cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Non-canonical kinetic structures in the swampland
Creators: name: Solomon, Adam R.
name: Trodden, Mark
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We consider how the swampland criteria might be applied to models in which scalar fields have nontrivial kinetic terms, particularly in the context of $P(ϕ,X)$ theories, popularly used in approaches to inflation, to its alternatives, and to the problem of late-time cosmic acceleration. By embedding such theories in canonical multi-field models, from which the original theory emerges as a low-energy effective field theory, we derive swampland constraints, and study the circumstances under which these might be evaded while preserving cosmologically interesting phenomenology. We further demonstrate how these successes are tied to the phenomenon of turning in field space in the multi-field picture. We study both the general problem and specific examples of particular interest, such as DBI inflation.
description: 16+3 pages. v2: added references
Entstehung und Entwicklung der "Deutschen ev.-luth. Kirche in Lettland" bis 2003
Creators: name: Wittram, Heinrich
Publisher: name: Lutherische Kirche in der Welt
Year: 1970

description: Lutherische Kirche in der Welt, Bd. 52 (2005): Lutherische Kirche in der Welt, Band 52
Detailed and simplified non-equilibrium helium ionization in the solar atmosphere
Creators: name: Golding, Thomas Peter
name: Carlsson, Mats
name: Leenaarts, Jorrit
Publisher: name: arXiv
Year: 2014
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Helium ionization plays an important role in the energy balance of the upper chromosphere and transition region. Helium spectral lines are also often used as diagnostics of these regions. We carry out 1D radiation-hydrodynamics simulations of the solar atmosphere and find that the helium ionization is mostly set by photoionization and direct collisional ionization, counteracted by radiative recombination cascades. By introducing an additional recombination rate mimicking the recombination cascades, we construct a simplified 3 level helium model atom consisting of only the ground states. This model atom is suitable for modeling non-equilibrium helium ionization in 3D numerical models. We perform a brief investigation of the formation of the He I 10830 and He II 304 spectral lines. Both lines show non-equilibrium features that are not recovered with statistical equilibrium models, and caution should therefore be exercised when such models are used as a basis in the interpretation of observations.
description: 11 pages, 9 figures. Accepted for publication in ApJ
Modal Logics of Some Hereditarily Irresolvable Spaces
Creators: name: Goldblatt, Robert
Publisher: name: arXiv
Year: 2020
Subjects: subject: Logic (math.LO)
subject: FOS: Mathematics
subject: 03B45, 54F99

description: A topological space is \emph{hereditarily $k$-irresolvable} if none of its subspaces can be partitioned into $k$ dense subsets, We use this notion to provide a topological semantics for a sequence of modal logics whose $n$-th member K4$\mathbb{C}_n$ is characterised by validity in transitive Kripke frames of circumference at most $n$. We show that under the interpretation of the modality $\Diamond$ as the derived set (of limit points) operation, K4$\mathbb{C}_n$ is characterised by validity in all spaces that are hereditarily $n+1$-irresolvable and have the T$_D$ separation property. We also identify the extensions of K4$\mathbb{C}_n$ that result when the class of spaces involved is restricted to those that are weakly scattered, or crowded, or openly irresolvable, the latter meaning that every non-empty open subspace is 2-irresolvable. Finally we give a topological semantics for K4M, where M is the McKinsey axiom.
A search for pulsations in short gamma-ray bursts to constrain their progenitors
Creators: name: Dichiara, S.
name: Guidorzi, C.
name: Frontera, F.
name: Amati, L.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We searched for periodic and quasiperiodic signal in the prompt emission of a sample of 44 bright short gamma-ray bursts detected with Fermi/GBM, Swift/BAT, and CGRO/BATSE. The aim was to look for the observational signature of quasiperiodic jet precession which is expected from black hole-neutron star mergers, but not from double neutron star systems. Thus, this kind of search holds the key to identify the progenitor systems of short GRBs and, in the wait for gravitational wave detection, represents the only direct way to constrain the progenitors. We tailored our search to the nature of the expected signal by properly stretching the observed light curves by an increasing factor with time, after calibrating the technique on synthetic curves. In none of the GRBs of our sample we found evidence for periodic or quasiperiodic signals. In particular, for the 7 unambiguously short GRBs with best S/N we obtained significant upper limits to the amplitude of the possible oscillations. This result suggests that BH-NS systems do not dominate the population of short GRB progenitors as described by the kinematic model of Stone, Loeb, & Berger (2013).
description: 7 pages, 5 figures, accepted to ApJ, added references
Penetration of a cooling convective layer into a stably-stratified composition gradient: entrainment at low Prandtl number
Creators: name: Fuentes, J. R.
name: Cumming, A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We study the formation and evolution of a convective layer when a stably-stratified fluid with a composition gradient is cooled from above. We perform a series of 2D simulations using the Bousinessq approximation with Prandtl number ranging from Pr = 0.1 to 7, extending previous work on salty water to low Pr. We show that the evolution of the convection zone is well-described by an entrainment prescription in which a fixed fraction of the kinetic energy of convective motions is used to mix fluid at the interface with the stable layer. We measure the entrainment efficiency and find that it grows with decreasing Prandtl number or increased applied heat flux. The kinetic energy flux that determines the entrainment rate is a small fraction of the total convective luminosity. In this time-dependent situation, the density ratio at the interface is driven to a narrow range that depends on the value of Pr, and with low enough values that advection dominates the interfacial transport. We characterize the interfacial flux ratio and how it depends on the interface stability. We present an analytic model that accounts for the growth of the convective layer with two parameters, the entrainment efficiency and the interfacial heat transport, both of which can be measure from the simulations.
description: Published in Physical Review Fluids. The published version has some minor typos. We fixed them in this version
title: Bürger Volksvertreter!; [1849]
title: In dem Augenblick, wo die Anmaßung des Gottbegnadeten Hohenzoller das Äußerste gewagt, um die Würde und das Ehrgefühl einer freien Nation herauszufordern, drängt es uns, noch einen letzten Ruf an Euch zu richten, dieser Herausforderung als Männer zu begegenen. ... ; Hanau den 9. April 1849
titleType: Subtitle
Creators: name: (:Unav)
Publisher: name: Universitätsbibliothek der Ludwig-Maximilians-Universität München
Year: 2018

description: Kopftitel
Just Like the Real Thing: Fast Weak Simulation of Quantum Computation
Creators: name: Hillmich, Stefan
name: Markov, Igor L.
name: Wille, Robert
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum computers promise significant speedups in solving problems intractable for conventional computers but, despite recent progress, remain limited in scaling and availability. Therefore, quantum software and hardware development heavily rely on simulation that runs on conventional computers. Most such approaches perform strong simulation in that they explicitly compute amplitudes of quantum states. However, such information is not directly observable from a physical quantum computer because quantum measurements produce random samples from probability distributions defined by those amplitudes. In this work, we focus on weak simulation that aims to produce outputs which are statistically indistinguishable from those of error-free quantum computers. We develop algorithms for weak simulation based on quantum state representation in terms of decision diagrams. We compare them to using state-vector arrays and binary search on prefix sums to perform sampling. Empirical validation shows, for the first time, that this enables mimicking of physical quantum computers of significant scale.
description: 6 pages, 4 figures
Observation of particle pairing in a two-dimensional plasma crystal
Creators: name: Zhdanov, S. K.
name: Couëdel, L.
name: Nosenko, V.
name: Thomas, H. M.
name: Morfill, G. E.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The observation is presented of naturally occurring pairing of particles and their cooperative drift in a two-dimensional plasma crystal. A single layer of plastic microspheres was suspended in the plasma sheath of a capacitively coupled rf discharge in argon at a low pressure of 1 Pa. The particle dynamics were studied by combining the top-view and side-view imaging of the suspension. Cross analysis of the particle trajectories allowed us to identify naturally occurring metastable pairs of particles. The lifetime of pairs was long enough for their reliable identification.
description: 5 pages, 4 figures
Exploiting Quantum Teleportation in Quantum Circuit Mapping
Creators: name: Hillmich, Stefan
name: Zulehner, Alwin
name: Wille, Robert
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum computers are constantly growing in their number of qubits, but continue to suffer from restrictions such as the limited pairs of qubits that may interact with each other. Thus far, this problem is addressed by mapping and moving qubits to suitable positions for the interaction (known as quantum circuit mapping). However, this movement requires additional gates to be incorporated into the circuit, whose number should be kept as small as possible since each gate increases the likelihood of errors and decoherence. State-of-the-art mapping methods utilize swapping and bridging to move the qubits along the static paths of the coupling map---solving this problem without exploiting all means the quantum domain has to offer. In this paper, we propose to additionally exploit quantum teleportation as a possible complementary method. Quantum teleportation conceptually allows to move the state of a qubit over arbitrary long distances with constant overhead---providing the potential of determining cheaper mappings. The potential is demonstrated by a case study on the IBM Q Tokyo architecture which already shows promising improvements. With the emergence of larger quantum computing architectures, quantum teleportation will become more effective in generating cheaper mappings.
description: To appear in ASP-DAC 2021
As Accurate as Needed, as Efficient as Possible: Approximations in DD-based Quantum Circuit Simulation
Creators: name: Hillmich, Stefan
name: Kueng, Richard
name: Markov, Igor L.
name: Wille, Robert
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum computers promise to solve important problems faster than conventional computers. However, unleashing this power has been challenging. In particular, design automation runs into (1) the probabilistic nature of quantum computation and (2) exponential requirements for computational resources on non-quantum hardware. In quantum circuit simulation, Decision Diagrams (DDs) have previously shown to reduce the required memory in many important cases by exploiting redundancies in the quantum state. In this paper, we show that this reduction can be amplified by exploiting the probabilistic nature of quantum computers to achieve even more compact representations. Specifically, we propose two new DD-based simulation strategies that approximate the quantum states to attain more compact representations, while, at the same time, allowing the user to control the resulting degradation in accuracy. We also analytically prove the effect of multiple approximations on the attained accuracy and empirically show that the resulting simulation scheme enables speed-ups up to several orders of magnitudes.
description: 6 pages, 2 figures, to be published at Design, Automation, and Test in Europe 2021
Enhancing long-range order in disordered two-band s-wave superconductors
Creators: name: Caldas, Heron
name: Rufo, S.
name: Griffith, M. A. R.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We investigate the effects of disorder in a hybridized two-dimensional two-band s-wave superconductor model. The situation in which electronic orbitals form these bands with angular momentum such that the hybridization $V_{i,j}$ among them is antisymmetric, under inversion symmetry, was taken into account. The on-site disorder is given by a random impurity potential $W$. We find that while the random disorder acts to the detriment of superconductivity, hybridization proceeds favoring it. Accordingly, hybridization plays an important role in two-band models of superconductivity, in order to hold the long-range order against the increase of disorder. This makes the present model eligible to describe real materials, since the hybridization may be induced by pressure or doping. In addition, the regime from moderate to strong disorder, reveals that the system is broken into superconductor islands with correlated local order parameters. These correlations persist to distances of several order lattice spacing which corresponds to the size of the SC-Islands.
IC MAGE Model 10 - Mohr-Coulomb failure criterion with stress-dependent elastic stiffness and independent random parameter distributions
Creators: name: Taborda, DMG
name: Galtier, L
name: Kontoe, S
name: Tsiampousi, A
Publisher: name: Zenodo
Year: 2022
Subjects: Geotechnical Analysis
Finite Element Analysis
Constitutive Modelling
Geotechnical Engineering
Random Fields
Soil Variability

description: IC MAGE M10 is a user-defined model for PLAXIS built using the IC MAGE UMIP framework in which a stress-dependent elastic response is combined with a Mohr-Coulomb failure criterion. Both the stiffness parameters and the strength parameters are determined following independent random distributions.
Shear flows and their suppression at large aspect ratio. Two-dimensional simulations of a growing convection zone
Creators: name: Fuentes, J. R.
name: Cumming, A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: We investigate the onset and evolution of zonal flows in a growing convective layer when a stably-stratified fluid with a composition gradient is cooled from above. This configuration allows the study of zonal flows for a wide range of values of the Rayleigh number, $Ra$, and aspect ratio of the convection zone within a given simulation. We perform a series of 2D simulations using the Boussinesq approximation, with aspect ratio of the computational domain between $1$ and $5$, and Prandtl number $Pr = 0.1$, 0.5, 1, and $7$. We find that for square domains zonal flows appear when the aspect ratio of the convective layer is smaller than two, and the evolution of the system depends on the Prandtl number. For $Pr\leq 1$, the fluid experiences bursts of convective transport with negligible convective transport between bursts. The magnitude and frequency of the bursts are smaller at low $Pr$, which suggests that the bursting regime is stronger in a narrow range around $Pr=1$, as observed in previous studies of thermal convection. For $Pr=7$, the structure of the flow consists of tilted convective plumes, and the convective transport is sustained at all times. In wider domains, the aspect ratio of the convective zone is always much larger than two and zonal flows do not appear. These results confirm and extend to fluids with stable composition gradients previous findings on thermal convection. The fact that zonal flows can be avoided by using computational domains with large aspect ratios opens up the possibility of 2D studies of convective overshoot, layer formation and transport properties across diffusive interfaces.
description: Accepted for publication in Physical Review Fluids
Uncountably many minimal hereditary classes of graphs of unbounded clique-width
Creators: name: Brignall, Robert
name: Cocks, Daniel
Publisher: name: arXiv
Year: 2021
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics

description: Given an infinite word over the alphabet $\{0,1,2,3\}$, we define a class of bipartite hereditary graphs $\mathcal{G}^α$, and show that $\mathcal{G}^α$ has unbounded clique-width unless $α$ contains at most finitely many non-zero letters. We also show that $\mathcal{G}^α$ is minimal of unbounded clique-width if and only if $α$ belongs to a precisely defined collection of words $Γ$. The set $Γ$ includes all almost periodic words containing at least one non-zero letter, which both enables us to exhibit uncountably many pairwise distinct minimal classes of unbounded clique width, and also proves one direction of a conjecture due to Collins, Foniok, Korpelainen, Lozin and Zamaraev. Finally, we show that the other direction of the conjecture is false, since $Γ$ also contains words that are \emph{not} almost periodic.
Ladder Symmetries of Black Holes: Implications for Love Numbers and No-Hair Theorems
Creators: name: Hui, Lam
name: Joyce, Austin
name: Penco, Riccardo
name: Santoni, Luca
name: Solomon, Adam R.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: It is well known that asymptotically flat black holes in general relativity have a vanishing static, conservative tidal response. We show that this is a result of linearly realized symmetries governing static (spin 0,1,2) perturbations around black holes. The symmetries have a geometric origin: in the scalar case, they arise from the (E)AdS isometries of a dimensionally reduced black hole spacetime. Underlying the symmetries is a ladder structure which can be used to construct the full tower of solutions, and derive their general properties: (1) solutions that decay with radius spontaneously break the symmetries, and must diverge at the horizon; (2) solutions regular at the horizon respect the symmetries, and take the form of a finite polynomial that grows with radius. Taken together, these two properties imply that static response coefficients -- and in particular Love numbers -- vanish. Moreover, property (1) is consistent with the absence of black holes with linear (perturbative) hair. We also discuss the manifestation of these symmetries in the effective point particle description of a black hole, showing explicitly that for scalar probes the worldline couplings associated with a non-trivial tidal response and scalar hair must vanish in order for the symmetries to be preserved.
description: Some sentences rephrased for clarity. Equations and conclusions unchanged
Shrinkage Initialization for Smooth Learning of Neural Networks
Creators: name: Cheng, Miao
name: Zhou, Feiyan
name: Zou, Hongwei
name: Wang, Limin
Publisher: name: arXiv
Year: 2025
Subjects: subject: Machine Learning (cs.LG)
subject: Neural and Evolutionary Computing (cs.NE)
subject: FOS: Computer and information sciences
subject: I.2.6; F.2.1

description: The successes of intelligent systems have quite relied on the artificial learning of information, which lead to the broad applications of neural learning solutions. As a common sense, the training of neural networks can be largely improved by specifically defined initialization, neuron layers as well as the activation functions. Though there are sequential layer based initialization available, the generalized solution to initial stages is still desired. In this work, an improved approach to initialization of neural learning is presented, which adopts the shrinkage approach to initialize the transformation of each layer of networks. It can be universally adapted for the structures of any networks with random layers, while stable performance can be attained. Furthermore, the smooth learning of networks is adopted in this work, due to the diverse influence on neural learning. Experimental results on several artificial data sets demonstrate that, the proposed method is able to present robust results with the shrinkage initialization, and competent for smooth learning of neural networks.
description: 6 pages, 4 figures
Dynamical aspects of foliations with ample normal bundle
Creators: name: Adachi, Masanori
name: Brinkschulte, Judith
Publisher: name: arXiv
Year: 2021
Subjects: subject: Complex Variables (math.CV)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 32S65, 37F75

description: We prove the following result that was conjectured by Brunella: Let $X$ be a compact complex manifold of dimension $\geq 3$. Let $\mathcal{F}$ be a codimension one holomorphic foliation on $X$ with ample normal bundle. Then every leaf of $\mathcal{F}$ accumulates to the singular set of $\mathcal{F}$.
description: 13 pages, to appear in Indiana University Mathematics Journal, dedicated to Prof. Takeo Ohsawa on the occasion of his 70th birthday
Below-bandgap excitation of bulk semiconductors by twisted light
Creators: name: Quinteiro, G. F.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: I theoretically investigate the response of bulk semiconductors to excitation by twisted light below the energy bandgap. To this end, I modify a well-known model of light-semiconductor interaction to account for the conservation of the light's momentum. I show that the excited states can be thought of as a superposition of slightly perturbed exciton states undergoing a complex center-of-mass motion. In addition, the absorption would occur at a slightly shifted energy (compared to plane waves) and would exhibit complex spatial patterns in the polarization and current.
Historical Geodata in Central and Eastern Europe - introduction to discussion
Creators: name: Panecki, Tomasz
name: Słoń, Marek
name: Duży, Wiesława
name: Myrda, Grzegorz
name: Słomska-Przech, Katarzyna
name: Szady, Bogumił
Publisher: name: Zenodo
Year: 2020
Subjects: history
geography
ontology
Linked Open Data
historical GIS

description: Presentation for Introduction to discussion on opportunities, and obstacles in the harmonisation of historical spatial data using examples from Central and Eastern Europe. We will discuss data models and difficulties in linking datasets of historical data. Data disambiguation is also a part of the discussion. We will take a closer look at unique persistent identifiers, a necessity of creating international gazetteers, data interoperability, and accessibility.
The quantum switch is uniquely defined by its action on unitary operations
Creators: name: Dong, Qingxiuxiong
name: Quintino, Marco Túlio
name: Soeda, Akihito
name: Murao, Mio
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The quantum switch is a quantum process that creates a coherent control between different unitary operations, which is often described as a quantum process which transforms a pair of unitary operations $(U_1, U_2)$ into a controlled unitary operation that coherently applies them in different orders as ${\vert {0} \rangle\!\langle {0} \vert} \otimes U_1 U_2 + {\vert {1} \rangle\!\langle {1} \vert} \otimes U_2 U_1$. This description, however, does not directly define its action on non-unitary operations. The action of the quantum switch on non-unitary operations is then chosen to be a ``natural'' extension of its action on unitary operations. In general, the action of a process on non-unitary operations is not uniquely determined by its action on unitary operations. It may be that there could be a set of inequivalent extensions of the quantum switch for non-unitary operations. We prove, however, that the natural extension is the only possibility for the quantum switch for the 2-slot case. In other words, contrary to the general case, the action of the quantum switch on non-unitary operations (as a linear and completely CP preserving supermap) is completely determined by its action on unitary operations. We also discuss the general problem of when the complete description of a quantum process is uniquely determined by its action on unitary operations and identify a set of single-slot processes which are completely defined by their action on unitary operations.
description: 24 pages, 2 figures. Typos corrected, published version
Ion-size effects on cuprate High Temperature Superconductors
Creators: name: Mallett, Benjamin P P
Publisher: name: arXiv
Year: 2013
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: There are two general ways to compress the cuprates, by external pressure or by internal pressure as induced by isovalent-ion substitution. Paradoxically, they have the opposite effect on the superconducting transition temperature. This thesis seeks to understand the salient difference between these two pressures. We study three families of cuprates where the ion size can be systematically altered; Bi$_2$(Sr$_{1.6-x}$A$_x$)Ln$_{0.4}$CuO$_{6+ δ}$, ACuO$_2 $ and LnBa$_{2-x} $Sr$_x $Cu$_3 $O$_{7-δ} $ where Ln is a Lanthenide or Y and A=\{Mg,Ca,Sr,Ba\}. We use a variety of techniques to explore our paradox, for example; Raman spectroscopy to measure the antiferromagnetic exchange energy and energy gaps, Density Functional Theory to calculate the density of states, Muon Spin Relaxation to measure the superfluid density as well as a variety of more conventional techniques to synthesize and characterise our samples. Our Raman studies show that an energy scale for spin fluctuations cannot resolve the different effects of the two pressures. Similarly the density of states, while an important property, does not clearly resolve the paradox. Our superfluid density measurements show that the disorder resulting from isovalent-ion substitution is secondary in importance for the superconducting transition temperature. Instead, we find that the polarisability is a key property of the cuprates with regard to superconductivity. This understanding resolves the paradox! It implies that electron pairing results from either (i) a short-range interaction where the polarisability screens repulsive longer-range interactions and/or (ii) the relatively unexplored idea of the exchange of quantized, coherent polarisation waves. More generally, we have also demonstrated the utility of studying ion-size effects to further our collective understanding of the cuprates.
description: PhD thesis. 238 pages, 79 figures
Computable Stone spaces
Creators: name: Bazhenov, Nikolay
name: Harrison-Trainor, Matthew
name: Melnikov, Alexander
Publisher: name: arXiv
Year: 2021
Subjects: subject: Logic (math.LO)
subject: FOS: Mathematics
subject: 03D78, 03D80, 03C57

description: We investigate computable metrizability of Polish spaces up to homeomorphism. In this paper we focus on Stone spaces. We use Stone duality to construct the first known example of a computable topological Polish space not homeomorphic to any computably metrized space. In fact, in our proof we construct a right-c.e. metrized Stone space which is not homeomorphic to any computably metrized space. Then we introduce a new notion of effective categoricity for effectively compact spaces and prove that effectively categorical Stone spaces are exactly the duals of computably categorical Boolean algebras. Finally, we prove that, for a Stone space $X$, the Banach space $C(X;\mathbb{R})$ has a computable presentation if, and only if, $X$ is homeomorphic to a computably metrized space. This gives an unexpected positive partial answer to a question recently posed by McNicholl.
description: 18 pages
PoetryLab as Infrastructure for the Analysis of Spanish Poetry
Creators: name: De La Rosa, Javier
name: Pérez Pozo, Álvaro
name: Hernández, Laura
name: Díaz, Aitor
name: Ros, Salvador
name: González-Blanco, Elena
Publisher: name: Zenodo
Year: 2020
Subjects: Digital Humanities, Natural Language Processing, Poetry

description: The development of the network of ontologies of the ERC POSTDATA Project brought to light some deficiencies in terms of completeness in the existing corpora. To tackle the issue in the realm of the Spanish poetic tradition, our approach consisted in designing a set of tools that any scholar could use to automatically enrich the analysis of Spanish poetry. The effort crystallized in the PoetryLab, an extensible open-source toolkit for syllabification, scansion, enjambment detection, rhyme detection, and historical named entity recognition for Spanish poetry. We designed the system to be interoperable, compliant with the project ontologies, easy to use by tech-savvy and non-expert researchers, and requiring minimal maintenance and setup. Furthermore, we propose the integration of the PoetryLab as a core functionality in the tool catalog of CLARIN for Spanish poetry.
Medical Profile Model: Scientific and Practical Applications in Healthcare
Creators: name: Blinov, Pavel
name: Kokh, Vladimir
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computers and Society (cs.CY)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: The paper researches the problem of representation learning for electronic health records. We present the patient histories as temporal sequences of diseases for which embeddings are learned in an unsupervised setup with a transformer-based neural network model. Additionally the embedding space includes demographic parameters which allow the creation of generalized patient profiles and successful transfer of medical knowledge to other domains. The training of such a medical profile model has been performed on a dataset of more than one million patients. Detailed model analysis and its comparison with the state-of-the-art method show its clear advantage in the diagnosis prediction task. Further, we show two applications based on the developed profile model. First, a novel Harbinger Disease Discovery method allowing to reveal disease associated hypotheses and potentially are beneficial in the design of epidemiological studies. Second, the patient embeddings extracted from the profile model applied to the insurance scoring task allow significant improvement in the performance metrics.
description: 8 pages, code available at https://github.com/sberbank-ai-lab/mimic.profile, accepted for publication at IEEE JBHI
Higher-order motif analysis in hypergraphs
Creators: name: Lotito, Quintino Francesco
name: Musciotto, Federico
name: Montresor, Alberto
name: Battiston, Federico
Publisher: name: arXiv
Year: 2021
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Data Structures and Algorithms (cs.DS)
subject: Social and Information Networks (cs.SI)
subject: Methodology (stat.ME)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: A deluge of new data on social, technological and biological networked systems suggests that a large number of interactions among system units are not limited to pairs, but rather involve a higher number of nodes. To properly encode such higher-order interactions, richer mathematical frameworks such as hypergraphs are needed, where hyperlinks describe connections among an arbitrary number of nodes. Here we introduce the concept of higher-order motifs, small connected subgraphs where vertices may be linked by interactions of any order. We provide lower and upper bounds on the number of higher-order motifs as a function of the motif size, and propose an efficient algorithm to extract complete higher-order motif profiles from empirical data. We identify different families of hypergraphs, characterized by distinct higher-order connectivity patterns at the local scale. We also capture evidences of structural reinforcement, a mechanism that associates higher strengths of higher-order interactions for the nodes that interact more at the pairwise level. Our work highlights the informative power of higher-order motifs, providing a first way to extract higher-order fingerprints in hypergraphs at the network microscale.
description: pre-submission version, 10 pages and 5 figures + SI
Graded dimensions and monomial bases for the cyclotomic quiver Hecke algebras
Creators: name: Hu, Jun
name: Shi, Lei
Publisher: name: arXiv
Year: 2021
Subjects: subject: Representation Theory (math.RT)
subject: FOS: Mathematics

description: In this paper we give a closed formula for the graded dimension of the cyclotomic quiver Hecke algebra $R^Λ(β)$ associated to an {\it arbitrary} symmetrizable Cartan matrix $A=(a_{ij})_{i,j}\in I$, where $Λ\in P^+$ and $β\in Q_n^+$. As applications, we obtain some {\it necessary and sufficient conditions} for the KLR idempotent $e(ν)$ (for any $ν\in I^β$) to be nonzero in the cyclotomic quiver Hecke algebra $R^Λ(β)$. We prove several level reduction results which decomposes $\dim R^Λ(β)$ into a sum of some products of $\dim R^{Λ^i}(β_i)$ with $Λ=\sum_iΛ^i$ and $β=\sum_{i}β_i$, where $Λ^i\in P^+, β^i\in Q^+$ for each $i$. We construct some explicit monomial bases for the subspaces $e(\widetildeν)R^Λ(β)e(μ)$ and $e(\widetildeν)R^Λ(β)e(μ)$ of $R^Λ(β)$, where $μ\in I^β$ is {\it arbitrary} and $\widetildeν\in I^β$ is a certain specific $n$-tuple (see Section 4).Finally, we use our graded dimension formulae to provide some examples which show that $R^Λ(n)$ is in general not graded free over its natural embedded subalgebra $R^Λ(m)$ with $m
description: To appear in Communications in Contemporary Mathematics
Keller admissible triples and Duflo theorem
Creators: name: Liao, Hsuan-Yi
name: Seol, Seokbong
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Algebra (math.QA)
subject: Mathematical Physics (math-ph)
subject: Algebraic Topology (math.AT)
subject: Rings and Algebras (math.RA)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: The present paper is devoted to the study of Keller admissible triples. We prove that a Keller admissible triple induces an isomorphism of Gerstenhaber algebras between the Hochschild cohomologies of direct-sum type of the pair of differential graded algebras bound to one another by the admissible triple. As an application, we give a new concrete proof of the Duflo--Kontsevich theorem for finite-dimensional Lie algebras.
description: 37 pages. Updated references. Fix typos. To appear in Journal de Math\'ematiques Pures et Appliqu\'ees
Rhetorical Change in the Chinese Diplomatic Discourse: Evidence from the Ministry of Foreign Affairs Press Conference Transcripts
Creators: name: Lin, Qiaohui
Publisher: name: University of Chicago
Year: 2023
Subjects: subject: China foreign politics
subject: Chinese foreign policy
subject: China's diplomacy
subject: China's Ministry of Foreign Affairs
subject: Text as data

description: Debates about whether China’s diplomacy has become more assertive have been circulating in academics and policy realms since 2010. Xi’s presidency and the recent Wolf Warrior Diplomacy have raised more concern about the increasing assertiveness in China’s foreign diplomacy regarding its combative and hostile language. However, there has been relatively little effort to systemically examine the timing of the assertive rhetorical change in China’s diplomatic discourse and how assertive China’s diplomatic approach is. This thesis offers a measurable approach to studying China’s assertiveness using the Chinese Ministry of Foreign Affairs press conference transcripts between 2002 and 2022. I employ sentiment analysis and unsupervised topic modeling to provide a measurable approach and a large-scale empirical analysis of diplomats’ speeches. I show that the language of transcripts has become more negative and assertive starting in Xi’s second term of presidency (2018 onward). I also show that the increased assertiveness has been associated with what the Party considers “core interests” and Sino-U.S. relations.
K-Lane: Lidar Lane Dataset and Benchmark for Urban Roads and Highways
Creators: name: Paek, Donghee
name: Kong, Seung-Hyun
name: Wijaya, Kevin Tirta
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Artificial Intelligence (cs.AI)
subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Lane detection is a critical function for autonomous driving. With the recent development of deep learning and the publication of camera lane datasets and benchmarks, camera lane detection networks (CLDNs) have been remarkably developed. Unfortunately, CLDNs rely on camera images which are often distorted near the vanishing line and prone to poor lighting condition. This is in contrast with Lidar lane detection networks (LLDNs), which can directly extract the lane lines on the bird's eye view (BEV) for motion planning and operate robustly under various lighting conditions. However, LLDNs have not been actively studied, mostly due to the absence of large public lidar lane datasets. In this paper, we introduce KAIST-Lane (K-Lane), the world's first and the largest public urban road and highway lane dataset for Lidar. K-Lane has more than 15K frames and contains annotations of up to six lanes under various road and traffic conditions, e.g., occluded roads of multiple occlusion levels, roads at day and night times, merging (converging and diverging) and curved lanes. We also provide baseline networks we term Lidar lane detection networks utilizing global feature correlator (LLDN-GFC). LLDN-GFC exploits the spatial characteristics of lane lines on the point cloud, which are sparse, thin, and stretched along the entire ground plane of the point cloud. From experimental results, LLDN-GFC achieves the state-of-the-art performance with an F1- score of 82.1%, on the K-Lane. Moreover, LLDN-GFC shows strong performance under various lighting conditions, which is unlike CLDNs, and also robust even in the case of severe occlusions, unlike LLDNs using the conventional CNN. The K-Lane, LLDN-GFC training code, pre-trained models, and complete development kits including evaluation, visualization and annotation tools are available at https://github.com/kaist-avelab/k-lane.
description: 20 pages, 20 figures, 11 tables
A Modified Gas-Kinetic Scheme for Turbulent Flow
Creators: name: Righi, Marcello
Publisher: name: arXiv
Year: 2013
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: By analogy with the kinetic theory of gases, most turbulence modeling strate- gies rely on an eddy viscosity to model the unresolved turbulent fluctuations. How- ever, the ratio of unresolved to resolved scales - very much like a degree of rarefaction - is not taken into account by the popular conventional schemes, based on the Navier- Stokes equations. This paper investigates the simulation of turbulent flow with a gas- kinetic scheme. In so doing, the modeling of turbulence becomes part of the numerical scheme: the degree of rarefaction is automatically taken into account; the turbulent stress tensor is not constrained into a linear relation with the strain rate. Instead it is modeled on the basis of the analogy between particles and eddies, without any as- sumptions on the type of turbulence or flow class. The implementation of a turbulent gas-kinetic scheme into a finite-volume solver is put forward, with turbulent kinetic energy and dissipation supplied by an allied turbulence model. A number of flow cases, challenging for conventional RANS methods, are investigated; results show that the shock-turbulent boundary layer is captured in a much more convincing way by the gas-kinetic scheme.
description: 24 pages, 13 figures, 3 tables. arXiv admin note: substantial text overlap with arXiv:1302.2132
A Demonstration of Wavefront Sensing and Mirror Phasing from the Image Domain
Creators: name: Pope, Benjamin
name: Cvetojevic, Nick
name: Cheetham, Anthony
name: Martinache, Frantz
name: Norris, Barnaby
name: Tuthill, Peter
Publisher: name: arXiv
Year: 2014
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: In astronomy and microscopy, distortions in the wavefront affect the dynamic range of a high contrast imaging system. These aberrations are either imposed by a turbulent medium such as the atmosphere, by static or thermal aberrations in the optical path, or by imperfectly phased subapertures in a segmented mirror. Active and adaptive optics (AO), consisting of a wavefront sensor and a deformable mirror, are employed to address this problem. Nevertheless, the non-common-path between the wavefront sensor and the science camera leads to persistent quasi-static speckles that are difficult to calibrate and which impose a floor on the image contrast. In this paper we present the first experimental demonstration of a novel wavefront sensor requiring only a minor asymmetric obscuration of the pupil, using the science camera itself to detect high order wavefront errors from the speckle pattern produced. We apply this to correct errors imposed on a deformable microelectromechanical (MEMS) segmented mirror in a closed loop, restoring a high quality point spread function (PSF) and residual wavefront errors of order $\sim 10$ nm using 1600 nm light, from a starting point of $\sim 300$ nm in piston and $\sim 0.3$ mrad in tip-tilt. We recommend this as a method for measuring the non-common-path error in AO-equipped ground based telescopes, as well as as an approach to phasing difficult segmented mirrors such as on the \emph{James Webb Space Telescope} primary and as a future direction for extreme adaptive optics.
description: 9 pages, 6 figures
Electronic transitions in quantum dots and rings induced by inhomogeneous off-centered light beams
Creators: name: Quinteiro, G. F.
name: Lucero, A. O.
name: Tamborenea, P. I.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We theoretically investigate the effect of inhomogeneous light beams with (twisted light) and without (plane-wave light) orbital angular momentum on semiconductor-based nanostructures, when the symmetry axes of the beam and the nanostructure are displaced parallel to each other. Exact analytical results are obtained by expanding the off-centered light field in terms of the appropriate light modes centered around the nanostructure. We demonstrate how electronic transitions involving the transfer of different amounts of orbital angular momentum are switched on and off as a function of the separation between the axes of the beam and the system. In particular, we show that even off-centered plane-wave beams induce transitions such that the angular momenta of the initial and final states are different.
Sheaves of low rank in three dimensional projective space
Creators: name: Schmidt, Benjamin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14J60 (Primary), 14D20, 14F06, 14F08 (Secondary)

description: We classify Chern characters of semistable sheaves up to rank four in three dimensional projective space. As a corollary we show that moduli spaces of semistable sheaves between rank zero and four with maximal third Chern character are smooth and irreducible.
description: 53 pages
Hierarchical Text Classification As Sub-Hierarchy Sequence Generation
Creators: name: Im, SangHun
name: Kim, Gibaeg
name: Oh, Heung-Seon
name: Jo, Seongung
name: Kim, Donghwan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computation and Language (cs.CL)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Hierarchical text classification (HTC) is essential for various real applications. However, HTC models are challenging to develop because they often require processing a large volume of documents and labels with hierarchical taxonomy. Recent HTC models based on deep learning have attempted to incorporate hierarchy information into a model structure. Consequently, these models are challenging to implement when the model parameters increase for a large-scale hierarchy because the model structure depends on the hierarchy size. To solve this problem, we formulate HTC as a sub-hierarchy sequence generation to incorporate hierarchy information into a target label sequence instead of the model structure. Subsequently, we propose the Hierarchy DECoder (HiDEC), which decodes a text sequence into a sub-hierarchy sequence using recursive hierarchy decoding, classifying all parents at the same level into children at once. In addition, HiDEC is trained to use hierarchical path information from a root to each leaf in a sub-hierarchy composed of the labels of a target document via an attention mechanism and hierarchy-aware masking. HiDEC achieved state-of-the-art performance with significantly fewer model parameters than existing models on benchmark datasets, such as RCV1-v2, NYT, and EURLEX57K.
description: 9 pages, 5 figures, Published at AAAI23
Empirical likelihood for the analysis of experimental designs
Creators: name: Kim, Eunseop
name: MacEachern, Steven N.
name: Peruggia, Mario
Publisher: name: arXiv
Year: 2021
Subjects: subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences

description: Empirical likelihood enables a nonparametric, likelihood-driven style of inference without restrictive assumptions routinely made in parametric models. We develop a framework for applying empirical likelihood to the analysis of experimental designs, addressing issues that arise from blocking and multiple hypothesis testing. In addition to popular designs such as balanced incomplete block designs, our approach allows for highly unbalanced, incomplete block designs. We derive an asymptotic multivariate chi-square distribution for a set of empirical likelihood test statistics and propose two single-step multiple testing procedures: asymptotic Monte Carlo and nonparametric bootstrap. Both procedures asymptotically control the generalised family-wise error rate and efficiently construct simultaneous confidence intervals for comparisons of interest without explicitly considering the underlying covariance structure. A simulation study demonstrates that the performance of the procedures is robust to violations of standard assumptions of linear mixed models. We also present an application to experiments on a pesticide.