cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Magnetic moments of the low-lying {1/2}^- octet baryon resonances
Creators: name: Sharma, Neetika
name: Torres, A. Martínez
name: Khemchandani, K. P.
name: Dahiya, Harleen
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The magnetic moments of the negative parity octet resonances with spin {1/2}: $N^*$(1535), $N^*$(1650), $Σ^*$(1620), and $Ξ^*$(1690) have been calculated within the framework of the chiral constituent quark model. In this approach, the presence of the polarized $q\bar{q}$ pairs (or the meson cloud, in other words) is considered by using the Lagrangian for Goldstone boson emission from the constituent quarks. Further, the explicit contributions coming from the spin and orbital angular momentum, including the effects of the configurations mixing between the states with different spins, are obtained. The motivation for these calculations comes from the recent interest in experimental measurement of the magnetic moment of the ${S_{11}(1535)}$ resonance and of similar calculations being done within lattice quantum chromodynamics approaches. Our results can be compared with those expected to come from these sources.
description: 17 pages, 2 tables
Order-disorder transition and alignment dynamics of a block copolymer under high magnetic fields by in situ x-ray scattering
Creators: name: Gopinadhan, Manesh
name: Majewski, Pawel W.
name: Choo, Youngwoo
name: Osuji, Chinedum O.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We present results of temperature resolved scattering studies of a liquid crystalline block copolymer undergoing an order-disorder transition (ODT) in the presence of magnetic fields and time-resolved measurements during isothermal field annealing at sub-ODT temperatures. In each case, field interactions produced strongly textured mesophases with the cylindrical microdomains aligned parallel to the field. We find there is no measurable field-induced shift in the ODT temperature ($T_{ODT}$) which suggests that selective melting does not play a role in mesophase alignment during isothermal experiments. Our data indicate instead that sub-ODT alignment occurs by slow, large scale grain rotation whereas alignment during cooling from the disordered melt is rapid and driven by the nucleation of weakly ordered but preferentially aligned material. We identify an optimum sub-cooling that maximizes alignment during isothermal field annealing. This is corroborated by a simple model incorporating the competing effects of an exponentially decreasing mobility and divergent, increasing magnetic anisotropy on cooling below $T_{ODT}$. The absence of measurable field-effects on $T_{ODT}$ is consistent with rough estimates derived from the relative magnitudes of the free energy due to field interaction and the enthalpy of the isotropic-LC transition.
description: 5 figures; To appear in Physical Review Letters
Commuting varieties of $r$-tuples over Lie algebras
Creators: name: Ngo, Nham V.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Representation Theory (math.RT)
subject: Commutative Algebra (math.AC)
subject: FOS: Mathematics
subject: 20Gxx, 13C14

description: Let $G$ be a simple algebraic group defined over an algebraically closed field $k$ of characteristic $p$ and let $\g$ be the Lie algebra of $G$. It is well known that for $p$ large enough the spectrum of the cohomology ring for the $r$-th Frobenius kernel of $G$ is homeomorphic to the commuting variety of $r$-tuples of elements in the nilpotent cone of $\g$ [Suslin-Friedlander-Bendel, J. Amer. Math. Soc, \textbf{10} (1997), 693--728]. In this paper, we study both geometric and algebraic properties including irreducibility, singularity, normality and Cohen-Macaulayness of the commuting varieties $C_r(\mathfrak{gl}_2), C_r(\fraksl_2)$ and $C_r(\N)$ where $\N$ is the nilpotent cone of $\fraksl_2$. Our calculations lead us to state a conjecture on Cohen-Macaulayness for commuting varieties of $r$-tuples. Furthermore, in the case when $\g=\fraksl_2$, we obtain interesting results about commuting varieties when adding more restrictions into each tuple. In the case of $\fraksl_3$, we are able to verify the aforementioned properties for $C_r(\fraku)$. Finally, applying our calculations on the commuting variety $C_r(\overline{\calO_{\sub}})$ where $\overline{\calO_{\sub}}$ is the closure of the subregular orbit in $\fraksl_3$, we prove that the nilpotent commuting variety $C_r(\N)$ has singularities of codimension $\ge 2$.
description: To appear in Journal of Pure and Applied Algebra
The impact of baryons on the spins and shapes of dark matter haloes
Creators: name: Bryan, S. E.
name: Kay, S. T.
name: Duffy, A. R.
name: Schaye, J.
name: Vecchia, C. Dalla
name: Booth, C. M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We use numerical simulations to investigate how the statistical properties of dark matter (DM) haloes are affected by the baryonic processes associated with galaxy formation. We focus on how these processes influence the spin and shape of a large number of DM haloes covering a wide range of mass scales, from galaxies to clusters at redshifts zero and one, extending to dwarf galaxies at redshift two. The haloes are extracted from the OverWhelmingly Large Simulations, a suite of state-of-the-art high-resolution cosmological simulations run with a range of feedback prescriptions. We find that the median spin parameter in DM-only simulations is independent of mass, redshift and cosmology. At z=0 baryons increase the spin of the DM in the central region (<=0.25 r_200) by up to 30 per cent when feedback is weak or absent. This increase can be attributed to the transfer of angular momentum from baryons to the DM, but is no longer present at z=2. We also present fits to the mass dependence of the DM halo shape at both low and high redshift. At z=0 the sphericity (triaxiality) is negatively (positively) correlated with halo mass and both results are independent of cosmology. Interestingly, these mass-dependent trends are markedly weaker at z=2. While the cooling of baryons acts to make the overall DM halo more spherical, stronger feedback prescriptions tend to reduce the impact of baryons by reducing the central halo mass concentration. More generally, we demonstrate a strongly positive (negative) correlation between halo sphericity (triaxiality) and galaxy formation efficiency, with the latter measured using the central halo baryon fraction. In conclusion, our results suggest that the effects of baryons on the DM halo spin and shape are minor when the effects of cooling are mitigated, as required by realistic models of galaxy formation, although they remain significant for the inner halo.
description: 15 pages, 8 figures; accepted for publication in MNRAS
Gravity's weight on worldline fuzziness
Creators: name: Amelino-Camelia, Giovanni
name: Astuti, Valerio
name: Rosati, Giacomo
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We investigate a connection between recent results in 3D quantum gravity, providing an effective noncommutative-spacetime description, and some earlier heuristic descriptions of a quantum-gravity contribution to the fuzziness of the worldlines of particles. We show that 3D-gravity-inspired spacetime noncommutativity reflects some of the features suggested by previous heuristic arguments. Most notably, gravity-induced worldline fuzziness, while irrelevantly small on terrestrial scales, could be observably large for propagation of particles over cosmological distances.
description: 8 pages. This essay received an honorable mention in the 2012 Essay Competition of the Gravity Research Foundation
Strongly Incompatible Quantum Devices
Creators: name: Heinosaari, Teiko
name: Miyadera, Takayuki
name: Reitzner, Daniel
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The fact that there are quantum observables without a simultaneous measurement is one of the fundamental characteristics of quantum mechanics. In this work we expand the concept of joint measurability to all kinds of possible measurement devices, and we call this relation compatibility. Two devices are incompatible if they cannot be implemented as parts of a single measurement setup. We introduce also a more stringent notion of incompatibility, strong incompatibility. Both incompatibility and strong incompatibility are rigorously characterized and their difference is demonstrated by examples.
description: 27 pages (AMSart), 6 figures
Effects of a spin-flavour dependent interaction on light-flavoured baryon helicity amplitudes
Creators: name: Ronniger, Michael
name: Metsch, Bernard Ch.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: This paper is a continuation of previous work about the effects of a phenomenological flavour dependent force in a relativistically covariant constituent quark model based on the Salpeter equation on the structure of light-flavoured baryon resonances. Here the longitudinal and transverse helicity amplitudes as studied experimentally in the electro-excitation of nucleon- and $Δ$ resonances are calculated. In particular the amplitudes for the excitation of three and four star resonances as calculated in a previous model $\mathcal A$ are compared to those of the novel model $\mathcal C$ as well as to existing and partially new experimental data such as e.g. determined by the CB-ELSA collaboration. A brief discussion of some improvements to model $\mathcal C$ is given after the introduction.
description: 21 pages, 58 figures
Cohomology of locally-closed semi-algebraic subsets
Creators: name: Martin, Florent
Publisher: name: arXiv
Year: 2012
Subjects: subject: Algebraic Geometry (math.AG)
subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 14F20, 14G22

description: Let k be a non archimedean field. If X is a k-algebraic variety and U a locally closed semi-algebraic subset of X^{an} -- the Berkovich space associated to X -- we show that for l \neq char(\tilde{k}), the cohomology groups H^i_c (\bar{U}, Q_l) behave like H^i_c(\bar{X}, Q_l), where \bar{U} = U \otimes \hat{\bar{k}}. In particular, they are finite-dimensional vector spaces. This result has been used by E. Hrushovski and F. Loeser. Moreover, we prove analogous finiteness properties concerning rigid semi-analytic subsets of compact Berkovich spaces (resp. adic spaces associated to quasi-compact quasi-separated k-rigid spaces) when char(\tilde{k}) \neq 0 (resp in any characteristic).
description: We obtain a more general result using a recent cohomological finiteness result for affinoid spaces proved by Vladimir Berkovich
A Caldero-Chapoton formula for generalized Cluster Categories
Creators: name: Dominguez, Salomón
name: Geiss, Christof
Publisher: name: arXiv
Year: 2012
Subjects: subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 13F60, 18E30

description: The Caldero-Chapoton formula relates for hereditary algebras of Dynkin type the cluster characters of the end terms of an Auslander-Reiten sequence with the cluster character of the middle term. We extend this result to generalized cluster categories with cluster tilting object by considering Auslander-Reiten triangles.
description: 6 pages. v2: In example X C typo fixed and cross-references added. v3: small editorial changes. Final version to appear in J. Algebra
Market structure explained by pairwise interactions
Creators: name: Bury, Thomas
Publisher: name: arXiv
Year: 2012
Subjects: subject: Statistical Finance (q-fin.ST)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Economics and business
subject: FOS: Physical sciences

description: Financial markets are a typical example of complex systems where interactions between constituents lead to many remarkable features. Here, we show that a pairwise maximum entropy model (or auto-logistic model) is able to describe switches between ordered (strongly correlated) and disordered market states. In this framework, the influence matrix may be thought as a dissimilarity measure and we explain how it can be used to study market structure. We make the link with the graph-theoretic description of stock markets reproducing the non-random and scale-free topology, shrinking length during crashes and meaningful clustering features as expected. The pairwise model provides an alternative method to study financial networks which may be useful for characterization of abnormal market states (crises and bubbles), in capital allocation or for the design of regulation rules.
description: 14 pages, 14 figures
Bandwidth-Limited Control and Ringdown Suppression in High-Q Resonators
Creators: name: Borneman, Troy W.
name: Cory, David G.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We describe how the transient behavior of a tuned and matched resonator circuit and a ringdown suppression pulse may be integrated into an optimal control theory (OCT) pulse-design algorithm to derive control sequences with limited ringdown that perform a desired quantum operation in the presence of resonator distortions of the ideal waveform. Inclusion of ringdown suppression in numerical pulse optimizations significantly reduces spectrometer deadtime when using high quality factor (high-Q) resonators, leading to increased signal-to-noise ratio (SNR) and sensitivity of inductive measurements. To demonstrate the method, we experimentally measure the free-induction decay of an inhomogeneously broadened solid-state free radical spin system at high Q. The measurement is enabled by using a numerically optimized bandwidth-limited OCT pulse, including ringdown suppression, robust to variations in static and microwave field strengths. We also discuss the applications of pulse design in high-Q resonators to universal control of anisotropic-hyperfine coupled electron-nuclear spin systems via electron-only modulation even when the bandwidth of the resonator is significantly smaller than the hyperfine coupling strength. These results demonstrate how limitations imposed by linear response theory may be vastly exceeded when using a sufficiently accurate system model to optimize pulses of high complexity.
description: 20 pages, 5 figures; Replaced with version accepted for publication and added journal reference
Valley Degenerate 2D Electrons in the Lowest Landau Level
Creators: name: Kott, Tomasz M.
name: Hu, Binhui
name: Brown, S. H.
name: Kane, B. E.
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 report low temperature magnetotransport measurements on a high mobility (μ=325,000 cm^2/V sec) 2D electron system on a H-terminated Si(111) surface. While low magnetic field data indicate a six-fold valley degenerate system, we observe the integral quantum Hall effect at all filling factors ν<=6 and find that ν=2 develops in an unusually narrow temperature range. An extended, exclusively even numerator, fractional quantum Hall hierarchy occurs surrounding ν=3/2, consistent with two-fold valley-degenerate composite fermions (CFs). We determine activation energies and estimate the CF mass.
Reputation Aggregation in Peer-to-Peer Network Using Differential Gossip Algorithm
Creators: name: Gupta, Ruchir
name: Singh, Y. N.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: Social and Information Networks (cs.SI)
subject: FOS: Computer and information sciences

description: Reputation aggregation in peer to peer networks is generally a very time and resource consuming process. Moreover, most of the methods consider that a node will have same reputation with all the nodes in the network, which is not true. This paper proposes a reputation aggregation algorithm that uses a variant of gossip algorithm called differential gossip. In this paper, estimate of reputation is considered to be having two parts, one common component which is same with every node, and the other one is information received from immediate neighbours based on the neighbours' direct interaction with the node. The differential gossip is fast and requires less amount of resources. This mechanism allows computation of independent reputation value by a node, of every other node in the network, for each node. The differential gossip trust has been investigated for a power law network formed using preferential attachment \emph{(PA)} Model. The reputation computed using differential gossip trust shows good amount of immunity to the collusion. We have verified the performance of the algorithm on the power law networks of different sizes ranging from 100 nodes to 50,000 nodes.
Estimating gas accretion in disc galaxies using the Kennicutt-Schmidt law
Creators: name: Fraternali, Filippo
name: Tomassetti, Matteo
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We show how the existence of a relation between the star formation rate and the gas density, i.e. the Kennicutt-Schmidt law, implies a continuous accretion of fresh gas from the environment into the discs of spiral galaxies. We present a method to derive the gas infall rate in a galaxy disc as a function of time and radius, and we apply it to the disc of the Milky Way and 21 galaxies from the THINGS sample. For the Milky Way, we found that the ratio between the past and current star formation rates is about 2-3, averaged over the disc, but it varies substantially with radius. In the other disc galaxies there is a clear dependency of this ratio with galaxy stellar mass and Hubble type, with more constant star formation histories for small galaxies of later type. The gas accretion rate follows very closely the SFR for every galaxy and it dominates the evolution of these systems. The Milky Way has formed two thirds of its stars after z=1, whilst the mass of cold gas in the disc has remained fairly constant with time. In general, all discs have accreted a significant fraction of their gas after z=1. Accretion moves from the inner regions of the disc to the outer parts, and as a consequence star formation moves inside-out as well. At z=0 the peak of gas accretion in the Galaxy is at about 6-7 kpc from the centre.
description: 14 pages, 10 figures, accepted for publication in MNRAS
Non-embeddable 1-convex manifolds
Creators: name: Stevens, Jan
Publisher: name: arXiv
Year: 2012
Subjects: subject: Complex Variables (math.CV)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 32S45, 32F10, 32Q15, 32T15 13C20, 14E30

description: We show that every small resolution of a three-dimensional terminal hypersurface singularity can occur on a non-embeddable 1-convex manifold. We give an explicit example of a non-embeddable manifold containing an irreducible exceptional rational curve with normal bundle of type (1,-3). To this end we study small resolutions of cD_4-singularities.
description: 16 pages, 2 figures changes following referee report; some wrong formulas corrected
A weak type bound for a singular integral
Creators: name: Seeger, Andreas
Publisher: name: arXiv
Year: 2012
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 42B20

description: A weak type $(1,1)$ estimate is established for the first order $d$-commutator introduced by Christ and Journé, in dimension $d\ge 2$.
description: Minor corrections
Dipole-interacting Fermionic Dark Matter in positron, antiproton, and gamma-ray channels
Creators: name: Heo, Jae Ho
name: Kim, C. S.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Cosmic ray signals from dipole-interacting dark matter annihilation are considered in the positron, antiproton and photon channels. The predicted signals in the positron channel could nicely account for the excess of positron fraction from Fermi LAT, PAMELA, HEAT and AMS-01 experiments for the dark matter mass larger than 100 GeV with a boost (enhancement) factor of 30-80. No excess of antiproton over proton ratio at the experiments also gives a severe restriction for this scenario. With the boost factors, the predicted signals from Galactic halo and signals as mono-energetic gamma-ray lines (monochromatic photons) for the region close to the Galactic center are investigated. The gamma-ray excess of recent tentative analyses based on Fermi LAT data and the potential probe of the monochromatic lines at a planned experiment, AMS-02, are also considered.
description: Version to be published in PRD(2013), Title changed, text modified
Webs and quantum skew Howe duality
Creators: name: Cautis, Sabin
name: Kamnitzer, Joel
name: Morrison, Scott
Publisher: name: arXiv
Year: 2012
Subjects: subject: Representation Theory (math.RT)
subject: Quantum Algebra (math.QA)
subject: FOS: Mathematics

description: We give a diagrammatic presentation in terms of generators mod relations of the representation category of $U_q(\mathfrak{sl}_n)$. More precisely, we produce all the relations among $\rm{SL}_n$-webs, thus describing the full subcategory tensor-generated by fundamental representations $\bigwedge^k \mathbb{C}^n$ (this subcategory can be idempotent completed to recover the entire representation category). Our result answers a question posed by Kuperberg [arXiv:q-alg/9712003] and affirms conjectures of Kim [arXiv:math.QA/0310143] and Morrison [arXiv:0704.1503]. Our main tool is an application of quantum skew Howe duality.
description: 32 pages, added a missing relation which had been implicitly used; this version has the same content as the published version
Ultrafast dynamical path for the switching of a ferrimagnet after femtosecond heating
Creators: name: Atxitia, U.
name: Ostler, T.
name: Barker, J.
name: Evans, R. F. L.
name: Chantrell, R. W.
name: Chubykalo-Fesenko, O.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Ultrafast laser-induced magnetic switching in rare earth, transition metal ferrimagnetic alloys has recently been reported to occur by ultrafast heating alone. Using atomistic simulations and a ferrimagnetic Landau-Lifshitz-Bloch formalism, we demonstrate that for switching to occur it is necessary that angular momentum is transferred from the longitudinal to transverse magnetization components. This dynamical path leads to magnetization switching and subsequent ultrafast precession caused by the inter-sublattice exchange field on the nanoscale.
Calculation of divergent photon absorption in ultrathin films of a topological insulator
Creators: name: Wang, Jing
name: Mabuchi, Hideo
name: Qi, Xiao-Liang
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We perform linear and non-linear photon absorption calculations in topological insulator ultra-thin films on a substrate. Due to the unique band structure of the coupled topological surface states, novel features are observed for suitable photon frequencies, including a divergent edge singularity in one-photon absorption process and a significantly enhancement in two-photon absorption process. The resonanct frequencies can be controlled by tuning the energy difference and coupling of the top and bottom surface states. Such unique linear and nonlinear optical properties make ultra-thin films of topological insulators promising material building blocks for tunable high-efficiency nanophotonic devices.
description: 6 pages, 3 figures
Asymptotic properties of MUSIC-type imaging in two-dimensional inverse scattering from thin electromagnetic inclusions
Creators: name: Park, Won-Kwang
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: The main purpose of this paper is to study the structure of the well-known non-iterative MUltiple SIgnal Classification (MUSIC) algorithm for identifying the shape of extended electromagnetic inclusions of small thickness located in a two-dimensional homogeneous space. We construct a relationship between the MUSIC-type imaging functional for thin inclusions and the Bessel function of integer order of the first kind. Our construction is based on the structure of the left singular vectors of the collected multistatic response matrix whose elements are the measured far-field pattern and the asymptotic expansion formula in the presence of thin inclusions. Some numerical examples are shown to support the constructed MUSIC structure.
description: 19 pages, 7 figures
Efficiency bounds for nonequilibrium heat engines
Creators: name: Mehta, Pankaj
name: Polkovnikov, Anatoli
Publisher: name: arXiv
Year: 2012
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We analyze the efficiency of thermal engines (either quantum or classical) working with a single heat reservoir like atmosphere. The engine first gets an energy intake, which can be done in arbitrary non-equilibrium way e.g. combustion of fuel. Then the engine performs the work and returns to the initial state. We distinguish two general classes of engines where the working body first equilibrates within itself and then performs the work (ergodic engine) or when it performs the work before equilibrating (non-ergodic engine). We show that in both cases the second law of thermodynamics limits their efficiency. For ergodic engines we find a rigorous upper bound for the efficiency, which is strictly smaller than the equivalent Carnot efficiency. I.e. the Carnot efficiency can be never achieved in single reservoir heat engines. For non-ergodic engines the efficiency can be higher and can exceed the equilibrium Carnot bound. By extending the fundamental thermodynamic relation to nonequilibrium processes, we find a rigorous thermodynamic bound for the efficiency of both ergodic and non-ergodic engines and show that it is given by the relative entropy of the non-equilibrium and initial equilibrium distributions.These results suggest a new general strategy for designing more efficient engines. We illustrate our ideas by using simple examples.
description: updated version, 16 pages, 3 figures
Charlotte Denoël, Anne-Orange Poilpré, Sumi Shimahara (dir.), Imago libri. Représentations carolingiennes du livre, Turnhout (Brepols) 2018
Creators: name: Demès, Raphaël
Publisher: name: Francia-Recensio
Year: 2019

description: Charlotte Denoël, Anne-Orange Poilpré, Sumi Shimahara (dir.), Imago libri. Représentations carolingiennes du livre, Turnhout (Brepols) 2018, 335 p., 26 ill. en n/b, 96 en coul. (Bibliologia. Elementa ad librorum studia pertinentia, 47), ISBN 978-2-503-56767-9, EUR 85,00.
description: Francia-Recensio, 2019/3
Heavy neutrino decays at MiniBooNE
Creators: name: Masip, Manuel
name: Masjuan, Pere
name: Meloni, Davide
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: It has been proposed that a sterile neutrino ν_h with m_h \approx 50 MeV and a dominant decay mode (ν_h -> νγ) may be the origin of the experimental anomaly observed at LSND. We define a particular model that could also explain the MiniBooNE excess consistently with the data at other neutrino experiments (radiative muon capture at TRIUMF, T2K, or single photon at NOMAD). The key ingredients are (i) its long lifetime (τ_h\approx 3-7x10^{-9} s), which introduces a 1/E dependence with the event energy, and (ii) its Dirac nature, which implies a photon preferably emitted opposite to the beam direction and further reduces the event energy at MiniBooNE. We show that these neutrinos are mostly produced through electromagnetic interactions with nuclei, and that T2K observations force BR(ν_h -> ν_τγ) \le 0.01 \approx BR(ν_h -> ν_μγ). The scenario implies then the presence of a second sterile neutrino ν_{h'} which is lighter, longer lived and less mixed with the standard flavors than ν_h. Since such particle would be copiously produced in air showers through (ν_h -> ν_{h'}γ) decays, we comment on the possible contamination that its photon-mediated elastic interactions with matter could introduce in dark matter experiments.
description: 18 pages, typo in Eq.(6) corrected
Probing the Anomalous Couplings of the Top Quark with Gluon at the LHC and Tevatron
Creators: name: Hesari, Hoda
name: Najafabadi, Mojtaba Mohammadi
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this paper, we study the sensitivity of the fraction of $t\bar{t}$ events arising from gluon-gluon fusion to the chromoelectric and chromomagnetic dipole moments (CEDM and CMDM) as well as the total and differential $t\bar{t}$ cross sections at the LHC and Tevatron. The sensitivity of measured charged asymmetry at the LHC to CEDM and CMDM is also studied. We find that at the Tevatron and the LHC, non-zero values of CMDM could suppress the $t\bar{t}$ production rate. It is shown that the ratio of $σ(gg\rightarrow t\bar{t})/σ(p\bar{p}\rightarrow t\bar{t})$ at the Tevatron is more sensitive to CEDM and CMDM than the LHC case. The presence of CEDM always increases the contribution of gluon-gluon fusion process in top pair rate at the Tevatron and LHC. Except for a small range of CMDM, the presence of CEDM and CMDM can increase the fraction of gluon-gluon fusion at the Tevatron and LHC. The measured ratio of $σ(gg\rightarrow t\bar{t})/σ(p\bar{p}\rightarrow t\bar{t})$ at the Tevatron is used to derive bounds on the chromoelectric and chromomagnetic dipole moments as well as the total and differential ($dσ/dm_{t\bar{t}}$) cross sections at the LHC and Tevatron, and the measured charged asymmetry at the LHC. The combination of $dσ_{TeV}/dm_{t\bar{t}}$ and $σ_{LHC}$ provides stringent limits on CMDM and CEDM.
description: 11 pages,6 figures,2 tables
Jan Habermann (Hg.), Kaiser Heinrich III. Regierung, Reich und Rezeption, Gütersloh (Verlag für Regionalgeschichte) 2018
Creators: name: Ehlers, Caspar
Publisher: name: Francia-Recensio
Year: 2019

description: Jan Habermann (Hg.), Kaiser Heinrich III. Regierung, Reich und Rezeption, Gütersloh (Verlag für Regionalgeschichte) 2018, 216 S., 66 s/w u. farb. Abb. (Beiträge zur Geschichte der Stadt Goslar. Goslarer Fundus, 59), ISBN 978-3-7395-1159-7, EUR 19,00.
description: Francia-Recensio, 2019/3
Leptonic decay of Heavy-light Mesons in a QCD Potential Model
Creators: name: Pathak, Krishna Kingkar
name: Choudhury, D. K.
name: Bordoloi, N. S.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the masses and decay constants of heavy-light flavour mesons D, Ds, B and Bs in a QCD Potential model. The mesonic wavefunction is used to compute the masses of D and B mesons in the ground state and the wavefunction is transformed to momentum space to estimate the pseudoscalar decay constants of these mesons. The leptonic decay widths and branching ratio of these mesons for different leptonic channels are also computed to compare with the experimental values. The results are found to be compatible with available data.
description: 9 pages,3 tables
Geoffrey Koziol, The Peace of God, Leeds (Arc Humanities Press) 2018
Creators: name: Goetz, Hans-Werner
Publisher: name: Francia-Recensio
Year: 2019

description: Geoffrey Koziol, The Peace of God, Leeds (Arc Humanities Press) 2018, X–141 p., 2 maps (Past Imperfect) ISBN 978-1-94240-137-7, GBP 11,95.
description: Francia-Recensio, 2019/3
Éric Schnakenbourg, Les entrées en guerre à l’époque moderne. XVIe–XVIIIe siècle, Rennes (Presses universitaires de Rennes) 2018
Creators: name: Tischer, Anuschka
Publisher: name: Francia-Recensio
Year: 2019

description: Éric Schnakenbourg, Les entrées en guerre à l’époque moderne. XVIe–XVIIIe siècle, Rennes (Presses universitaires de Rennes) 2018, 178 p., ISBN 978-2-7535-7448-9, EUR 22,00.
description: Francia-Recensio, 2019/3
title: Botanic Gardens Micropropagation News, Volume 2, Issue 3.
Creators: name: Royal Botanic Gardens, Kew
Publisher: name: Royal Botanic Gardens, Kew
Year: 1998
Subjects: Atropa baetica
Micropropagation
Shoot culture
In vitro culture
In vitro propagation
Trochetia boutoniana
Astragalus
Germplasm conservation

description: Contents: [Editorial] / Margaret M. Ramsay. Shoot culture of Astragalus: toward conserving a threatened genus / J.L. Edson, R.L. Everett, D.H. Wenny and D.M. Henderson. In vitro germplasm conservation of Atropa baetica by cold storage / M. Cantos, R. Zárate and A. Troncoso. In vitro culture of Trochetia boutoniana / D. Puchoosa, G.N. Sooben and K. Lindsay. Forthcoming meetings/Requests for information. Recent references.
description: Kew, UK
Johann Conrad Wagner, »Meine Erfahrungen in dem gegenwärtigen Kriege«. Tagebuch des Feldzugs mit Herzog Carl August von Weimar. Herausgegeben von Edith Zehm. Mit einer Einführung von Gustav Seibt, Göttingen (Wallstein) 2018
Creators: name: Pille, René-Marc
Publisher: name: Francia-Recensio
Year: 2019

description: Johann Conrad Wagner, »Meine Erfahrungen in dem gegenwärtigen Kriege«. Tagebuch des Feldzugs mit Herzog Carl August von Weimar. Herausgegeben von Edith Zehm. Mit einer Einführung von Gustav Seibt, Göttingen (Wallstein) 2018, 552 S., 71, z. T. farb. Abb., 1 Kt. (Schriften der Goethe-Gesellschaft, 78), ISBN 978-3-8353-3356-7, EUR 59,00.
description: Francia-Recensio, 2019/3
The Dirichlet heat kernel in inner uniform domains: local results, compact domains and non-symmetric forms
Creators: name: Lierl, Janna
name: Saloff-Coste, Laurent
Publisher: name: arXiv
Year: 2012
Subjects: subject: Functional Analysis (math.FA)
subject: Analysis of PDEs (math.AP)
subject: Probability (math.PR)
subject: FOS: Mathematics

description: This paper provides sharp Dirichlet heat kernel estimates in inner uniform domains, including bounded inner uniform domains, in the context of certain (possibly non-symmetric) bilinear forms resembling Dirichlet forms. For instance, the results apply to the Dirichlet heat kernel associated with a uniformly elliptic divergence form operator with symmetric second order part and bounded measurable coefficients in inner uniform domains in $\mathbb R^n$. The results are applicable to any convex domain, to the complement of any convex domain, and to more exotic examples such as the interior and exterior of the snowflake.
description: Revision
Magnetic vortices induced by a moving tip
Creators: name: Magiera, Martin P.
name: Hucht, Alfred
name: Hinrichsen, Haye
name: Dahmen, Silvio R.
name: Wolf, Dietrich E.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: A two-dimensional easy-plane ferromagnetic substrate, interacting with a dipolar tip which is magnetised perpendicular with respect to the easy plane is studied numerically by solving the Landau-Lifshitz Gilbert equation. Due to the symmetry of the dipolar field of the tip, in addition to the collinear structure a magnetic vortex structure becomes stable. It is robust against excitations caused by the motion of the tip. We show that for high excitations the system may perform a transition between the two states. The influence of domain walls, which may also induce this transition, is examined.
description: 6 pages, 7 figures
Johannes Willms, Napoleon, München (C. H. Beck) 2019
Creators: name: Kerautret, Michel
Publisher: name: Francia-Recensio
Year: 2019

description: Johannes Willms, Napoleon, München (C. H. Beck) 2019, 129 S., 2 s/w Kt. (C. H. Beck Wissen, 2893), ISBN 978-3-406-73479-3, EUR 9,95.
description: Francia-Recensio, 2019/3
Jon D. Wood, Reforming Priesthood in Reformation Zurich. Heinrich Bullinger’s End-Times Agenda, Göttingen (Vandenhoeck & Ruprecht) 2018
Creators: name: Schneider-Böklen, Elisabeth
Publisher: name: Francia-Recensio
Year: 2019

description: Jon D. Wood, Reforming Priesthood in Reformation Zurich. Heinrich Bullinger’s End-Times Agenda, Göttingen (Vandenhoeck & Ruprecht) 2018, 150 p. (Reformed Historical Theology, 54), ISBN 978-3-525-57092-0, EUR 50,00.
description: Francia-Recensio, 2019/3
John H. Arnold, Matthew Hilton, Jan Rüger, History after Hobsbawm. Writing the Past for the Twenty-First Century, Oxford (Oxford University Press) 2017
Creators: name: Casquete, Jesus
Publisher: name: Francia-Recensio
Year: 2019

description: John H. Arnold, Matthew Hilton, Jan Rüger, History after Hobsbawm. Writing the Past for the Twenty-First Century, Oxford (Oxford University Press) 2017, X–352 p., 27 pl., 2 maps, 1 tabl., ISBN 978-0-19-876878-4, GBP 75,00.
description: Francia-Recensio, 2019/3
Johann Chapoutot, Comprendre le nazisme, Paris (Tallandier) 2018
Creators: name: Crips, Liliane
Publisher: name: Francia-Recensio
Year: 2019

description: Johann Chapoutot, Comprendre le nazisme, Paris (Tallandier) 2018, 426 p., ISBN 979-10-210-3042-8, EUR 21,90.
description: Francia-Recensio, 2019/3
Sonja Dinter, Die Macht der historischen Handlung. Sklaverei und Emanzipation in der britischen und französischen Erinnerungskultur seit Ende der 1990er Jahre, Bielefeld (transcript) 2018
Creators: name: Rausch, Sarah
Publisher: name: Francia-Recensio
Year: 2019

description: Sonja Dinter, Die Macht der historischen Handlung. Sklaverei und Emanzipation in der britischen und französischen Erinnerungskultur seit Ende der 1990er Jahre, Bielefeld (transcript) 2018, 544 S. (Histoire, 35), ISBN 978-3-8376-4325-1, EUR 49,99.
description: Francia-Recensio, 2019/3
Higgs boson discovery versus sparticles prediction: Impact on the pMSSM's posterior samples from a Bayesian global fit
Creators: name: AbdusSalam, Shehu S.
name: Choudhury, Debajyoti
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The signal strength of the recently discovered Higgs boson-like particle in the diphoton channel seemingly constrains physics beyond the standard model to a severe degree. However, the reported signal strength is prone to possible underestimation of uncertainties. We propose a discriminant that is relatively free of many of the theoretical uncertainties, and use this to gauge the impact on the phenomenological MSSM. A Bayesian global fit to all the pre-LHC data results in posterior distributions for the masses that are neither very restrictive, nor sufficiently prior-independent (except for the Higgs and stop masses). The imposition of the Higgs data, on the other hand, yields interesting and nearly prior-independent constraints. In particular, the existence of some light superpartners is favoured.
description: v2: added references and minor changes, published version
Markus Gerstmeier, Anton Schindling (Hg.), Ernst Walter Zeeden (1916–2011) als Historiker der Reformation, Konfessionsbildung und »deutschen Kultur«. Relektüren eines geschichtswissenschaftlichen Vordenkers, Münster (Aschendorff) 2016
Creators: name: Duhamelle, Christophe
Publisher: name: Francia-Recensio
Year: 2019

description: Markus Gerstmeier, Anton Schindling (Hg.), Ernst Walter Zeeden (1916–2011) als Historiker der Reformation, Konfessionsbildung und »deutschen Kultur«. Relektüren eines geschichtswissenschaftlichen Vordenkers, Münster (Aschendorff) 2016, 250 S., 15 Abb. (Katholisches Leben und Kirchenreform im Zeitalter der Glaubensspaltung, 76), ISBN 978-3-402-11095-9, EUR 24,80.
description: Francia-Recensio, 2019/3
Frank Reichherzer, Emmanuel Droit, Jan Hansen (Hg.), Den Kalten Krieg vermessen. Über Reichweite und Alternativen einer binären Ordnungsvorstellung, Berlin (De Gruyter Oldenbourg) 2018
Creators: name: Gassert, Philipp
Publisher: name: Francia-Recensio
Year: 2019

description: Frank Reichherzer, Emmanuel Droit, Jan Hansen (Hg.), Den Kalten Krieg vermessen. Über Reichweite und Alternativen einer binären Ordnungsvorstellung, Berlin (De Gruyter Oldenbourg) 2018, VIII–317 S., ISBN 978-3-11-048180-8, EUR 59,95.
description: Francia-Recensio, 2019/3
Bifurcation in a multi-component system of nonlinear Schrödinger equations
Creators: name: Bartsch, Thomas
Publisher: name: arXiv
Year: 2012
Subjects: subject: Analysis of PDEs (math.AP)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 35B05, 35B32, 35J50, 35J55, 58C40, 58E07

description: We consider the system -Δu_j + a(x)u_j = μ_j u_j^3 + \be\sum_{k\ne j}u_k^2u_j, u_j>0, \qquad j=1,...,n, on a possibly unbounded domain $\Om\subset\R^N$, $N\le3$, with Dirichlet boundary conditions. The system appears in nonlinear optics and in the analysis of mixtures of Bose-Einstein condensates. We consider the self-focussing (attractive self-interaction) case $μ_1,...,μ_n > 0$ and take $\be\in\R$ as bifurcation parameter. There exists a branch of positive solutions with $u_j/u_k$ being constant for all $j,k\in{1,...,n}$. The main results are concerned with the bifurcation of solutions from this branch. Using a hidden symmetry we are able to prove global bifurcation even when the linearization has even-dimensional kernel (which is always the case when $n>1$ is odd).
description: 17 pages
Sabine Hornung, Die südliche Hunsrück-Eifel-Kultur
Creators: name: Verse, Frank
Publisher: name: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts
Year: 2019

description: Rezension zu: Sabine Hornung, Die südliche Hunsrück-Eifel-Kultur. Studien zur Späthallstatt- und Frühlatènezeit in der deutschen Mittelgebirgsregion. Universitätsforschungen zur Prähistorischen Archäologie Band 153, Teil 1 und 2. Verlag Dr. Rudolf Habelt, Bonn 2008. ISBN 978-3-7749-3462-7. 562 Seiten, 186 Abbildungen, 6 Tabellen und 256 Tafeln
description: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts, Bd. 89 2011(2013)
Esther Maria Lehnemann, Das Gräberfeld von Lünen-Wethmar, Kr. Unna
Creators: name: Grünewald, Christoph
Publisher: name: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts
Year: 2019

description: Rezension zu: Esther Maria Lehnemann, Das Gräberfeld von Lünen-Wethmar, Kr. Unna. Kultureller Wandel im Spiegel frühmittelalterlicher Bestattungssitten. Internationale Archäologie Band 108. Verlag Marie Leidorf, Rahden/ Westf. 2008. ISBN 978-3-89646-380-7. 496 Seiten mit 2 Abbildungen, 4 Tabellen, 4 Listen, 32 Karten, 39 Tafeln und einer Beilage
description: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts, Bd. 89 2011(2013)
Coadjoint Orbits and Wigner functions of (1+1)-Extended Affine Galilei Group and Galilei Group
Creators: name: Chowdhury, S. Hasibul Hassan
name: Ali, S. Twareque
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mathematical Physics (math-ph)
subject: Representation Theory (math.RT)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We study the coadjoint orbits of the noncentrally extended (1+1)-affine Galilei group and compute the relevant Wigner functions built on them explicitly. We consider the centrally extended (1+1)-Galilei group and study its coadjoint orbits in the second half of the paper. We also compute the Wigner functions built on the corresponding coadjoint orbits subsequently. Finally, a comparative study of the structure of the coadjoint orbits and corresponding Wigner functions between the extended (1+1)-affine Galilei group and the centrally extended (1+1)-Galilei group is presented along with possible physical interpretations.
description: 43 pages, 2 figures, minor changes made in the introduction and final section, figures modified
Seeable universe and its accelerated expansion: an observational test
Creators: name: Alfonso-Faus, Antonio
name: Alfonso, Màrius Josep Fullana i
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: From the equivalence principle, one gets the strength of the gravitational effect of a mass $M$ on the metric at position r from it. It is proportional to the dimensionless parameter $β^2 = 2GM/rc^2$, which normally is $<< 1$. Here $G$ is the gravitational constant, $M$ the mass of the gravitating body, $r$ the position of the metric from the gravitating body and $c$ the speed of light. The seeable universe is the sphere, with center at the observer, having a size such that it shall contain all light emitted within it. For this to occur one can impose that the gravitational effect on the velocity of light at $r$ is zero for the radial component, and non zero for the tangential one. Light is then trapped. The condition is given by the equality $R_g = 2GM/c^2$, where $R_g$ represents the radius of the {\it seeable} universe. It is the gravitational radius of the mass $M$. The result has been presented elsewhere as the condition for the universe to be treated as a black hole. According to present observations, for the case of our universe taken as flat ($k = 0$), and the equation of state as $p = - ρc^2$, we prove here from the Einstein's cosmological equations that the universe is expanding in an accelerated way as $t^2$, a constant acceleration as has been observed. This implies that the gravitational radius of the universe (at the event horizon) expands as $t^2$. Taking $c$ as constant, observing the galaxies deep in space this means deep in time as $ct$, linear. Then, far away galaxies from the observer that we see today will disappear in time as they get out of the distance ct that is $< R_g$. The accelerated expanding vacuum will drag them out of sight. This may be a valid test for the present ideas in cosmology. Previous calculations are here halved by our results.
description: 15 pages, 2 figures
Reconfigurable THz Plasmonic Antenna Concept Using a Graphene Stack
Creators: name: Tamagnone, Michele
name: Diaz, Juan Sebastian Gomez
name: Mosig, Juan Ramon
name: Perruisseau-Carrier, Julien
Publisher: name: arXiv
Year: 2012
Subjects: subject: Optics (physics.optics)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The concept and analysis of a Terahertz (THz) frequency-reconfigurable antenna using graphene are presented. The antenna exploits dipole-like plasmonic resonances that can be frequency-tuned on large range via the electric field effect in a graphene stack. In addition to efficient dynamic control, the proposed approach allows high miniaturization and good direct matching with continuous wave THz sources. A qualitative model is used to explain the excellent impedance stability under reconfiguration. These initial results are very promising for future all-graphene THz transceivers and sensors. Keywords: Reconfigurable antenna, Graphene, Plasmons, Terahertz, frequency-tuning.
description: 4 pages, 7 Figures, Equation (7) modified in version 2. Published in Applied Physics Letters