cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Fractional quantum Hall states at zero magnetic field
Creators: name: Neupert, Titus
name: Santos, Luiz
name: Chamon, Claudio
name: Mudry, Christopher
Publisher: name: arXiv
Year: 2010
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We present a simple prescription to flatten isolated Bloch bands with non-zero Chern number. We first show that approximate flattening of bands with non-zero Chern number is possible by tuning ratios of nearest-neighbor and next-nearest neighbor hoppings in the Haldane model and, similarly, in the chiral-pi-flux square lattice model. Then we show that perfect flattening can be attained with further range hoppings that decrease exponentially with distance. Finally, we add interactions to the model and present exact diagonalization results for a small system at 1/3 filling that support (i) the existence of a spectral gap, (ii) that the ground state is a topological state, and (iii) that the Hall conductance is quantized.
description: 4 pages, 2 figures
Dirac spinors in Bianchi-I f(R)-cosmology with torsion
Creators: name: Vignolo, Stefano
name: Fabbri, Luca
name: Cianci, Roberto
Publisher: name: arXiv
Year: 2011
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study Dirac spinors in Bianchi type-I cosmological models, within the framework of torsional $f(R)$-gravity. We find four types of results: the resulting dynamic behavior of the universe depends on the particular choice of function $f(R)$; some $f(R)$ models do not isotropize and have no Einstein limit, so that they have no physical significance, whereas for other $f(R)$ models isotropization and Einsteinization occur, and so they are physically acceptable, suggesting that phenomenological arguments may select $f(R)$ models that are physically meaningful; the singularity problem can be avoided, due to the presence of torsion; the general conservation laws holding for $f(R)$-gravity with torsion ensure the preservation of the Hamiltonian constraint, so proving that the initial value problem is well-formulated for these models.
description: 25 pages, 1 figure
Unusual gas sensor response and semiconductor-to-insulator transition in WO3-x nanostructures : The role of oxygen vacancy
Creators: name: Ganesan, K.
name: Ajikumar, P. K.
Publisher: name: arXiv
Year: 2025
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: WO3-x thinfilms featuring petal-like and lamella-like nanostructures are grown under controlled oxygen partial pressures using hot filament chemical vapor deposition. These synthesized WO3-x nanostructures exhibit monoclinic structure and contain a significant amount of oxygen vacancies (VO) as confirmed by X-ray diffraction and Raman spectroscopy, respectively. These WO3-x nanostructures demonstrate sensor response to both NH3 and NO2 gases even at room temperature. However, the sensor response varies with temperature and analyte gas type. For NH3, the sensors exhibit an increase in resistance behaving like a p-type semiconductor at temperatures below 150 0C while the resistance decreases at higher temperatures, resembling n-type semiconductor behavior. On the other hand, below 150 0C, these sensors display n-type behavior towards NO2 but act like p-type semiconductor at higher temperatures. Further temperature dependent transport studies were performed in these WO3-x nanostructures in the temperature range from 25 to 300 oC, after inducing additional VO in the films through annealing under CH4. The petal-like WO3-x nanostructures display an abrupt change in resistance, indicating insulator-to-semiconductor and semiconductor-to-insulator transitions during heating and cooling cycles respectively, in the temperature range of 100 - 212 0C. In lamella-like WO3-x nanostructures, the resistance is flipped from semiconductor-to-insulator at 300 0C and remains insulating state when cooled down to 30 0C. The abnormal gas sensing behavior and insulator - semiconductor transition is discussed in terms of VO in WO3-x nanostructures.
description: 26 pages, 9 figures; Accepted in Surfaces and Interfaces (2025)
Non-Newtonian Couette-Poiseuille flow of a dilute gas
Creators: name: Tij, Mohamed
name: Santos, Andrés
Publisher: name: arXiv
Year: 2010
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences
subject: 76P05, 82B40, 82C40, 82C05

description: The steady state of a dilute gas enclosed between two infinite parallel plates in relative motion and under the action of a uniform body force parallel to the plates is considered. The Bhatnagar-Gross-Krook model kinetic equation is analytically solved for this Couette-Poiseuille flow to first order in the force and for arbitrary values of the Knudsen number associated with the shear rate. This allows us to investigate the influence of the external force on the non-Newtonian properties of the Couette flow. Moreover, the Couette-Poiseuille flow is analyzed when the shear-rate Knudsen number and the scaled force are of the same order and terms up to second order are retained. In this way, the transition from the bimodal temperature profile characteristic of the pure force-driven Poiseuille flow to the parabolic profile characteristic of the pure Couette flow through several intermediate stages in the Couette-Poiseuille flow are described. A critical comparison with the Navier-Stokes solution of the problem is carried out.
description: 24 pages, 5 figures; v2: discussion on boundary conditions added; 10 additional references. Published in a special issue of the journal "Kinetic and Related Models" dedicated to the memory of Carlo Cercignani
Serapias ×ambigua Rouy ex E.G.Camus, nuove segnalazioni per il Lazio (Italia centrale)
Creators: name: Romieg Soca
Publisher: name: Zenodo
Year: 2009
Subjects: Serapias
Lazio
Italia

description: Souche R., Gransinigh E. & Buono S. 2009. Serapias ×ambigua Rouy ex E.G.Camus, nuove segnalazioni per il Lazio (Italia centrale). GIROS Notizie 42: 23-25.
Holographic Superfluidity in Imbalanced Mixtures
Creators: name: Erdmenger, Johanna
name: Grass, Viviane
name: Kerner, Patrick
name: Ngo, Thanh Hai
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We construct superfluid black hole solutions with two chemical potentials. By analogy with QCD, the two chemical potentials correspond to the baryon and isospin symmetries, respectively. We consider two systems: the back-reacted U(2) Einstein-Yang-Mills theory in 4+1 dimensions and the 9+1-dimensional D3/D7 brane setup with two coincident D7-brane probes. In the D7-brane model, the identification of baryon and isospin chemical potential is explicit since the dual field theory is explicitly known. Studying the phase diagram, we find in both systems a quantum phase transition at a critical ratio of the two chemical potentials. However the quantum phase transition is different in the two systems: In the D3/D7 brane setup we always find a second order phase transition, while in the Einstein-Yang-Mills theory, depending on the strength of the back-reaction, we obtain a continuous or first order transition. We expect the continuous quantum phase transition to be BKT-like. We comment on the origin of this differing behavior in these apparently very similar models and compare to phenomenological systems.
description: 33 pages, 10 pdf files in 6 figures, v2: Discussion of D3/D7 setup at zero temperature revised
Spontaneous nucleation of structural defects in inhomogeneous ion chains
Creators: name: De Chiara, Gabriele
name: del Campo, Adolfo
name: Morigi, Giovanna
name: Plenio, Martin B.
name: Retzker, Alex
Publisher: name: arXiv
Year: 2010
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Structural defects in ion crystals can be formed during a linear quench of the transverse trapping frequency across the mechanical instability from a linear chain to the zigzag structure. The density of defects after the sweep can be conveniently described by the Kibble-Zurek mechanism. In particular, the number of kinks in the zigzag ordering can be derived from a time-dependent Ginzburg-Landau equation for the order parameter, here the zigzag transverse size, under the assumption that the ions are continuously laser cooled. In a linear Paul trap the transition becomes inhomogeneous, being the charge density larger in the center and more rarefied at the edges. During the linear quench the mechanical instability is first crossed in the center of the chain, and a front, at which the mechanical instability is crossed during the quench, is identified which propagates along the chain from the center to the edges. If the velocity of this front is smaller than the sound velocity, the dynamics becomes adiabatic even in the thermodynamic limit and no defect is produced. Otherwise, the nucleation of kinks is reduced with respect to the case in which the charges are homogeneously distributed, leading to a new scaling of the density of kinks with the quenching rate. The analytical predictions are verified numerically by integrating the Langevin equations of motion of the ions, in presence of a time-dependent transverse confinement. We argue that the non-equilibrium dynamics of an ion chain in a Paul trap constitutes an ideal scenario to test the inhomogeneous extension of the Kibble-Zurek mechanism, which lacks experimental evidence to date.
description: 19 pages, 5 figures
Estimating Pre- and Post-Selected Ensembles
Creators: name: Massar, Serge
name: Popescu, Sandu
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In analogy with the usual state estimation problem, we introduce the problem of state estimation for a pre- and post-selected ensemble. The problem has fundamental physical significance since, as argued by Y. Aharonov and collaborators, pre- and post-selected ensembles are the most basic quantum ensembles. Two new features are shown to appear: 1) information is flowing to the measuring device both from the past and from the future; 2)because of the post-selection, certain measurement outcomes can be forced never to occur. Due to these features, state estimation in such ensembles is dramatically different from the case of ordinary, pre-selected only ensembles. Here we develop a general theoretical framework for studying this problem, and illustrate it through several examples. We also prove a general theorem showing that information flowing from the future is related to the complex conjugate information flowing from the past. We emphasize that all state estimation problems can be extended to the pre- and post-selected situation. The present work thus lays the foundations of a much more general theory of quantum state estimation.
description: 10 pages
Stability of spin-0 graviton and strong coupling in Horava-Lifshitz theory of gravity
Creators: name: Wang, Anzhong
name: Wu, Qiang
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this paper, we consider two different issues, stability and strong coupling, raised lately in the newly-proposed Horava-Lifshitz (HL) theory of quantum gravity with projectability condition. We find that all the scalar modes are stable in the de Sitter background, due to two different kinds of effects, one from high-order derivatives of the spacetime curvature, and the other from the exponential expansion of the de Sitter space. Combining these effects properly, one can make the instability found in the Minkowski background never appear even for small-scale modes, provided that the IR limit is sufficiently closed to the relativistic fixed point. At the fixed point, all the modes become stabilized. We also show that the instability of Minkowski spacetime can be cured by introducing mass to the spin-0 graviton. The strong coupling problem is investigated following the effective field theory approach, and found that it cannot be cured by the Blas-Pujolas-Sibiryakov mechanism, initially designed for the case without projectability condition, but might be circumvented by the Vainshtein mechanism, due to the non-linear effects. In fact, we construct a class of exact solutions, and show explicitly that it reduces smoothly to the de Sitter spacetime in the relativistic limit.
description: Some points regarding to strong coupling are further clarified, and typos corrected. revtex4, 9 figures. Version to appear in Physical Reviews D
[Postcard, 1962 February 9, New York, N.Y., to Ellen Borden Stevenson, Chicago, Ill. ]: [manuscript]
Creators: name: (:Unav)
Publisher: name: Columbia University
Year: 1962

description: Typescript postcard signed, from E. E. Cummings, 4 Patchin Place, New York City, to Ellen Borden Stevenson, 65 East Bellevue Place, Chicago, Ill., declining an invitation and describing his and Marion Morehouse's efforts to retain occupancy at their Patchin Place residence
Scaling Small für ein gemeinnütziges scholar-led OA-Ökosystem für Buchpublikationen
Creators: name: Steiner, Tobias
Publisher: name: Zenodo
Year: 2021
Subjects: open access
OA monograph
community-led
open infrastructures
Open Book Collective

description: Das Open Access-Publikationswesen befindet sich aktuell insbesondere im Bereich von Buchpublikationen in einer Phase des Umbruchs. Während von Wissenschaftler*innen geführte, so genannte scholar-led Verlage schon länger die Etablierung innovativer Publikationsmodellen vorantreiben, beginnen nun auch große Universitätsverlage sowie kommerzielle Verlage damit, OA-Buchpublikationen ernst zu nehmen. Der sich abzeichnende Trend zu "Big Deals" und "transformativen" Vereinbarungen hat das Potenzial, die bestehende Vielfalt an akademisch geführten, nicht profitorientierten Verlagsinitiativen noch stärker an den Rand zu drängen und damit kollektiv-geführte Initiativen wie das ScholarLed-Konsortium oder die Radical Open Access Collective zu bedrohen.

 Der "Scaling Small"-Ansatz (Adema & Moore, 2021) stellt hier eine alternative Vision zu der drohenden Zukunft eines monopolistisch-monopsonistischen Publikationswesens in Aussicht. Das “Scaling Small"-Prinzip formt den Kern von COPIM, eines internationalen Verbundprojekts, welches Bibliotheken, scholar-led Open-Access-Verlage, Forschende und OA-Infrastrukturanbieter zusammenbringt, um auf ein nachhaltiges, pluralistisches, gemeinnütziges Publikationsökosystem hinzuwirken.

 COPIM arbeitet an der Überwindung der wichtigsten technologischen, strukturellen und organisatorischen Hürden, um ein solches Ökosystem zu verwirklichen. Dazu zählen: die Entwicklung eines gemeinnützigen Plattform-Kollektivs zum effizienten Informations- und Umsatzmanagement zwischen Verlagen, Bibliotheken und Infrastrukturanbietern. Die Plattform wird als Informationsportal zu OA-Buchpublikationen im Allgemeinen sowie insbesondere den im Kollektiv vertretenen non-profit scholar-led OA-Initiativen und deren Publikationen gedacht. die Etablierung neuer Finanzierungsmodelle abseits von BPCs, darunter Opening the Future, welches interessierten Verlagen den Übergang zu Non-BPC-OA ermöglicht; die forschungsgeleitete Adaption von für gemeinnützige, community-gesteuerte digitale Infrastrukturen geeignete Governance-Modelle; die Entwicklung von Thoth, einem open source Multiformat-Metadatensystem zur strukturierten Erstellung und Verbreitung von Metadaten für OA-Buchpublikationen; die explorative Erforschung experimenteller digitaler, offener Buchveröffentlichungspraktiken; technische und rechtliche Lösungen zur effizienten Archivierung und Langzeitbewahrung komplexer digitaler Forschungspublikationen. Wir nähern uns der Halbzeit unseres Projekts und möchten mit dieser Präsentation Einblicke in unsere schon erreichten Ziele sowie weiterführende Schritte geben und dabei skizzieren, wie COPIM den "Scaling Small"-Ansatz in die Tat umsetzt.
description: Community-led Open Publishing Infrastructures for Monographs (COPIM) is supported by the Research England Development (RED) Fund, and Arcadia—a charitable fund of Lisbet Rausing and Peter Baldwin.
Willmore minimizers with prescribed isoperimetric ratio
Creators: name: Schygulla, Johannes
Publisher: name: arXiv
Year: 2011
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics

description: Motivated by a simple model for elastic cell membranes, we minimize the Willmore functional among two-dimensional spheres embedded in R^3 with prescribed isoperimetric ratio.
Untersuchungen zum Seilsägeprozess an Stählen ausgewählter Geometrien im umschlingenden Verfahren
Creators: name: Knecht, Daniel
Publisher: name: Karlsruhe
Year: 2015
Subjects: Seilsäge

description: Die vorliegende Dissertation beschreibt ein neues Modell zur Vorhersage der Schnittzeit und des Verschleißes für das umschlingende Seilsägeverfahren. Hierzu wurden die verschiedenen Einflussfaktoren in unterschiedlichen Versuchsreihen ermittelt und ausgewertet. Mit diesem neuen Modell ist es möglich, innerhalb definierter Randbedingungen zuverlässige Vorhersagen zur Schnittzeit und dem resultierenden Verschleiß zu machen.
Erlangen Programme at Large: An Overview
Creators: name: Kisil, Vladimir V.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Complex Variables (math.CV)
subject: Mathematical Physics (math-ph)
subject: Functional Analysis (math.FA)
subject: Representation Theory (math.RT)
subject: Quantum Physics (quant-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 30G35, 22E46, 30F45, 32F45, 43A85, 30G30, 42C40, 46H30, 47A13, 81R30, 81R60

description: This is an overview of Erlangen Programme at Large. Study of objects and properties, which are invariant under a group action, is very fruitful far beyond the traditional geometry. In this paper we demonstrate this on the example of the group SL(2,R). Starting from the conformal geometry we develop analytic functions and apply these to functional calculus. Finally we link this to quantum mechanics and conclude by a list of open problems. Keywords: Special linear group, Hardy space, Clifford algebra, elliptic, parabolic, hyperbolic, complex numbers, dual numbers, double numbers, split-complex numbers, Cauchy-Riemann-Dirac operator, Möbius transformations, functional calculus, spectrum, quantum mechanics, non-commutative geometry
description: 77 pages, AMS-LaTeX, 12 figures (29 EPS graphic files); v2: section on QM was extended
Apparent multiple Delta m^2_32 in muon anti-neutrino and muon neutrino survival oscillations from non-standard interaction matter effect
Creators: name: Mann, W. Anthony
name: Cherdack, Daniel
name: Musial, Wojciech
name: Kafka, Tomas
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Neutrinos propagating through matter may participate in forward coherent neutral-current-like scattering arising from non-standard interactions as well as from the Mikheyev-Smirnov-Wolfenstein matter potential $V_e$. We show that at fixed long baselines through matter of constant density, the non-standard interaction potential $ε_{μτ} V_e$ can contribute an additional term to the oscillation phase whose sign differs for $\anumu$ versus $\numu$ propagation in matter. Its presence can cause different apparent $Δm^2$ to be erroneously inferred on the basis of oscillations in vacuum, with values lying above (for $\anumu$) or below (for $\numu$) the actual $Δm^2_{32}$ for the case where $ε_{μτ}$ is predominantly real-valued and of sign opposite to $Δm_{32}^2$. An NSI scenario invoking only $\Re(ε_{μτ})$ is shown to be capable of accounting for a disparity recently reported between oscillation survival for $\anumu$ and $\numu$ fluxes measured at $735~\mathrm{km}$ by the MINOS experiment. Implications for mantle traversal by atmospheric neutrinos are examined. The NSI matter potential with non-maximal mixing could evade conventional atmospheric neutrino analyses which do not distinguish $\numu$ from $\anumu$ on an event-by-event basis.
description: 7 pages, 5 figures. Accepted for publication in Physical Review D
Phase separation in thermal systems: LB study and morphological characterization
Creators: name: Gan, Yanbiao
name: Xu, Aiguo
name: Zhang, Guangcai
name: Li, Yingjun
Publisher: name: arXiv
Year: 2010
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We investigate thermal and isothermal symmetric liquid-vapor separations via a FFT-Thermal Lattice Boltzmann (FFT-TLB) model. Structure factor, domain size and Minkowski functionals are employed to characterize the density and velocity fields as well as to understand the configurations and the kinetic processes. Compared with the isothermal phase separation, the freedom in temperature prolongs the Spinodal Decomposition (SD) stage and induces different rheological and morphological behaviors in the thermal system. After the transient procedure, both the thermal and isothermal separations show power-law scalings in domain growth; while the exponent for thermal system is lower than that for isothermal system. With respect to the density of field, the isothermal system presents more likely bicontinuous configurations with narrower interfaces, while the thermal system presents more likely configurations with scattered bubbles. Heat creation, conduction and lower interfacial stresses are main reasons for the differences in thermal system. Different from the case with isothermal phase separation, the release of latent heat causes the changing of local temperature which results in new local mechanical balance. When the Prandtl number becomes smaller, the system approaches thermodynamical equilibrium more quickly. The increasing of mean temperature makes lower the interfacial stress in the following way: $σ=σ_{0}[(T_{c}-T)/(T_{c}-T_{0})]^{3/2}$, where $T_{c}$ is the critical temperature and $σ_{0}$ is the interfacial stress at a reference temperature $T_{0}$, which is the main reason for lower growth exponent in thermal case.
description: 35 pages, 15 figures
"I became a woman through my words" : the Indigenous feminist writing of Lee Maracle and Beth Brant
Creators: name: Cowan, Victoria
Publisher: name: University of British Columbia
Year: 2017

description: This thesis examines the short story collections and auto/biographical, self-reflexive works of Lee Maracle (Stó:lō) and Beth Brant (Mohawk), arguing that the multi-generic nature of both writers’ work constitutes it as Indigenous feminist theory. Although Indigenous women’s writing continues to be marginalized in (white) academic contexts, their writing is not necessarily undertheorized in their own literary communities—indeed, this thesis understands Indigenous women’s writing as inherently theoretical because it analyzes the interdependent systems of racist and sexist oppression brought to bear on Indigenous women. Put differently, Indigenous women writing about their lived experiences constitutes theory. Both Maracle and Brant intervene in form and content as a refusal to be fixed by the heteropatriarchal, colonial gaze. On a formal level, Maracle draws on her conceptualization of “oratory,” a Stó:lō methodology for holistically engaging with written texts, to create hybrid, multi-generic written forms. Brant, on the other hand, writes across genres as a gesture of inclusivity to the multiple, marginalized communities she writes to and for; even more, her multi-generic writing mimics her intersectional Indigenous feminist praxis. On the level of content, both writers demonstrate that a firm division between their writing and their political concerns does not exist: Maracle’s writing on violence against Indigenous women, other-than-human beings, and the earth coincide with her political advocacy off the page, and the centrality of queer Indigenous and Two Spirit characters and desire in Brant’s writing speaks to its political necessity in larger heteronormative contexts. Reading these two authors alongside each other thus enables a fuller conceptualization of the theoretical power of Indigenous feminist writing as a decolonial methodology.
Using CASiMiR-vegetation model to establish riparian vegetation disturbance requirements
Creators: name: Rivaes, Rui
name: Egger, Gregory
name: Pinheiro, António
name: Ferreira, Teresa
Publisher: name: Karlsruhe
Year: 2015
Subjects: riparian vegetation
flow regime
river disturbance
vegetation modeling
river restoration

description: The disturbance requirements of riparian vegetation were determined in two Mediterranean rivers based on riparian vegetation modeling. The assessment of the riparian vegetation disturbance requirements were consistent in selecting the best disturbance regime. Such outcome may suggest the probable applicability of this approach to rivers in general and the possibility to preserve artificially the sustainability of the riparian communities in regulated rivers.
Secret Sharing LDPC Codes for the BPSK-constrained Gaussian Wiretap Channel
Creators: name: Wong, Chan Wong
name: Wong, Tan F.
name: Shea, John M.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Information Theory (cs.IT)
subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: The problem of secret sharing over the Gaussian wiretap channel is considered. A source and a destination intend to share secret information over a Gaussian channel in the presence of a wiretapper who observes the transmission through another Gaussian channel. Two constraints are imposed on the source-to-destination channel; namely, the source can transmit only binary phase shift keyed (BPSK) symbols, and symbol-by-symbol hard-decision quantization is applied to the received symbols of the destination. An error-free public channel is also available for the source and destination to exchange messages in order to help the secret sharing process. The wiretapper can perfectly observe all messages in the public channel. It is shown that a secret sharing scheme that employs a random ensemble of regular low density parity check (LDPC) codes can achieve the key capacity of the BPSK-constrained Gaussian wiretap channel asymptotically with increasing block length. To accommodate practical constraints of finite block length and limited decoding complexity, fixed irregular LDPC codes are also designed to replace the regular LDPC code ensemble in the proposed secret sharing scheme.
description: submitted to IEEE Trans. on Information Forensics and Security, special issues on using the physical layer for securing the next generation of communication systems
Joint IMOTHEP / CAJU workshop on Hybrid Electric Propulsion - AMBER
Creators: name: Milli, A.
Publisher: name: Zenodo
Year: 2023
Subjects: IMOTHEP
aviation
greenaviation
HEP
H2020Transport
H2020
HorizonEurope
CINEA
CAJU
climatechange
EU

description: Presentation at the Joint IMOTHEP / CAJU workshop on Hybrid Electric Propulsion (HEP) at Eurocontrol in Brussels (B) on 29 & 30 November 2023.
Construction of optimal witness for unknown two-qubit entanglement
Creators: name: Park, H. S.
name: Lee, S. -S. B.
name: Kim, H.
name: Choi, S. -K.
name: Sim, H. -S.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Whether entanglement in a state can be detected, distilled, and quantified without full state reconstruction is a fundamental open problem. We demonstrate a new scheme encompassing these three tasks for arbitrary two-qubit entanglement, by constructing the optimal entanglement witness for polarization-entangled mixed-state photon pairs without full state reconstruction. With better efficiency than quantum state tomography, the entanglement is maximally distilled by newly developed tunable polarization filters, and quantified by the expectation value of the witness, which equals the concurrence. This scheme is extendible to multiqubit Greenberger-Horne-Zeilinger entanglement.
description: Phys. Rev. Lett. 105, 230404 (2010); supplementary information (OWitness_sup.pdf) is included in source zip file
A Brachistochrone Approach to Reconstruct the Inflaton Potential
Creators: name: Wohns, Daniel
name: Xu, Jiajun
name: Tye, S. -H. Henry
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We propose a new way to implement an inflationary prior to a cosmological dataset that incorporates the inflationary observables at arbitrary order. This approach employs an exponential form for the Hubble parameter $H(ϕ)$ without taking the slow-roll approximation. At lowest non-trivial order, this $H(ϕ)$ has the unique property that it is the solution to the brachistochrone problem for inflation.
description: 13 pages, 2 figures, version matches published version
Rectification in Y-junctions of Luttinger liquid wires
Creators: name: Wang, Chenjie
name: Feldman, D. E.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We investigate rectification of a low-frequency ac bias in Y-junctions of one-channel Luttinger liquid wires with repulsive electron interaction. Rectification emerges due to three scatterers in the wires. We find that it is possible to achieve a higher rectification current in a Y-junction than in a single wire with an asymmetric scatterer at the same interaction strength and voltage bias. The rectification effect is the strongest in the absence of the time-reversal symmetry. In that case, the maximal rectification current can be comparable with the total current $\sim e^2V/h$ even for low voltages, weak scatterers and modest interaction strength. In a certain range of low voltages, the rectification current can grow as the voltage decreases. This leads to a bump in the $I$-$V$ curve.
description: 14 pages, 4 figures; The latest version
Quantum-Classical Crossover and Apparent Metal-Insulator Transition in a Weakly Interacting 2D Fermi Liquid
Creators: name: Zhou, Xiaoqing
name: Schmidt, B.
name: Proust, C.
name: Gervais, G.
name: Pfeiffer, L. N.
name: West, K. W.
name: Sarma, S. Das
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We report the observation of a parallel magnetic field induced metal-insulator transition (MIT) in a high-mobility two-dimensional electron gas (2DEG) for which spin and localization physics most likely play no major role. The high-mobility metallic phase at low field is consistent with the established Fermi liquid transport theory including phonon scattering, whereas the insulating phase at higher field shows a large negative temperature dependence at resistances much smaller than the quantum of resistance, $h/e^2$. We argue that this observation is a direct manifestation of a quantum-classical crossover arising predominantly from the magneto-orbital coupling between the finite width of the 2DEG and the in-plane magnetic field.
description: 4 pages, 2 figures
Drill-seeding of soybean
Creators: name: Bykova, Olha
name: Rittler, Leopold
Publisher: name: Zenodo
Year: 2021
Subjects: soybean
seed drill
seeding

description: Farmers are very familiar with the conventional seed drill for sowing cereals. This practice note outlines how this standard farm equipment can be also successfully used in soybean production. Good crop establishment is the key to high soybean yields. Practical experience has shown that drill seeders are suitable for achieving high yields. Drill seeders sow in narrow rows which contribute to an early canopy closure which increases the competitiveness of the crop against weeds and reduces the risk of soil erosion.
Associated production of light gravitinos in e^+e^- and e^-γcollisions
Creators: name: Mawatari, K.
name: Oexl, B.
name: Takaesu, Y.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Light gravitino productions in association with a neutralino (selectron) in e^+e^- (e^-γ) collisions are restudied in a scenario that the lightest supersymmetric particle is a gravitino and the produced neutralino (selectron) promptly decays into a photon (electron) and a gravitino. We explicitly give the helicity amplitudes for the production processes by using the effective goldstino interaction Lagrangian, and present the cross sections with different collision energies and mass spectra. We also examine selection efficiencies by kinematical cuts and beam polarizations for the signal and background processes, and show that the energy and angular distributions of the photon (electron) can explore the mass of the t-channel exchange particle as well as the mass of the decaying particle at a future e^+e^- (e^-γ) collider.
description: 12 pages, 12 figures, 4 tables; references added, version to appear in EPJC
Some functional inequalities on polynomial volume growth Lie groups
Creators: name: Chamorro, Diego
Publisher: name: arXiv
Year: 2010
Subjects: subject: Analysis of PDEs (math.AP)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics

description: We study in this article some Sobolev-type inequalities on polynomial volume growth Lie groups. We show in particular that improved Sobolev inequalities can be extended without the use of the Littlewood-Paley decomposition to this general framework.
Reconfigurable Gradient Index using VO2 Memory Metamaterials
Creators: name: Goldflam, M. D.
name: Driscoll, T.
name: Chapler, B.
name: Khatib, O.
name: Jokerst, N. Marie
name: Palit, S.
name: Smith, D. R.
name: Kim, Bong-Jun
name: Seo, Giwan
name: Kim, Hyun-Tak
name: Di Ventra, M.
name: Basov, D. N.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We demonstrate tuning of a metamaterial device that incorporates a form of spatial gradient control. Electrical tuning of the metamaterial is achieved through a vanadium dioxide layer which interacts with an array of split ring resonators. We achieved a spatial gradient in the magnitude of permittivity, writeable using a single transient electrical pulse. This induced gradient in our device is observed on spatial sc ales on the order of one wavelength at 1 THz. Thus, we show the viability of elements for use in future devices with potential applications in beamforming and communications
description: 4 pages, 3 figures
ERKIN VOHIDOV IJODIDA ANTONIM BIRLIKLARNING QO'LLANILISHI
Creators: name: Shamiddinova Qurbonoy Jamoliddin qizi O'zMU o'zbek fiologiya fakulteti Matnshunoslik va adabiy manbashunoslik yo'nalishi 2-bosqich talabasi
Publisher: name: Zenodo
Year: 2023

description: Har qanday adib yoki ijodkor o'z ijodi jarayonida asarlarining ifodali, jozibali xalq ruhiga hamohang bo'lishini ta'minlash asnosida, shu xalqning, millatning ruhiga mos so'z tushunchalarni tanlaydi. Biz ham ushbu maqolada E.Vohidov ijodida qo 'llanilgan antonimlarni tadqiq qilganmiz.
Kalit so'zlar: Antonim, g'azal, uslub, lirik she'r, aruz, qasida, vazn.
Adiabatic multicritical quantum quenches: Continuously varying exponents depending on the direction of quenching
Creators: name: Mukherjee, Victor
name: Dutta, Amit
Publisher: name: arXiv
Year: 2010
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study adiabatic quantum quenches across a quantum multicritical point (MCP) using a quenching scheme that enables the system to hit the MCP along different paths. We show that the power-law scaling of the defect density with the rate of driving depends non-trivially on the path, i.e., the exponent varies continuously with the parameter $α$ that defines the path, up to a critical value $α= α_c$; on the other hand for $α\geq α_c$, the scaling exponent saturates to a constant value. We show that dynamically generated and {\it path($α$)-dependent} effective critical exponents associated with the quasicritical points lying close to the MCP (on the ferromagnetic side), where the energy-gap is minimum, lead to this continuously varying exponent. The scaling relations are established using the integrable transverse XY spin chain and generalized to a MCP associated with a $d$-dimensional quantum many-body systems (not reducible to two-level systems) using adiabatic perturbation theory. We also calculate the effective {\it path-dependent} dimensional shift $d_0(α)$ (or the shift in center of the impulse region) that appears in the scaling relation for special paths lying entirely in the paramagnetic phase. Numerically obtained results are in good agreement with analytical predictions.
description: 5 pages, 4 figures
Dynamical instability and loss of p-band bosons in optical lattices
Creators: name: Martikainen, J. -P.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We study how the bosonic atoms on the excited p-band of an optical lattice are coupled to the lowest s-band and the 2nd excited d-band. We find that in some parameter regimes the atom-atom interactions can cause a dynamical instability of the p-band atoms towards decay to the s- and d-bands. Furthermore, even when dynamical instability is not expected s- and d-bands can become substantially populated.
description: 7 figures, minor changes to the earlier version
Fermi-surface reconstruction in a smectic phase of a high temperature superconductor
Creators: name: Yao, Hong
name: Lee, Dung-Hai
name: Kivelson, Steven A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: It is shown that, in the presence of a moderately strong C_4 symmetry breaking (which could be produced either by lattice orthorhombicity or the presence of an electron nematic phase), a weak, period 4, unidirectional charge density wave ("charge stripe") order can reconstruct the Fermi surface of a typical hole-doped cuprate to produce a small electron pocket. This form of charge density wave order is consistent with that adduced from recent high field NMR experiments in YBCO. The Fermi pocket has an area and effective mass which is a rough caricature of those seen in recent high field quantum oscillation experiments.
description: 4 pages, 2 figures, minor changes
The evolving Glasma
Creators: name: Fukushima, Kenji
name: Gelis, Francois
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We extensively study the growing behavior of the energy and the pressure components depending on the space-time rapidity in the framework of the Glasma, which describes the early-time dynamics in the ultra-relativistic heavy-ion collisions. We simulate the Glasma solving the classical equations of motion in the SU(2) Yang-Mills theory and systematically investigate the dependence of the Glasma instability on the model parameters. We have checked that the transverse and longitudinal grid sizes in our simulation are large enough to handle cutoff effects under control. By comparing the numerical results from several initial conditions with different magnitudes of instability seed and also those with different wave-numbers for rapidity fluctuations, we clearly see that unstable modes dominantly grow up in the linear regime and we also confirm non-linear effects in the time evolution. To extract more detailed information on the evolving Glasma, we decompose the energy into the components in terms of rapidity wave-numbers. We observe an energy flow from low wave-number modes into higher wave-number modes due to non-linearity in the equations of motion. We find that the energy spectrum approaches an asymptotic scaling that is consistent with Kolmogorov's power-law form even in the expanding system of the Glasma.
description: 29 pages, 18 figures, discussions on the non-linear regime and the power-law spectrum added, version accepted for publication in Nucl.Phys.A
Superfluid Turbulence: Nonthermal Fixed Point in an Ultracold Bose Gas
Creators: name: Nowak, Boris
name: Sexty, Dénes
name: Gasenzer, Thomas
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Nonthermal fixed points of far-from-equilibrium dynamics of a dilute degenerate Bose gas are analysed in two and three spatial dimensions. For such systems, universal power-law distributions, previously found within a nonperturbative quantum-field theoretic approach, are shown to be related to vortical dynamics and superfluid turbulence. The results imply an interpretation of the momentum scaling at the nonthermal fixed points in terms of independent vortex excitations of the superfluid. Long-wavelength acoustic excitations on the top of these are found to follow a non-thermal power law. The results shed light on fundamental aspects of superfluid turbulence and have strong potential implications for related phenomena studied, e.g., in early-universe inflation or quark-gluon plasma dynamics.
description: 5 pages, 5 figures
Defect Modes and Homogenization of Periodic Schrödinger Operators
Creators: name: Hoefer, M. A.
name: Weinstein, M. I.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Mathematical Physics (math-ph)
subject: Analysis of PDEs (math.AP)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We consider the discrete eigenvalues of the operator $H_\eps=-Δ+V(\x)+\eps^2Q(\eps\x)$, where $V(\x)$ is periodic and $Q(\y)$ is localized on $\R^d,\ \ d\ge1$. For $\eps>0$ and sufficiently small, discrete eigenvalues may bifurcate (emerge) from spectral band edges of the periodic Schrödinger operator, $H_0 = -Δ_\x+V(\x)$, into spectral gaps. The nature of the bifurcation depends on the homogenized Schrödinger operator $L_{A,Q}=-\nabla_\y\cdot A \nabla_\y +\ Q(\y)$. Here, $A$ denotes the inverse effective mass matrix, associated with the spectral band edge, which is the site of the bifurcation.
description: 26 pages, 3 figures, to appear SIAM J. Math. Anal
Fast Magnetic Reconnection and Spontaneous Stochasticity
Creators: name: Eyink, Gregory L.
name: Lazarian, Alex
name: Vishniac, Ethan T.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Magnetic field-lines in astrophysical plasmas are expected to be frozen-in at scales larger than the ion gyroradius. The rapid reconnection of magnetic flux structures with dimensions vastly larger than the gyroradius requires a breakdown in the standard Alfvén flux-freezing law. We attribute this breakdown to ubiquitous MHD plasma turbulence with power-law scaling ranges of velocity and magnetic energy spectra. Lagrangian particle trajectories in such environments become "spontaneously stochastic", so that infinitely-many magnetic field-lines are advected to each point and must be averaged to obtain the resultant magnetic field. The relative distance between initial magnetic field lines which arrive to the same final point depends upon the properties of two-particle turbulent dispersion. We develop predictions based on the phenomenological Goldreich & Sridhar theory of strong MHD turbulence and on weak MHD turbulence theory. We recover the predictions of the Lazarian & Vishniac theory for the reconnection rate of large-scale magnetic structures. Lazarian & Vishniac also invoked "spontaneous stochasticity", but of the field-lines rather than of the Lagrangian trajectories. More recent theories of fast magnetic reconnection appeal to microscopic plasma processes that lead to additional terms in the generalized Ohm's law, such as the collisionless Hall term. We estimate quantitatively the effect of such processes on the inertial-range turbulence dynamics and find them to be negligible in most astrophysical environments. For example, the predictions of the Lazarian-Vishniac theory are unchanged in Hall MHD turbulence with an extended inertial range, whenever the ion skin depth $δ_i$ is much smaller than the turbulent integral length or injection-scale $L_i.$
description: 31 pages, 5 figures
Simulating quantum systems on the Bethe lattice by translationally invariant infinite-Tree Tensor Network
Creators: name: Nagy, Adam
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We construct an algorithm to simulate imaginary time evolution of translationally invariant spin systems with local interactions on an infinite, symmetric tree. We describe the state by symmetric iPEPS and use translation-invariant operators for the updates at each time step. The contraction of this tree tensor network can be computed efficiently by recursion without approximations and one can then truncate all the iPEPS tensors at the same time. The translational symmetry is preserved at each time step that makes the algorithm very well conditioned and stable. The computational cost scales like $O(D^{q+1})$ with the bond dimension $D$ and coordination number $q$, much favourable than that of the iTEBD on trees [D. Nagaj et al. Phys. Rev. B \textbf{77}, 214431 (2008)]. Studying the transverse-field Ising model on the Bethe lattice, we find a second order phase transition with finite correlation lengths.
description: final version, to be published in Annals of Physics
AUDIO-VISUAL SCENES REPOSITORY: HOW TO CONTRIBUTE
Creators: name: Hladek, Lubos
name: van de Par, Steven
name: Ewert, Stephan D.
name: Seeber, Bernhard U.
Publisher: name: Zenodo
Year: 2021
Subjects: acoustics, audiology, virtual reality, audio-visual scene

description: This document defines the scope of the Audiovisual scenes repository and set the requirements for the contributors. The document provides guidance for creating and documenting an audiovisual environment that suitable for hearing research and which can be published in this repository. The document further explains how to perform acoustic measurements and provides concrete examples of the formats of the submission.
description: Funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) – Projektnummer 352015383 – SFB 1330, Project C5.
Sharing qualitative research data
Creators: name: Mania, Joanna
name: Klapwijk, Eduard
Publisher: name: Zenodo
Year: 2023
Subjects: research data management
qualitative data
data access
anonymization

description: Short presentation about challenges and practices for sharing qualitative research data for the EUR Data Coffee Breaks at Erasmus University Rotterdam. Presented December 7 & 18, 2023
(previous version presented October 13 & 24, 2022 at the ESSB Data Coffee Breaks at the Erasmus School for Social and Behavioural Sciences)