cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Scant evidence for thawing quintessence
Creators: name: Wolf, William J.
name: García-García, Carlos
name: Bartlett, Deaglan J.
name: Ferreira, Pedro G.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: New constraints on the expansion rate of the Universe seem to favor evolving dark energy in the form of thawing quintessence models, i.e., models for which a canonical, minimally coupled scalar field has, at late times, begun to evolve away from potential energy domination. We scrutinize the evidence for thawing quintessence by exploring what it predicts for the equation of state. We show that, in terms of the usual Chevalier-Polarski-Linder parameters, ($w_0$, $w_a$), thawing quintessence is, in fact, only marginally consistent with a compilation of the current data. Despite this, we embrace the possibility that thawing quintessence is dark energy and find constraints on the microphysics of this scenario. We do so in terms of the effective mass $m^2$ and energy scale $V_0$ of the scalar field potential. We are particularly careful to enforce un-informative, flat priors on these parameters so as to minimize their effect on the final posteriors. While the current data favors a large and negative value of $m^2$, when we compare these models to the standard $Λ$CDM model we find that there is scant evidence for thawing quintessence.
description: Updated to match published PRD version
e-Highway 2050 WP4 : European transmission grid modular development plan from 2020 to 2050
Creators: name: Pestana, Rui
name: Gronau, Markus
name: Jankowski, Robert
name: Wilk, Maciej
name: Haller, Mathias
name: Centeno, Pablo
name: Petrescu
name: Ziółek, Pawel
name: Małecki, Marcin
name: Setreus, Johan
name: Elkington, Katherine
name: Máslo
name: Warichet, Jacques
name: Strotmann, Christian
name: Machado, Nélio
name: Carlini, Enrico
name: Moroni, Silvia
name: Vrana, Til Kristian
name: Bhavanam, Yaminidhar
name: Taylor, Gareth
name: Alikhanzadeh, Amir
name: Partidario, Maria
name: Soares, Rita
name: Philips, Peter
name: Monteiro, Margarida
name: Oliveira, Nuno
name: Forrest, Steven
name: Brooks, Katya
name: Sheate, William
name: Dusch, Arnaud
name: Strunz, Kai
name: Grisey, Nathalie
Publisher: name: Zenodo
Year: 2015
Subjects: transmission grid
TSO
grid planning
europe
electricity
TYNDP
scenarios
2050
environmental analysis

description: The e-Highway 2050 project aimed at delivering a top-down methodology to support the planning of the European power grid from 2020 to 2050. Within this project, the goal of WP4 was 1) to filter out candidate grid architecture options which cannot meet network reliability or environmental constraints and 2) to deliver a modular development plan from 2020 to 2050 of the Pan-European Transmission grid. D4.1 assesses the e-Highway 2050 scenarios regarding the following phenomena : Short circuit current levels, Voltage drop, Short-term frequency stability, Small signal stability. D4.2 presents the methodology, assessment framework of the Strategic Environmental and Sustainability Assessment and its
 application to e-Highway2050’s strategic options for 2050. D4.3 proposes energy scenarios and intermediate grid architectures for the year 2040. It aims to an efficient implementation of grid reinforcements between 2030 and 2050, thus forming the modular development plan between these decades D4.4 presents the main findings of the e-Highway2050 project regarding the expected scenarios and the grid reinforcement for 2040 and 2050 (summarizing deliverables 2.1, 2.3 and 4.3) and compares them to available datasets from today to 2030. The full data set of generation and transmission capacities at country and cluster level from 2030 to 2050 for the five considered scenarios is provided in an excel file.
Quantum and thermal fluctuations in bosonic Josephson junctions
Creators: name: Julia-Diaz, Bruno
name: Gottlieb, Alex D.
name: Martorell, Joan
name: Polls, Artur
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We use the Bose-Hubbard Hamiltonian to study quantum fluctuations in canonical equilibrium ensembles of bosonic Josephson junctions at relatively high temperatures, comparing the results for finite particle numbers to the classical limit that is attained as $N$ approaches infinity. We consider both attractive and repulsive atom-atom interactions, with especial focus on the behavior near the T=0 quantum phase transition that occurs, for large enough $N$, when attractive interactions surpass a critical level. Differences between Bose-Hubbard results for small $N$ and those of the classical limit are quite small even when $N \sim 100$, with deviations from the limit diminishing as 1/N.
Mellin amplitudes for $AdS_3 \times S^3$
Creators: name: Behan, Connor
name: Pitombo, Rodrigo S.
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: There are holographic superconformal theories in all dimensions between two and six which allow arbitrary tree-level four-point functions to be fixed by basic consistency conditions. Although Mellin space is usually the most efficient setting for imposing these contraints, four-point functions in two dimensions have thus far been an exception due to their more intricate dependence on the conformal cross-ratios. In this paper, we introduce a simple fix which exploits the relation between a parity-odd conformal block in two dimensions and a parity-even conformal block in four dimensions. We then apply the resulting toolkit to a study of the paradigmatic holographic theory in two dimensions which is the D1-D5 CFT. For correlators involving Kaluza-Klein modes of the tensor multiplet, this analysis reproduces results which were previously obtained using hidden conformal symmetry. With four Kaluza-Klein modes of the graviton multiplet, it yields new results including a compact formula for the correlators of all pairwise identical operators,
description: 30 + 19 pages, 3 figures. Fixed typos in graviton amplitudes
Difference Equations: from Berry Connections to the Coulomb Branch
Creators: name: Ferrari, Andrea E. V.
name: Zhang, Daniel
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Algebraic Geometry (math.AG)
subject: Differential Geometry (math.DG)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: In recent work, we demonstrated that a spectral variety for the Berry connection of a 2d $\mathcal{N}=(2,2)$ GLSM with Kähler vacuum moduli space $X$ and abelian flavour symmetry is the support of a sheaf induced by a certain action on the equivariant quantum cohomology of $X$. This action could be quantised to first-order matrix difference equations obeyed by brane amplitudes, and by taking the conformal limit, vortex partition functions. In this article, we elucidate how some of these results may be recovered from a 3d perspective, by placing the 2d theory at a boundary and gauging the flavour symmetry via a bulk A-twisted 3d $\mathcal{N}=4$ gauge theory (a sandwich construction). We interpret the above action as that of the bulk Coulomb branch algebra on boundary twisted chiral operators. This relates our work to recent constructions of actions of Coulomb branch algebras on quantum equivariant cohomology, providing a novel correspondence between these actions and spectral data of generalised periodic monopoles. The effective IR description of the 2d theory in terms of a twisted superpotential allows for explicit computations of these actions, which we demonstrate for abelian GLSMs.
description: 25 pages, 2 figures. v2: minor edits, to be published in SciPost Physics
Hinge Moments
Creators: name: Rassieur, William Theodore
Publisher: name: California Institute of Technology
Year: 1934
Subjects: Aeronautics

description: The matter herein presented represents the results of an investigation on hinge moments of ailerons on a 1/12.5 scale model of a main wing airfoil of the XP3D-l Navy Patrol Boat.

The data obtained were then employed in the calculation of stick forces due to aileron moments on the full scale airplane, the calculations covering a flying range of eighty to one hundred eighty miles per hour.
Some geometric relations for equipotential curves
Creators: name: Zhou, Yajun
Publisher: name: arXiv
Year: 2019
Subjects: subject: Differential Geometry (math.DG)
subject: Mathematical Physics (math-ph)
subject: Analysis of PDEs (math.AP)
subject: Probability (math.PR)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: Let $U(\boldsymbol r),\boldsymbol r\inΩ\subset \mathbb R^2$ be a harmonic function that solves an exterior Dirichlet problem. If all the level sets of $U(\boldsymbol r),\boldsymbol r\inΩ$ are smooth Jordan curves, then there are several geometric inequalities that correlate the curvature $κ(\boldsymbol r) $ with the magnitude of gradient $ |\nabla U(\boldsymbol r)|$ on each level set ("equipotential curve"). One of such inequalities is $ \langle [κ(\boldsymbol r)-\langleκ(\boldsymbol r)\rangle][|\nabla U(\boldsymbol r)|-\langle |\nabla U(\boldsymbol r)|\rangle]\rangle\geq0$, where $ \langle \cdot\rangle$ denotes average over a level set, weighted by the arc length of the Jordan curve. We prove such a geometric inequality by constructing an entropy for each level set $U(\boldsymbol r)=φ$, and showing that such an entropy is convex in $φ$. The geometric inequality for $κ(\boldsymbol r) $ and $ |\nabla U(\boldsymbol r)|$ then follows from the convexity and monotonicity of our entropy formula. A few other geometric relations for equipotential curves are also built on a convexity argument.
description: (v1) 12 pages, 1 TikZ figure; (v2) 14 pages, 1 TikZ figure. New results added. Typos corrected; (v3) 14 pages, 1 table, 1 TikZ figure. Revised according to reviewer's comments
Cohomology Groups of Deformations of Line Bundles on Complex Tori
Creators: name: Ben-Bassat, O.
name: Solomon, N.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Quantum Algebra (math.QA)
subject: High Energy Physics - Theory (hep-th)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 14A22, 53D55, 14A20, 58B34

description: The cohomology groups of line bundles over complex tori (or abelian varieties) are classically studied invariants of these spaces. In this article, we compute the cohomology groups of line bundles over various holomorphic, non-commutative deformations of complex tori. Our analysis interpolates between two extreme cases. The first case is a calculation of the space of (cohomological) theta functions for line bundles over constant, commutative deformations. The second case is a calculation of the cohomologies of non-commutative deformations of degree-zero line bundles.
description: 24 pages, exposition improved, typos fixed
title: Die Weihnachtskrippe der italienischen Militärinternierten im Kriegsgefangenenlager Wietzendorf 1944
title: Il presepe di Wietzendorf
titleType: AlternativeTitle
Creators: name: Lütjen, Andreas
Publisher: name: Soltau : Mundschenk
Year: 2022
Subjects: subject: Wietzendorf
subject: Weltkrieg <1939-1945>
subject: Italienischer Kriegsgefangener
subject: Kriegsgefangenschaft
subject: Krippe
subject: Dewey Decimal Classification::200 | Religion, Religionsphilosophie
subject: Dewey Decimal Classification::700 | Künste, Bildende Kunst allgemein
subject: Dewey Decimal Classification::900 | Geschichte und Geografie

description: In den letzten Jahren erschien über die Geschichte der italienischen Militärinternierten, die ab 1943 in deutsche Gefangenschaft gerieten, eine nicht geringe Anzahl an italienischsprachigen Veröffentlichungen, darunter auch Zeitzeugenberichte, die über die Zustände im Lager Wietzendorf (Oflag 83) während des Zweiten Weltkriegs Auskunft geben. So berichtete der italienische Leutnant der Artillerie Tullio Battaglia (†1999) in dem 2008 in Mailand erschienenen Buch von Luca Frigerio „Noi Nei Lager. Testimonianze di militari italiani internati nei campi nazisti (1943–1945)" über die 1944 entstandene Weihnachtskrippe der italienischen Militärinternierten im Lager Wietzendorf.
Evolution of the temporal and the spectral properties in 2010 and 2011 outbursts of H 1743-322
Creators: name: Debnath, Dipak
name: Chakrabarti, Sandip K.
name: Nandi, Anuj
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The Galactic black hole candidate H~1743-322 exhibited two X-ray outbursts in rapid succession: one in August 2010 and the other in April 2011. We analyze archival data of this object from the PCA instrument on board RXTE (2-25 keV energy band) to study the evolution of its temporal and spectral characteristics during both the outbursts, and hence to understand the behavioral change of the accretion flow dynamics associated with the evolution of the various X-ray features. We study the evolution of QPO frequencies during the rising and the declining phases of both the outbursts. We successfully fit the variation of QPO frequency using the Propagating Oscillatory Shock (POS) model in each of the outbursts and obtain the accretion flow parameters such as the instantaneous shock locations, the shock velocity and the shock strength. Based on the degree of importance of the thermal (disk black body) and the non-thermal (power-law) components of the spectral fit and properties of the QPO (if present), the entire profiles of the 2010 and 2011 outbursts are subdivided into four different spectral states: hard, hard-intermediate, soft-intermediate and soft. We attempt to explain the nature of the outburst profile (i.e., hardness-intensity diagram) with two different types of mass accretion flow.
description: 11 pages, 7 figures, 2 tables; Accepted in Peer-Reviewed Journal "Advances in Space Research"
Investigation of Turbulence in Circular Tubes by Means of a Hot-Wire Anemometer
Creators: name: Goldstein, Julian Richard
Publisher: name: California Institute of Technology
Year: 1934
Subjects: Aeronautics

description: It is the purpose of this paper to present the results of some investigation of turbulent flow in straight circular tubes, conducted at the suggestion of Dr. Th. Von Karman, and to give a detailed description of the method of using the hot-wire anemometer to measure fluctuations of the air velocity in a direction parallel to the mean flow.
Tooth flank approximation with root point iteration – potentials and limits in gear metrology
Creators: name: Fischer, Andreas
name: Von Freyberg, Axel
name: Stöbener, Dirk
Publisher: name: Elsevier Science
Year: 2021
Subjects: subject: Gear
subject: Metrology
subject: Reverse engineering
subject: 600

description: Gear production demands high-precision metrology, for which a holistic evaluation approach of the geometric data is proposed to overcome current restrictions. The holistic approximation with integrated partitioning and iterative root point calculation can cope even with modified flanks and is validated for gear parameter estimation with systematic deviations <0.2 µm. Apart from low signal-to-noise-ratio cases, where the approximation suffers from the multidimensionality of the optimization, the accuracy of standard evaluation procedures is achieved. Furthermore, holistic approximation is able to perform the required mathematical separation of the integral geometric elements of a tooth flank automatically when determining unknown gear parameters.
On Gaussian Random Supergravity
Creators: name: Bachlechner, Thomas C.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the distribution of metastable vacua and the likelihood of slow roll inflation in high dimensional random landscapes. We consider two examples of landscapes: a Gaussian random potential and an effective supergravity potential defined via a Gaussian random superpotential and a trivial Kähler potential. To examine these landscapes we introduce a random matrix model that describes the correlations between various derivatives and we propose an efficient algorithm that allows for a numerical study of high dimensional random fields. Using these novel tools, we find that the vast majority of metastable critical points in $N$ dimensional random supergravities are either approximately supersymmetric with $|F|\ll M_{\text{susy}}$ or supersymmetric. Such approximately supersymmetric points are dynamical attractors in the landscape and the probability that a randomly chosen critical point is metastable scales as $\log(P)\propto -N$. We argue that random supergravities lead to potentially interesting inflationary dynamics.
description: 36 pages, 9 figures
title: Messung thermomechanischer Beanspruchungen in laufenden Schleifprozessen
title: Measurement of thermomechanical loads in running grinding processes
titleType: AlternativeTitle
Creators: name: Tausendfreund, Andreas
name: Stöbener, Dirk
name: Fischer, Andreas
Publisher: name: De Gruyter Oldenbourg
Year: 2019
Subjects: subject: In-Prozess-Messung
subject: Speckle-Fotografie
subject: Schleifprozess
subject: Verformungs- und Dehnungsmessung
subject: 600

description: Die Kenntnis der zum Beispiel während des Schleifprozesses auftretenden thermomechanischen Werkstückbeanspruchungen und der im Material verbleibenden Veränderungen lässt sich gemäß dem Konzept der Prozesssignaturen nutzen, um den Fertigungsprozess zu optimieren und mit anderen zu vergleichen (z. B. mit der Laserbearbeitung). Voraussetzung für die Erstellung einer Prozesssignatur ist, dass die Beanspruchungen während des laufenden Prozesses charakterisiert werden können. Aufgrund der rauen Prozessbedingungen gibt es beim Schleifen bisher keine prozessbegleitende Technik zur Messung der thermomechanischen Beanspruchungen in Form von Verschiebungen und Dehnungen in der bearbeiteten Randzone. Aus diesem Grund wird die Eignung der Speckle-Fotografie für prozessbegleitende Messungen von Werkstückbeanspruchungen in einem laufenden Schleifprozess ohne Kühlschmierstoff nachgewiesen und ein Konzept für eine Messung unter dem Einsatz von Kühlschmierstoffen vorgestellt.
Potential of the neutron Lloyd's mirror interferometer for the search for new interactions
Creators: name: Pokotilovski, Yu. N.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We discuss the potential of the neutron Lloyd's mirror interferometer in a search for new interactions at small scales. We consider three hypothetical interactions that may be tested using the interferometer. The chameleon scalar field proposed to solve the enigma of accelerating expansion of the Universe produces interaction between particles and matter. The axion-like spin-dependent coupling between neutron and nuclei or/and electrons may cause P- and T-non-invariant interaction with matter. Hypothetical non-Newtonian gravitational interactions mediates additional short-range potential between neutrons and bulk matter. These interactions between the neutron and the mirror of the Lloyd's type neutron interferometer cause phase shift of neutron waves. We estimate the sensitivity and systematic effects of possible experiments.
description: 13 pages + 8 figures. arXiv admin note: substantial text overlap with arXiv:1203.5017
The Montrose-La Crescenta (California) Flood of January 1, 1934, and its Sedimentary Aspects
Creators: name: Chawner, William Donald
Publisher: name: California Institute of Technology
Year: 1934
Subjects: subject: Geology
subject: FOS: Earth and related environmental sciences

description: New Year's morning, 1934, the residents of Southern California were aware that the rainstorm of the last two days had been severe, and especially so during the night before. But to most of them, if they thought about it at all, it was only a slight inconvenience. The majority of the residents of Los Angeles County did not realize or suspect that during the night a major disaster had occurred in their midst. The small foothill communities of Montrose
and La Crescenta, twelve miles north of the center of Los Angeles, and a part of the larger community of Glendale, five miles south of Montrose, had been partially torn away or buried by an overwhelming flow of water, mud, and rock from the steep canyons of the San Gabriel Range to the north of them.
Simulation with Fluctuating and Singular Rates
Creators: name: Barekat, Farzin
name: Caflisch, Russel
Publisher: name: arXiv
Year: 2013
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: In this paper we present a method to generate independent samples for a general random variable, either continuous or discrete. The algorithm is an extension of the acceptance-rejection method, and it is particularly useful for kinetic simulation in which the rates are fluctuating in time and have singular limits, as occurs for example in simulation of recombination interactions in a plasma. Although it depends on some additional requirements, the new method is easy to implement and rejects less samples than the acceptance-rejection method.
description: 22 pages, 6 figures
Geometric Partitioning of Complex Surface Measurements
Creators: name: Von Freyberg, Axel
name: Fischer, Andreas
Publisher: name: IEEE
Year: 2020
Subjects: subject: Automatic partitioning
subject: Combined complex geometries
subject: Holistic approximation (HA)
subject: Orthogonal ellipse distance
subject: Root point iteration
subject: 600

description: Dimensional inspection of microparts is challenging. Optimized processes, such as microdeep-drawing with tailored tools, even increase the requirements. While the development of fast and precise data acquisition techniques is in progress and various solutions already exist, the geometrical evaluation of measuring data still shows open questions: 1) the evaluation methods for freeform surfaces do not provide information in a form that can be directly used to assess dimensional tolerances; 2) manual association of approximating geometric elements to points is not suited for high inspection rates; and 3) partitioning based on the nominal workpiece coordinate system is affected by alignment uncertainties. An algorithm was developed for the automated evaluation of surface measuring data composed of geometric primitives, such as planes, cylinders, and tori, which combines and optimizes the estimation of geometric parameters together with the automatic partitioning of the measured points. This article presents the extension of this holistic approximation (HA) with root point iteration in order to evaluate more complex geometric elements. The verification of the extended HA for a 2-D combination of lines and an ellipse shows no systematic error and achievable uncertainties below 0.8 μm for the approximated shape parameters of an ellipse for simulated surface data with uniformly distributed noise in the range of 1.0 μm. The validation in comparison with commercial metrology software finally exhibits the full potential of the extended HA. As a result, a fully automatic dimensional evaluation is possible, providing geometric parameters that can directly be compared to nominal specifications and tolerances.
Equivariant Gerbes on Complex Tori
Creators: name: Ben-Bassat, Oren
Publisher: name: arXiv
Year: 2011
Subjects: subject: Algebraic Geometry (math.AG)
subject: High Energy Physics - Theory (hep-th)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 53C08, 20C25, 20J06

description: We explore a new direction in representation theory which comes from holomorphic gerbes on complex tori. The analogue of the theta group of a holomorphic line bundle on a (compact) complex torus is developed for gerbes in place of line bundles. The theta group of symmetries of the gerbe has the structure of a Picard groupoid. We calculate it explicitly as a central extension of the group of symmetries of the gerbe by the Picard groupoid of the underlying complex torus. We discuss obstruction to equivariance and give an example of a group of symmetries of a gerbe with respect to which the gerbe cannot be equivariant. We survey various types of representations of the group of symmetries of a gerbe on the stack of sheaves of modules on the gerbe and the associated abelian category of sheaves on the gerbe (twisted sheaves).
Flore d'Afrique centrale - Spermatophyta - Santalaceae
Creators: name: Robyns W., Lawalrée A.
Publisher: name: Zenodo
Year: 1948
Subjects: Flora
Plants
Identification
Botany
Systematics
Taxonomy
Central Africa
Democratic Republic of the Congo
Rwanda
Burundi

description: PDF version of treatment of Santalaceae in Flore d'Afrique centrale series
Flore d'Afrique centrale - Spermatophyta - Opiliaceae
Creators: name: Louis J., Léonard J.
Publisher: name: Zenodo
Year: 1948
Subjects: Flora
Plants
Identification
Botany
Systematics
Taxonomy
Central Africa
Democratic Republic of the Congo
Rwanda
Burundi

description: PDF version of treatment of Opiliaceae in Flore d'Afrique centrale series
Azimuthal asymmetries in high-energy collisions of protons with holographic shockwaves
Creators: name: Noronha, Jorge
name: Dumitru, Adrian
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Large azimuthal quadrupole and octupole asymmetries have recently been found in p+Pb collisions at the LHC. We argue that these might arise from a projectile dipole scattering off fluctuations in the target with a size on the order of the dipole. In a holographic scenario, parity even angular moments $v_{2n}$ are generated by the real part of the light-like Wilson loop due to the contribution from the background metric to the Nambu-Goto action. On the other hand, parity odd moments $v_{2n+1}$ must arise from the imaginary part of the light-like Wilson loop, which is naturally induced by a fluctuating Neveu-Schwarz 2-form.
description: improved discussion, clearer introduction and outline, added references, to appear in Physical Review D
CP-Semigroups and Dilations, Subproduct Systems and Superproduct Systems: The Multi-Parameter Case and Beyond
Creators: name: Shalit, Orr
name: Skeide, Michael
Publisher: name: arXiv
Year: 2020
Subjects: subject: Operator Algebras (math.OA)
subject: FOS: Mathematics
subject: 46L55, 46L07, 46L53

description: These notes are the output of a decade of research on how the results about dilations of one-parameter CP-semigroups with the help of product systems, can be put forward to d-parameter semigroups - and beyond. While exisiting work on the two- and d-parameter case is based on the approach via the Arveson-Stinespring correspondence of a CP-map by Muhly and Solel (and limited to von Neumann algebras), here we explore consequently the approach via Paschke's GNS-correspondence of a CP-map by Bhat and Skeide. (A comparison is postponed to Appendix A(iv).)
 The generalizations are multi-fold, the difficulties often enormous. In fact, our only true if-and-only-if theorem, is the following: A Markov semigroup over (the opposite of) an Ore monoid admits a full (strict or normal) dilation if and only if its GNS-subproduct system embeds into a product system. Already earlier, it has been observed that the GNS- (respectively, the Arveson-Stinespring) correspondences form a subproduct system, and that the main difficulty is to embed that into a product system. Here we add, that every dilation comes along with a superproduct system (a product system if the dilation is full). The latter may or may not contain the GNS-subproduct system; it does, if the dilation is strong - but not only.
 Apart from the many positive results pushing forward the theory to large extent, we provide plenty of counter examples for almost every desirable statement we could not prove. Still, a small number of open problems remains. The most prominent: Does there exist a CP-semigroup that admits a dilation, but no strong dilation? Another one: Does there exist a Markov semigroup that admits a (necessarily strong) dilation, but no full dilation?
description: (SEE ALSO COMMENTS TO V2.) In this revision: Corrected a bad missprint caused by a cut-and-paste error during index production, which made almost unreadable a prerequisite for one of our major results. (Last paragraph p.66 (after "dual" and Corollary 7.7.) Further minor corrections to the index
Waveguide photon-number-resolving detectors for quantum photonic integrated circuits
Creators: name: Sahin, D.
name: Gaggero, A.
name: Zhou, Z.
name: Jahanmirinejad, S.
name: Mattioli, F.
name: Leoni, R.
name: Beetz, J.
name: Lermer, M.
name: Kamp, M.
name: Höfling, S.
name: Fiore, A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Quantum photonic integration circuits are a promising approach to scalable quantum processing with photons. Waveguide single-photon-detectors (WSPDs) based on superconducting nanowires have been recently shown to be compatible with single-photon sources for a monolithic integration. While standard WSPDs offer single-photon sensitivity, more complex superconducting nanowire structures can be configured to have photon-number-resolving capability. In this work, we present waveguide photon-number-resolving detectors (WPNRDs) on GaAs/Al0.75Ga0.25As ridge waveguides based on a series connection of nanowires. The detection of 0-4 photons has been demonstrated with a four-wire WPNRD, having a single electrical read-out. A device quantum efficiency ~24 % is reported at 1310 nm for the TE polarization.
description: 12 pages, 4 figures
Flore d'Afrique centrale - Spermatophyta - Ulmaceae
Creators: name: Hauman, L.
Publisher: name: Zenodo
Year: 1948
Subjects: Flora
Plants
Identification
Botany
Systematics
Taxonomy
Central Africa
Democratic Republic of the Congo
Rwanda
Burundi

description: PDF version of treatment of Ulmaceae in Flore d'Afrique centrale series
Idoneal genera and K3 surfaces covering an Enriques surface
Creators: name: Brandhorst, Simon
name: Sonel, Serkan
name: Veniani, Davide Cesare
Publisher: name: arXiv
Year: 2020
Subjects: subject: Algebraic Geometry (math.AG)
subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11E12 14J28

description: Idoneal genera are a generalization of Euler's idoneal numbers. We enumerate all idoneal genera by means of the Smith--Minkowski--Siegel mass formula. As an application, we classify transcendental lattices of K3 surfaces covering an Enriques surface.
description: final version, accepted on J. Pure Appl. Algebra
Delay Violation Probability and Effective Rate of Downlink NOMA over $α$-$μ$ Fading Channels
Creators: name: Kumar, Vaibhav
name: Cardiff, Barry
name: Prakriya, Shankar
name: Flanagan, Mark F.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Information Theory (cs.IT)
subject: Signal Processing (eess.SP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Non-orthogonal multiple access (NOMA) is a potential candidate to further enhance the spectrum utilization efficiency in beyond fifth-generation (B5G) standards. However, there has been little attention on the quantification of the delay-limited performance of downlink NOMA systems. In this paper, we analyze the performance of a two-user downlink NOMA system over generalized α-μ fading in terms of delay violation probability (DVP) and effective rate (ER). In particular, we derive an analytical expression for an upper bound on the DVP and we derive the exact sum ER of the downlink NOMA system. We also derive analytical expressions for high and low signal-to-noise ratio (SNR) approximations to the sum ER, as well as a fundamental upper bound on the sum ER which represents the ergodic sum-rate for the downlink NOMA system. We also analyze the sum ER of a corresponding time-division-multiplexed orthogonal multiple access (OMA) system. Our results show that while NOMA consistently outperforms OMA over the practical SNR range, the relative gain becomes smaller in more severe fading conditions, and is also smaller in the presence a more strict delay quality-of-service (QoS) constraint.
description: 14 pages, 12 figures
Berkovich Spaces and Tubular Descent
Creators: name: Ben-Bassat, O.
name: Temkin, M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Algebraic Geometry (math.AG)
subject: K-Theory and Homology (math.KT)
subject: FOS: Mathematics
subject: 14A20, 13J07, 14G22, 14E25

description: We consider an algebraic variety X together with the choice of a subvariety Z. We show that any coherent sheaf on X can be constructed out of a coherent sheaf on the formal neighborhood of Z, a coherent sheaf on the complement of Z, and an isomorphism between certain representative images of these two sheaves in the category of coherent sheaves on a Berkovich analytic space W which we define.
description: 20 pages
Observational constraints on G-corrected holographic dark energy using a Markov chain Monte Carlo method
Creators: name: Alavirad, Hamzeh
name: Malekjani, Mohammad
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We constrain holographic dark energy (HDE) with time varying gravitational coupling constant in the framework of the modified Friedmann equations using cosmological data from type Ia supernovae, baryon acoustic oscillations, cosmic microwave background radiation and X-ray gas mass fraction. Applying a Markov Chain Monte Carlo (MCMC) simulation, we obtain the best fit values of the model and cosmological parameters within $1σ$ confidence level (CL) in a flat universe as: $Ω_{\rm b}h^2=0.0222^{+0.0018}_{-0.0013}$, $Ω_{\rm c}h^2 =0.1121^{+0.0110}_{-0.0079}$, $α_{\rm G}\equiv \dot{G}/(HG) =0.1647^{+0.3547}_{-0.2971}$ and the HDE constant $c=0.9322^{+0.4569}_{-0.5447}$. Using the best fit values, the equation of state of the dark component at the present time $w_{\rm d0}$ at $1σ$ CL can cross the phantom boundary $w=-1$.
description: 11 pages, two figures, one table
Flore d'Afrique centrale - Spermatophyta - Chenopodiaceae
Creators: name: Hauman, L.
Publisher: name: Zenodo
Year: 1951
Subjects: Flora
Plants
Identification
Botany
Systematics
Taxonomy
Central Africa
Democratic Republic of the Congo
Rwanda
Burundi

description: PDF version of treatment of Chenopodiaceae in Flore d'Afrique centrale series
Lagrangian Framework for Systems Composed of High-Loss and Lossless Components
Creators: name: Figotin, Alex
name: Welters, Aaron
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mathematical Physics (math-ph)
subject: Spectral Theory (math.SP)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 37J05, 37J15, 37J40, 70H03, 70H05, 70H09

description: Using a Lagrangian mechanics approach, we construct a framework to study the dissipative properties of systems composed of two components one of which is highly lossy and the other is lossless. We have shown in our previous work that for such a composite system the modes split into two distinct classes, high-loss and low-loss, according to their dissipative behavior. A principal result of this paper is that for any such dissipative Lagrangian system, with losses accounted by a Rayleigh dissipative function, a rather universal phenomenon occurs, namely, selective overdamping: The high-loss modes are all overdamped, i.e., non-oscillatory, as are an equal number of low-loss modes, but the rest of the low-loss modes remain oscillatory each with an extremely high quality factor that actually increases as the loss of the lossy component increases. We prove this result using a new time dynamical characterization of overdamping in terms of a virial theorem for dissipative systems and the breaking of an equipartition of energy.
description: 53 pages, 1 figure; Revision of our original manuscript to incorporate suggestions from referee
Flore d'Afrique centrale - Spermatophyta - Gnetaceae
Creators: name: Robyns, W.
Publisher: name: Zenodo
Year: 1948
Subjects: Flora
Plants
Identification
Systematics
Taxonomy
Central Africa
Democratic Republic of the Congo
Rwanda
Burundi

description: PDF version of treatment of Gnetaceae in Flore d'Afrique centrale series
Milnor descent for cohesive dg-categories
Creators: name: Ben-Bassat, Oren
name: Block, Jonathan
Publisher: name: arXiv
Year: 2012
Subjects: subject: Algebraic Geometry (math.AG)
subject: K-Theory and Homology (math.KT)
subject: Quantum Algebra (math.QA)
subject: FOS: Mathematics
subject: 46L87, 14A22, 53D55, 14A20, 58B34

description: We show that the functor from curved differential graded algebras to differential graded categories, defined by the second author in [B], sends Cartesian diagrams to homotopy Cartesian diagrams, under certain reasonable hypotheses. This is an extension to the arena of dg categories of a construction of projective modules due to Milnor. As an example, we show that the functor satisfies descent for certain partitions of a complex manifold.
description: 21 pages
Flore d'Afrique centrale - Spermatophyta - Piperaceae
Creators: name: Balle, S.
Publisher: name: Zenodo
Year: 1948
Subjects: Flora
Plants
Identification
Botany
Systematics
Taxonomy
Central Africa
Democratic Republic of the Congo
Rwanda
Burundi

description: PDF version of treatment of Piepraceae in Flore d'Afrique centrale series
title: An Experimental Study for the Effect of Specimen Size on Shear Behavior of Granular Materials
Creators: name: Parker IV, Clifton Linwood
Publisher: name: Old Dominion University Libraries
Year: 1992

description: An experimental study was undertaken to look into the effect of specimen size on the volumetric behavior of granular triaxial specimens. It was hypothesized that the specimen preparation mold creates a unique particle arrangement near the perimeter of the specimen and thus, for smaller specimen diameter relative to the particle size, it will exhibit a greater effect of the unique particle arrangement on the volumetric behavior. particles was used A single distribution of spherical glass throughout the testing. The tested specimens were 3.6, 2.8, 2.0, 1.4, 1.0, and 0.6 inches in diameter with a fixed two to one specimen height to diameter ratio. Additionally, lubricated rubber membranes on the end caps were used to provide "frictionless" strain boundaries. All specimens were first isotropically consolidated up to 20 psi, i.e. σ1=σ2=σ3=20 psi, and then were subjected to shearing in triaxial compression and triaxial extension modes with a constant total stress of 60 psi, i.e. σ1+σ2+σ3=60 psi. The 1 inch and 0. 6 inch specimens show large densification in extension mode compared to bigger diameter specimens. The volume changes in compression mode, although erratic are consistent with the hypothesis of the research.
Consequences of the single-pair measurement of the Bell parameter
Creators: name: Genovese, Marco
name: Piacentini, Fabrizio
Publisher: name: arXiv
Year: 2024
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Bell inequalities represent a milestone for contemporary Physics, both for quantum foundations investigation and technological applications (e.g., quantum communication and entanglement certification). Although loophole-free tests have been recently performed, a strong debate is still ongoing on the actual meaning of Bell inequality tests, for example on the possible additional hypotheses (end eventual loopholes) to be included in Bell's theorem, as well as on the implications for certain interpretations of quantum mechanics. A recent work [S. Virzì et al., Quantum Sci. Technol. 9, 045027 (2024)] challenges some of the statements appeared in this debate, achieving for the first time an experimental estimation of the entire Bell-CHSH parameter from a single entangled pair thanks to a weak-interaction-based measurement approach. Here we analyse the implications of this result for quantum mechanics foundations investigation, illustrating how it can tackle some of the aforementioned interpretations of Bell inequality tests and, more in general, of quantum mechanics itself.
The Daugavet property and translation-invariant subspaces
Creators: name: Lücking, Simon
Publisher: name: arXiv
Year: 2013
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 46B04, 43A46

description: Let $G$ be an infinite, compact abelian group and let $\varLambda$ be a subset of its dual group $\varGamma$. We study the question which spaces of the form $C_\varLambda(G)$ or $L^1_\varLambda(G)$ and which quotients of the form $C(G)/C_\varLambda(G)$ or $L^1(G)/L^1_\varLambda(G)$ have the Daugavet property. We show that $C_\varLambda(G)$ is a rich subspace of $C(G)$ if and only if $\varGamma \setminus \varLambda^{-1}$ is a semi-Riesz set. If $L^1_\varLambda(G)$ is a rich subspace of $L^1(G)$, then $C_\varLambda(G)$ is a rich subspace of $C(G)$ as well. Concerning quotients, we prove that $C(G)/C_\varLambda(G)$ has the Daugavet property, if $\varLambda$ is a Rosenthal set, and that $L^1_\varLambda(G)$ is a poor subspace of $L^1(G)$, if $\varLambda$ is a nicely placed Riesz set.
description: 20 pages
16S rRNA gene amplicon sequencing of MRL/lpr mice
Creators: name: Zhi(Liu)
Publisher: name: CNGB
Year: 2023
Subjects: Metagenome
Multispecies
Model organism

description: Systemic lupus erythematosus, characterized by persistent inflammation, is a complex autoimmune disorder without known cure. Dysbiosis of gut microbiota promotes autoimmune disorders that damage extraintestinal organs. 16S rRNA gene amplicon sequencing was performed on the fecal samples of MRL/lpr mice.
Current fidelity susceptibility and conductivity in one-dimensional lattice models with open and periodic boundary conditions
Creators: name: Greschner, S.
name: Kolezhuk, A. K.
name: Vekua, T.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study, both numerically and analytically, the finite size scaling of the fidelity susceptibility χ_{J} with respect to the charge or spin current in one-dimensional lattice models, and relate it to the low-frequency behavior of the corresponding conductivity. It is shown that in gapless systems with open boundary conditions the leading dependence on the system size L stems from the singular part of the conductivity and is quadratic, with a universal form χ_{J}= 7KL^2 ζ(3)/2π^4 where K is the Luttinger liquid parameter. In contrast to that, for periodic boundary conditions the leading system size dependence is directly connected with the regular part of the conductivity (giving alternative possibility to study low frequency behavior of the regular part of conductivity) and is subquadratic, χ_{J} \propto L^γ(K), (with a K dependent constant γ) in most situations linear, γ=1. For open boundary conditions, we also study another current-related quantity, the fidelity susceptibility to the lattice tilt χ_{P} and show that it scales as the quartic power of the system size, χ_{P}=31KL^4 ζ(5)/8 u^2 π^6, where u is the sound velocity. We comment on the behavior of the current fidelity susceptibility in gapped phases, particularly in the topologically ordered Haldane state.
description: 11 pages, 7 eps figures
Efficient Extraction of Noise-Robust Discrete Units from Self-Supervised Speech Models
Creators: name: Poncelet, Jakob
name: Wang, Yujun
name: Van hamme, Hugo
Publisher: name: arXiv
Year: 2024
Subjects: subject: Audio and Speech Processing (eess.AS)
subject: Sound (cs.SD)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: Continuous speech can be converted into a discrete sequence by deriving discrete units from the hidden features of self-supervised learned (SSL) speech models. Although SSL models are becoming larger and trained on more data, they are often sensitive to real-life distortions like additive noise or reverberation, which translates to a shift in discrete units. We propose a parameter-efficient approach to generate noise-robust discrete units from pre-trained SSL models by training a small encoder-decoder model, with or without adapters, to simultaneously denoise and discretise the hidden features of the SSL model. The model learns to generate a clean discrete sequence for a noisy utterance, conditioned on the SSL features. The proposed denoiser outperforms several pre-training methods on the tasks of noisy discretisation and noisy speech recognition, and can be finetuned to the target environment with a few recordings of unlabeled target data.
description: Accepted at SLT2024
Flore d'Afrique centrale - Spermatophyta - Basellaceae
Creators: name: Hauman, L.
Publisher: name: Zenodo
Year: 1951
Subjects: Flora
Plants
Identification
Botany
Systematics
Taxonomy
Central Africa
Democratic Republic of the Congo
Rwanda
Burundi

description: PDF version of treatment of Basellaceae in Flore d'Afrique centrale series
A Tale of Two Distributions: From Few To Many Vortices In Quasi-Two-Dimensional Bose-Einstein Condensates
Creators: name: Kolokolnikov, T.
name: Kevrekidis, P. G.
name: Carretero-Gonzalez, R.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: Motivated by the recent successes of particle models in capturing the precession and interactions of vortex structures in quasi-two-dimensional Bose-Einstein condensates, we revisit the relevant systems of ordinary differential equations. We consider the number of vortices $N$ as a parameter and explore the prototypical configurations ("ground states") that arise in the case of few or many vortices. In the case of few vortices, we modify the classical result of Havelock [Phil. Mag. ${\bf 11}$, 617 (1931)] illustrating that vortex polygons in the form of a ring are unstable for $N \geq7$. Additionally, we reconcile this modification with the recent identification of symmetry breaking bifurcations for the cases of $N=2,\dots,5$. We also briefly discuss the case of a ring of vortices surrounding a central vortex (so-called $N+1$ configuration). We finally examine the opposite limit of large $N$ and illustrate how a coarse-graining, continuum approach enables the accurate identification of the radial distribution of vortices in that limit.
description: 15 pages, 2 figures
Jacobi-Trudi identity and Drinfeld functor for super Yangian
Creators: name: Lu, Kang
name: Mukhin, Evgeny
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Algebra (math.QA)
subject: Mathematical Physics (math-ph)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We show that the quantum Berezinian which gives a generating function of the integrals of motions of XXX spin chains associated to super Yangian $\mathrm{Y}(\mathfrak{gl}_{m|n})$ can be written as a ratio of two difference operators of orders $m$ and $n$ whose coefficients are ratios of transfer matrices corresponding to explicit skew Young diagrams.
 In the process, we develop several missing parts of the representation theory of $\mathrm{Y}(\mathfrak{gl}_{m|n})$ such as $q$-character theory, Jacobi-Trudi identity, Drinfeld functor, extended T-systems, Harish-Chandra map.
description: LaTeX, 35 pages, several figures; V2: added more details