cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Quasinormal modes of Gauss-Bonnet-AdS black holes: towards holographic description of finite coupling
Creators: name: Konoplya, R. A.
name: Zhidenko, A.
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Here we shall show that there is no other instability for the Einstein-Gauss-Bonnet-anti-de Sitter (AdS) black holes, than the eikonal one and consider the features of the quasinormal spectrum in the stability sector in detail. The obtained quasinormal spectrum consists from the two essentially different types of modes: perturbative and non-perturbative in the Gauss-Bonnet coupling $α$. The sound and hydrodynamic modes of the perturbative branch can be expressed through their Schwazrschild-AdS limits by adding a linear in $α$ correction to the damping rates: $ω\approx Re(ω_{SAdS}) - Im(ω_{SAdS}) (1 - α\cdot ((D+1) (D-4) /2 R^2)) i$, where $R$ is the AdS radius. The non-perturbative branch of modes consists of purely imaginary modes, whose damping rates unboundedly increase when $α$ goes to zero. When the black hole radius is much larger than the anti-de Sitter radius $R$, the regime of the black hole with planar horizon (black brane) is reproduced. If the Gauss-Bonnet coupling $α$ (or used in holography $λ_{GB}$) is not small enough, then the black holes and branes suffer from the instability, so that the holographic interpretation of perturbation of such black holes becomes questionable, as, for example, the claimed viscosity bound violation in the higher derivative gravity. For example, $D=5$ black brane is unstable at $|λ_{GB}|>1/8$ and has anomalously large relaxation time when approaching the threshold of instability.
description: 22 pages, JHEP style
Two Roads to Classicality
Creators: name: Coecke, Bob
name: Selby, John
name: Tull, Sean
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Mixing and decoherence are both manifestations of classicality within quantum theory, each of which admit a very general category-theoretic construction. We show under which conditions these two 'roads to classicality' coincide. This is indeed the case for (finite-dimensional) quantum theory, where each construction yields the category of C*-algebras and completely positive maps. We present counterexamples where the property fails which includes relational and modal theories. Finally, we provide a new interpretation for our category-theoretic generalisation of decoherence in terms of 'leaking information'.
description: In Proceedings QPL 2017, arXiv:1802.09737
Hemispherical Power Asymmetry of the Cosmic Microwave Background from a Remnant of a pre-Inflationary Topological Defect
Creators: name: Yang, Qiaoli
name: Liu, Yunqi
name: Di, Haoran
Publisher: name: arXiv
Year: 2016
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Observations indicate that large-scale anomalies exist in the fluctuations of the cosmic microwave background. In these anomalies, the hemispherical power amplitude asymmetry has a correlation length comparable to that of the observable universe. We propose that a topological defect created by spontaneous breaking of the U(1) symmetry prior to inflation generated an initial phase variation, $δθ$, across the observable region of the universe. The amplitude of this phase fluctuation is protected by topology if the defect is inside the horizon, and is frozen by causality if the defect exits the horizon. After inflation, the phase-corresponding boson field started to oscillate, when the Hubble rate decreased to a level comparable to the mass of the boson field. The energy density of the newly created boson particles varied across the observable universe. The bosons subsequently decayed into radiation prior to the BBN epoch, and the resulting fluctuations in the energy density produced the observed power asymmetry. This scenario predicts a scale-dependent modulation amplitude power asymmetry and in addition, as topological defects created by phase transitions are a very general phenomenon, the observed hemispherical asymmetry may be seen as an evidence for the cosmological inflation.
description: 16 pages, 2 figures; published in Phys. Rev. D
IFZ news Sommer 2015
Creators: name: (:Unkn) Unknown
name: Justus Liebig University Giessen
Publisher: name: Universitätsbibliothek Gießen
Year: 2015
Subjects: subject: ddc:570

description: Ausgestorben geglaubte Wildbienenart wiederentdeckt - IFZ awards 2014 - Emmy Noether Gruppe zur Entstehung von Arthybriden - Wie Pathogene das Immunsystem von Pflanzen manipulieren - Interdisziplinäre Forschung für effizienteren Naturschutz - Außenminister Steinmeier besucht CEMarin - Koordinierte Forschung in Antarktis und Arktis - EU fördert Forschungen am Asiatischen Marienkäfer - Biosphere IFZ: Der Tabakschwärmer
IFZ news Winter 2015
Creators: name: (:Unkn) Unknown
name: Justus Liebig University Giessen
Publisher: name: Universitätsbibliothek Gießen
Year: 2015
Subjects: subject: ddc:570

description: Neues Institut für Insektenbiotechnologie bei Besuch des Ministerpräsidenten vorgestellt - Böden als Regulatoren in Agrarökosystemen - Marie-Sklodowska-Curie-Netzwerk zur Getreideforschung - Projektkooperation zur Diversität schwedischer Schäreninseln - Erweiterung der Plattform zur Wirkungsbezogenen Analytik - Divertracking - Neuer Artenrekord der Namibia-Exkursion - Biosphere iFZ: Bakterien in Pilzen in Pflanzen
title: Otsingu- ja päästetööd piiriveekogul lennuõnnetuste korral
Creators: name: Lindsaar, Inge
Publisher: name: Tallinn: Sisekaitseakadeemia
Year: 2022
Subjects: classificationCode: 5
subject: FOS: Social sciences

description: Mõttepaberi eesmärk on anda ülevaade valmisolekust reageerida nii merealadel kui ka piiriveekogul toimunud lennuõnnetusele. Eestis juhib praegu merealal toimunud õnnetuse korral otsingu- ja päästetöid Politsei- ja Piirivalveamet (PPA), kes kasutab selleks kogu olemasolevat vastava väljaõppe saanud inim- ja tehnilist ressurssi: veesõidukeid ja koptereid. Samuti juhib PPA piiriveekogul lennuõnnetuse otsingu- ja päästetööde korraldamist. 1. jaanuaril 2023 toimuv PPA ja kaitseväe laevastike liitmine muudab praegust olukorda märkimisväärselt.

 Võtmesõnad/Keywords: päästetööd; päästeotsingud; piiriveekogud; lennuõnnetused; rescue operations; rescue searches; air accidents; transboundary watercourses; maritime rescue
description: Sissejuhatus ; Eestis aset leidnud lennuõnnetuste lühiülevaade ; Märkimisväärsed juhtumid Eesti merepiiril viimase 30 aasta jooksul ; Otsingu- ja päästetööde korraldus lennuõnnetuse korral päästepiirkonnas ja piiriveekogul ; Merepääste planeeritavad arengud ja kavandatav laevastike reform ; Otsingu- ja päästetööde tegemine pärast kavandatavat laevastike liitmist ; Kokkvõte ; Kasutatud allikad
IFZ news Sommer 2014
Creators: name: (:Unkn) Unknown
name: Justus Liebig University Giessen
Publisher: name: Universitätsbibliothek Gießen
Year: 2014
Subjects: subject: ddc:570

description: Insektenbiotechnologie und Bioressourcen - IFZ awards zum zweiten Mal verliehen - *Feldexperiment und prozessorientierte Ökosystemmodellierung - *Redoxpotential-Bestimmung in lebenden Malariaparasiten - *Neuer Blutparasit bei Seevögeln - *Neue Rolle der SREBPs in der Schilddrüsenhormonsynthese - *In aller Kürze - *Ressource Wasser und der Frühstücksrechner im IFZ-Foyer - *Biosphere IFZ: Das " Ocean 2100" Projekt
Shaded Tangles for the Design and Verification of Quantum Programs (Extended Abstract)
Creators: name: Reutter, David
name: Vicary, Jamie
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We give a scheme for interpreting shaded tangles as quantum programs, with the property that isotopic tangles yield equivalent programs. We analyze many known quantum programs in this way -- including entanglement manipulation and error correction -- and in each case present a fully-topological formal verification, yielding in several cases substantial new insight into how the program works. We also use our methods to identify several new or generalized procedures.
description: In Proceedings QPL 2017, arXiv:1802.09737
IFZ news Winter 2014
Creators: name: (:Unkn) Unknown
name: Justus Liebig University Giessen
Publisher: name: Universitätsbibliothek Gießen
Year: 2014
Subjects: subject: ddc:570

description: Rapsgenom entschlüsselt - Mercator-Professur am IFZ - Methanbildung durch Pflanzen - Oberflächenplasmonresonanzspektroskopie - Sanofi öffnet " Schatztruhe" für Insektenbiotechnologie - Molekulare Lichtschalter - Siegerglück bei 1. Science Slam der JLU - Biosphere IFZ: Großes Umtopfen im Wintergarten
Anisotropic homogeneous string cosmology with two-loop corrections
Creators: name: Naderi, F.
name: Rezaei-Aghdam, A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The two-loop (order $α'$) $β$-function equations, which are equivalent to the equations of motion of $α'$-corrected string effective action, are considered for anisotropic homogeneous space-times. These equations are solved for all Bianchi-type models in two schemes of effective action, namely $R^2$ and Gauss-Bonnet schemes with zero cosmological constant and then the metric, dilaton and $B$-field are found at $α'$ perturbative corrections.
description: 33 pages
IFZ news Sommer 2017
Creators: name: (:Unkn) Unknown
name: Justus Liebig University Giessen
Publisher: name: Universitätsbibliothek Gießen
Year: 2017
Subjects: subject: ddc:570

description: Plädoyer für eine neue Agrarpolitik : das ZANEXUS-Projekt am iFZ - Naturstoffe aus Insekten als Leitstrukturen für Medikamente - Steigerung der Phosphateffizienz von Weizen - Medikamente in Boden und Wasser - Genetische Instabilität von synthetischem Raps - iFZ Masters : Preise für nachhaltige Ressourcennutzung 2016 - Fotoausstellung 10 Jahre Namibia-Exkursion der Tierökologie - Klimawandel und Ökologie von Mikroorganismen - Biosphere iFZ: Leben im Spülschwamm
IFZ news Winter 2017/2018
Creators: name: (:Unkn) Unknown
name: Justus Liebig University Giessen
Publisher: name: Universitätsbibliothek Gießen
Year: 2017
Subjects: subject: ddc:570

description: Neue Wege zur Bekämpfung vernachlässigter tropischer Infektionskrankheiten - Translationale Biodiversitätsgenomik - Einfluss von Medikamenten auf die Fauna des Grundwassers - Zukunftsszenarien für georgische Hochgebirgslandschaft - Nachhaltige Klimafolgenforschung in Gießen und Geisenheim - Die unbekannte Welt der kleinen Proteine - Bedrohliche Schönheit - Internationale Tagungen - Biosphere iFZ: Neue Bewohner im Hanggebäude
Hyperbolic and Semi-Hyperbolic Surface Codes for Quantum Storage
Creators: name: Breuckmann, Nikolas P.
name: Vuillot, Christophe
name: Campbell, Earl
name: Krishna, Anirudh
name: Terhal, Barbara M.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We show how a hyperbolic surface code could be used for overhead-efficient quantum storage. We give numerical evidence for a noise threshold of 1.3% for the {4,5}-hyperbolic surface code in a phenomenological noise model (as compared to 2.9% for the toric code). In this code family parity checks are of weight 4 and 5 while each qubit participates in 4 different parity checks. We introduce a family of semi-hyperbolic codes which interpolate between the toric code and the {4,5}-hyperbolic surface code in terms of encoding rate and threshold. We show how these hyperbolic codes outperform the toric code in terms of qubit overhead for a target logical error probability. We show how Dehn twists and lattice code surgery can be used to read and write individual qubits to this quantum storage medium.
description: 28 pages, 21 figures
IFZ news Winter 2013
Creators: name: (:Unkn) Unknown
name: Justus Liebig University Giessen
Publisher: name: Universitätsbibliothek Gießen
Year: 2013
Subjects: subject: ddc:570

description: Ökosysteme der nächsten Generation -*Genombasierte Pflanzenzüchtung -*Evolution und Plastizität von Verhalten -*Umweltfreundliche Schädlingsbekämpfung -*Hot Spots der Biodiversität -*Meerwasserentsalzung mit Sonnenenergie -*Neuer institutioneller Rahmen für Marine Sciences an der JLU -*Biosphere IFZ: Seepferdchen in Not.
Categorical Probabilistic Theories
Creators: name: Gogioso, Stefano
name: Scandolo, Carlo Maria
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Physics (quant-ph)
subject: Category Theory (math.CT)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We present a simple categorical framework for the treatment of probabilistic theories, with the aim of reconciling the fields of Categorical Quantum Mechanics (CQM) and Operational Probabilistic Theories (OPTs). In recent years, both CQM and OPTs have found successful application to a number of areas in quantum foundations and information theory: they present many similarities, both in spirit and in formalism, but they remain separated by a number of subtle yet important differences. We attempt to bridge this gap, by adopting a minimal number of operationally motivated axioms which provide clean categorical foundations, in the style of CQM, for the treatment of the problems that OPTs are concerned with.
description: In Proceedings QPL 2017, arXiv:1802.09737
IFZ news Frühling/Sommer 2008
Creators: name: (:Unkn) Unknown
name: Justus Liebig University Giessen
Publisher: name: Universitätsbibliothek Gießen
Year: 2008
Subjects: subject: ddc:630

description: Energiepflanzen, Wirtschaft und Umwelt -*Wissenschaft und Lebenswelt auch 2008 wieder streIFZüge -*Gesundbrunnen Jauchegrube -*Die Herbstzeitlose: schön, aber giftig -*In Kürze -*Evolution in den Hochanden -*Impulsgeber Bachelor Studierende werden Betriebsführer -*Heimliche Helfer eine neue Nachwuchsgruppe am IFZ -*Eingelesen -*Aufgelesen -*Biosphere IFZ.
A comparative analysis of inflation determinants in Morocco, Turkey, and Egypt using the Backward Elimination and Forward Regression Method
Creators: name: Chaimae EL MORAJJI
name: Abdeslam EL MOUDDEN
Publisher: name: Zenodo
Year: 2024

description: This paper examines the impact of internal and external factors on the inflation rate for three emerging economies, Morocco, Egypt and Turkey. Using annual data, covering the period (2009-2022) after two crises; international financial crisis 2008 and covid’19 crisis. In this study, we use backward elimination and forward regression as econometric methods.

According to our estimation results, the variables that have a significance influence (a degree of significance lower than 0.05) and thus a significant relationship with the inflation rate, namely unemployment rate, exportations and broad money (M3) for Morocco; Real effective exchange rate (REER), external balance, broad money (M3) and Households and NPISHs Final consumption expenditure for Egypt; Importations, key rate, REER and broad money (M3) for Turkey. Consequently, the inflation rate is affected, in the three countries, by internal and external factors. However, when applying the second method, new explanatory variables emerge for Morocco, such as imports, households and NPISHs final consumption expenditure, and exports for Turkey. Overall and upon its findings, it is worth noting that Turkey is the country most affected by inflation, followed by Egypt and, lastly, Morocco.
Precision mass measurements of $^{125-127}$Cd isotopes and isomers approaching the $N=82$ closed shell
Creators: name: Lascar, D.
name: Klawitter, R.
name: Babcock, C.
name: Leistenschneider, E.
name: Stroberg, S. R.
name: Barquest, B. R.
name: Finlay, A.
name: Foster, M.
name: Gallant, A. T.
name: Hunt, P.
name: Kelly, J.
name: Kootte, B.
name: Lan, Y.
name: Paul, S. F.
name: Phan, M. L.
name: Reiter, M. P.
name: Schultz, B.
name: Short, D.
name: Simonis, J.
name: Andreoiu, C.
name: Brodeur, M.
name: Dillmann, I.
name: Gwinner, G.
name: Holt, J. D.
name: Kwiatkowski, A. A.
name: Leach, K. G.
name: Dilling, J.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We present the results of precision mass measurements of neutron-rich cadmium isotopes. These nuclei approach the $N=82$ closed neutron shell and are important to nuclear structure as they lie near doubly-magic $^{132}$Sn on the chart of nuclides. Of particular note is the clear identification of the ground state mass in $^{127}$Cd along with the isomeric state. We show that the ground state identified in a previous mass measurement which dominates the mass value in the Atomic Mass Evaluation is an isomeric state. In addition to $^{127/m}$Cd, we present other cadmium masses measured ($^{125/m}$Cd and $^{126}$Cd) in a recent TITAN experiment at TRIUMF. Finally, we compare our measurements to new \emph{ab initio} shell-model calculations and comment on the state of the field in the $N=82$ region.
description: 8 Pages with citations, 3 Figures, 2 Tables
Toward Steep Slope Cryogenic Transistors for Quantum Computing
Creators: name: Han, Yi
name: Sun, Jingxuan
name: Grützmacher, Detlev
name: Zhao, Qing-Tai
Publisher: name: Forschungzentrum Jülich
Year: 2023

description: 13th International WorkShop on New Group IV Semiconductor Nanoelectronics, Sendai, Japan, 23 Jan 2023 - 24 Jan 2023
Nuclear suppression of $ϕ$ meson yields with large $p_T$ at the RHIC and the LHC
Creators: name: Dai, Wei
name: Chen, Xiao-Fang
name: Zhang, Ben-Wei
name: Zhang, Han-Zhong
name: Wang, Enke
Publisher: name: arXiv
Year: 2017
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We calculate $ϕ$ meson transverse momentum spectra in p+p collisions as well as their nuclear suppressions in central A+A collisions both at the RHIC and the LHC in LO and NLO with the QCD-improved parton model. We have included the parton energy loss effect in hot/dense QCD medium with the effectively medium-modified $ϕ$ fragmentation functions in the higher-twist approach of jet quenching. The nuclear modification factors of $ϕ$ meson in central Au+Au collisions at the RHIC and central Pb+Pb collisions at the LHC are provided, and a nice agreement of our numerical results at NLO with the ALICE measurement is observed. Predictions of yield ratios of neutral mesons such as $ϕ/π^0$, $ϕ/η$ and $ϕ/ρ^0$ at large $p_T$ in relativistic heavy-ion collisions are also presented for the first time.
description: 7 pages, 8 figures
$B_{s}\to K \ell ν_\ell$ and $B_{(s)} \to π(K) \ell^+\ell^-$ decays at large recoil and CKM matrix elements
Creators: name: Khodjamirian, Alexander
name: Rusov, Aleksey V.
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We provide hadronic input for the $B$-meson semileptonic transitions to a light pseudoscalar meson at large recoil. The $B_s\to K$ form factor calculated from QCD light-cone sum rule is updated, to be used for a $|V_{ub}|$ determination from the $B_s\to K \ell ν$ width. Furthermore, we calculate the hadronic input for the binned observables of $B \to π\ell^+ \ell^-$ and $B \to K \ell^+ \ell^-$. In addition to the form factors, the nonlocal hadronic matrix elements are obtained, combining QCD factorization and light-cone sum rules with hadronic dispersion relations. We emphasize that, due to nonlocal effects, the ratio of branching fractions of these decays is not sufficient for an accurate extraction of the $|V_{td}/V_{ts}|$ ratio. Instead, we suggest to determine the Wolfenstein parameters $A,ρ,η$ of the CKM matrix, combining the branching fractions of $B \to K \ell^+ \ell^-$ and $B \to π\ell^+ \ell^-$ with the direct $CP$-asymmetry in the latter decay. We also obtain the hadronic matrix elements for a yet unexplored channel $B_s \to K \ell^+ \ell^-$.
description: 21 pages, 4 figures, 5 tables, a few comments and references addded, version accepted for publication in JHEP
Anisotropy of the astrophysical gravitational wave background: analytic expression of the angular power spectrum and correlation with cosmological observations
Creators: name: Cusin, Giulia
name: Pitrou, Cyril
name: Uzan, Jean-Philippe
Publisher: name: arXiv
Year: 2017
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Unresolved and resolved sources of gravitational waves are at the origin of a stochastic gravitational wave background. While the computation of its mean density as a function of frequency in a homogeneous and isotropic universe is standard lore, the computation of its anisotropies requires to understand the coarse graining from local systems, to galactic scales and then to cosmology. An expression of the gravitational wave energy density valid in any general spacetime is derived. It is then specialized to a perturbed Friedmann-Lemaître spacetime in order to determine the angular power spectrum of this stochastic background as well as its correlation with other cosmological probes, such as the galaxy number counts and weak lensing. Our result for the angular power spectrum also provides an expression for the variance of the gravitational wave background.
description: 22 pages, 2 figures
IFZ news Sommer 2013
Creators: name: (:Unkn) Unknown
name: Justus Liebig University Giessen
Publisher: name: Universitätsbibliothek Gießen
Year: 2013
Subjects: subject: ddc:570

description: Erstmals iFZ awards verliehen -*Vom Bösewicht zum wichtigen Zellregulator -*Biofilme und bakterielle Bewegung -*Regulation des Kohlenhydrat- und Speicherstoffwechsels -*Hochdurchsatz-Sequenzierung im IFZ -*In aller Kürze -*NanoPOP -*Forschung und Lehre fließen im Schwingbach zusammen -*Die Gewinner des Green Vision Contest -*Biosphere IFZ: Wildkräuter im Laborversuch
Many-body interferometry of magnetic polaron dynamics
Creators: name: Ashida, Yuto
name: Schmidt, Richard
name: Tarruell, Leticia
name: Demler, Eugene
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The physics of quantum impurities coupled to a many-body environment is among the most important paradigms of condensed matter physics. In particular, the formation of polarons, quasiparticles dressed by the polarization cloud, is key to the understanding of transport, optical response, and induced interactions in a variety of materials. Despite recent remarkable developments in ultracold atoms and solid-state materials, the direct measurement of their ultimate building block, the polaron cloud, has remained a fundamental challenge. We propose and anlalyze a unique platform to probe time-resolved dynamics of polaron-cloud formation with an interferometric protocol. We consider an impurity atom immersed in a two-component Bose-Einstein condensate, where the impurity generates spin-wave excitations that can be directly measured by the Ramsey interference of surrounding atoms. The dressing by spin waves leads to the formation of magnetic polarons and reveals a unique interplay between few- and many-body physics that is signified by single- and multi-frequency oscillatory dynamics corresponding to the formation of many-body bound states. Finally, we discuss concrete experimental implementations in ultracold atoms.
description: 6+6 pages, 3+2 figures. See also Research highlight [doi:10.1038/s41567-018-0088-x] in Nature Physics
Unexpected 3+ valence of iron in FeO$_2$, a geologically important material lying "in between" oxides and peroxides
Creators: name: Streltsov, S. V.
name: Shorikov, A. O.
name: Skornyakov, S. L.
name: Poteryaev, A. I.
name: Khomskii, D. I.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Recent discovery of pyrite FeO$_2$, which can be an important ingredient of the Earth's lower mantle and which in particular may serve as an extra source of water in the Earth's interior, opens new perspectives for geophysics and geochemistry, but this is also an extremely interesting material from physical point of view. We found that in contrast to naive expectations Fe is nearly 3+ in this material, which strongly affects its magnetic properties and makes it qualitatively different from well known sulfide analogue - FeS$_2$. Doping, which is most likely to occur in the Earth's mantle, makes FeO$_2$ much more magnetic. In addition we show that unique electronic structure places FeO$_2$ "in between" the usual dioxides and peroxides making this system interesting both for physics and solid state chemistry.
Transport properties of an electron-hole bilayer/superconductor hybrid junction
Creators: name: Bercioux, D.
name: Klapwijk, T. M.
name: Bergeret, F. S.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We investigate the transport properties of a junction consisting of an electron-hole bilayer in contact with normal and superconducting leads. The electron-hole bilayer is considered as a semi-metal with two electronic bands. We assume that in the region between the contacts the system hosts an exciton condensate described by a BCS-like model with a gap $Γ$ in the quasiparticle density of states. We first discuss how the subgap electronic transport through the junction is mainly governed by the interplay between two kinds of reflection processes at the interfaces: The standard Andreev reflection at the interface between the superconductor and the exciton condensate, and a coherent crossed reflection at the semi-metal/exciton-condensate interface that converts electrons from one layer into the other. We show that the differential conductance of the junction shows a minimum at voltages of the order of $Γ/e$. Such a minimum can be seen as a direct hallmark of the existence of the gapped excitonic state.
A scale at 10 MeV, gravitational topological vacuum, and large extra dimensions
Creators: name: Aydemir, Ufuk
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We discuss a possible scale of gravitational origin at around $10$ MeV, or $10^{-12}$ cm, which arises in the MacDowell-Mansouri formalism of gravity due to the topological Gauss-Bonnet term in the action, as pointed out by Bjorken several years ago. A length scale of the same size emerges also in the Kodama solution in gravity, which is known to be closely related to the MacDowell-Mansouri formulation. We particularly draw attention to the intriguing incident that existence of six compact extra dimensions originated from TeV-scale quantum gravity as well points to a length scale of $10^{-12}$ cm, as the compactification scale. The presence of six such extra dimensions is also in remarkable consistency with the MacDowell-Mansouri formalism; it provides a possible explanation for the factor of $\sim10^{120}$ multiplying the Gauss-Bonnet term in the action. We also comment on the relevant implications of such a scale regarding the thermal history of the universe motivated by the fact that it is considerably close to $1-2$ MeV below which the weak interactions freeze out, leading to Big Bang Nucleosynthesis.
description: 8 pages. Minor improvements. Slightly more detailed version of the published paper
Global classical solutions of 3D viscous MHD system without magnetic diffusion on periodic boxes
Creators: name: Pan, Ronghua
name: Zhou, Yi
name: Zhu, Yi
Publisher: name: arXiv
Year: 2017
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: In this paper, we study the global existence of classical solutions to the three dimensional incompressible viscous magneto-hydrodynamical system without magnetic diffusion on periodic boxes, i.e., with periodic boundary conditions. We work in Eulerian coordinate and employ a time-weighted energy estimate to prove the global existence result, under the assumptions that the initial magnetic field is close enough to an equilibrium state and the initial data have some symmetries.
description: 24 pages
The new versatile general purpose surface-muon instrument (GPS) based on silicon photomultipliers for $μ$SR measurements on a continuous-wave beam
Creators: name: Amato, A.
name: Luetkens, H.
name: Sedlak, K.
name: Stoykov, A.
name: Scheuermann, R.
name: Elender, M.
name: Raselli, A.
name: Graf, D.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: We report on the design and commissioning of a new spectrometer for muon-spin relaxation/rotation studies installed at the Swiss Muon Source (S$μ$S) of the Paul Scherrer Institute (PSI, Switzerland). This new instrument is essentially a new design and replaces the old general-purpose surface-muon instrument (GPS) which has been for long the workhorse of the $μ$SR user facility at PSI. By making use of muon and positron detectors made of plastic scintillators read out by silicon photomultipliers (SiPMs), a time resolution of the complete instrument of about 160 ps (standard deviation) could be achieved. In addition, the absence of light guides, which are needed in traditionally built $μ$SR instrument to deliver the scintillation light to photomultiplier tubes located outside magnetic fields applied, allowed us to design a compact instrument with a detector set covering an increased solid angle compared to the old GPS.
description: 11 pages, 11 figures
Exorcising Ghosts in Induced Gravity
Creators: name: Narain, Gaurav
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Unitarity of scale-invariant coupled theory of higher-derivative gravity and matter is investigated. A scalar field coupled with dirac fermion is taken as matter sector.Following the idea of induced gravity Einstein-Hilbert term is generated via dynamical symmetry breaking of scale-invariance. The renormalisation group flows are computed and one-loop RG improved effective potential of scalar is calculated. Scalar field develops a new minimum via Coleman-Weinberg procedure inducing Newton's constant and masses in the matter sector. The spin-2 problematic ghost and the spin-0 mode of the metric fluctuation gets a mass in the broken phase of theory. The energy-dependence of VeV in the RG improved scenario implies a running for the induced parameters. This sets up platform to ask whether it is possible to evade the spin-2 ghost by keeping its mass always above the running energy scale? In broken phase this question is satisfactorily answered for a large domain of coupling parameter space where the ghost is evaded. The spin-0 mode can be made physically realisable or not depending upon the choice of initial parameters. Induced Newton's constant is seen to vanishes in ultraviolet. By properly choosing parameters it is possible to make the matter fields physically unrealisable.
description: 47 pages, 18 Figures. Abstract modified, 2 new figures added, 2 figures updated, some new text and new references added, typos corrected and additional subsection included
Light-matter quantum interferometry with homodyne detection
Creators: name: Ruppert, László
name: Filip, Radim
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigated the estimation of an unknown Gaussian process (containing displacement, squeezing and phase-shift) applied to a matter system. The state of the matter system is not directly measured; instead, we measure an optical mode which interacts with the system. We propose an interferometric setup exploiting a beam-splitter-type of light-matter interaction with homodyne detectors and two methods of estimation. We demonstrate the superiority of the interferometric setup over alternative non-interferometric schemes. Importantly, we show that even limited coupling strength and a noisy matter system are sufficient for very good estimation. Our work opens the way to many future investigations of light-matter interferometry for experimental platforms in quantum metrology of matter systems.
description: 13 pages, 5 figures
Discovery of Log-Periodic Oscillations in Ultra-Quantum Topological Materials
Creators: name: Wang, Huichao
name: Liu, Haiwen
name: Li, Yanan
name: Liu, Yongjie
name: Wang, Junfeng
name: Liu, Jun
name: Dai, Jiyan
name: Wang, Yong
name: Li, Liang
name: Yan, Jiaqiang
name: Mandrus, David
name: Xie, X. C.
name: Wang, Jian
Publisher: name: arXiv
Year: 2017
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Quantum oscillations are usually the manifestation of the underlying physical nature in condensed matter systems. Here we report a new type of log-periodic quantum oscillations in ultra-quantum three-dimensional topological materials. Beyond the quantum limit (QL), the log-periodic oscillations involving up to five oscillating cycles (5 peaks and 5 dips) are observed on the magnetoresistance (MR) of high quality single-crystal ZrTe5, virtually showing the clearest feature of discrete scale invariance (DSI). Further theoretical analyses show that the two-body quasi-bound states can be responsible for the DSI feature. Our work provides a new perspective on the ground state of topological materials beyond the QL.
Bulk and surface electronic properties of SmB6: a hard x-ray photoelectron spectroscopy study
Creators: name: Utsumi, Y.
name: Kasinathan, D.
name: Ko, K-T.
name: Agrestini, S.
name: Haverkort, M. W.
name: Wirth, S.
name: Wu, Y-H.
name: Tsuei, K-D.
name: Kim, D-J.
name: Fisk, Z.
name: Tanaka, A.
name: Thalmeier, P.
name: Tjeng, L. H.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We have carried out bulk-sensitive hard x-ray photoelectron spectroscopy (HAXPES) measurements on in-situ cleaved and ex-situ polished SmB6 single crystals. Using the multiplet-structure in the Sm 3d core level spectra, we determined reliably that the valence of Sm in bulk SmB6 is close to 2.55 at ~5 K. Temperature dependent measurements revealed that the Sm valence gradually increases to 2.64 at 300 K. From a detailed line shape analysis we can clearly observe that not only the J=0 but also the J=1 state of the Sm 4f 6 configuration becomes occupied at elevated temperatures. Making use of the polarization dependence, we were able to identify and extract the Sm 4f spectral weight of the bulk material. Finally, we revealed that the oxidized or chemically damaged surface region of the ex-situ polished SmB6 single crystal is surprisingly thin, about 1 nm only.
description: 11 pages, 8 figures
Lattice Simulations of 10d Yang-Mills toroidally compactified to 1d, 2d and 4d
Creators: name: Hanada, Masanori
name: Romatschke, Paul
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: Toroidally compactified Yang-Mills theory on the lattice is studied by using the Hybrid Monte Carlo algorithm. When the compact dimensions are small, the theory naturally reduces to Yang-Mills with scalars. We confirm previous analytical and numerical results for pure gauge theory with scalars in (0+1) dimensions and at high temperatures to Super-Yang-Mills in (1+1) dimensions. In (1+1) dimensions, our simulations confirm the previously conjectured phase diagram. Furthermore, we find evidence for the sequential breaking of the center symmetry in (1+1) dimensions as a function of the volume. In (3+1) dimensions we present first simulation results for the eigenvalue distribution of the Polyakov and Wilson loops, finding localized, non-uniform and center-symmetric configurations as a function of the lattice coupling.
description: 30 pages, 13 figures; v2: minor changes; v3: minor changes
Long Lived Light Scalars as Probe of Low Scale Seesaw Models
Creators: name: Dev, P. S. Bhupal
name: Mohapatra, Rabindra N.
name: Zhang, Yongchao
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We point out that in generic TeV scale seesaw models for neutrino masses with local $B-L$ symmetry breaking, there is a phenomenologically allowed range of parameters where the Higgs field responsible for $B-L$ symmetry breaking leaves a physical real scalar field with mass around GeV scale. This particle (denoted here by $H_3$) is weakly mixed with the Standard Model Higgs field ($h$) with mixing $θ_1\lesssim m_{H_3}/m_h$, barring fine-tuned cancellation. In the specific case when the $B-L$ symmetry is embedded into the TeV scale left-right seesaw scenario, we show that the bounds on the $h-H_3$ mixing $θ_1$ become further strengthened due to low energy flavor constraints, thus forcing the light $H_3$ to be long lived, with displaced vertex signals at the LHC. The property of left-right TeV scale seesaw models are such that they make the $H_3$ decay to two photons as the dominant mode. This is in contrast with a generic light scalar that mixes with the SM Higgs boson, which could also have leptonic and hadronic decay modes with comparable or larger strength. We discuss the production of this new scalar field at the LHC and show that it leads to testable displaced vertex signals of collimated photon jets, which is a new distinguishing feature of the left-right seesaw model. We also study a simpler version of the model where the $SU(2)_R$ breaking scale is much higher than the ${\cal O}$(TeV) $U(1)_{B-L}$ breaking scale, in which case the production and decay of $H_3$ proceed differently, but its long lifetime feature is still preserved for a large range of parameters. Thus, the search for such long-lived light scalar particles provides a new way to probe TeV scale seesaw models for neutrino masses at colliders.
description: 49 pages, 23 figures, 2 tables, minor changes, version to appear in NPB
From the field to the laboratory, investigating the effects of Deformed wing virus on honey bee health
Creators: name: Woodford, Luke
Publisher: name: University of St Andrews
Year: 2022
Subjects: subject: Deformed wing virus
subject: Varroa
subject: Virus diversity
subject: Recombination
subject: Honey bees
subject: Coordinated treatments
subject: SF538.5V37W7
subject: Varroa destructor
subject: Honey bee--Parasites

description: Varroa destructor is an ectoparasitic mite associated with significant losses of honey bee colonies globally. The mite vectors a range of pathogenic viruses, most notably Deformed wing virus (DWV). DWV is transmitted orally between generations of bees and by this route rarely causes symptomatic infection, but the introduction of Varroa alters the transmission route of the virus and leads to highly elevated virus titres. Annual overwintering colony losses of ~25% are associated with high levels of Varroa-DWV infestation. Effective miticide treatments are available to control Varroa. However, the absence of coordinated treatment means environmental transmission of mites continues unchecked. One of the aims of this study was to determine whether rational, coordinated treatment is beneficial to colony health. Over a period of three years, all colonies managed on the island of Arran were treated in unison. Changes in the mite levels and DWV levels and diversity were measured as indicators of changing colony health. Across the three years of analysis, total mite numbers decreased by 58% and the number of managed colonies increased by 50%. In parallel to the Arran study, a colony management technique – a shook swarm – combined with appropriate miticide treatments was shown to be highly effective in reducing mite infestations and DWV titres. The impact of no mite management was investigated by placing healthy colonies in a high-mite apiary and measuring their rates of mite uptake. This study indicated that mites rapidly enter the colonies, altering the DWV dynamic and typically resulting in colony death. A mite-virus-bee in-silico model, simulating the dynamic changes in the virus population across multiple generations of pupae was designed and recombination between two DWV variants was investigated to examine recombination junctions. These studies shed light on how Varroa-control and colony management techniques impact DWV levels and diversity and honey bee colony health.
S3E Open Call #2 - START Open Call Documents
Creators: name: S3E Consortium
Publisher: name: Zenodo
Year: 2023
Subjects: south3e, innovation, startups, entrepreneurship, deeptech, horizoneurope

description: The S3E START Open Call documents include the Guidelines for Applicants and the Open Call Text and are mandatory to read and follow in order to apply for the S3E START Open Call #2 for Researchers or Tech Transfer Offices. Any doubt, please contact the S3E Consortium through this Helpdesk.
Scale Invariance in Heavy Hadron Molecules
Creators: name: Geng, Lisheng
name: Lu, Junxu
name: Valderrama, Manuel Pavon
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We discuss a scenario in which the $P_c(4450)^{+}$ heavy pentaquark is a $Σ_c \bar{D}^*$-$Λ_{c}(2595) \bar{D}$ molecule. The $Λ_{c1} \bar{D} \to Σ_c \bar{D}^*$ transition is mediated by the exchange of a pion almost on the mass shell that generates a long-range $1/r^2$ potential. This is analogous to the effective force that is responsible for the Efimov spectrum in three-boson systems interacting through short-range forces. The equations describing this molecule exhibit approximate scale invariance, which is anomalous and broken by the solutions. If the $1/r^2$ potential is strong enough this symmetry survives in the form of discrete scale invariance, opening the prospect of an Efimov-like geometrical spectrum in two-hadron systems. For a molecular pentaquark with quantum numbers $\frac{3}{2}^{-}$ the attraction is not enough to exhibit discrete scale invariance, but this prospect might very well be realized in a $\frac{1}{2}^{+}$ pentaquark or in other hadron molecules involving transitions between particle channels with opposite intrinsic parity and a pion near the mass shell. A very good candidate is the $Λ_{c}(2595) \barΞ_b - Σ_c \barΞ_b'$ molecule. Independently of this, the $1/r^2$ force is expected to play a very important role in the formation of this type of hadron molecule, which points to the existence of $\frac{1}{2}^{+}$ $Σ_c D^*$-$Λ_{c}(2595) D$ and $1^+$ $Λ_{c}(2595) Ξ_b - Σ_c Ξ_b'$ molecules and $0^{+}$/$1^{-}$ $Λ_{c}(2595) \barΞ_b - Σ_c \barΞ_b'$ baryonia.
description: 6 pages, 1 figure, corresponds to published version
Jahrbuch / Fachbereich 03, Justus-Liebig-Universität Gießen ; 2015
Creators: name: (:Unkn) Unknown
name: Justus Liebig University Giessen
Publisher: name: Universitätsbibliothek Gießen
Year: 2015
Subjects: subject: ddc:300

description: Das Leitthema des diesjährigen Jahrbuchs lautet " Transformation von Kulturen". Damit reflektiert das Jahrbuch die kulturwissenschaftliche Schwerpunktsetzung am Fachbereich 03.Neben den Kurzvorstellungen der Institute, die für das vorliegende Jahrbuch aktualisiert wurden und Informationen über die Aktivitäten des vergangenen Jahres bieten, wird das Schwerpunktthema des Jahrbuches 2015 vom Institut für Soziologie präsentiert, welches im Zuge des Ausbaus der kulturwissenschaftlichen Säule der JLU ein neues, kultursoziologisches Profil angenommen hat. Die hier durchgeführten Forschungen repräsentieren einen auf Sinngebungsprozesse fokussierten, empirischen und konzeptuell abgesicherten Forschungsansatz, der gesellschaftliche Problematiken in ihrer ganzen Breite behandelt. Dies spiegelt sich in sechs Beiträgen zu folgenden Themenfeldern wider:- grundsätzliche Dynamiken in der Gegenwartsgesellschaft zwischen Stabilitätsversprechen und Wandlungsimperativen- Steuerung von Bildungsprozessen- Wirtschaft und Wirtschaftskrisen- digitale Kommunikation in der Migrationsgesellschaft- kritische Perspektiven auf die europäische Moderne- Gewalt und Krankheit als Grenzfiguren des Sozialen
Statistical Power in Longitudinal Network Studies
Creators: name: Stadtfeld, Christoph
name: Snijders, Tom A. B.
name: Steglich, Christian
name: van Duijn, Marijtje A. J.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: Longitudinal social network studies can easily suffer from insufficient statistical power. Studies that simultaneously investigate change of network ties and change of nodal attributes (selection and influence studies) are particularly at risk because the number of nodal observations is typically much lower than the number of observed tie variables. This paper presents a simulation-based procedure to evaluate statistical power of longitudinal social network studies in which stochastic actor-oriented models (SAOMs) are to be applied. Two detailed case studies illustrate how statistical power is strongly affected by network size, number of data collection waves, effect sizes, missing data, and participant turnover. These issues should thus be explored in the design phase of longitudinal social network studies.
Multi-scale Lipschitz percolation of increasing events for Poisson random walks
Creators: name: Gracar, Peter
name: Stauffer, Alexandre
Publisher: name: arXiv
Year: 2017
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics

description: Consider the graph induced by $\mathbb{Z}^d$, equipped with uniformly elliptic random conductances. At time $0$, place a Poisson point process of particles on $\mathbb{Z}^d$ and let them perform independent simple random walks. Tessellate the graph into cubes indexed by $i\in\mathbb{Z}^d$ and tessellate time into intervals indexed by $τ$. Given a local event $E(i,τ)$ that depends only on the particles inside the space time region given by the cube $i$ and the time interval $τ$, we prove the existence of a Lipschitz connected surface of cells $(i,τ)$ that separates the origin from infinity on which $E(i,τ)$ holds. This gives a directly applicable and robust framework for proving results in this setting that need a multi-scale argument. For example, this allows us to prove that an infection spreads with positive speed among the particles.
description: Additional explanations and figures. arXiv admin note: text overlap with arXiv:1108.6322