen. Über das Thema werden zudem, nicht zuletzt durch die Fragestellung vorgegeben, verschiedene Bedeutungen und Ambivalenzen von Roma-Zugehörigkeit mitverhandelt. Familie erwies sich in den Interviews als ein flexibles Gefüge, als persönlicher, höchst relevanter Wert, der von außen nicht vorauszusetzen, immer in Bewegung ist.
Retarded integral inequalities of Gronwall-Bihari type
Creators: name: Ferreira, Rui A. C.
name: Torres, Delfim F. M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 26D10, 26D15

description: We establish two nonlinear retarded integral inequalities. Bounds on the solution of some retarded equations are then obtained.
description: 9 pages
Synthesis and applications of N-Metallo ketene imines
Creators: name: Qin, Wenling <1985>
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2014
Subjects: CHIM/06 Chimica organica

description: N-metallo ketene imines are attractive for the preparation of a wide range of organic compounds. Our research group has been engaged in the preparation and application of the N-metallo imines (SKIs). In this frame we have studied the uncatalyzed reaction of SKIs with isocyanates to give the corresponding malonamides with good yields. It has been demonstrated that the use of SKIs, instead of simple lithium anion of nitriles, is essential for the success of the reaction. A possible explanation assumes that this new reaction proceeds via a silatropism. In the course of our studies, reported in this thesis, the synthesis and the reactivity of N-silyl ketene imines in the preparation of 2,2-diaryl-3,4- dihydroxy- alcanonitrile in an uncatalyzed adol-type reaction has been performed. Our conception has been to use a chiral aldehyde to introduce asymmetric induction at the β-position and at the α-quaternary stereogenic center in the new forming diols. To achieve this goal, we used diarylacetonitrile as the substrate to form the corresponding N-trimethylsylilketene-imines to be reacted with (S)–lactic aldehyde with different protecting groups on the hydroxyl functionality. A number of 2,2-diaryl-3,4-dihydroxy-pentanenitrile were prepared with good to excellent stereo-control and satisfactory yields. Extension of this protocol to other metallo-ketene imines was performed. Accordingly, the preparation of tin ketene imines was attempted in analogy of the corresponding silyl ketene imine. The reaction of tin ketene imines with aldehydes was tested as a new tool for the synthesis of beta-hydroxynitriles starting from carbonyl compounds (aldehydes and/or ketones). Dialkyl(aryl)silyl nitriles and dialkyl(aryl)tin nitriles presents different reactivity. Finally, N-aluminium-ketene imines, as nucleophilic partner in the opening reaction of epoxides were studied. Preliminary positive results foster us to continue our studies in enlightening the scope and the limitations of this new reaction.
Knowledge Accumulation, Privacy, and Growth in a Data Economy
Creators: name: Cong, Lin William
name: Xie, Danxia
name: Zhang, Longtian
Publisher: name: arXiv
Year: 2021
Subjects: subject: Theoretical Economics (econ.TH)
subject: FOS: Economics and business

description: We build an endogenous growth model with consumer-generated data as a new key factor for knowledge accumulation. Consumers balance between providing data for profit and potential privacy infringement. Intermediate good producers use data to innovate and contribute to the final good production, which fuels economic growth. Data are dynamically nonrival with flexible ownership while their production is endogenous and policy-dependent. Although a decentralized economy can grow at the same rate (but are at different levels) as the social optimum on the Balanced Growth Path, the R&D sector underemploys labor and overuses data -- an inefficiency mitigated by subsidizing innovators instead of direct data regulation. As a data economy emerges and matures, consumers' data provision endogenously declines after a transitional acceleration, allaying long-run privacy concerns but portending initial growth traps that call for interventions.
Extending Implicit Computational Complexity and Abstract Machines to Languages with Control
Creators: name: Pellitta, Giulio <1984>
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2014
Subjects: INF/01 Informatica

description: The Curry-Howard isomorphism is the idea that proofs in natural deduction can be put in correspondence with lambda terms in such a way that this correspondence is preserved by normalization. The concept can be extended from Intuitionistic Logic to other systems, such as Linear Logic. One of the nice conseguences of this isomorphism is that we can reason about functional programs with formal tools which are typical of proof systems: such analysis can also include quantitative qualities of programs, such as the number of steps it takes to terminate. Another is the possiblity to describe the execution of these programs in terms of abstract machines.
   In 1990 Griffin proved that the correspondence can be extended to Classical Logic and control operators. That is, Classical Logic adds the possiblity to manipulate continuations. In this thesis we see how the things we described above work in this larger context.
The first measurement of the top quark mass at CDF II in the lepton+jets and dilepton channels simultaneously
Creators: name: CDF Collaboration
name: Aaltonen, T.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We present a measurement of the mass of the top quark using data corresponding to an integrated luminosity of 1.9fb^-1 of ppbar collisions collected at sqrt{s}=1.96 TeV with the CDF II detector at Fermilab's Tevatron. This is the first measurement of the top quark mass using top-antitop pair candidate events in the lepton + jets and dilepton decay channels simultaneously. We reconstruct two observables in each channel and use a non-parametric kernel density estimation technique to derive two-dimensional probability density functions from simulated signal and background samples. The observables are the top quark mass and the invariant mass of two jets from the W decay in the lepton + jets channel, and the top quark mass and the scalar sum of transverse energy of the event in the dilepton channel. We perform a simultaneous fit for the top quark mass and the jet energy scale, which is constrained in situ by the hadronic W boson mass. Using 332 lepton + jets candidate events and 144 dilepton candidate events, we measure the top quark mass to be mtop=171.9 +/- 1.7 (stat. + JES) +/- 1.1 (syst.) GeV/c^2 = 171.9 +/- 2.0 GeV/c^2.
description: submitted to Phys. Rev. D
Hopfield Neuronal Network of Fractional Order: A note on its numerical integration
Creators: name: Danca, Marius-F.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Numerical Analysis (math.NA)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: In this paper, the commensurate fractional-order variant of an Hopfield neuronal network is analyzed. The system is integrated with the ABM method for fractional-order equations. Beside the standard stability analysis of equilibria, the divergence of fractional order is proposed to determine the instability of the equilibria. The bifurcation diagrams versus the fractional order, and versus one parameter, reveal a strange phenomenon suggesting that the bifurcation branches generated by initial conditions outside neighborhoods of unstable equilibria are spurious sets although they look similar with those generated by initial conditions close to the equilibria. These spurious sets look ``delayed'' in the considered bifurcation scenario. Once the integration step-size is reduced, the spurious branches maintain their shapes but tend to the branches obtained from initial condition within neighborhoods of equilibria. While the spurious branches move once the integration step size reduces, the branches generated by the initial conditions near the equilibria maintain their positions in the considered bifurcation space. This phenomenon does not depend on the integration-time interval, and repeats in the parameter bifurcation space.
description: accepted in CS&F 2021
The length operator in Loop Quantum Gravity
Creators: name: Bianchi, Eugenio
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The dual picture of quantum geometry provided by a spin network state is discussed. From this perspective, we introduce a new operator in Loop Quantum Gravity - the length operator. We describe its quantum geometrical meaning and derive some of its properties. In particular we show that the operator has a discrete spectrum and is diagonalized by appropriate superpositions of spin network states. A series of eigenstates and eigenvalues is presented and an explicit check of its semiclassical properties is discussed.
description: 33 pages, 12 figures; NPB version
Autoencoder-based analytic continuation method for strongly correlated quantum systems
Creators: name: Kliczkowski, Maksymilian
name: Keyes, Lauren
name: Roy, Sayantan
name: Paiva, Thereza
name: Randeria, Mohit
name: Trivedi, Nandini
name: Maska, Maciej M.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: The single particle Green's function provides valuable information on the momentum and energy-resolved spectral properties for a strongly correlated system. In large-scale numerical calculations using quantum Monte Carlo (QMC), dynamical mean field theory (DMFT), including cluster-DMFT, one usually obtains the Green's function in imaginary-time $G(τ)$. The process of inverting a Laplace transform to obtain the spectral function $A(ω)$ in real-frequency is an ill-posed problem and forms the core of the analytic continuation problem. In this Letter, we propose to use a completely unsupervised autoencoder-type neural network to solve the analytic continuation problem. We introduce an encoder-decoder approach that, together with only minor physical assumptions, can extract a high-quality frequency response from the imaginary time domain. With a deeply tunable architecture, this method can, in principle, locate sharp features of spectral functions that might normally be lost using already well-established methods, such as maximum entropy (MaxEnt) methods. We demonstrate the strength of the autoencoder approach by applying it to QMC results of $G(τ)$ for a single-band Hubbard model. The proposed method is general and can also be applied to other ill-posed inverse problems.
description: 7 pages, 5 figures, supplement
Market networks and marketing behaviour : the organization of trade in southern Veracruz, Mexico
Creators: name: Scarnell, Aida Rosalind
Publisher: name: University of British Columbia
Year: 2010

description: This thesis arises out of a concern for the continuing disparity in the levels of development between the Western World, or developed countries and the Third World or less developed countries. Among the most disadvantaged axe the rural populations who constitute a high proportion of the population of Third World countries. In spite of the fact that the peasant sector is being increasingly drawn into the national economy tnrough the market system, there appears to be no concomitant rise in the standard of living and rural poverty persists in much of the Third World. The extent to which peasant farmers gain or lose through market participation depends largely on the form and structure of the market system, that is on the form taken by the network of trade flows and exchange centres and on the nature of relations between buyers and sellers. The primary objective of this thesis is to describe and analyze the historical development of the market system for the distribution of foodstaples produced by the peasant sector in southern Veracruz, Mexico since the turn of the century. It is argued that a dendritic-type market system, in which vertical flows predominate over horizontal exchange, developed in response to the demand for foodstaples from the urban industrial centres of Mexico. The lack of a well developed transportation network and the general inaccessibility of the region allowed a small group of merchants to dominate and control trade during the early half of the century. Hecent improvements in transportation and communication have facilitated the penetration of the area by outside buyers, causing a change in the spatial and structural organization of trade. The spatial distribution of the rural population, the system of production and changes in land use are also factors that have been instrumental in the particular formation of the market system. Pieldwork for this thesis was conducted during 1975 in six municipalities in southern Veracruz using inductive methods. Most of the data were derived from interviews with peasant farmers and traders, or middlemen, based within the field area, and substantiated further through participant observation, interviews with various public officials, politicians and prominent members of the conmiunity, and through bibliographic research. In evaluating the impact of changes in the market system on the local economy, it would appear that the marketing opportunities for peasant producers have improved only marginally. Peasants continue to sell their produce to middlemen at prices below that of the guaranteed minimum price set by the government. Truckers entering the region from major urban centres are reluctant to engage in numerous transactions with small scale producers, and prefer to deal with local middlemen.
Effect of uniaxial single-ion anisotropy on a stability of intermediate magnetization plateaus of a spin-1 Heisenberg diamond cluster
Creators: name: Karlova, Katarina
name: Strecka, Jozef
name: Hagiwara, Masayuki
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Ground-state phase diagrams and magnetization curves of a spin-1 Heisenberg diamond cluster with two different coupling constants and uniaxial single-ion anisotropy are investigated in a presence of the external magnetic field with the help of exact diagonalization methods. It is shown that the spin-1 Heisenberg diamond cluster exhibits several remarkable quantum ground states, which are manifested in zero- and low-temperature magnetization curves as intermediate plateaus at one-quarter, one-half and three-quarters of the saturation magnetization. It is found that the width of the fractional magnetization plateaus depends basically on a relative strength of the coupling constants as well as uniaxial single-ion anisotropy, which may substantially shrink or even cause full breakdown of some intermediate magnetization plateaus. It is evidenced that a relatively weak uniaxial single-ion anisotropy of the easy-axis type considerably improves a theoretical fit of low-temperature magnetization curves of the tetranuclear nickel complex [Ni4(CO3)2(aetpy)8](ClO4)4 in a low-field region without spoiling the previous fit based on the fully isotropic Heisenberg model in a high-field region.
description: 4 pages, 4 figures, presented at Physics of magnetism conference
Optimizing ZX-Diagrams with Deep Reinforcement Learning
Creators: name: Nägele, Maximilian
name: Marquardt, Florian
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: Machine Learning (cs.LG)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: ZX-diagrams are a powerful graphical language for the description of quantum processes with applications in fundamental quantum mechanics, quantum circuit optimization, tensor network simulation, and many more. The utility of ZX-diagrams relies on a set of local transformation rules that can be applied to them without changing the underlying quantum process they describe. These rules can be exploited to optimize the structure of ZX-diagrams for a range of applications. However, finding an optimal sequence of transformation rules is generally an open problem. In this work, we bring together ZX-diagrams with reinforcement learning, a machine learning technique designed to discover an optimal sequence of actions in a decision-making problem and show that a trained reinforcement learning agent can significantly outperform other optimization techniques like a greedy strategy, simulated annealing, and state-of-the-art hand-crafted algorithms. The use of graph neural networks to encode the policy of the agent enables generalization to diagrams much bigger than seen during the training phase.
description: 9 pages, 4 figures - Revision 1 on 26.04.2024: Fixed bug in training algorithm to give quantitatively better results (qualitative results unchanged) - Revision 2 on 30.09.2024: Added comparison to PyZX algorithm and extended the explanation of GNNs and ZX-calculus
Kalaallit Nunaat
Creators: name: Withalm-Wendtner, Philipp Immanuel
Year: 2019

description: This work deals with two major topics that are interwoven. On the one hand the history of Greenland, its four Inuit peoples, its relations with Denmark, the quarrels between Denmark, Norway and the Netherlands, as well as interventions by the US until the Inuit´s independence process from 1721 – the arrival of the missionary Hans Egedes – until today. On the other hand, it is about the various names and attributions that the Inuit received from the immigrants and colonists, missionaries and occupants, as well as researchers, and in which phases those have expired.
description: Diese Arbeit befasst sich mit zwei großen Themen, die miteinander verwoben sind. Zum ei-nen mit der Geschichte Grönlands, seiner vier Inuit-Völker, der Beziehungen zu Dänemark, der Streitigkeiten zwischen Dänemark, Norwegen und den Niederlanden sowie Interventionen der USA bis zum heutigen Unabhängigkeitsprozess der Inuit ab dem Jahre 1721 – der Ankunft des Missionars Hans Egedes – bis heute. Zum anderen geht es um die verschiedenen Bezeichnungen und Zuschreibungen, die die Inuit von den Einwanderer/innen und Kolonist/innen, Missionaren und Besetzer/innen sowie Forschern und Forscherinnen erhalten haben und in welchen Phasen diese abgelaufen sind.
Partonic State and Single Transverse Spin Asymmetry in Drell-Yan Process
Creators: name: Ma, J. P.
name: Sang, H. Z.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Single transverse-spin asymmetries have been studied intensively both in experiment and theory. Theoretically, two factorization approaches have been proposed. One is by using transverse-momentum-dependent factorization and the asymmetry comes from the so called Sivers function. Another is by using collinear factorization where the nonperturbative effect is parameterized by a twist-3 hadronic matrix element. However, the factorized formulas for the asymmetries in the two approaches are derived at hadron level formally by diagram expansion, where one works with various parton density matrices of hadrons. If the two factorizations hold, they should also hold at parton level. We examine this for Drell-Yan processes by replacing hadrons with partons. By calculating the asymmetry, Sivers function and the twist-3 matrix element at nontrivial leading order of $α_s$, we find that we can reproduce the result of the transverse-momentum-dependent factorization. But we can only verify the result of the collinear factorization partly. Two formally derived relations between Sivers function and the twist-3 matrix element are also examined with negative results.
description: 15 pages, 6 figures
Equation of state and effective mass of the unitary Fermi gas in a 1D periodic potential
Creators: name: Watanabe, Gentaro
name: Orso, Giuliano
name: Dalfovo, Franco
name: Pitaevskii, Lev P.
name: Stringari, Sandro
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: By solving the Bogoliubov -- de Gennes equations at zero temperature, we study the effects of a one-dimensional optical lattice on the behavior of a superfluid Fermi gas at unitarity. We show that, due to the lattice, at low densities the gas becomes highly compressible and the effective mass is large, with a consequent significant reduction of the sound velocity. We discuss the role played by the lattice in the formation of molecules and the emergence of two-dimensional effects in the equation of state. Predictions for the density profiles and for the frequency of the collective oscillations in the presence of harmonic trapping are also given.
description: 6 pages, 4 figures, to appear in Phys. Rev. A
Radiative heat transfer at nanoscale: experimental trends and challenges
Creators: name: Lucchesi, Christophe
name: Vaillon, Rodolphe
name: Chapuis, Pierre-Olivier
Publisher: name: arXiv
Year: 2021
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Energy transport theories are being revisited at the nanoscale, as macroscopic laws known since a century are broken at dimensions smaller than those associated with energy carriers. For thermal radiation, where the typical dimension is provided by Wien's wavelength, Planck's law and associated concepts describing surface-to-surface radiative transfer have to be replaced by a full electromagnetic framework capturing near-field radiative heat transfer (photon tunnelling between close bodies), interference effects and sub-wavelength thermal emission (emitting body of small size). It is only during the last decade that nanotechnology has allowed for many experimental verifications-with a recent boom-of the large increase of radiative heat transfer at nanoscale. In this minireview, we highlight the parameter space that has been investigated until now, showing that it is limited in terms of inter-body distance, temperature and object size, and provide clues about possible thermal-energy harvesting, sensing and management applications. We also provide an outlook on open topics, underlining some difficulties in applying single-wavelength approaches to broadband thermal emitters while acknowledging the promises of thermal nanophotonics and observing that molecular/chemical viewpoints have been hardly addressed. Context: revisiting thermal radiative energy transport and conversion at the nanoscale
TPA3D: Triplane Attention for Fast Text-to-3D Generation
Creators: name: Wu, Bin-Shih
name: Chen, Hong-En
name: Huang, Sheng-Yu
name: Wang, Yu-Chiang Frank
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Due to the lack of large-scale text-3D correspondence data, recent text-to-3D generation works mainly rely on utilizing 2D diffusion models for synthesizing 3D data. Since diffusion-based methods typically require significant optimization time for both training and inference, the use of GAN-based models would still be desirable for fast 3D generation. In this work, we propose Triplane Attention for text-guided 3D generation (TPA3D), an end-to-end trainable GAN-based deep learning model for fast text-to-3D generation. With only 3D shape data and their rendered 2D images observed during training, our TPA3D is designed to retrieve detailed visual descriptions for synthesizing the corresponding 3D mesh data. This is achieved by the proposed attention mechanisms on the extracted sentence and word-level text features. In our experiments, we show that TPA3D generates high-quality 3D textured shapes aligned with fine-grained descriptions, while impressive computation efficiency can be observed.
description: ECCV2024, Project Page: https://redxouls.github.io/TPA3D/
EOSC as an Enabler of Research Assessment Reform: Position Paper from Task Force on Research Careers, Recognition, and Credit
Creators: name: Nilsonne, Gustav
name: O'Neill, Gareth
name: Dahle, Sebastian
name: Gaillard, Vinciane
name: Priess-Buchheit, Julia
name: Birgit, Schmidt
name: Psomopoulos, Fotis
Publisher: name: Zenodo
Year: 2023
Subjects: Research Assessment
CoARA
EOSC
EOSC-A

description: This position paper presents recommendations from the TF RCRC on reforming research assessment to support researchers engaging with EOSC. The recommendations are aimed at the EOSC Partnership and EOSC-A (including the members of EOSC-A) to strategically contribute to the reform of research assessment with respect to EOSC and Open Science.
Pulse profile variability associated with the glitch of PSR J1048$-$5832
Creators: name: Liu, P.
name: Yuan, J. -P.
name: Ge, M. -Y.
name: Ye, W. -T.
name: Zhou, S. -Q.
name: Dang, S. -J.
name: Zhou, Z. -R.
name: Gügercinoğlu, E.
name: Wang, W. -H.
name: Wang, P.
name: Li, A.
name: Li, D.
name: Wang, N.
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: PSR J1048$-$5832 (B1046$-$58) is a Vela-like pulsar that has exhibited multiple glitch events. In this study, we analyze the timing data spanning nearly 16 years, acquired from both the Fermi Gamma-ray Space Telescope and the Parkes 64 m radio telescope. As a result, a total of five glitches are detected within this dataset. Among them, a previously unknown small glitch is newly found at MJD 56985(9) (November 24, 2014), making it the smallest glitch recorded from this source so far. The increments of the spin frequency and its first derivative are $Δν\approx 2.2(3) \times 10^ {-8} $ Hz, and $Δ\dotν \approx 3(2) \times 10^ {-15}$ s$^{-2}$, respectively. Significant changes in the integrated normalized mean pulse profile are detected following three of the five glitch events, notably in the radio band. Although no evidence of a correlation is found between the spin-down rate and profile evolution, the jump phenomenon of $W_{55}$ (pulse width at the 55% peak amplitude) after the glitch in the narrow mode suggests that the glitch may influence the profile change. We discuss the influence of glitches on the pulsar's emission properties in terms of platelet motion by a crustquake and also put constraints on the equation of state from the moment of inertia and response timescales of involved superfluid layers inside the neutron star.
description: 14 pages, 7 figures, 6 tables, MNRAS (2024) accepted
Maximal spanning trees, asset graphs and random matrix denoising in the analysis of dynamics of financial networks
Creators: name: Heimo, Tapio
name: Kaski, Kimmo
name: Saramaki, Jari
Publisher: name: arXiv
Year: 2008
Subjects: subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: We study the time dependence of maximal spanning trees and asset graphs based on correlation matrices of stock returns. In these networks the nodes represent companies and links are related to the correlation coefficients between them. Special emphasis is given to the comparison between ordinary and denoised correlation matrices. The analysis of single- and multi-step survival ratios of the corresponding networks reveals that the ordinary correlation matrices are more stable in time than the denoised ones. Our study also shows that some information about the cluster structure of the companies is lost in the denoising procedure. Cluster structure that makes sense from an economic point of view exists, and can easily be observed in networks based on denoised correlation matrices. However, this structure is somewhat clearer in the networks based on ordinary correlation matrices. Some technical aspects, such as the random matrix denoising procedure, are also presented.
description: 23 pages, 12 figures, 1 table. v2: 3 references added, minor revisions
The effect of phased recurrent units in the classification of multiple catalogs of astronomical lightcurves
Creators: name: Donoso-Oliva, C.
name: Cabrera-Vives, G.
name: Protopapas, P.
name: Carrasco-Davis, R.
name: Estevez, P. A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: In the new era of very large telescopes, where data is crucial to expand scientific knowledge, we have witnessed many deep learning applications for the automatic classification of lightcurves. Recurrent neural networks (RNNs) are one of the models used for these applications, and the LSTM unit stands out for being an excellent choice for the representation of long time series. In general, RNNs assume observations at discrete times, which may not suit the irregular sampling of lightcurves. A traditional technique to address irregular sequences consists of adding the sampling time to the network's input, but this is not guaranteed to capture sampling irregularities during training. Alternatively, the Phased LSTM unit has been created to address this problem by updating its state using the sampling times explicitly. In this work, we study the effectiveness of the LSTM and Phased LSTM based architectures for the classification of astronomical lightcurves. We use seven catalogs containing periodic and nonperiodic astronomical objects. Our findings show that LSTM outperformed PLSTM on 6/7 datasets. However, the combination of both units enhances the results in all datasets.
Origins of electromagnetic radiation from spintronic terahertz emitters: A time-dependent density functional theory plus Jefimenko equations approach
Creators: name: Kefayati, Ali
name: Nikolic, Branislav K.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Microscopic origins of charge currents and electromagnetic (EM) radiation generated by them in spintronic THz emitters -- such as, femtosecond laser pulse-driven single magnetic layer or its heterostructures with a nonmagnetic layer hosting strong spin-orbit coupling (SOC) -- remain poorly understood despite nearly three decades since the discovery of ultrafast demagnetization. We introduce a first-principles method to compute these quantities, where the dynamics of charge and current densities is obtained from real-time time-dependent density functional theory (TDDFT), which are then fed into the Jefimenko equations for properly retarded electric and magnetic field solutions of the Maxwell equations. By Fourier transforming different time-dependent terms in the Jefimenko equations, we unravel that in 0.1--30 THz range the electric field of far-field EM radiation by Ni layer, chosen as an example, is {\em dominated by charge current pumped by demagnetization}, while often invoked magnetic dipole radiation from time-dependent magnetization of a single magnetic layer is a negligible effect. Such overlooked case of charge current pumping by time-dependent quantum system, whose magnetization is shrinking while its vector does not rotate, does not require any spin-to-charge conversion via SOC effects. In Ni/Pt bilayer, EM radiation remains dominated by charge current within Ni layer, whose magnitude is larger than in the case of single Ni layer due to faster demagnetization, while often invoked spin-to-charge conversion within Pt layer provides additional but smaller contribution. By using Poynting vector and its flux, we also quantify efficiency of conversion of light into emitted EM radiation, as well as the angular distribution of the latter.
description: 7 pages, 3 figures; Supplemental Material with three additional figures is available from this https://wiki.physics.udel.edu/qttg/Publications
La resistenza dei legami. Narrazioni e rappresentazioni della famiglia nella trilogia di romanzi “Past Imperfect” (2004-2011) di Nuruddin Farah
The Resistance of Links. Narrations and Representations of the Family in Nuruddin Farah's Trilogy of Novels "Past Imperfect" (2004-2011)
Creators: name: Mari, Lorenzo <1984>
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2014
Subjects: L-LIN/10 Letteratura inglese

description: Il presente progetto di ricerca riguarda la terza trilogia di romanzi di Nuruddin Farah, “Past Imperfect” (2004-2011). L’analisi dei tre testi che compongono la trilogia – “Links” (2004), “Knots” (2007) e “Crossbones” (2011) – evidenzia la persistente rilevanza delle narrazioni e delle rappresentazioni della famiglia all’interno di tutta la produzione letteraria dell’autore. Questa prospettiva critica richiede l’impiego di una metodologia che riunisce vari aspetti della critica letteraria di matrice post-strutturalista e, per altri versi, di stampo materialista, assecondando così le due principali tendenze critiche presenti all’interno degli studi postcoloniali. Lo stesso approccio teorico-metodologico può essere applicato anche in altri due ambiti critici chiamati in causa dalla trilogia di Nuruddin Farah: la cosiddetta “world literature” e la cosiddetta “failed-state fiction”. L’analisi delle narrazioni e delle rappresentazioni della famiglia richiede, inoltre, un approccio interdisciplinare molto esteso, stimolando ricerche negli ambiti della semiotica, dell’antropologia, della psicanalisi, dei Gender Studies e dei Trauma Studies.
description: The research project focuses on Nuruddin Farah’s third trilogy of novels, “Past Imperfect” (2004-2011). The analysis of the three novels included in the series – “Links” (2004), “Knots” (2007) and “Crossbones” (2011) – shows the persistency and the importance of the narrations and representations of the family throughout Nuruddin Farah’s literary production. This specific critical engagement requires a methodology which binds post-structuralist and materialist criticism together, according to the two main critical trends also used in Postcolonial Studies. The same approach can be also applied in two other critical fields which Nuruddin Farah’s trilogy allows reference to: “world literature” and “failed-state fiction”. The analysis of the narrations and the representations of the family, however, calls also for a broader interdisciplinary approach, involving further investigations in semiotics, anthropology, psychoanalysis, Gender and Trauma Studies.
EOSC AAI Architecture 2022
Creators: name: Kanellopoulos, Christos
name: Liampotis, Nicolas
Publisher: name: Zenodo
Year: 2023
Subjects: Authentication and Authorization Infrastructure Architecture
Access Control
European Open Science Cloud (EOSC)

description: The Authentication and Authorization Infrastructure Architecture (AAI) Task Force aims to provide a consistent architecture for Authentication, Authorization and Access Control for the European Open Science Cloud (EOSC). This report captures the current status of the EOSC AAI architecture discussions and identifies the challenges and the areas that require further work. Target audiences include AAI experts, operators of organisations providing services to the EOSC, organisations operating proxies that aggregate other service providers or enrich identities, and providers of authentication identities whose identities are used by EOSC services or by EOSC proxies.

This report provides valuable insights to help these target groups understand, implement, and interoperate within the defined AAI architecture.
description: Deliverable from the Authentication and Authorization Infrastructure Architecture (AAI) Task Force of the European Open Science Cloud Association (EOSC-A).
Pubblici poteri e signorie di castello nella romagna nord-occidentale (secoli XI-XIII)
Public powers and castle-lordships in north-western of Romagna (centuries XI-XIII)
Creators: name: Pallotti, Riccardo <1982>
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2014
Subjects: M-STO/01 Storia medievale

description: La presente ricerca di dottorato consiste in un’analisi di carattere politico ed istituzionale dei poteri signorili e territoriali, collegati a distretti castrensi, documentati nella Romagna nord-occidentale durante il pieno medioevo. 
L’indagine mira a ricostruire, principalmente attraverso fonti documentarie, alcune delle quali inedite, la geografia dei poteri in un’area sub-regionale, con particolare attenzione al fenomeno della signoria rurale, dei poteri comitali e dell’incastellamento. Partendo dallo studio di una realtà locale, la ricerca arriva a sviluppare argomentazioni di carattere generale, ricollegandosi al dibattito storiografico sui poteri signorili e l’incastellamento. 
La ricerca risulta incentrata sui soggetti politici, laici ed ecclesiastici, detentori dei castelli e dei poteri pubblici nella Bassa Romagna, in primo luogo gli arcivescovi di Ravenna, i vescovi e i conti di Imola, le famiglie comitali di Cunio, Bagnacavallo e Donigallia nei secoli XI-XIII. 
L'attenzione si concentra, in particolare, sulla fase del cosiddetto “secondo incastellamento” e sui decenni a cavaliere tra XII e XIII secolo, con il tentativo di espansione dei comuni nel contado e la formalizzazione dei poteri dei signori rurali da parte dei sovrani svevi. 
Proprio alla complessa interazione con il mondo cittadino e allo stretto rapporto dei Cunio e dei Malvicini con la corte di Federico II viene dato ampio spazio nei capitoli conclusivi del presente lavoro.
description: The doctoral research entitled Pubblici poteri e signorie di castello nella Romagna nordoccidentale
fra XI e XIII secolo is a critical study about castle-lordships and their rise and growth from institutional, political and social point of view. This work examines local and feudal powers, castle-lordships and fortified settlements in Romagna between XI and XIII centuries, connecting with the historiographical debate about castle-holding aristocracy. 
It has specifically been taken into consideration north-western of Romagna, which was later conquered by Este family. This is a particular kind of area, without important towns but fully of castles and dominated by Ravenna, Faenza, Imola and, most of all, by Ravennate archbishop. This area has also long time influenced by byzantine rule. Thanks to his work, we can clearly understand that north-western Romagna is a lot more like to the remaining part of northern Italy of Longobard-French tradition.
The influence of quark energy loss on extracting nuclear sea quark distribution from nuclear Drell-Yan experimental data
Creators: name: Chun-Gui, Duan
name: Na, Liu
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: By means of two typical kinds of quark energy loss parametrization and the nuclear parton distributions determined only with lepton-nuclear deep inelastic scattering experimental data, a leading order analysis are performed on the proton-induced Drell-Yan differential cross section ratios of tungsten versus deuterium as a function of the quark momentum fraction in the beam proton and target nuclei. It is found that the theoretical results with quark energy loss are in good agreement with the experimental data. The quark energy loss effect produce approximately 3% to 11% suppression on the Drell-Yan differential cross section ratios $R_{W/D}$ in the range $0.05\leq x_2\leq0.3$. The application of nuclear Drell-Yan data with heavy targets is remarkably subject to difficulty in the constraints of the nuclear sea-quark distribution.
description: 10 pages, 2 figures