cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Anderson localization vs. Mott-Hubbard metal-insulator transition in disordered, interacting lattice fermion systems
Creators: name: Byczuk, K.
name: Hofstetter, W.
name: Vollhardt, D.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We review recent progress in our theoretical understanding of strongly correlated fermion systems in the presence of disorder. Results were obtained by the application of a powerful nonperturbative approach, the Dynamical Mean-Field Theory (DMFT), to interacting disordered lattice fermions. In particular, we demonstrate that DMFT combined with geometric averaging over disorder can capture Anderson localization and Mott insulating phases on the level of one-particle correlation functions. Results are presented for the ground-state phase diagram of the Anderson-Hubbard model at half filling, both in the paramagnetic phase and in the presence of antiferromagnetic order. We find a new antiferromagnetic metal which is stabilized by disorder. Possible realizations of these quantum phases with ultracold fermions in optical lattices are discussed.
description: 25 pages, 5 figures, typos corrected, references updated
Differentiating the Weyl generic dimension formula and support varieties for quantum groups
Creators: name: Drupieski, Christopher M.
name: Nakano, Daniel K.
name: Parshall, Brian J.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Group Theory (math.GR)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 17B55, 20G, 17B50

description: The authors compute the support varieties of all irreducible modules for the small quantum group $u_ζ(\mathfrak{g})$, where $\mathfrak{g}$ is a simple complex Lie algebra, and $ζ$ is a primitive $\ell$-th root of unity with $\ell$ larger than the Coxeter number of $\mathfrak{g}$. The calculation employs the prior calculations and techniques of Ostrik and of Nakano--Parshall--Vella, as well as deep results involving the validity of the Lusztig character formula for quantum groups and the positivity of parabolic Kazhdan-Lusztig polynomials for the affine Weyl group. Analogous support variety calculations are provided for the first Frobenius kernel $G_1$ of a reductive algebraic group scheme $G$ defined over the prime field $\mathbb{F}_p$.
description: 10 pages, various typos corrected, references updated
The Impact of the Uncertainty in Single-Epoch Virial Black Hole Mass Estimates on the Observed Evolution of the Black Hole - Bulge Scaling Relations
Creators: name: Shen, Yue
name: Kelly, Brandon C.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Recent observations of the black hole (BH) - bulge scaling relations usually report positive redshift evolution, with higher redshift galaxies harboring more massive BHs than expected from the local relations. All of these studies focus on broad line quasars with BH mass estimated from virial estimators based on single-epoch spectra. Since the sample selection is largely based on quasar luminosity, the cosmic scatter in the BH-bulge relation introduces a statistical bias leading to on average more massive BHs given galaxy properties at high redshift (Lauer et al. 2007). We here emphasize a previously under-appreciated statistical bias resulting from the uncertainty of single-epoch virial BH mass estimators and the shape of the underlying (true) BH mass function, which leads to on average overestimation of the true BH masses at the high-mass end (Shen et al. 2008). We demonstrate that the latter virial mass bias can contribute a substantial amount to the observed excess in BH mass at fixed bulge properties, comparable to the Lauer et al. bias. The virial mass bias is independent of the Lauer et al. bias, hence if both biases are at work, they can largely (or even fully) account for the observed BH mass excess at high redshift.
description: Replaced with the accepted version.
Nuclear effective field theory on the lattice
Creators: name: Krebs, Hermann
name: Borasoy, Bugra
name: Epelbaum, Evgeny
name: Lee, Dean
name: Meißner, Ulf-G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: In the low-energy region far below the chiral symmetry breaking scale (which is of the order of 1 GeV) chiral perturbation theory provides a model-independent approach for quantitative description of nuclear processes. In the two- and more-nucleon sector perturbation theory is applicable only at the level of an effective potential which serves as input in the corresponding dynamical equation. To deal with the resulting many-body problem we put chiral effective field theory (EFT) on the lattice. Here we present the results of our lattice EFT study up to next-to-next-to-leading order in the chiral expansion. Accurate description of two-nucleon phase-shifts and ground state energy ratio of dilute neutron matter up to corrections of higher orders shows that lattice EFT is a promising tool for a quantitative description of low-energy few- and many-body systems.
description: 15 pages, 9 figures, plenary talk presented at the XXVI International Symposium on Lattice Field Theory, July 14-19, 2008, Williamsburg, Virginia, USA
Doping dependence of spin fluctuations and electron correlations in iron pnictides
Creators: name: Ikeda, Hiroaki
name: Arita, Ryotaro
name: Kuneš, Jan
Publisher: name: arXiv
Year: 2010
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Doping dependence of the spin fluctuations and the electron correlations in the effective five-band Hubbard model for iron pnictides is investigated using the fluctuation-exchange approximation. For a moderate hole doping, we find a dominant low-energy spin excitation at Q=(π,0), which becomes critical at low temperature. The low-energy spin excitations in the heavily hole-doped region are characterized by weak Q dependence. The electron doping leads to an appearance of a pseudogap in spin excitation spectrum. Correspondingly, the NMR-1/T1 relaxation rate is strongly enhanced on the hole-doped side and suppressed on the electron-doped side of the phase diagram. This behavior can be to large extent understood by systematic changes of the Fermi-surface topology.
description: 4 pages, 5 figures
Conformation analysis of some novel isomeric phosphate esters by phosphorus nuclear magnetic resonance spectroscopy.
Creators: name: Malcolm, Robert Bennet
Publisher: name: University of British Columbia
Year: 2011

description: A series of isomeric, six-membered, cyclic phenyl phosphate esters has been obtained by column chromatography of the mixtures of isomers obtained by reaction of phenyl phosphorodichloridate with appropriate 1,3-diols. The conformational analysis of the isomers was undertaken using both ¹ʜ and ³¹p n.m.r.. The basic conformation of the 2 oxo-2-phenoxy-1,3,2-dioxaphosphorinane ring system is that of a "flattened-chair". The thermodynamic free energy difference between "chair" conformations is sufficiently large for the basic ring to exist essentially in one favoured conformation, rationalized to have an axial phenoxy substituent. The stereospecific nature of Jpoch has been confirmed by using ¹ʜ n.m.r. to determine conformations. Long-range, ⁴J, ³¹p- ¹ʜ coupling constants have been found to be stereospecific in nature and useful in facilitating assignment of conformations for methyl-substituted-2-oxo-2-phenoxy-l,3,2-dioxaphosphorinanes. Similar ring systems having different substituents at phosphorus have been studied and the conformations of these derivatives are seen to differ depending on the nature of the phosphorus substituent. The conformation of a cyclic nucleotide has been determined from its ³¹p n.m.r. spectrum. The use of computer programming techniques and hetero-nuclear double resonance techniques, greatly facilitated the analysis of the n.m.r. spectra discussed. An interesting deceptively-simple type of ABX n.m.r. spectrum has been found for many of these cyclic phosphate derivatives and the explicit analysis of this system is presented.
Additional file 1 of cnnLSV: detecting structural variants by encoding long-read alignment information and convolutional neural network
Creators: name: Ma, Huidong
name: Zhong, Cheng
name: Chen, Danyang
name: He, Haofa
name: Yang, Feng
Publisher: name: figshare
Year: 2023
Subjects: subject: Artificial Intelligence and Image Processing
subject: FOS: Computer and information sciences

description: Additional file 1. Supplementary information.
Quantum measurement with chaotic apparatus
Creators: name: Everitt, M. J.
name: Munro, W. J.
name: Spiller, T. P.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Quantum Physics (quant-ph)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: We study a dissipative quantum mechanical model of the projective measurement of a qubit. We demonstrate how a correspondence limit, damped quantum oscillator can realise chaotic-like or periodic trajectories that emerge in sympathy with the projection of the qubit state, providing a model of the measurement process.
description: 8 pages, 10 figures
Loss and damage from climate change: A new climate justice agenda
Creators: name: Boyd, Emily
name: Chaffin, Brian C
name: Dorkenoo, Kelly
name: Jackson, Guy
name: Harrington, Luke
name: N'Guetta, Alicia
name: Johansson, Emma L
name: Nordlander, Linnéa
name: De Rosa, Salvatore Paolo
name: Raju, Emmanuel
name: Scown, Murray
name: Soo, Joyce
name: Stuart-Smith, Rupert
Publisher: name: Open Access Victoria University of Wellington | Te Herenga Waka
Year: 2021
Subjects: Uncategorized

description: No description supplied
Addition mechanism of group V hydrides to hexafluorobutyne-2, and the electronic spectra of the resultant adducts
Creators: name: Leeder, W. Ross
Publisher: name: University of British Columbia
Year: 2011

description: The addition of dimethylarsine to hexafluoro-butyne-2 has previously been shown to give the predominantly trans 1:1 adduct, Me₂AsC(CF₃)=C(CF₃)H. In this work, a mechanistic study was made of the addition of dimethylarsine, as well as other Group V hydrides, to hexafluorobutyne-2. This was done to help shed light on the relatively unknown area of noncatalyzed nucleophilic hydride additions to acetylenes. In the course of the mechanistic investigation, the electronic properties of the product adducts became of interest, and consequently ultraviolet and photoelectron spectroscopy were used to study the arsine adducts as well as similiar Group V derivatives. The addition reaction was found to be kinetically controlled by the nucleophilic attack of the arsine molecule on the electron deficient carbon-carbon triple bond. A detailed discussion of the addition stereochemistry is necessary to explain many of the results found in this work, as well as those found by other investigators. Generally the noncatalyzed additions of Group V hydrides to acetylenes are predominantly, though not stereo-specifically, trans additions. Cis kinetic additions are possible under certain circumstances. The ultraviolet absorption found for the 1:1 adducts of Group V hydrides and hexafluorobutyne-2, can be assigned to a n-π* (or n-R) band. An unequivocal choice between the two possibilities cannot be made from the results obtained in this work. These assignments are suggested from experimental data about the upper ground states using photoelectron spectroscopy, the excited state using ultraviolet spectroscopy,and the intensities and solvent effects of the ultraviolet bands.
Morphuzz VMs
Creators: name: Bulekov, Alexander
Publisher: name: Zenodo
Year: 2021

description: VMs for fuzzing virtual devices in QEMU and Bhyve using Morphuzz. The work is described in: "MORPHUZZ: Bending (Input) Space to Fuzz Virtual Devices" 31st USENIX Security Symposium (USENIX Security 22). 2022.
Bibliotheksmanagementsystem in der Alma-Cloud: Was bleibt und was hat sich verändert?
Creators: name: Pieper, Dirk
Publisher: name: Kolloquium Wissensinfrastruktur
Year: 2021

description: Seit einem halben Jahr arbeiten wir in und mit der Alma-Cloud. Lokal betriebene Bibliotheksmanagementsysteme waren allerdings auch schon vorher keine isolierten Systeme, sondern Teil von verschiedenen Informationsinfrastrukturzusammenhängen, zum Beispiel im Kontext von nationalen und regionalen Bibliotheksservices oder innerhalb der Universität. Von den Strukturen vor der Einführung von Alma ausgehend stellt der Vortrag dar, was sich aus systemtechnischer Perspektive verändert hat und welche Auswirkungen dies für die Arbeit mit dem Bibliotheksmanagementsystem an der Universitätsbibliothek Bielefeld hat.
description: Kolloquium Wissensinfrastruktur, Wintersemester 2021/22
Turbulence without Richardson-Kolmogorov cascade
Creators: name: Mazellier, Nicolas
name: Vassilicos, Christos
Publisher: name: arXiv
Year: 2009
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We present an experimental investigation of intense turbulence generated by a class of low-blockage space-filling fractal square grids. We confirm the existence of a protacted production region followed by a decaying region, as first reported by Hurst & Vassilicos (Physics of Fluids, 2007). We show that the centerline streamwise variation of most of the statistical properties of the turbulent flow can be scaled by a wake interaction length-scale $x_*$. We also confirm the finding of Seoud and Vassilicos (Physics of Fluids, 2007) that the ratio of the integral length-scale $L_u$ to the Taylor micro-scale $λ$ remains constant in the decaying region whereas the Reynolds number $Re_λ$ strongly decreases. As a result the scaling $L_{u}/λ\sim Re_λ$ which follows from the $u'^{3}/L_u$ scaling of the dissipation rate in boundary-free shear flows and in usual grid-generated turbulence does not hold here. However, we show that the ratio $L_u/λ$ is an increasing function of the inlet Reynolds number $Re_0$. This extraordinary decoupling is consistent with a self-preserving single length-scale decaying homogeneous turbulence proposed by George & Wang (Physics of Fluids, 2009) with which our results are compared.
description: 37 pages, 25 figures, submitted to Physics of Fluids, revised version (shortened introduction and conclusion)
Continuous-Discrete Path Integral Filtering
Creators: name: Balaji, Bhashyam
Publisher: name: arXiv
Year: 2008
Subjects: subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: A summary of the relationship between the Langevin equation, Fokker-Planck-Kolmogorov forward equation (FPKfe) and the Feynman path integral descriptions of stochastic processes relevant for the solution of the continuous-discrete filtering problem is provided in this paper. The practical utility of the path integral formula is demonstrated via some nontrivial examples. Specifically, it is shown that the simplest approximation of the path integral formula for the fundamental solution of the FPKfe can be applied to solve nonlinear continuous-discrete filtering problems quite accurately. The Dirac-Feynman path integral filtering algorithm is quite simple, and is suitable for real-time implementation.
description: 35 pages, 18 figures, JHEP3 class
TRADURRE L’AGRICOLA DI TACITO IN ETÀ NAPOLEONICA: IL CASO DI G. F. GALEANI NAPIONE
Creators: name: Benedetto, Giovanni
Publisher: name: Italiano LinguaDue
Year: 2021

description: A proposito di origini, contesto e caratteristiche della traduzione dell’Agricola di Tacito ad opera del dotto piemontese G.F. Galeani Napione: pubblicata nel 1806, cioè in anni in cui ancora pareva prossima un’invasione dell’Inghilterra a partire dalla Francia, nelle ampie prefazione e postfazione indirettamente ma chiaramente dimostra di sostenere posizioni anglofile e antinapoleoniche, del tutto conformi a quelle proprie di Galeani Napione, limitatosi ad operare nell’ambito dell’Accademia delle Scienze di Torino negli anni dell’annessione del Piemonte alla Francia. Interessanti anche le scelte linguistiche e stilistiche avverse al Davanzati sostenute da Galeani Napione nel tradurre Tacito. Translating tacitus’ “agricola” during napoleonic era: the case of f. G. Galeani Napione The article considers origin, context and characteristics of the translation of Tacitus’ Agricola by the Piedmontese sometime politician and scholar G.F. Galeani Napione: it was published in 1806, that is, during a period when the invasion of England by France still seemed imminent. The extensive preface and afterword of the translation indirectly but clearly reveal Anglophile and anti-Napoleonic positions, completely in accordance with Galeani Napione noted stance. He worked as a scholar (without political role) at the Turin Academy of Sciences during the annexation of Piedmont by France. Also interesting are Napione’s linguistic and stylistic choices adopted in translating Tacitus, in comparison to the language and style of Bernardo Davanzati, the famous Florentine translator of Tacitus.
description: Italiano LinguaDue, V. 12 N. 2 (2020)
How wing compliance drives the efficiency of self-propelled flapping flyers
Creators: name: Thiria, Benjamin
name: Godoy-Diana, Ramiro
Publisher: name: arXiv
Year: 2010
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Wing flexibility governs the flying performance of flapping wing flyers. Here, we use a self-propelled flapping-wing model mounted on a ``merry go round'' to investigate the effect of wing compliance on the propulsive efficiency of the system. Our measurements show that the elastic nature of the wings can lead not only to a substantial reduction in the consumed power, but also to an increment of the propulsive force. A scaling analysis using a flexible plate model for the wings points out that, for flapping flyers in air, the time-dependent shape of the elastic bending wing is governed by the wing inertia. Based on this prediction, we define the ratio of the inertial forces deforming the wing to the elastic restoring force that limits the deformation as the \emph{elasto-inertial number} $\mathcal{N}_{ei}$. Our measurements with the self-propelled model confirm that it is the appropriate structural parameter to describe flapping flyers with flexible-wings.
description: 4 pages
EURHINODELPHINIDS FROM THE EARLY MIOCENE OF PERU: FIRST UNAMBIGUOUS RECORDS OF THESE HYPER-LONGIROSTRINE DOLPHINS OUTSIDE THE NORTH ATLANTIC REALM
Creators: name: LAMBERT, OLIVIER
name: DE MUIZON, CHRISTIAN
name: VARAS-MALCA, RAFAEL M.
name: URBINA, MARIO
name: BIANUCCI, GIOVANNI
Publisher: name: RIVISTA ITALIANA DI PALEONTOLOGIA E STRATIGRAFIA
Year: 2021

description: Among the many hyper-longirostrine dolphins (Odontoceti) from the Miocene, members of the family Eurhinodelphinidae bear two highly distinctive cranial features: a long and edentulous premaxillary portion of the rostrum and a mandible that is significantly shorter than the rostrum. Until now, unambiguously attributed members of this clade were only recorded from early to middle Miocene deposits of the North Atlantic realm (east coast U.S.A., North Sea Basin, and Mediterranean). In this work we describe and compare two partial skulls of longirostrine dolphins from late early Miocene (Burdigalian, 19.25-18 Ma) marine deposits of the Chilcatay Formation, in the East Pisco Basin (southern coast of Peru), preserving rostral and mandibular material, as well as ear bones. Based on these specimens we report diagnostic remains attributable to this family for the first time for the whole Southern Hemisphere and the whole Pacific Ocean. This major expansion of eurhinodelphinids' palaeogeographic distribution contrasts with their proposed shallow-water, coastal environments; it suggests a new dispersal route for members of the family across the Central American Seaway; and it further highlights the similarities between the odontocete faunas of the southeastern Pacific and North Atlantic realm during the Miocene. Better-preserved eurhinodelphinid specimens from the odontocete-rich Chilcatay Formation will allow for a more detailed comparison with North Atlantic members of the family.
description: RIVISTA ITALIANA DI PALEONTOLOGIA E STRATIGRAFIA , V. 127 N. 1 (2021)
Constraining the runaway dilaton and quintessential dark energy
Creators: name: Neupane, Ishwaree P.
name: Trowland, Holly
Publisher: name: arXiv
Year: 2009
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Dark Energy is some of the weirdest and most mysterious stuff in the universe that tends to increase the rate of expansion of the universe. Two commonly known forms of dark energy are the cosmological constant, a constant energy density filling space homogeneously, and scalar fields such as quintessence or moduli whose energy density can vary with time. We explore one particular model for dynamic dark energy; quintessence driven by a scalar dilaton field. We propose an ansatz for the form of the dilaton field, $|ϕ(a)|/m_P \equiv α_1 \ln t+ α_2 t^n=α\ln a+ β\, a^{2ζ}$, where $a$ is the scale factor and $α$ and $ζ$ are parameters of the model. This phenomenological ansatz for $ϕ$ can be motivated by generic solutions of a scalar dilaton field in many effective string theory and string-inspired gravity models in four dimensions. Using a compilation of current data including type Ia supernovae, we impose observational constraints on the slope parameters like $α$ and $ζ$ and then discuss the relation of our results to analytical constrains on various cosmological parameters, including the dark energy equation of state. Sensible constraints are imposed on model parameters like $α$ and $ζ$ as well as on the dark energy/dark matter couplings using results from structure formation. The constraints of this model are shown to encompass the cosmological constant limit within $1σ$ error bars.
description: 32 pages, several eps figures; refs added, matches published version
Ab-initio calculation of all-optical time-resolved calorimetry of nanosized systems: Evidence of nanosecond-decoupling of electron and phonon temperatures
Creators: name: Banfi, F.
name: Pressacco, F.
name: Revaz, B.
name: Giannetti, C.
name: Nardi, D.
name: Ferrini, G.
name: Parmigiani, F.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The thermal dynamics induced by ultrashort laser pulses in nanoscale systems, i.e. all-optical time-resolved nanocalorimetry is theoretically investigated from 300 to 1.5 K. We report ab-initio calculations describing the temperature dependence of the electron-phonon interactions for Cu nanodisks supported on Si. The electrons and phonons temperatures are found to decouple on the ns time scale at 10 K, which is two orders of magnitude in excess with respect to that found for standard low-temperature transport experiments. By accounting for the physics behind our results we suggest an alternative route for overhauling the present knowledge of the electron-phonon decoupling mechanism in nanoscale systems by replacing the mK temperature requirements of conventional experiments with experiments in the time-domain.
description: 5 pages, 3 figures. Accepted on Physical Review B.
Gravitomagnetic effects in Kerr-de Sitter space-time
Creators: name: Iorio, Lorenzo
name: Ruggiero, Matteo Luca
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: We explicitly worked out the orbital effects induced on the trajectory of a test particle by the the weak-field approximation of the Kerr-de Sitter metric. It results that the node, the pericentre and the mean anomaly undergo secular precessions proportional to k, which is a measure of the non linearity of the theory. We used such theoretical predictions and the latest observational determinations of the non-standard precessions of the perihelia of the inner planets of the Solar System to put a bound on k getting k <= 10^-29 m^-2. The node rate of the LAGEOS Earth's satellite yields k <= 10^-26 m^-2. The periastron precession of the double pulsar PSR J0737-3039A/B allows to obtain k <= 3 10^-21 m^-2. Interpreting k as a cosmological constant Λ, it turns out that such constraints are weaker than those obtained from the Schwarzschild-de Sitter metric.
description: Latex2e, 18 pages, 1 table, no figures. To appear in Journal of Cosmology and Astroparticle Physics (JCAP)
Spontaneous Vortex Production in Driven Condensates with Narrow Feshbach Resonances
Creators: name: Lin, Chi-Yong
name: Lee, Da-Shin
name: Rivers, Ray J.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We explore the possibility that, at zero temperature, vortices can be created spontaneously in a condensate of cold Fermi atoms, whose scattering is controlled by a narrow Feshbach resonance, by rapid magnetic tuning from the BEC to BCS regime. This could be achievable with current experimental techniques.
description: 6 pages, 2 figure, This updated version reaches the same conclusions as its predecessor, but references and explanations are extended
Quantum walk approach to search on fractal structures
Creators: name: Agliari, Elena
name: Blumen, Alexander
name: Muelken, Oliver
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study continuous-time quantum walks mimicking the quantum search based on Grover's procedure. This allows us to consider structures, that is, databases, with arbitrary topological arrangements of their entries. We show that the topological structure of the database plays a crucial role by analyzing, both analytically and numerically, the transition from the ground to the first excited state of the Hamiltonian associated with different (fractal) structures. Additionally, we use the probability of successfully finding a specific target as another indicator of the importance of the topological structure.
description: 15 pages, 14 figures
Splitting dynamics of giant vortices in dilute Bose-Einstein condensates
Creators: name: Kuopanportti, Pekko
name: Möttönen, Mikko
Publisher: name: arXiv
Year: 2009
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We study the splitting of multiply quantized vortices with large quantum numbers in dilute nonrotated Bose-Einstein condensates in the zero-temperature limit. The splitting is observed to result in vortex-free condensate fragments which are separated by vortex sheets. The number of these fragments is found to be equal to the angular-momentum quantum number of the Bogoliubov excitation mode responsible for the splitting, although the formulation of the fragments cannot be described by small-amplitude excitations. Thus, the realization of an isolated giant vortex and the observation of its splitting would provide a means to directly relate the experimental data to discrete theoretical quantities.
description: 8 pages, 6 figures (color)
Distribution of complexities in the Vai script
Creators: name: Rovenchak, Andrij
name: Mačutek, Ján
name: Riley, Charles
Publisher: name: arXiv
Year: 2008
Subjects: subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: In the paper, we analyze the distribution of complexities in the Vai script, an indigenous syllabic writing system from Liberia. It is found that the uniformity hypothesis for complexities fails for this script. The models using Poisson distribution for the number of components and hyper-Poisson distribution for connections provide good fits in the case of the Vai script.
description: 13 pages
Update of Euclidean windows of the hadronic vacuum polarization
Creators: name: Blum, Thomas
name: Boyle, P. A.
name: Bruno, Mattia
name: Giusti, Davide
name: Gülpers, Vera
name: Hill, Ryan
name: Izubuchi, T.
name: Jang, Yong-Chull
name: Jin, L.
name: Jung, C.
name: Jüttner, A.
name: Kelly, C.
name: Lehner, Christoph
name: Matsumoto, Nobuyuki
name: Mawhinney, Robert
name: Meyer, Aaron S.
name: Tsang, Justus Tobias
Publisher: name: Universität Regensburg
Year: 2023
Subjects: subject: 530 Physik

description: We compute the standard Euclidean window of the hadronic vacuum polarization using multiple independent blinded analyses. We improve the continuum and infinite-volume extrapolations of the dominant quark-connected light-quark isospin-symmetric contribution and address additional subleading systematic effects from sea-charm quarks and residual chiral-symmetry breaking from first principles. We find aWμ=235.56(65)(50)×10−10, which is in 3.8σ tension with the recently published dispersive result of aWμ=229.4(1.4)×10−10 [G. Colangelo, A. X. El-Khadra, M. Hoferichter, A. Keshavarzi, C. Lehner, P. Stoffer, and T. Teubner, Phys. Lett. B 833, 137313 (2022)] and in agreement with other recent lattice determinations. We also provide a result for the standard short-distance window. The results reported here are unchanged compared to our presentation at the Edinburgh workshop of the g-2 Theory Initiative in 2022 [C. Lehner, Talk Presented at the 5th Plenary Meeting of the g-2 Theory Initiative in Edinburgh (2022)].
Moduli stacks of stable toric quasimaps
Creators: name: Ciocan-Fontanine, Ionut
name: Kim, Bumsig
Publisher: name: arXiv
Year: 2009
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14D20, 14D23, 14M25, 14N35

description: We construct new "virtually smooth" modular compactifications of spaces of maps from nonsingular curves to smooth projective toric varieties. They generalize Givental's compactifications, when the complex structure of the curve is allowed to vary and markings are included, and are the toric counterpart of the moduli spaces of stable quotients introduced by Marian, Oprea, and Pandharipande to compactify spaces of maps to Grassmannians. A brief discussion of the resulting invariants and their (conjectural) relation with Gromov-Witten theory is also included.
description: Published version
Emission and absorption studies of octahedral chromium (III) complexes
Creators: name: Witzke, Horst
Publisher: name: University of British Columbia
Year: 2011

description: I.The luminescence spectra of a number of molecular Cr(III) complexes have been investigated using standard low-temperature spectroscopic techniques. The observed transitions have been assigned, assuming octahedral micro-symmetry, as emission from either the lowest lying doublet state, ²Eg, or the lowest lying quartet state, ⁴T₂g. An empirical classification is proposed which allows one to predict whether a given complex will show phosphorescence or fluorescence at low temperatures. In general, complexes with relatively high ligand field strengths show only phosphorescence because the ²Eg state lies far below the zeroth level of the ⁴T₂g. state. Compounds with relatively weak ligand field strengths have the ⁴T₂g state as their lowest excited state and therefore show only fluorescence. Complex ions with intermediate ligand fields may emit from both levels since the latter lie within a few hundred wavenumbers of each other. The phosphorescence spectra are sharp and show vibrational structure. A line coincident in energy in absorption and emission identifies the origin of the ²Eg ↔ ⁴A₂g transitions. As these spin-forbidden transitions are intra-configurational (in the strong field limit), the vibration structure in emission and absorption is very similar, although a true mirror image relationship is not realized. In many cases the vibrational spacings have been correlated with known infra-red data. The fluorescence emission is broad and shows no vibrational structure. The ⁴T₂g ↔ ⁴A₂g transitions are inter-configurational and the emission maximum is Stokes-shifted by a few thousand wavenumbers from the absorption maximum, as expected. II. The methods that have been used in the past to derive the electron repulsion parameters, B and C, from the spectra of octahedral Cr(III) complexes have been reinvestigated. A number of Cr(III) complexes were chosen for which the spin-forbidden transitions to the three lowest doublet states are known. The complete strong field and weak field matrices have been used to derive the parameters B and C from the known spectral data. A convenient graphical method is given which makes it a simple matter to choose the "best" values of B and C. The assumption that C=4B was discarded because it is incompatible with the nephelauxetic effect. The three parameter (Δ, B, C) crystal field theory reproduces the band positions of the d-d transitions of most Cr(III) complexes to within a few hundred wavenumbers. Because the free ion theory of Condon and Shortley involves about the same uncertainty, it is felt that the results obtained here represent the best that can be obtained from the three parameter crystal field theory.
The B_{s0} meson and the B_{s0}B K coupling from QCD sum rules
Creators: name: Bracco, M. E.
name: Nielsen, M.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We evaluate the mass of the $B_{s0}$ scalar meson and the coupling constant in the $B_{s0} B K$ vertex in the framework of QCD sum rules. We consider the $B_{s0}$ as a tetraquark state to evaluate its mass. We get $m_{B_s0}=(6.04\pm 0.08) \GeV$, which is bigger than predictions supposing it as a $b\bar{s}$ state or a $B\bar{K}$ bound state with $J^{P}=0^+$. To evaluate the $g_{B_{s0}B K}$ coupling we use the three point correlation functions of the vertex, considering $ B_{s0} $ as a normal $b\bar{s}$ state. The obtained coupling constant is: $g_{B_{s0} B K} =(16.3 \pm 3.2) \GeV$. This number is in agreement with light-cone QCD sum rules calculation. We have also compared the decay width of the $\BS\to BK$ process considering the $\BS$ to be a $b\bar{s}$ state and a $BK$ molecular state. The width obtained for the $BK$ molecular state is twice as big as the width obtained for the $b\bar{s}$ state. Therefore, we conclude that with the knowledge of the mass and the decay width of the $\BS$ meson, one can discriminate between the different theoretical proposals for its structure.
description: revised version to appear in Phys. Rev. D
Condensates in Quantum Chromodynamics and the Cosmological Constant
Creators: name: Brodsky, Stanley J.
name: Shrock, Robert
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Casher and Susskind have noted that in the light-front description, spontaneous chiral symmetry breaking in quantum chromodynamics (QCD) is a property of hadronic wavefunctions and not of the vacuum. Here we show from several physical perspectives that, because of color confinement, quark and gluon QCD condensates are associated with the internal dynamics of hadrons. We discuss condensates using condensed matter analogues, the AdS/CFT correspondence, and the Bethe-Salpeter/Dyson-Schwinger approach for bound states. Our analysis is in agreement with the Casher and Susskind model and the explicit demonstration of "in-hadron" condensates by Roberts et al., using the Bethe-Salpeter/Dyson-Schwinger formalism for QCD bound states. These results imply that QCD condensates give {\it zero} contribution to the cosmological constant, since all of the gravitational effects of the in-hadron condensates are already included in the normal contribution from hadron masses.
description: Expanded and combined version of e-Prints arXiv:0803.2554 and arXiv:0803.2541. To be published in PNAS (Proceedings of the National Academy of Sciences)
Studying the phase diagram of the three-flavor Schwinger model in the presence of a chemical potential with measurement- and gate-based quantum computing
Creators: name: Schuster, Stephan
name: Kühn, Stefan
name: Funcke, Lena
name: Hartung, Tobias
name: Pleinert, Marc-Oliver
name: von Zanthier, Joachim
name: Jansen, Karl
Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2024
Subjects: potential: chemical
hardware: quantum
computer: quantum
critical phenomena
variational quantum eigensolver
quantum device
Schwinger model
capture
ground state
superconductivity
quantum circuit
Monte Carlo
lattice field theory
Hamiltonian formalism
Hilbert space
spin
Gauss law
Pauli
renormalization
boundary condition

description: We propose an ansatz quantum circuit for the variational quantum eigensolver (VQE), suitable for exploring the phase structure of the multi-flavor Schwinger model in the presence of a chemical potential. Our ansatz is capable of incorporating relevant model symmetries via constrains on the parameters, and can be implemented on circuit-based as well as measurement-based quantum devices. We show via classical simulation of the VQE that our ansatz is able to capture the phase structure of the model, and can approximate the ground state to a high level of accuracy. Moreover, we perform proof-of-principle simulations on superconducting, gate-based quantum hardware. Our results show that our approach is suitable for current gate-based quantum devices, and can be readily implemented on measurement-based quantum devices once available.
Invariance of simultaneous similarity and equivalence of matrices under extension of the ground field
Creators: name: Pazzis, Clement de Seguins
Publisher: name: arXiv
Year: 2009
Subjects: subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 15A21; 12F99

description: We give a new and elementary proof that simultaneous similarity and simultaneous equivalence of families of matrices are invariant under extension of the ground field, a result which is non-trivial for finite fields and first appeared in a paper of Klinger and Levy.
description: 10 pages (minor corrections)
Gravity Academy & Gravity Pedagogy
Creators: name: Panzera, Andrea
Publisher: name: Zenodo
Year: 2022
Subjects: Refugee; Immigrant; Social Exclusion

description: Gravity Academy & Gravity Pedagogy Small paragraphs regarding the philosophy of Gravity Academy & Gravity Pedagogy's thesis.
description: A minimalist test of Andrea Panzera's work.
description: {"references": ["Del Carmen Salazar, M. (2013). A Humanizing Pedagogy: Reinventing the Principles and Practice of Education as a Journey Toward Liberation.\u00a0Review of Research in Education,\u00a037, p.121. http://www.jstor.org/stable/24641959"]}
Short review of the relationship between videomusic and art
Creators: name: Napoli, Maria Donata
Publisher: name: Journal of Science and Technology of the Arts
Year: 2012

description: This brief review explores the evolving relationship between the music and the image up to newer art forms. From the experimental cinema of the early 20th century, among other things related to music and to the attempts to sound the filmic image, to the success and flooding of, at first, the cinematic image and then the television image (with the production of countless musical and music related movies in the first case, with the creation of TV networks dedicated to the "music to see" in the second), up to their assimilation and processing in the artistic field, today it happens to witness the neutralization of all the examples of union between music and image because of excessive audio-visual production. In this situation, the art can, as in the past, intervene to bring out the quality of the music or the visual, or both in real complete works, by renewing the language and elevating it from a subculture level to a more authoritative one, as well as "positive" for new art markets
description: Journal of Science and Technology of the Arts, v. 4 n. 1 (2012)
Thermal and Magnetic Quantum Discord in Heisenberg models
Creators: name: Werlang, T.
name: Rigolin, Gustavo
Publisher: name: arXiv
Year: 2009
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate how the quantum correlations (quantum discord) of a two-qubit one dimensional XYZ Heisenberg chain in thermal equilibrium depends on the temperature (T) of the bath and also on an external magnetic field B. We show that the behavior of the thermal quantum discord (QD) differs in many unexpected ways from the thermal entanglement. For example, we show situations where QD increases with T when entanglement decreases, cases where QD increases with T even in regions with zero entanglement, and that QD signals a quantum phase transition even at finite T. We also show that by properly tuning B or the interaction between the qubits we get non-zero QD for any T and we present a new effect not seen for entanglement, the regrowth of thermal QD.
description: 4 pages, 5 figures, RevTex, double column; v2: published version
Acoustic detection of Red-capped Manakin (Ceratopipra mentalis) in Sarapiquí, Costa Rica.
Creators: name: Vargas-Masís, Roberto
name: Segura-Sequeira, David
name: Mendoza-Garro, Emelin
name: Vargas-López, Dania
Publisher: name: Zenodo
Year: 2021
Subjects: Manakin
Acoustic detection
Random forest
Pattern matchine
Conservation

description: Most of the vast biodiversity of the Caribbean foothills of Costa Rica is poorly studied. Passive acoustic monitoring is useful for collecting large datasets of wildlife and apply them for conservation initiatives, but handling these large datasets can be impractical if automated detection algorithms are not applied to reduce labeling time. The use of Pattern Machine (PM) and Random Forest Models (RFM) helps to identify single species though a dataset, simplifying the work. We sampled a private reserve in the Caribbean foothills of Costa Rica with 10 Audiomoth recorders. We used PM and RFM to label the presence of the Red-capped Manakin (Ceratopipra mentalis) in the recordings based on a portion of its distinctive vocalization. The RFM scored 0.86 of accuracy and 0.82 of precision to detect the species within the recordings. Three sites showed the highest number of detections. The acoustic activity of the bird got three different peaks during the day. The peak of detections took place in March. Based on the results, we recommended several conservation actions to the reserve on how to reduce the impact of tourism in the trails and how to rehabilitate the landscape with assistance of the bird and its activity as seed disperser.
description: 2021 3rd IEEE International Conference on BioInspired Processing (BIP)
A Metal-biased Planet Search
Creators: name: Jenkins, J. S.
name: Jones, H. R. A.
name: Barnes, J. R.
name: Pavlenko, Y.
name: Rojo, P.
name: Jones, M. I.
name: Day-Jones, A. C.
name: Pinfield, D. J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have begun a metal-rich planet search project using the HARPS instrument in La Silla, Chile to target planets with a high potential to transit their host star and add to the number of bright benchmark transiting planets. The sample currently consists of 100, bright (7.5 = V = 9.5) solar-type stars (0.5 = B-V = 0.9) in the southern hemisphere which are both inactive (logR'HK = -4.5) and metal-rich ([Fe/H] >/= 0.1 dex). We determined the chromospheric activity and metallicity status of our sample using high resolution FEROS spectra. We also introduce the first result from our HARPS planet search and show that the radial-velocity amplitude of this star is consistent with an orbiting planetary-mass companion (i.e. Msini < 0.5MJ) with a period of ~5 days. We are currently engaged in follow-up to confirm this signal as a bonafide orbiting planet.
description: 4 pages, 3 figures, to appear in the proceedings of the Cool Stars 15 conference
Kazhdan quotients of Golod-Shafarevich groups
Creators: name: Ershov, Mikhail
name: Jaikin-Zapirain, Andrei
Publisher: name: arXiv
Year: 2009
Subjects: subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 20F05, 20F69 (Primary), 20E18, 20F65, 22D10, 43A07 (Secondary)

description: The main goal of this paper is to prove that every Golod-Shafarevich group has an infinite quotient with Kazhdan's property $(T)$. In particular, this gives an affirmative answer to the well-known question about non-amenability of Golod-Shafarevich groups.
description: 38 pages, final preprint version (slightly different from the published version)
Graphene Nanoengineering and the Inverse-Stone-Thrower-Wales Defect
Creators: name: Lusk, Mark T.
name: Wu, David T.
name: Carr, L. D.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We analyze a new fundamental building block for monolithic nanoengineering on graphene: the Inverse-Stone-Thrower-Wales (ISTW) defect. The ISTW is formed from a pair of joined pentagonal carbon rings placed between a pair of heptagonal rings; the well-known Stone-Thrower-Wales (STW) defect is the same arrangement, but with the heptagonal rather than pentagonal rings joined. When removed and passivated with hydrogen, the structure constitutes a new molecule, diazulene, which may be viewed as the result of an ad-dimer defect on anthracene. Embedding diazulene in the honeycomb lattice, we study the effect of ad-dimers on planar graphene. Because the ISTW defect has yet to be experimentally identified, we examine several synthesis routes and find one for which the barrier is only slightly higher than that associated with adatom hopping on graphene. ISTW and STW defects may be viewed as fundamental building blocks for monolithic structures on graphene. We show how to construct extended defect domains on the surface of graphene in the form of blisters, bubbles, and ridges on a length scale as small as 2 angstroms by 7 angstroms. Our primary tool in these studies is density functional theory.
description: 10 pages, 13 figures
On type II_0 E_0-semigroups induced by boundary weight doubles
Creators: name: Jankowski, Christopher
Publisher: name: arXiv
Year: 2009
Subjects: subject: Operator Algebras (math.OA)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 46L57 (Primary), 46L55 (Secondary)

description: Powers has shown that each spatial E_0-semigroup can be obtained from the boundary weight map of a CP-flow acting on B(K \otimes L^2(0, \infty)) for some separable Hilbert space K. In this paper, we define boundary weight maps through boundary weight doubles (ϕ, ν), where ϕ: M_n(\C) \to M_n(\C) is a q-positive map and νis a boundary weight over L^2(0, \infty). These doubles induce CP-flows over K for 11, n \in \mathbb{N}.
description: 38 pages; numbering format changed; various typos corrected; journal reference added
Ejercicios resueltos de tecnología electrónica (componentes pasivos)
Creators: name: Castellano, Jerónimo Quesada
Publisher: name: Zenodo
Year: 2020
Subjects: Componentes pasivos
Resistor
Capacitor
Components

description: Ejercicios resueltos sobre resistores lineales y no lineales y condensadores utilizados en la docencia de la asignatura Tecnología Electrónica, del grado en Ingeniería Electrónica Industrial y Automática en la Escuela de Ingeniería de Vitoria-Gasteiz
description: {"references": ["R. \u00c1lvarez Santos: Materiales y componentes electr\u00f3nicos pasivos, EDITESA, Madrid, 1996."]}