cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Strong-coupling expansion for the spin-1 Bose-Hubbard model
Creators: name: Kimura, Takashi
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: In this study, we perform a strong-coupling expansion up to third order of the hopping parameter $t$ for the spin-1 Bose--Hubbard model with antiferromagnetic interaction. As expected from previous studies, the Mott insulator phase is considerably more stable against the superfluid phase when filling with an even number of bosons than when filling with an odd number of bosons. The phase-boundary curves are consistent with the perturbative mean-field theory in the limit of infinite dimensions. The critical value of the hopping parameter $t_{\rm C}$ at the peak of the Mott lobe depends on the antiferromagnetic interaction. This result indicates the reliability of the strong coupling expansion when $U_2$ possesses large (intermediate) values for Mott lobe with an even (odd) number of bosons. Moreover, in order to improve our results, we apply a few extrapolation methods up to infinite order in $t$. The fitting results of the phase-boundary curves agree better with those of the perturbative mean-field approximation. In addition, the linear fit error of $t_{\rm C}$ is very small for the strong antiferromagnetic interaction.
description: 22 pages, 11 figures
The Benefits of Stress: Resolution of the Lifshitz Singularity
Creators: name: Bao, Ning
name: Dong, Xi
name: Harrison, Sarah
name: Silverstein, Eva
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Through the AdS/CFT correspondence, Lifshitz spacetimes describe field theories with dynamical scaling ($z \neq 1$). Although curvature invariants are small, the Lifshitz metric exhibits a null singularity in the IR with a large tidal force that excites string oscillator modes. However, Lifshitz is not a vacuum solution of the Einstein equations -- the metric is supported by nontrivial matter content which must be taken into account in analyzing the propagation of test objects. In this paper, we consider the interaction of a string with a D0-brane density in the IR which supports a class of UV-complete $z=2$ Lifshitz constructions. We show that string/D-brane scattering in the Regge limit slows the string significantly, preventing divergent mode production and resolving the would-be singularity in string propagation.
description: 16 pages; v2: new references added
Three Aotearoa New Zealand Meloidogyne nematodes predict biosecurity risk from overseas species *
Creators: name: Aalders, Lee
name: Bell, Nigel
Publisher: name: AgResearch
Year: 2024
Subjects: classificationCode: 410202
subject: Biosecurity science and invasive species ecology

description: Meloidogyne minor was discovered in AoNZ at a sports ground in 2015. Since then, control measures (nematicide and footwear washing) appear to have limited the spread of this nematode to that single location. Being such a recent incursion does highlight the need for ongoing biosecurity surveillance especially on those pathways that could allow Meloidogyne to enter and establish in AoNZ.By contrast, both M. trifoliophila and M. fallax have been present in AoNZ for several decades. M. trifoliophila has a limited host range (mostly clovers) and appears to have a distribution limited by temperature to the North Island and the west coast of the South Island. Conversely M. fallax has a wide host range and has spread throughout the country. M. fallax spread through the South Island over a relatively short span of time (1-2 decades). The combination of wide host range and rapid spread characteristics suggests M. fallax biology is worthy of closer study to understand what aspects are responsible for those characteristics. Such understanding would allow for matching to similar Meloidogyne not currently in AoNZ and identification of those species that are high risk for this country’s primary production industries.Together M. minor, M. trifoliophila and M. fallax present an opportunity to identify high risk Meloidogyne to AoNZ and take appropriate steps to minimise the risk of their entry.* Conference abstract title: Three contrasting species of Meloidogyne nematodes in Aotearoa New Zealand (AoNZ) illustrate the potential to identify biosecurity risk from invasive Meloidogyne species
title: Medizinische Begutachtung  digitaler Gesundheitsanwendungen  im Projekt „Trusted Health Apps“.  Bewertungsprojekt: Angst- und Panikstörungen. Anwendung: HelloBetter Panik
Creators: name: Thiele, Christian
Publisher: name: Bertelsmann Stiftung
publisherIdentifier: https://ror.org/01wj9hk44
publisherIdentifierScheme: ROR
Year: 2025
Subjects: Digitale Gesundheitsanwendung
Panikstörung
Angststörung

description: Unsere medizinische Bewertung digitaler Gesundheitsanwendungen (DiGA) zeigt, dass die medizinische Qualität und Unterschiede in ihrer Evidenzlage systematisch und transparent dargestellt werden können. Dies ist ein entscheidender Schritt, um Patientinnen und Patienten sowie der Ärzteschaft und anderen Stakeholdern Orientierung zu bieten.

In diesem Bericht werden die Ergebnisse zur Anwendung "HelloBetter Panik" dargestellt.
P stabilizes dark matter and with CP can predict leptonic phases
Creators: name: Kuchimanchi, Ravi
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We find that spontaneously broken parity (P) or left-right symmetry stabilizes dark matter in a beautiful way. If dark matter has a non-real intrinsic parity \pm i (e.g. Majorana fermions), parity can ensure that it cannot decay to all normal particles with real intrinsic parities. However if Majorana couplings are absent either in the Lepton or the dark sector, P symmetry can be redefined to remove relative non-real intrinsic phases. It is therefore predicted that neutrinos and dark matter fermions must have Majorana masses if dark matter is stable due to parity. We also consider vectorlike doublet fermions with intrinsic parity \pm i. Strong CP problem is solved by additionally imposing CP. Leptonic CP phases vanish at the tree level in the minimal strong CP solving model, which is a testable prediction. Experimentally if leptonic CP phases are not found (they are found to be consistent with 0 or π) it can be evidence for the type of models in this work where CP is spontaneously or softly broken and there is also a second hidden or softly broken symmetry such as P, Z_2 or Z_4. However leptonic CP violation can be present in closely related or some non-minimal versions of these models.
description: Updated version with better formatting. Results unchanged
Primordial Bispectrum and Trispectrum Contributions to the Non-Gaussian Excursion Set Halo Mass Function with Diffusive Drifting Barrier
Creators: name: Achitouv, Ixandra E.
name: Corasaniti, Pier Stefano
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The high-mass end of the halo mass function is a sensitive probe of primordial non-Gaussianity (NG). In a recent study [9] we have computed the NG halo mass function in the context of the Excursion Set theory and shown that the primordial NG imprint is coupled to that induced by the non-linear collapse of dark matter halos. We also found an excellent agreement with N-body simulation results. Here, we perform a more accurate computation which accounts for the interval validity of the bispectrum expansion to next-to-leading order and extend the calculation to the case of a non-vanishing primordial trispectrum.
description: 9 pages 3 figures
Der Antriebsstrang von Radladern mit hydrostatischem Fahrantrieb
Creators: name: Pfab, Herbert
Publisher: name: LANDTECHNIK
Year: 2003

description: Durch den Einsatz elektronischer Steuerungen hat der hydrostatische Fahrantrieb in den letzten Jahren große Fortschritte in Bezug auf Funktion, Konmfort und Wirtschaftlichkeit erzielt. In Kombination mit spezialisierten Schaltgetrieben entsteht ein stufenloser Antrieb, der in der Anwendung bei Radladern die Anforderungen sehr gut erfüllt. Der Beitrag behandelt Anforderungen, Auslegung, Konzeption und Betriebsverhalten moderner hydrostatischer Fahrantriebe in Radladern
description: LANDTECHNIK, Bd. 58 Nr. 3 (2003)
Why is the Milky Way X-factor Constant?
Creators: name: Narayanan, Desika
name: Hopkins, Philip
Publisher: name: arXiv
Year: 2012
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The CO-H2 conversion factor (Xco; otherwise known as the X-factor) is observed to be remarkably constant in the Milky Way and in the Local Group (aside from the SMC). To date, our understanding of why Xco should be so constant remains poor. Using a combination of extremely high resolution (~ 1 pc) galaxy evolution simulations and molecular line radiative transfer calculations, we suggest that Xco displays a narrow range of values in the Galaxy due to the fact that molecular clouds share very similar physical properties. In our models, this is itself a consequence of stellar feedback competing against gravitational collapse. GMCs whose lifetimes are regulated by radiative feedback show a narrow range of surface densities, temperatures and velocity dispersions with values comparable to those seen in the Milky Way. As a result, the X-factors from these clouds show reasonable correspondence with observed data from the Local Group, and a relatively narrow range. On the other hand, feedback-free clouds collapse to surface densities that are larger than those seen in the Galaxy, and hence result in X-factors that are systematically too large compared to the Milky Way's. We conclude that radiative feedback within GMCs can generate cloud properties similar to those observed in the Galaxy, and hence a roughly constant Milky Way X-factor in normal, quiescent clouds.
description: MNRAS Accepted
The Cosmic Evolution of the IMF Under the Jeans Conjecture with Implications for Bottom-Heavy Ellipticals
Creators: name: Narayanan, Desika
name: Davé, Romeel
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We examine the cosmic evolution of a stellar initial mass function (IMF) in galaxies that varies with the Jeans mass in the interstellar medium, paying particular attention to the K-band stellar mass to light ratio (M/L_K) of present-epoch massive galaxies. We calculate the typical Jeans mass using high-resolution hydrodynamic simulations coupled with a fully radiative model for the ISM, which yields a parameterisation of the IMF characteristic mass as a function of galaxy star formation rate (SFR). We then calculate the star formation histories of galaxies utilising an equilibrium galaxy growth model coupled with constraints on the star formation histories set by abundance matching models. We find that at early times, energetic coupling between dust and gas drive warm conditions in the ISM, yielding bottom-light/top- heavy IMFs associated with large ISM Jeans masses for massive star-forming galaxies. Owing to the remnants of massive stars that formed during the top-heavy phases at early times, the resultant M/L_K(sigma) in massive galaxies at the present epoch is increased relative to the non- varying IMF case. At late times, lower cosmic ray fluxes allow for cooler ISM temperatures in massive galaxies, and hence newly formed clusters will exhibit bottom-heavy IMFs, further increasing M/L_K(sigma). Our central result is hence that a given massive galaxy may go through both top-heavy and bottom-heavy IMF phases during its lifetime, though the bulk of the stars form during a top-heavy phase. Qualitatively, the variations in M/L_K(sigma) with galaxy mass are in agreement with observations, however, our model may not be able to account for bottom-heavy mass functions as indicated by stellar absorption features.
description: Accepted by MNRAS
Coherent Quantum Transport in Photonic Lattices
Creators: name: Perez-Leija, Armando
name: Keil, Robert
name: Kay, Alastair
name: Moya-Cessa, Hector
name: Nolte, Stefan
name: Kwek, Leong-Chuan
name: Rodríguez-Lara, Blas M.
name: Szameit, Alexander
name: Christodoulides, Demetrios N.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Transferring quantum states efficiently between distant nodes of an information processing circuit is of paramount importance for scalable quantum computing. We report on the first observation of a perfect state transfer protocol on a lattice, thereby demonstrating the general concept of trans- porting arbitrary quantum information with high fidelity. Coherent transfer over 19 sites is realized by utilizing judiciously designed optical structures consisting of evanescently coupled waveguide ele- ments. We provide unequivocal evidence that such an approach is applicable in the quantum regime, for both bosons and fermions, as well as in the classical limit. Our results illustrate the potential of the perfect state transfer protocol as a promising route towards integrated quantum computing on a chip.
Algorithmic detectability of iwip automorphisms
Creators: name: Kapovich, Ilya
Publisher: name: arXiv
Year: 2012
Subjects: subject: Group Theory (math.GR)
subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 20F65

description: We produce an algorithm that, given $ϕ\in Out(F_N)$, where $N\ge 2$, decides wether or not $ϕ$ is an iwip ("fully irreducible") automorphism.
description: final version, to appear in the Bulletin of London Math. Soc
A direct probe of cosmological power spectra of the peculiar velocity field and the gravitational lensing magnification from photometric redshift surveys
Creators: name: Nusser, Adi
name: Branchini, Enzo
name: Feix, Martin
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The cosmological peculiar velocity field (deviations from the pure Hubble flow) of matter carries significant information on dark energy, dark matter and the underlying theory of gravity on large scales. Peculiar motions of galaxies introduce systematic deviations between the observed galaxy redshifts z and the corresponding cosmological redshifts z_cos. A novel method for estimating the angular power spectrum of the peculiar velocity field based on observations of galaxy redshifts and apparent magnitudes m (or equivalently fluxes) is presented. This method exploits the fact that a mean relation between z_cos and m of galaxies can be derived from all galaxies in a redshift-magnitude survey. Given a galaxy magnitude, it is shown that the z_cos(m) relation yields its cosmological redshift with a 1-sigma error of sigma_z~0.3 for a survey like Euclid (~10^9 galaxies at z
description: 22 pages, 3 figures; added a discussion of systematic errors, accepted for publication in JCAP
Modified wave equation for spinless particles and its solutions in an external magnetic field
Creators: name: Kruglov, S. I.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The wave equation for spinless particles with the Lorentz violating term is considered. We formulate the third-order in derivatives wave equation leading to the modified dispersion relation. The first-order formalism is considered and the density matrix is obtained. The Schrödinger form of equations is presented and the quantum-mechanical Hamiltonian is found. Exact solutions of the wave equation are obtained for particles in the constant and uniform external magnetic field. The change of the synchrotron radiation radius due to quantum gravity corrections is calculated.
description: 15 pages, no figures, extended journal version, accepted in MPLA
An Alternative Numerical Method for the Stationary Pulsar Magnetosphere
Creators: name: Takamori, Yohsuke
name: Okawa, Hirotada
name: Takamoto, Makoto
name: Suwa, Yudai
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Stationary pulsar magnetospheres in the force-free system are governed by the pulsar equation. In 1999, Contopoulos, Kazanas, and Fendt (hereafter CKF) numerically solved the pulsar equation and obtained a pulsar magnetosphere model called the CKF solution that has both closed and open magnetic field lines. The CKF solution is a successful solution, but it contains a poloidal current sheet that flows along the last open field line. This current sheet is artificially added to make the current system closed. In this paper, we suggest an alternative method to solve the pulsar equation and construct pulsar magnetosphere models without a current sheet. In our method, the pulsar equation is decomposed into Ampere's law and the force-free condition. We numerically solve these equations simultaneously with a fixed poloidal current. As a result, we obtain a pulsar magnetosphere model without a current sheet, which is similar to the CKF solution near the neutron star and has a jet-like structure at a distance along the pole. In addition, we discuss physical properties of the model and find that the force-free condition breaks down in a vicinity of the light cylinder due to dissipation that is included implicitly in the numerical method.
description: 15 pages, 10 figures, 1 table, change title, improve contents, accepted for publication in PASJ
Measurement of W^+W^- production in pp collisions at sqrt{s}=7 TeV with the ATLAS detector and limits on anomalous WWZ and WWgamma couplings
Creators: name: ATLAS Collaboration
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: This paper presents a measurement of the W^+W^- production cross section in pp collisions at sqrt{s}=7 TeV. The leptonic decay channels are analyzed using data corresponding to an integrated 4.6 fb-1 collected with the ATLAS detector at the Large Hadron Collider. The W^+W^- production cross section sigma(pp -> W^+W^-+X) is measured to be 51.9 +- 2.0 (stat) +- 3.9 (syst) +- 2.0 (lumi) pb, compatible with the Standard Model prediction of 44.7 +2.1 -1.9 pb. A measurement of the normalized fiducial cross section as a function of the leading lepton transverse momentum is also presented. The reconstructed transverse momentum distribution of the leading lepton is used to extract limits on anomalous WWZ and WWgamma couplings.
description: 16 pages plus author list (29 pages total), 10 figures, 9 tables, submitted to Phys. Rev. D. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2012-01/ This version includes modifications described in the erratum that can be found at http://prd.aps.org/abstract/PRD/v88/i7/e079906
General dissipation coefficient in low-temperature warm inflation
Creators: name: Bastero-Gil, Mar
name: Berera, Arjun
name: Ramos, Rudnei O.
name: Rosa, Joao G.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In generic particle physics models, the inflaton field is coupled to other bosonic and fermionic fields that acquire large masses during inflation and may decay into light degrees of freedom. This leads to dissipative effects that modify the inflationary dynamics and may generate a nearly-thermal radiation bath, such that inflation occurs in a warm rather than supercooled environment. In this work, we perform a numerical computation and obtain expressions for the associated dissipation coefficient in supersymmetric models, focusing on the regime where the radiation temperature is below the heavy mass threshold. The dissipation coefficient receives contributions from the decay of both on-shell and off-shell degrees of freedom, which are dominant for small and large couplings, respectively, taking into account the light field multiplicities. In particular, we find that the contribution from on-shell decays, although Boltzmann-suppressed, can be much larger than that of virtual modes, which is bounded by the validity of a perturbative analysis. This result opens up new possibilities for realizations of warm inflation in supersymmetric field theories.
description: 25 pages, 13 figures; revised version with new results added; published in JCAP
Equidistribution estimates for Fekete points on complex manifolds
Creators: name: Lev, Nir
name: Ortega-Cerdà, Joaquim
Publisher: name: arXiv
Year: 2012
Subjects: subject: Complex Variables (math.CV)
subject: FOS: Mathematics

description: We study the equidistribution of Fekete points in a compact complex manifold. These are extremal point configurations defined through sections of powers of a positive line bundle. Their equidistribution is a known result. The novelty of our approach is that we relate them to the problem of sampling and interpolation on line bundles, which allows us to estimate the equidistribution of the Fekete points quantitatively. In particular we estimate the Kantorovich-Wasserstein distance of the Fekete points to its limiting measure. The sampling and interpolation arrays on line bundles are a subject of independent interest, and we provide necessary density conditions through the classical approach of Landau, that in this context measures the local dimension of the space of sections of the line bundle. We obtain a complete geometric characterization of sampling and interpolation arrays in the case of compact manifolds of dimension one, and we prove that there are no arrays of both sampling and interpolation in the more general setting of semipositive line bundles.
description: Improved version with a sharp decay rate in the estimate of the Kantorovich-Wasserstein distance of the Fekete points to its limiting measure (Theorem 2)
Maximum principle for the finite element solution of time dependent anisotropic diffusion problems
Creators: name: Li, Xianping
name: Huang, Weizhang
Publisher: name: arXiv
Year: 2012
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: Preservation of the maximum principle is studied for the combination of the linear finite element method in space and the $θ$-method in time for solving time dependent anisotropic diffusion problems. It is shown that the numerical solution satisfies a discrete maximum principle when all element angles of the mesh measured in the metric specified by the inverse of the diffusion matrix are non-obtuse and the time step size is bounded below and above by bounds proportional essentially to the square of the maximal element diameter. The lower bound requirement can be removed when a lumped mass matrix is used. In two dimensions, the mesh and time step conditions can be replaced by weaker Delaunay-type conditions. Numerical results are presented to verify the theoretical findings.
description: 25 pages, 7 figures, 4 tables
Scaling in the correlation energies of two-dimensional artificial atoms
Creators: name: Odriazola, Alexander
name: Ervasti, Mikko M
name: Makkonen, Ilja
name: Delgado, Alain
name: González, Augusto
name: Räsänen, Esa
name: Harju, Ari
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We find an unexpected scaling in the correlation energy of artificial atoms, i.e., harmonically confined two-dimensional quantum dots. The scaling relation is found through extensive numerical examinations including Hartree-Fock, variational quantum Monte Carlo, density-functional, and full configuration-interaction calculations. We show that the correlation energy, i.e., the true ground-state total energy subtracted by the Hartree-Fock total energy, follows a simple function of the Coulomb energy, confimenent strength and, the number of electrons. We find an analytic expression for this function, as well as for the correlation energy per particle and for the ratio between the correlation and total energies. Our tests for independent diffusion Monte Carlo and coupled-cluster results for quantum dots -- including open-shell data -- confirm the generality of the obtained scaling. As the scaling is also well applicable to $\gtrsim$ 100 electrons, our results give interesting prospects for the development of correlation functionals within density-functional theory.
description: Accepted to Journal of Physics: Condensed Matter
Share of open access journal articles published by Berlin authors: data from 2020 and recap for the years 2016–2020
Creators: name: Hampl, Martin
name: Finke, Pamela
name: Voigt, Michaela
Publisher: name: Technische Universität Berlin
Year: 2022
Subjects: subject: 020 Bibliotheks- und Informationswissenschaften
subject: Publikationsanalyse
subject: Kennzahlen
subject: Zeitschriftenartikel
subject: open access monitoring
subject: Berlin
subject: gold open access
subject: green open access
subject: hybrid open access
subject: journal articles

description: The publication output from nine research institutions from Berlin (Germany) was analysed and the share of open access for journal articles published in 2020 was determined. Journal articles whose authors are affiliated with at least one of the nine institutions were analysed. The data description includes: description of provided files and respective sheets, list of data fields and their sources, data re-use cases. The data described here were retrieved from multiple bibliographic databases. Due to license terms raw data from individual databases cannot be provided for download. Data was aggregated, normalised and analysed with a Python script which is available at https://github.com/tuub/oa-eval (code documentation in English, accompanying manual in German). For a detailed description of the retrieval process and the analysis steps see the manual and the final report. Additionally, article data from the previous years (2016–2020) were aggregated, and the open access status was re-assessed. Data are included in separate files which are described in detail in the data description.
Emergence of a non trivial fluctuating phase in the XY model on regular networks
Creators: name: De Nigris, Sarah
name: Leoncini, Xavier
Publisher: name: arXiv
Year: 2012
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study an XY-rotor model on regular one dimensional lattices by varying the number of neighbours. The parameter $2\geγ\ge1$ is defined. $γ=2$ corresponds to mean field and $γ=1$ to nearest neighbours coupling. We find that for $γ<1.5$ the system does not exhibit a phase transition, while for $γ> 1.5$ the mean field second order transition is recovered. For the critical value $γ=γ_c=1.5$, the systems can be in a non trivial fluctuating phase for whichthe magnetisation shows important fluctuations in a given temperature range, implying an infinite susceptibility. For all values of $γ$ the magnetisation is computed analytically in the low temperatures range and the magnetised versus non-magnetised state which depends on the value of $γ$ is recovered, confirming the critical value $γ_{c}=1.5$.
Hardware-efficient autonomous quantum error correction
Creators: name: Leghtas, Zaki
name: Kirchmair, Gerhard
name: Vlastakis, Brian
name: Schoelkopf, Robert
name: Devoret, Michel
name: Mirrahimi, Mazyar
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose a new method to autonomously correct for errors of a logical qubit induced by energy relaxation. This scheme encodes the logical qubit as a multi-component superposition of coherent states in a harmonic oscillator, more specifically a cavity mode. The sequences of encoding, decoding and correction operations employ the non-linearity provided by a single physical qubit coupled to the cavity. We layout in detail how to implement these operations in a practical system. This proposal directly addresses the task of building a hardware-efficient and technically realizable quantum memory.
description: 12 pages,6 figures
Asymptotically hyperbolic manifolds with small mass
Creators: name: Dahl, Mattias
name: Gicquaud, Romain
name: Sakovich, Anna
Publisher: name: arXiv
Year: 2012
Subjects: subject: Differential Geometry (math.DG)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 53C21, (83C05, 83C30)

description: For asymptotically hyperbolic manifolds of dimension $n$ with scalar curvature at least equal to $-n(n-1)$ the conjectured positive mass theorem states that the mass is non-negative, and vanishes only if the manifold is isometric to hyperbolic space. In this paper we study asymptotically hyperbolic manifolds which are also conformally hyperbolic outside a ball of fixed radius, and for which the positive mass theorem holds. For such manifolds we show that the conformal factor tends to one as the mass tends to zero.
Constraining the Preferred-Frame $α_1$, $α_2$ parameters from Solar System planetary precessions
Creators: name: Iorio, Lorenzo
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: Analytical expressions for the orbital precessions affecting the relative motion of the components of a local binary system induced by Lorentz-violating Preferred Frame Effects (PFE) are explicitly computed in terms of the PPN parameters $α_1$, $α_2$. A linear combination of the supplementary perihelion precessions of all the inner planets of the Solar System, able to remove the a-priori bias of unmodelled/mismodelled standard effects such as the general relativistic Lense-Thirring precessions and the classical rates due to the Sun's oblateness $J_2$, allows to infer $|α_1| \leq 6\times 10^{-6}, |α_2| \leq 3.5\times 10^{-5}$. Such bounds should be improved in the near future after processing the data that are being collected by the MESSENGER spacecraft, currently orbiting Mercury. Further improvements may come in the mid-future from the approved BepiColombo mission to Mercury. The constraint $|α_2|\leq 10^{-7}$ existing in the literature is critically discussed (Abridged).
description: LaTex2e, 39 pages, 2 figures, 2 tables, 97 references. Matching the version at press in International Journal of Modern Physics D (IJMPD)
Deficient adaptation to centrosome duplication defects in neural progenitors causes microcephaly and subcortical heterotopias.
Creators: name: González-Martínez, José
name: Cwetsch, Andrzej W
name: Martínez-Alonso, Diego
name: López-Sainz, Luis R
name: Almagro, Jorge
name: Melati, Anna
name: Gómez, Jesús
name: Pérez-Martínez, Manuel
name: Megías, Diego
name: Boskovic, Jasminka
name: Gilabert-Juan, Javier
name: Castro, Osvaldo Graña
name: Pierani, Alessandra
name: Behrens, Axel
name: Ortega, Sagrario
name: Malumbres, Marcos
Publisher: name: The Francis Crick Institute
Year: 2021
Subjects: Model organisms
Tumour Biology
Gene Expression
Genetics & Genomics
Genome Integrity & Repair
Stem Cells

description: Congenital microcephaly (MCPH) is a neurodevelopmental disease associated to mutations in genes encoding proteins involved in centrosomal and chromosomal dynamics during mitosis. Detailed MCPH pathogenesis at the cellular level is still elusive given the diversity of MCPH genes and lack of comparative in vivo studies. By generating a series of CRISPR/Cas9-mediated genetic knockouts we report here that, whereas defects in spindle pole proteins (ASPM, MCPH5) result in mild microcephaly during development, lack of centrosome (CDK5RAP2, MCPH3) or centriole (CEP135, MCPH8) regulators induces delayed chromosome segregation and chromosomal instability in neural progenitors (NPs). Our novel mouse model of MCPH8 suggests that Cep135 deficiency results in centriole duplication, TP53 activation and cell death of NPs. Trp53 ablation in a Cep135-deficient background prevents cell death, but not microcephaly, and leads to subcortical heterotopias, a malformation seen in MCPH8 patients. These results suggest that microcephaly in some MCPH patients can arise from the lack of adaptation to centriole defects in NPs and may lead to architectural defects if chromosomally unstable cells are not eliminated during brain development.
Loop corrections and a new test of inflation
Creators: name: Tasinato, Gianmassimo
name: Byrnes, Christian T.
name: Nurmi, Sami
name: Wands, David
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Inflation is the leading paradigm for explaining the origin of primordial density perturbations and the observed temperature fluctuations of the cosmic microwave background. However many open questions remain, in particular whether one or more scalar fields were present during inflation and how they contributed to the primordial density perturbation. We propose a new observational test of whether multiple fields, or only one (not necessarily the inflaton) generated the perturbations. We show that our test, relating the bispectrum and trispectrum, is protected against loop corrections at all orders, unlike previous relations.
description: 6 pages; v2: references added, minor changes; v3: Extended discussion, including the role of gravitational corrections. References added. Version accepted for publication in PRD
Analytical solutions of the Schrödinger equation with the Manning-Rosen potential plus a Ring-Shaped like potential
Creators: name: Ahmadov, H. I.
name: Aydin, C.
name: Huseynova, N. Sh.
name: Uzun, O.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: The analytical solution of the Schrödinger equation for the Manning-Rosen potential plus a ring-shaped like potential is obtained by applying the Nikiforov-Uvarov method by using the improved approximation scheme to the centrifugal potential for arbitrary $l$ states. The energy levels are worked out and the corresponding normalized eigenfunctions are obtained in terms of orthogonal polynomials for arbitrary $l$ states.
description: 19 pages, 5 figures, 2 tables
A Brownian Model for Crystal Nucleation
Creators: name: Durán-Olivencia, Miguel A.
name: Otálora, Fermín
Publisher: name: arXiv
Year: 2012
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: In this work a phenomenological stochastic differential equation is proposed to model the time evolution of the radius of a pre-critical molecular cluster during nucleation (the classical order parameter). Such a stochastic differential equation constitutes the basis for the calculation of the (nucleation) induction time under Kramers' theory of thermally activated escape processes. Considering the nucleation stage as a Poisson rare-event, analytical expressions for the induction time statistics are deduced for both steady and unsteady conditions, the latter assuming the semiadiabatic limit. These expressions can be used to identify the underlying mechanism of molecular cluster formation (distinguishing between homogeneous or heterogeneous nucleation from the nucleation statistics is possible) as well as to predict induction times and induction time distributions. The predictions of this model are in good agreement with experimentally measured induction times at constant temperature, unlike the values obtained from the classical equation, but agreement is not so good for induction time statistics. Stochastic simulations truncated to the maximum waiting time of the experiments confirm that this fact is due to the time constraints imposed by experiments. Correcting for this effect, the experimental and predicted curves fit remarkably well. Thus, the proposed model seems to be a versatile tool to predict cluster size distributions, nucleation rates, (nucleation) induction time and induction time statistics for a wide range of conditions (e.g. time-dependent temperature, supersaturation, pH, etc.) where classical nucleation theory is of limited applicability.
description: 20 pages, 3 figures
Arnold Diffusion in a Restricted Planar Four-Body Problem
Creators: name: Xue, Jinxin
Publisher: name: arXiv
Year: 2012
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics

description: This paper constructs a certain planar four-body problem which exhibits fast energy growth. The system considered is a quasi-periodic perturbation of the Restricted Planar Circular three-body Problem (RPC3BP). Gelfreich-Turaev's and de la Llave's mechanism is employed to obtain the fast energy growth. The diffusion is created by a heteroclinic cycle formed by two Lyapunov periodic orbits surrounding $L_1$ and $L_2$ Lagrangian points and their heteroclinic intersections. Our model is the first known example in celestial mechanics of the a priori chaotic case of Arnold diffusion.
Rashba spin-orbit interaction in graphene armchair nanoribbons
Creators: name: Lenz, Lucia
name: Urban, Daniel F.
name: Bercioux, Dario
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study graphene nanoribbons (GNRs) with armchair edges in the presence of Rashba spin-orbit interaction (RSOI). We impose the boundary conditions on the tight binding Hamiltonians for bulk graphene with RSOI by means of a sine transform and study in detail the influence of RSOI on the spectra and the spin polarization. We show that the spin polarization perpendicular to the GNR changes sign when reversing the momentum along the GNR if the bands are coupled by strong RSOI. Furthermore, we derive a linearized approximation to the RSOI Hamiltonian and find that only the neighboring modes of an energy band have to be taken into account in order to achieve a good approximation for the same band. Due to their experimental availability and various proposals for engineering appropriate RSOI, GNRs with armchair edges are a promising candidate for possible spintronics applications.
description: added journal reference, small updates, 9 pages, 8 figures
Measurement of the semileptonic charge asymmetry using Bs^0 -> D_s mu X decays
Creators: name: D0 Collaboration
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We present a measurement of the time-integrated flavor-specific semileptonic charge asymmetry in the decays of Bs mesons that have undergone flavor mixing, a^s_ls, using B_s^0 (barB_s^0) -> D_s^-/+ mu^+/- X decays, with D_s^-/+ -> phi pi^-/+ and phi K^+ K^-, using 10.4 fb^-1 of proton-antiproton collisions collected by the D0 detector during Run II at the Fermilab Tevatron Collider. A fit to the difference between the time-integrated D_s^-$ and D_s^+ mass distributions of the B_s^0 and barB^0_s candidates yields the flavor-specific asymmetry a^s_ls = [-1.12 pm 0.74 (stat) +/-0.17 (syst)]% which is the most precise measurement and in agreement with the standard model prediction.
description: 7 pages, 3 figures (updated with changes made in journal review process)
Gabriele Metzler, Der Staat der Historiker. Staatsvorstellungen deutscher Historiker seit 1945, Berlin (Suhrkamp) 2018
Creators: name: Duhamelle, Christophe
Publisher: name: Francia-Recensio
Year: 2019

description: Gabriele Metzler, Der Staat der Historiker. Staatsvorstellungen deutscher Historiker seit 1945, Berlin (Suhrkamp) 2018, 371 S. (suhrkamp taschenbuch wissenschaft, 2269), ISBN 978-3-518-29869-5, EUR 22,00.
description: Francia-Recensio, 2019/3
Inhalt
Creators: name: Redaktion, Die
Publisher: name: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts
Year: 2019

description: -
description: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts, Bd. 89 2011(2013)
Voituron_procb_ESM_figures.pdf from Temperature-independent telomere lengthening with age in the long-lived human fish (Proteus anguinus)
Creators: name: Voituron, Yann
name: Guillaume, Olivier
name: Dumet, Adeline
name: Zahn, Sandrine
name: Criscuolo, Francois
Publisher: name: The Royal Society
Year: 2023
Subjects: subject: Cell Biology
subject: Ecology
subject: FOS: Biological sciences

description: Despite number of studies showing negative relationship between age and telomere length, the universality of this pattern has been recently challenged mainly in ectothermic animals exhibiting diverse effect of age on telomere shortening. However, data on ectotherms may be strongly affected by thermal history of the individuals. We thus investigated the age-related changes in relative telomere length in the skin of a small but long-lived amphibian living naturally in stable thermal environment over its entire life allowing the comparison with other homeotherms animals like birds and mammals. The present data showed a positive relation between telomere length and individual age, independent of sex and body size. A segmented analysis highlighted a breakpoint in the telomere length–age relationship, suggesting that telomere length reached a plateau at the age of 25 years. Further studies focusing on the biology of animals that live much longer than expected based on body mass will contribute to our better understanding of how ageing processes evolved and may also bring innovation for extend human health span.
On generalized series fields and exponential-logarithmic series fields with derivations
Creators: name: Matusinski, Mickaël
Publisher: name: arXiv
Year: 2012
Subjects: subject: Commutative Algebra (math.AC)
subject: FOS: Mathematics

description: We survey some important properties of fields of generalized series and of exponential-logarithmic series, with particular emphasis on their possible differential structure, based on a joint work of the author with S. Kuhlmann [KM12b,KM11].
description: 23 pages, 1 figure
Serratia spp. bacteria evolved in Aotearoa-New Zealand for infection of endemic scarab beetles
Creators: name: Hurst, Mark
name: O'Callaghan, Maureen
name: Glare, Travis
name: Jackson, Trevor
Publisher: name: AgResearch
Year: 2024
Subjects: classificationCode: 410202
subject: Biosecurity science and invasive species ecology

description: The Melolonthinae branch of the beetle family Scarabaeidae has evolved in isolation in Aotearoa, radiating into >100 endemic species, since Aotearoa separated from Gondwanaland 82 million years ago. The group includes important pasture pests, such as the New Zealand grass grub Costelytra giveni and the manuka beetle Pyronota festiva. These beetles, like other organisms, host their own distinctive microflora including beneficial microbial symbionts and pathogens. A wide range of microbial pathogens infect the Scarabaeidae, but in Aotearoa the bacteria Serratia entomophila, S. proteamaculans and S. quinivorans (Enterobacteriaceae) are frequently found causing natural disease epizootics in C. giveni. S. entomophila is widespread in Aotearoa pasture soils, with only rare isolations of S. entomophila documented in other countries. In contrast S. proteamaculans and S. quinivorans are globally ubiquitous, and are widely distributed within Aotearoa, with some isolates active against either C. giveni or Pyronota spp. larvae, or both. Virulence determinants that impart differential host specificity and potency are located on variants of the amber disease associated plasmid (pADAP). The host specificity of the Serratia-scarab system and the absence of similar systems in other geographies, suggests that the relationship between Serratia spp. and endemic scarabs has evolved in Aotearoa.
Non-relativistic pair annihilation of nearly mass degenerate neutralinos and charginos I. General framework and S-wave annihilation
Creators: name: Beneke, M.
name: Hellmann, C.
name: Ruiz-Femenia, P.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We compute analytically the tree-level annihilation rates of a collection of non-relativistic neutralino and chargino two-particle states in the general MSSM, including the previously unknown off-diagonal rates. The results are prerequisites to the calculation of the Sommerfeld enhancement in the MSSM, which will be presented in subsequent work. They can also be used to obtain concise analytic expressions for MSSM dark matter pair annihilation in the present Universe for a large number of exclusive two-particle final states.
description: LATeX, 24 pages (+ 25 pages Appendix), 11 figures; v2 - replaced incorrect version of Fig. 4 and fixed typos listed in the JHEP erratum
Accurate nuclear masses from a three parameter Kohn-Sham DFT approach (BCPM)
Creators: name: Baldo, M.
name: Robledo, L. M.
name: Schuck, P.
name: Viñas, X.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Given the promising features of the recently proposed Barcelona-Catania-Paris (BCP) functional \cite{Baldo.08}, it is the purpose of this paper to still improve on it. It is, for instance, shown that the number of open parameters can be reduced from 4-5 to 2-3, i.e. by practically a factor of two. One parameter is tightly fixed by a fine-tuning of the bulk, a second by the surface energy. The third is the strength of the spin-orbit potential on which the final result does not depend within the scatter of the values used in Skyrme and Gogny like functionals. An energy rms value of 1.58 MeV is obtained from a fit of these three parameters to the 579 measured masses reported in the Audi and Waspra 2003 compilation. This rms value compares favorably with the one obtained using other successful mean field theories. Charge radii are also well reproduced when compared with experiment. The energies of some excited states, mostly the isoscalar giant monopole resonances, are studied within this model as well.
description: 23 pages, 12 figures
The Complete Work of Paolo Uccello
Creators: name: Ruhmer, Eberhard
Publisher: name: Kunstchronik. Monatsschrift für Kunstwissenschaft, Museumswesen und Denkmalpflege
Year: 2019

description: Rezension zu: John Pope Hennessy, The Complete Work of Paolo Uccello. 173 S., 108 S., XLII Abb. Phaidon Press, London 1950.
description: Kunstchronik. Monatsschrift für Kunstwissenschaft, Museumswesen und Denkmalpflege, Bd. 5 Nr. 11 (1952): Kunstchronik. Monatsschrift für Kunstwissenschaft, Museumswesen und Denkmalpflege