cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Average characteristic polynomials in the two-matrix model
Creators: name: Delvaux, Steven
Publisher: name: arXiv
Year: 2010
Subjects: subject: Mathematical Physics (math-ph)
subject: Classical Analysis and ODEs (math.CA)
subject: Complex Variables (math.CV)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: The two-matrix model is defined on pairs of Hermitian matrices $(M_1,M_2)$ of size $n\times n$ by the probability measure $$\frac{1}{Z_n} \exp\left(\textrm{Tr} (-V(M_1)-W(M_2)+τM_1M_2)\right)\ dM_1\ dM_2, $$ where $V$ and $W$ are given potential functions and $τ\in\er$. We study averages of products and ratios of characteristic polynomials in the two-matrix model, where both matrices $M_1$ and $M_2$ may appear in a combined way in both numerator and denominator. We obtain determinantal expressions for such averages. The determinants are constructed from several building blocks: the biorthogonal polynomials $p_n(x)$ and $q_n(y)$ associated to the two-matrix model; certain transformed functions $¶_n(w)$ and $\Q_n(v)$; and finally Cauchy-type transforms of the four Eynard-Mehta kernels $K_{1,1}$, $K_{1,2}$, $K_{2,1}$ and $K_{2,2}$. In this way we generalize known results for the $1$-matrix model. Our results also imply a new proof of the Eynard-Mehta theorem for correlation functions in the two-matrix model, and they lead to a generating function for averages of products of traces.
description: 28 pages, references added
Bumpy Riemannian metrics and closed parametrized minimal surfaces in Riemannian manifolds
Creators: name: Moore, John Douglas
Publisher: name: arXiv
Year: 2010
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics

description: This article proves that if M is a smooth manifold of dimension at least four, then for generic choice of metric on M, all prime parametrized minimal surfaces in M are free of branch points and lie on nondegenerate critical submanifolds for the two-variable energy function which have the same dimension as the group of complex automorphisms of the domain Riemann surface.
description: 78 pages, 1 figure; revised arguments in sections 7.3, 7.4 and 9
Spreading paths in partially observed social networks
Creators: name: Onnela, Jukka-Pekka
name: Christakis, Nicholas A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Social and Information Networks (cs.SI)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Understanding how and how far information, behaviors, or pathogens spread in social networks is an important problem, having implications for both predicting the size of epidemics, as well as for planning effective interventions. There are, however, two main challenges for inferring spreading paths in real-world networks. One is the practical difficulty of observing a dynamic process on a network, and the other is the typical constraint of only partially observing a network. Using a static, structurally realistic social network as a platform for simulations, we juxtapose three distinct paths: (1) the stochastic path taken by a simulated spreading process from source to target; (2) the topologically shortest path in the fully observed network, and hence the single most likely stochastic path, between the two nodes; and (3) the topologically shortest path in a partially observed network. In a sampled network, how closely does the partially observed shortest path (3) emulate the unobserved spreading path (1)? Although partial observation inflates the length of the shortest path, the stochastic nature of the spreading process also frequently derails the dynamic path from the shortest path. We find that the partially observed shortest path does not necessarily give an inflated estimate of the length of the process path; in fact, partial observation may, counterintuitively, make the path seem shorter than it actually is.
description: 12 pages, 9 figures, 1 table
Implications of different supersymmetry breaking patterns for the spectrum and decay of neutralinos and charginos
Creators: name: Huitu, Katri
name: Laamanen, Jari
name: Pandita, P. N.
name: Tiitola, Paavo
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We consider different patterns of supersymmetry breaking gaugino masses, and implications of these patterns for the phenomenology of neutralinos and charginos in models of low energy supersymmetry. We outline a general procedure for obtaining approximate values for the neutralino masses relevant for our analysis, and describe the constraints on the gaugino mass parameters which follow from the present experimental limits on the mass of the lightest chargino. We evaluate an upper bound on the mass of the lightest neutralino that follows from the structure of the mass matrix in different models for the gaugino mass parameters. Using the experimental lower limit for the chargino mass, we examine the lower bound for the neutralino masses. Using a sum rule for the squared masses of charginos and neutralinos, we discuss how to distinguish between different models for the supersymmetry breaking scenarios. We discuss in detail the decay modes of neutralinos and charginos in different models of supersymmetry breaking. Our analysis shows that by measuring the masses and decay properties of the neutralinos, one can distinguish between different patterns of supersymmetry breaking in the gaugino sector. We then compare the dark matter characteristics that arise in different models of supersymmetry breaking.
description: 21 pages, 12 figures, version to appear in Physical Review D
Transport through quantum-dot spin valves containing magnetic impurities
Creators: name: Sothmann, Björn
name: König, Jürgen
Publisher: name: arXiv
Year: 2010
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We investigate transport through a single-level quantum dot coupled to noncollinearly magnetized ferromagnets in the presence of localized spins in either the tunnel barrier or on the quantum dot. For a spin embedded in the tunnel barrier, we find an interplay between current-induced switching of the spin, spin-dependent tunneling through the barrier and spin accumulation on the dot resulting in characteristic signals in the current. We, furthermore, find huge Fano factors due to random telegraph noise. For noncollinear geometries, an exchange field that depends on the impurity spin state leads to characteristic fingerprints in the transport properties. In the case of a spin on the quantum dot, we find that the frequency-dependent Fano factor can be used to study the nontrivial dynamics of the spins on the dot due to the interplay between exchange interaction and coupling to external and exchange magnetic fields.
description: 25 pages, 14 figures
Three-parameter Lorentz-violating texture for neutrino mixing
Creators: name: Diaz, Jorge S.
name: Kostelecky, Alan
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: A three-parameter model of neutrino oscillations based on a simple Lorentz- and CPT-violating texture is presented. The model is consistent with established data and naturally generates low-energy and neutrino-antineutrino anomalies of the MiniBooNE type. A one-parameter extension incorporates the MINOS anomaly, while a simple texture enhancement accommodates the LSND signal.
description: 5 pages, accepted for publication in Physics Letters B
Quark and Gluon Tagging at the LHC
Creators: name: Gallicchio, Jason
name: Schwartz, Matthew D.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Being able to distinguish light-quark jets from gluon jets on an event-by-event basis could significantly enhance the reach for many new physics searches at the Large Hadron Collider. Through an exhaustive search of existing and novel jet substructure observables, we find that a multivariate approach can filter out over 95% of the gluon jets while keeping more than half of the light-quark jets. Moreover, a combination of two simple variables, the charge track multiplicity and the $p_T$-weighted linear radial moment (girth), can achieve similar results. While this pair appears very promising, our study is only Monte Carlo based, and other discriminants may work better with real data in a realistic experimental environment. To that end, we explore many other observables constructed using different jet sizes and parameters, and highlight those that deserve further theoretical and experimental scrutiny. Additional information, including distributions of around 10,000 variables, can be found on this website http://jets.physics.harvard.edu/qvg .
description: 5 pages, 3 figures. v2 published version
Disentangling transverse single spin asymmetries for very forward neutrons in polarized p+A collisions using ultra-peripheral collisions
Creators: name: Mitsuka, Gaku
Publisher: name: Zenodo
Year: 2021
Subjects: dis17
phenix
forward-rapidity
neutron
transverse spin asymmetry
upc
p+p
p+al
p+au
run15
zdc
smd

description: Talk presented at the Deep Inelastic Scattering 2017 conference
Apparent high metallicity in 3-4 keV galaxy clusters: the inverse iron-bias in action in the case of the merging cluster Abell 2028
Creators: name: Gastaldello, F.
name: Ettori, S.
name: Balestra, I.
name: Brighenti, F.
name: Buote, D. A.
name: De Grandi, S.
name: Ghizzardi, S.
name: Gitti, M.
name: Tozzi, P.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Recent work based on a global measurement of the ICM properties find evidence for an increase of the iron abundance in galaxy clusters with temperature around 2-4 keV up to a value about 3 times larger than that typical of very hot clusters. We have started a study of the metal distribution in these objects from the sample of Baumgartner et al. (2005), aiming at resolving spatially the metal content of the ICM. We report here on a 42ks XMM observation of the first object of the sample, the cluster Abell 2028. The XMM observation reveals a complex structure of the cluster over scale of 300 kpc, showing an interaction between two sub-clusters in cometary-like configurations. At the leading edges of the two substructures cold fronts have been detected. The core of the main subcluster is likely hosting a cool corona. We show that a one-component fit for this region returns a biased high metallicity. This inverse iron bias is due to the behavior of the fitting code in shaping the Fe-L complex. In presence of a multi-temperature structure of the ICM, the best-fit metallicity is artificially higher when the projected spectrum is modeled with a single temperature component and it is not related to the presence of both Fe-L and Fe-K emission lines in the spectrum. After accounting for the bias, the overall abundance of the cluster is consistent with the one typical of hotter, more massive clusters. We caution the interpretation of high abundances inferred when fitting a single thermal component to spectra derived from relatively large apertures in 3-4 keV clusters, because the inverse iron bias can be present. Most of the inferences trying to relate high abundances in 3-4 keV clusters to fundamental physical processes will likely have to be revised.
description: 13 pages, 8 figures.Accepted for publication in Astronomy and Astrophysycs. Minor changes to match published version
AGT on the S-duality Wall
Creators: name: Hosomichi, Kazuo
name: Lee, Sungjay
name: Park, Jaemo
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Three-dimensional gauge theory T[G] arises on a domain wall between four-dimensional N=4 SYM theories with the gauge groups G and its S-dual G^L. We argue that the N=2^* mass deformation of the bulk theory induces a mass-deformation of the theory T[G] on the wall. The partition functions of the theory T[SU(2)] and its mass-deformation on the three-sphere are shown to coincide with the transformation coefficient of Liouville one-point conformal block on torus under the S-duality.
description: 14 pages, 3 figures. v2: Revised the analysis in sections 3.3 and 4. Notes and references added. Version to appear in JHEP
Classical Analogue of Electromagnetically Induced Transparency with a Metal-Superconductor Hybrid Metamaterial
Creators: name: Kurter, Cihan
name: Tassin, Philippe
name: Zhang, Lei
name: Koschny, Thomas
name: Zhuravel, Alexander P.
name: Ustinov, Alexey V.
name: Anlage, Steven M.
name: Soukoulis, Costas M.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Metamaterials are engineered materials composed of small electrical circuits producing novel interactions with electromagnetic waves. Recently, a new class of metamaterials has been created to mimic the behavior of media displaying electromagnetically induced transparency (EIT). Here we introduce a planar EIT metamaterial that creates a very large loss contrast between the dark and radiative resonators by employing a superconducting Nb film in the dark element and a normal-metal Au film in the radiative element. Below the critical temperature of Nb, the resistance contrast opens up a transparency window along with a large enhancement in group delay, enabling a significant slowdown of waves. We further demonstrate precise control of the EIT response through changes in the superfluid density. Such tunable metamaterials may be useful for telecommunication because of their large delay-bandwidth products.
description: 4 pages, 4 figures
Finding statistically significant communities in networks
Creators: name: Lancichinetti, Andrea
name: Radicchi, Filippo
name: Ramasco, Jose' Javier
name: Fortunato, Santo
Publisher: name: arXiv
Year: 2010
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Information Retrieval (cs.IR)
subject: Social and Information Networks (cs.SI)
subject: Quantitative Methods (q-bio.QM)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences
subject: FOS: Biological sciences

description: Community structure is one of the main structural features of networks, revealing both their internal organization and the similarity of their elementary units. Despite the large variety of methods proposed to detect communities in graphs, there is a big need for multi-purpose techniques, able to handle different types of datasets and the subtleties of community structure. In this paper we present OSLOM (Order Statistics Local Optimization Method), the first method capable to detect clusters in networks accounting for edge directions, edge weights, overlapping communities, hierarchies and community dynamics. It is based on the local optimization of a fitness function expressing the statistical significance of clusters with respect to random fluctuations, which is estimated with tools of Extreme and Order Statistics. OSLOM can be used alone or as a refinement procedure of partitions/covers delivered by other techniques. We have also implemented sequential algorithms combining OSLOM with other fast techniques, so that the community structure of very large networks can be uncovered. Our method has a comparable performance as the best existing algorithms on artificial benchmark graphs. Several applications on real networks are shown as well. OSLOM is implemented in a freely available software (http://www.oslom.org), and we believe it will be a valuable tool in the analysis of networks.
description: 24 pages, 25 figures, 1 table. Final version published in PLoS One. The code of OSLOM is freely available at http://www.oslom.org
Not all physical errors can be linear CPTP maps in a correlation space
Creators: name: Morimae, Tomoyuki
name: Fujii, Keisuke
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In the framework of quantum computational tensor network, which is a general framework of measurement-based quantum computation, the resource many-body state is represented in a tensor-network form, and universal quantum computation is performed in a virtual linear space, which is called a correlation space, where tensors live. Since any unitary operation, state preparation, and the projection measurement in the computational basis can be simulated in a correlation space, it is natural to expect that fault-tolerant quantum circuits can also be simulated in a correlation space. However, we point out that not all physical errors on physical qudits appear as linear completely-positive trace-preserving errors in a correlation space. Since the theories of fault-tolerant quantum circuits known so far assume such noises, this means that the simulation of fault-tolerant quantum circuits in a correlation space is not so straightforward for general resource states.
description: 5 pages
Seasonal variation of airborne particles characteristics and sources in Beijing during 2010-2011
Creators: name: Shen, R.R.
name: Schäfer, K.
name: Schnelle-Kreis, J.
name: Shao, L.
name: Norra, S.
name: Kramar, U.
name: Michalke, B.
name: Abbaszade, G.
name: Streibel, T.
name: Fricker, M.
name: Wang, Y.
name: Chen, Y.
name: Zimmermann, R.
name: Emeis, S.
name: Schmid, H.P.
Publisher: name: Karlsruhe
Year: 2015
Subjects: haze
seasonal variation
source apportionment
PMF
back trajectory cluster analyses

description: A lot of emission reduction measures to improve the air quality in Beijing were performed during the Olympic Summer Games in 2008, which has cut down coarse particles largely. But high air pollution has become more frequent (Du et al., 2014; Gao et al., 2014). In order to find out the long-term characteristics of airborne PM in different seasons, a continuous oneyear daily mean PM sampling from June 2010 till June 2011 was performed on the ground at the campus of the China University of Geosciences, Beijing (CUGB). To discriminate the composition of PM2.5 source attribution, particle characteristics and external impacts on the PM levels were investigated. Two sequential High-Volume operated to collect PM4 samples. The inorganic elements, inorganic water-soluble ions, EC and OC as well as Levoglucosan, eleven hopane substances and eleven PAHs of PM were analysed from PM samples by PEDXRF, ICP-MS, IC, thermal/optical carbon analyser and in situ derivatisation direct thermal desorption gas chromatography time-offlight mass spectrometry (IDTD-GC-TOFMS), respectively. Positive matrix factorization (version 3.0, U.S. EPA) on the basis of the chemical composition analyses and back trajectory cluster analyses were combined together to perform source apportionment. The results show that the main sources of particles during haze are different from season to season (Figure 1): secondary inorganic ions formation and biomass burning for summer and autumn haze, coal combustion for winter haze and mineral dust emissions for spring haze. Sources of PM during clear days were dominated by mineral dust emissions and traffic while haze was characterized by secondary inorganic ions formation during the whole year. High air pollution was found to be always accompanied by southerly air flows (industry and cities are about 100 km away), high relative humidity, low mixing layer height and low wind speed, i.e. stagnant weather conditions (Liu et al., 2014).
Observation of the Presuperfluid Regime in a Two-Dimensional Bose Gas
Creators: name: Tung, S.
name: Lamporesi, G.
name: Lobser, D.
name: Xia, L.
name: Cornell, E. A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: In complementary images of coordinate-space and momentum-space density in a trapped 2D Bose gas, we observe the emergence of pre-superfluid behavior. As phase-space density $ρ$ increases toward degenerate values, we observe a gradual divergence of the compressibility $κ$ from the value predicted by a bare-atom model, $κ_{ba}$. $κ/κ_{ba}$ grows to 1.7 before $ρ$ reaches the value for which we observe the sudden emergence of a spike at $p=0$ in momentum space. Momentum-space images are acquired by means of a 2D focusing technique. Our data represent the first observation of non-meanfield physics in the pre-superfluid but degenerate 2D Bose gas.
description: Replace with the version appeared in PRL
Clifford Gates by Code Deformation
Creators: name: Bombin, H.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Topological subsystem color codes add to the advantages of topological codes an important feature: error tracking only involves measuring 2-local operators in a two dimensional setting. Unfortunately, known methods to compute with them were highly unpractical. We give a mechanism to implement all Clifford gates by code deformation in a planar setting. In particular, we use twist braiding and express its effects in terms of certain colored Majorana operators.
description: Extended version with more details
Reflection $K$-matrices related to Temperley-Lieb $R$-matrices
Creators: name: Avan, Jean
name: Kulish, Petr P.
name: Rollet, Genevieve
Publisher: name: arXiv
Year: 2010
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Quantum Algebra (math.QA)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: The general solutions of the reflection equation associated with Temperley-Lieb $R$-matrices are constructed. Their parametrization is defined and the Hamiltonians of corresponding integrable spin systems are given.
description: 11 pages, no figures. References added and a few misprints corrected. To appear in Theoretical and Mathematical Physics (2011)
A Multiple Step-like Spectrum of Primordial Perturbation
Creators: name: Liu, Jie
name: Piao, Yun-Song
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We show that if the inflaton effective potential has multiple discontinuous points in its first derivative, the spectrum of primordial perturbation will be multiple step-like. We give a general analysis by applying a simple model. In principle, as long as the height of step is low enough, the result of spectrum will be consistent with observations.
description: minor changes and Refs. added, publish in PLB
Nonlocal van der Waals density functional: The simpler the better
Creators: name: Vydrov, Oleg A.
name: Van Voorhis, Troy
Publisher: name: arXiv
Year: 2010
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: We devise a nonlocal correlation energy functional that describes the entire range of dispersion interactions in a seamless fashion using only the electron density as input. The new functional is considerably simpler than its predecessors of a similar type. The functional has a tractable and robust analytic form that lends itself to efficient self-consistent implementation. When paired with an appropriate exchange functional, our nonlocal correlation model yields accurate interaction energies of weakly-bound complexes, not only near the energy minima but also far from equilibrium. Our model exhibits an outstanding precision at predicting equilibrium intermonomer separations in van der Waals complexes. It also gives accurate covalent bond lengths and atomization energies. Hence the functional proposed in this work is a computationally inexpensive electronic structure tool of broad applicability.
Electron-electron interaction and electron-hole asymmetry in bilayer graphene
Creators: name: Zou, K.
name: Hong, X.
name: Zhu, J.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We report precision measurements of the effective mass m* in high-quality bilayer graphene using the temperature dependence of the Shubnikov-de Haas oscillations. In the density range of 0.7 x 10^12/cm^2 < n < 4.1 x 10^12 /cm^2, both the hole mass m*_h and the electron mass m*_e increase with increasing density, demonstrating the hyperbolic nature of the bands. The hole mass m*_h is approximately 20-30% larger than the electron mass m*_e. Tight-binding calculations provide a good description of the electron-hole asymmetry and yield an accurate measure of the inter-layer hopping parameter v_4 = 0.063. Both m*_h and m*_e are substantially suppressed compared to single-particle values, providing clear and unprecedented evidence for the strong renormalization effect of electron-electron interaction in the band structure of bilayer graphene.
description: updated manuscript. Physical Review B in press
LHC Phenomenology of Lowest Massive Regge Recurrences in the Randall-Sundrum Orbifold
Creators: name: Anchordoqui, Luis A.
name: Goldberg, Haim
name: Huang, Xing
name: Taylor, Tomasz R.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider string realizations of the Randall-Sundrum effective theory for electroweak symmetry breaking and explore the search for the lowest massive Regge excitation of the gluon and of the extra (color singlet) gauge boson inherent of D-brane constructions. In these curved backgrounds, the higher-spin Regge recurrences of Standard Model fields localized near the IR brane are warped down to close to the TeV range and hence can be produced at collider experiments. Assuming that the theory is weakly coupled, we make use of four gauge boson amplitudes evaluated near the first Regge pole to determine the discovery potential of LHC. We study the inclusive dijet mass spectrum in the central rapidity region |y_{jet}| < 1.0 for dijet masses M \geq 2.5 TeV. We find that with an integrated luminosity of 100 fb^{-1}, the 5σdiscovery reach can be as high as 4.7 TeV. Observations of resonant structures in pp \rightarrow direct γ+ jet can provide interesting corroboration for string physics up to 3.0 TeV. We also study the ratio of dijet mass spectra at small and large scattering angles. We show that with the first fb^{-1} such a ratio can probe lowest-lying Regge states for masses \sim 2.5 TeV.
description: To be published in Physical Review D
Dirac fields in f(R)-gravity with torsion
Creators: name: Fabbri, Luca
name: Vignolo, Stefano
Publisher: name: arXiv
Year: 2010
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We study f(R)-gravity with torsion in presence of Dirac massive fields. Using the Bianchi identities, we formulate the conservation laws of the theory and we check the consistency with the matter field equations. Further, we decompose the field equations in torsionless and torsional terms: we show that the non-linearity of the gravitational Lagrangian reduces to the presence of a scalar field that depends on the spinor field; this additional scalar field gives rise to an effective stress-energy tensor and plays the role of a scale factor modifying the normalization of Dirac fields. Problems for fermions regarding the positivity of energy and the particle-antiparticle duality are discussed.
description: 14 pages
Ditau jets in Higgs searches
Creators: name: Englert, Christoph
name: Roy, Tuhin S.
name: Spannowsky, Michael
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Understanding and identifying ditau jets -- jets consisting of pairs of tau particles, can be of crucial importance and may even turn out to be a necessity if the Higgs boson decays dominantly to new light scalars which, on the other hand, decay to tau pairs. As often seen in various models of BSM such as in the NMSSM, Higgs portals etc., the lightness of these new states ensures their large transverse momenta and, as a consequence, the collinearity of their decay products. We show that the non-standard signatures of these objects, which can easily be missed by standard analysis techniques, can be superbly exploited in an analysis based on subjet observables. When combined with additional selection strategies, this analysis can even facilitate an early discovery of the Higgs boson. To be specific, a light Higgs can be found with $S/\sqrt{B} \gtrsim 5$ from $\mathcal {L} \simeq 12 fb^{-1}$ of data. We combine all these observables into a single discriminating likelihood that can be employed toward the construction of a realistic and standalone ditau tagger.
description: 9 pages, 9 figures. References added, typos corrected, published version
Optimal Phasor Measurement Unit Placement Using a Honey Bee Mating Optimization (HBMO) Technique Considering Measurement Loss and Line Outages
Creators: name: Dehghan Chaharabi, Ali
Publisher: name: figshare
Year: 2021
Subjects: subject: 150504 Marketing Measurement
subject: FOS: Economics and business
subject: 90104 Aircraft Performance and Flight Control Systems
subject: FOS: Mechanical engineering
subject: 90407 Process Control and Simulation
subject: FOS: Chemical engineering
subject: 90602 Control Systems, Robotics and Automation
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: 91304 Dynamics, Vibration and Vibration Control
subject: 91301 Acoustics and Noise Control (excl. Architectural Acoustics)

description: Phasor measurement units (PMUs) are important devices for protection, monitoring, and control of modern power systems. Unlike the supervisory control and data acquisition (SCADA) system which only measure the magnitude, PMUs can provide a set of synchronized phasor measurements with high sampling rate with the accuracy of less than one second, for better system monitoring especially during the outages. Since the PMUs are costly devices, system operator is not able to install a PMU at each bus to maximize the observability of system. To this end, determination of the number of PMUs in the system for having a 100% observability is pivotal. In this paper, honey bee mating optimization (HBMO) approach is utilized to allocate PMUs in modern power systems. Moreover, the impact of line outages, as well as measurement loses, are considered. The simulation results show the effectiveness of the proposed method on solving the PMU placement problem.
Demonstration of Deutsch's Algorithm on a Stable Linear-Optical Quantum Computer
Creators: name: Zhang, Pei
name: Liu, Rui-Feng
name: Huang, Yun-Feng
name: Gao, Hong
name: Li, Fu-Li
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We report an experimental demonstration of quantum Deutsch's algorithm by using linear-optical system. By employing photon's polarization and spatial modes, we implement all balanced and constant functions for quantum computer. The experimental system is very stable and the experimental data are excellent in accordance with the theoretical results.
description: 7 pages, 4 figures
Flexibilisierung der Haushaltsnachfrage durch ein Photovoltaik-Batteriespeichersystem und ein Elektrofahrzeug = Flexible household load by solar energy storage and EV
Creators: name: Kaschub, Thomas
name: Jochem, Patrick
name: Fichtner, Wolf
Publisher: name: Karlsruhe
Year: 2015

description: Die Flexibilität der elektrischen Haushaltsnachfrage wird sich mit Photovoltaik-Batterie-speichersystem (PV-Speicher) und Elektrofahrzeug deutlich steigern und kann den Verlauf der Stromnachfrage und die Erlöse für Versorger signifikant verändern. Mit einem techno-ökonom¬ischen Optimierungsmodell solcher Haushalte zeigen wir die Wirtschaftlichkeit dieser PV-Speicher-Systeme – in wenigen Jahren sogar ohne Förderung. Mit Demand Response Maßnahmen oder speziellen Tarifen lässt sich die flexible Nachfrage seitens des Energie-versorgers beeinflussen. Insbesondere gesteuertes Laden des Elektrofahrzeugs hat einen erheblichen Einfluss auf das Ergebnis.
The n-n-alpha System in a Continuum Faddeev Formulation
Creators: name: Khaldi, K.
name: Elster, Ch.
name: ~Glöckle, W.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The continuum Faddeev equations for the neutron-neutron-alpha (n-n-$α$) system are formulated for a general interaction as well as for finite rank forces. In addition, the capture process n+n+$α\rightarrow ^6$He+$γ$ is derived.
description: 20 pages, 1 figure version accepted for publication in Physical Review C
ESTABLISHMENT AND PLACEMENT OF A MULTI-PURPOSE PHASOR MEASUREMENT UNIT TO IMPROVE PARALLEL STATE ESTIMATION IN DISTRIBUTION NETWORKS
Creators: name: Dehghan Chaharabi, Ali
name: Khashroum, Zeyad
Publisher: name: figshare
Year: 2021
Subjects: subject: 100507 Optical Networks and Systems
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: 100503 Computer Communications Networks

description: Today, microgrids in distribution networks are in dire need of improvement to cope with economic challenges, human losses, and equipment placement issues. Today, there is the issue of scattered resources in distribution systems, which has created many problems in the areas of environment, economy, and human and animal losses. The most important challenge in this section is the existence of voltage and frequency fluctuations during the occurrence of possible events such as severe load changes or errors in distribution networks. Having such a big problem can call a distribution network into question and destroy it. Therefore, it is necessary to provide an optimal method that can meet and cover these challenges. For this purpose, the present research deals with the problem of establishing and placing a multifunctional phasor measurement unit to improve the parallel state estimation in distribution networks, which offers a control approach. This approach determines the time of occurrence of internal and external disturbances after using the phasor unit. The approach of this research is to use a neural-fuzzy method because there is uncertainty in the distribution network due to the mentioned challenges, and training in the system is needed to accurately deploy and place possible errors. Do not occur. When setting up and placing the phasor measuring unit, the most important issue is the proper distribution of the load in the distribution network. The simulation results in the MATLAB / Simulink environment show the improvement of the results according to the proposed approach.
Spin--3/2 to spin--1/2 heavy baryons and pseudoscalar mesons transitions in QCD
Creators: name: Aliev, T. M.
name: Azizi, K.
name: Savci, M.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The strong coupling constants of light pseudoscalar mesons with spin--3/2 and spin--1/2 heavy baryons are calculated in the framework of light cone QCD sum rules. It is shown that each class of transitions among members of the sextet spin--3/2 to sextet spin--1/2 baryons and that of the sextet spin--3/2 to spin--1/2 anti--triplet baryons is described by only one invariant function. We also estimate the widths of kinematically allowed transitions. Our results on decay widths are in good agreement with the existing experimental data, as well as predictions of other nonperturbative approaches.
description: 17 Pages, 4 Figures and 5 Tables
Axial anomalies of Lifshitz fermions
Creators: name: Bakas, Ioannis
name: Lust, Dieter
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We compute the axial anomaly of a Lifshitz fermion theory with anisotropic scaling z=3 which is minimally coupled to geometry in 3+1 space-time dimensions. We find that the result is identical to the relativistic case using path integral methods. An independent verification is provided by showing with spectral methods that the eta-invariant of the Dirac and Lifshitz fermion operators in three dimensions are equal. Thus, by the integrated form of the anomaly, the index of the Dirac operator still accounts for the possible breakdown of chiral symmetry in non-relativistic theories of gravity. We apply this framework to the recently constructed gravitational instanton backgrounds of Horava-Lifshitz theory and find that the index is non-zero provided that the space-time foliation admits leaves with harmonic spinors. Using Hitchin's construction of harmonic spinors on Berger spheres, we obtain explicit results for the index of the fermion operator on all such gravitational instanton backgrounds with SU(2)xU(1) isometry. In contrast to the instantons of Einstein gravity, chiral symmetry breaking becomes possible in the unimodular phase of Horava-Lifshitz theory arising at lambda = 1/3 provided that the volume of space is bounded from below by the ratio of the Ricci to Cotton tensor couplings raised to the third power. Some other aspects of the anomalies in non-relativistic quantum field theories are also discussed.
description: 114 pages, 6 figures; minor improvements made in v2 (version to appear in Fortschritte der Physik)
Bistability in the Chemical Master Equation for Dual Phosphorylation Cycles
Creators: name: Bazzani, A.
name: Castellani, G.
name: Giampieri, E.
name: Remondini, D.
name: Cooper, L. N
Publisher: name: arXiv
Year: 2011
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Chemical Physics (physics.chem-ph)
subject: Molecular Networks (q-bio.MN)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: Dual phospho/dephosphorylation cycles, as well as covalent enzymatic-catalyzed modifications of substrates, are widely diffused within cellular systems and are crucial for the control of complex responses such as learning, memory and cellular fate determination. Despite the large body of deterministic studies and the increasing work aimed to elucidate the effect of noise in such systems, some aspects remain unclear. Here we study the stationary distribution provided by the two-dimensional Chemical Master Equation for a well known model of a two step phospho/dephosphorylation cycle using the quasi steady state approximation of the enzymatic kinetics. Our aim is to analyze the role of fluctuations and the molecules distribution properties in the transition to a bistable regime. When detailed balance conditions are satisfied it is possible to compute equilibrium distributions in a closed and explicit form. When detailed balance is not satisfied, the stationary non-equilibrium state is strongly influenced by the chemical fluxes. In the last case, we show how the Helmholtz decomposition of the external field associated to the generation and recombination transition rates, into a conservative and a rotational (irreversible) part, allows to compute the stationary distribution via a perturbative approach . For a finite number of molecules, there exists diffusion dynamics in a macroscopic region of the state space, where a relevant transition rate between the two critical points is observed. Further, the stationary distribution function can be approximated by the solution of a Fokker-Planck equation. We illustrate the theoretical results using several numerical simulations.
On the low-temperature performances of THGEM and THGEM/G-APD multipliers in gaseous and two-phase Xe
Creators: name: Bondar, A.
name: Buzulutskov, A.
name: Grebenuk, A.
name: Shemyakina, E.
name: Sokolov, A.
name: Akimov, D.
name: Alexandrov, I.
name: Breskin, A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The performances of THGEM multipliers in two-phase Xe avalanche mode are presented for the first time. Additional results on THGEM operation in gaseous Xe at cryogenic temperatures are provided. Stable operation of a double-THGEM multiplier was demonstrated in two-phase Xe with gains reaching 600. These are compared to existing data, summarized here for two-phase Ar, Kr and Xe avalanche detectors incorporating GEM and THGEM multipliers. The optical readout of THGEMs with Geiger-mode Avalanche Photodiodes (G-APDs) has been investigated in gaseous Xe at cryogenic temperature; avalanche scintillations were recorded in the Near Infrared (NIR) at wavelengths of up to 950 nm. At avalanche charge gain of 350, the double-THGEM/G-APD multiplier yielded 0.07 photoelectrons per initial ionization electron, corresponding to an avalanche scintillation yield of 0.7 NIR photons per avalanche electron over 4pi. The results are compared with those of two-phase Ar avalanche detectors. The advantages, limitations and possible applications are discussed.
description: 22 pages, 14 figures. Revised Figs. 10,11 and Table 1. To be published in JINST
Continuous-time Monte Carlo methods for quantum impurity models
Creators: name: Gull, Emanuel
name: Millis, Andrew J.
name: Lichtenstein, Alexander I.
name: Rubtsov, Alexey N.
name: Troyer, Matthias
name: Werner, Philipp
Publisher: name: arXiv
Year: 2010
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Quantum impurity models describe an atom or molecule embedded in a host material with which it can exchange electrons. They are basic to nanoscience as representations of quantum dots and molecular conductors and play an increasingly important role in the theory of "correlated electron" materials as auxiliary problems whose solution gives the "dynamical mean field" approximation to the self energy and local correlation functions. These applications require a method of solution which provides access to both high and low energy scales and is effective for wide classes of physically realistic models. The continuous-time quantum Monte Carlo algorithms reviewed in this article meet this challenge. We present derivations and descriptions of the algorithms in enough detail to allow other workers to write their own implementations, discuss the strengths and weaknesses of the methods, summarize the problems to which the new methods have been successfully applied and outline prospects for future applications.
Development of luminescent conjugated polymers containing tri- and tetracoordinate organoboron
Creators: name: Alahmadi, Abdullah Faisal
Publisher: name: No Publisher Supplied
Year: 2023

description: The objective of this research is to develop new electron deficient building blocks based on organoboron compounds for conjugated polymers with potential utility in organic electronic applications such as OLED and organic solar cells. Development of n-type organic semiconductors lag its p-type counterpart due to difficult synthesis and manipulation of n-type building blocks. Boron atoms can be incorporated into conjugated materials in their tetracoordinate or tricoordinate form with more facile modification of electronic properties. Chapter 2 and 3 will discuss the synthesis of B-N Lewis pair-fused dipyridylfluorene monomers, which contain tetracoordinate boron atoms. For the derived polymers the effectiveness of π-conjugation and the influence of comonomers and boron substituents were studied. Chapter 4 focuses on the development of tricoordinate organoboron polymers based on bis(thienyl)borane with a bulky protection group. The optical and electronic properties of the monomers and polymers can be tuned by variation of the B-CThiophene attachment site and the pendant aryl substituent. An optimized polymerization procedure was developed to reduce or eliminate structural defects from homocoupling and alkyl transfer which can significantly impact the electronic properties of developed bis(thienyl)borane polymers. The developed bis(thienyl)boranes were evaluated for non-fullerene organic solar cells that can be casted from ecofriendly solvents such as alcohols and 2-methyl furane.
Euseius mesembrinus Dean 1957
Creators: name: Argolo, Poliane Sá
name: Vital Santos, Renata M.
name: Leão Bittencourt, Maria A.
name: Da Silva Noronha, Aloyséia C.
name: De Moraes, Gilberto J.
name: Oliveira, Anibal Ramadan
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Mesostigmata
Phytoseiidae
Euseius
Euseius mesembrinus

description: Euseius mesembrinus (Dean, 1957)
 Typhlodromus mesembrinus Dean, 1957: 165.
 Euseius mesembrinus.––Moraes et al., 2004: 74; Chant & McMurtry, 2007: 121. Euseius ho.–– Lopes et al., 2015: 180.
 Records in Bahia: Euseius ho.–– Moraes & McMurtry, 1983: 139; Moraes et al., 1993: 80.
description: Published as part of Argolo, Poliane Sá, Vital Santos, Renata M., Leão Bittencourt, Maria A., Da Silva Noronha, Aloyséia C., De Moraes, Gilberto J. & Oliveira, Anibal Ramadan, 2017, Phytoseiid mites (Acari: Phytoseiidae) associated with tropical ornamental plants, with a checklist and a key to the species of Bahia, Brazil, pp. 345-364 in Zootaxa 4258 (4) on page 351, DOI: 10.11646/zootaxa.4258.4.3, http://zenodo.org/record/570106
Topological Order and Semions in a Strongly Correlated Quantum Spin Hall Insulator
Creators: name: Rüegg, Andreas
name: Fiete, Gregory A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We provide a self-consistent mean-field framework to study the effect of strong interactions in a quantum spin Hall insulator on the honeycomb lattice. We identify an exotic phase for large spin-orbit coupling and intermediate Hubbard interaction. This phase is gapped in the bulk, has gapless edge states and does not break any symmetry. Instead, we find a four-fold topological degeneracy of the ground state on the torus and fractionalized excitations with semionic mutual braiding statistics. Our work highlights the important theme that interesting phases arise in the regime of strong spin-orbit coupling and interactions.
description: 5 pages, 4 figures, presentation improved, references added, experimental signature added
Ciccone, Lino, «Non uccidere». Questioni di morale delia vita física. Ed. ARES. 1 vol. de 400 ps., 210x150. Milano 1984
Creators: name: Marques, J. A.
Publisher: name: Theologica
Year: 2023

description: Theologica, v. 21 n. 1-4 (1986)
Charge separation instability in an unmagnetized disk plasma around a Kerr black hole
Creators: name: Koide, Shinji
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: In almost all of plasma theories for astrophysical objects, we have assumed the charge quasi-neutrality of unmagnetized plasmas in global scales. This assumption has been justified because if there is a charged plasma, it induces electric field which attracts the opposite charge, and this opposite charge reduces the charge separation. Here, we report a newly discovered instability which causes a charge separation in a rotating plasma inside of an innermost stable circular orbit (ISCO) around a black hole. The growth rate of the instability is smaller than that of the disk instability even in the unstable disk region and is forbidden in the stable disk region outside of the ISCO. However, this growth rate becomes comparable to that of the disk instability when the plasma density is much lower than a critical density inside of the ISCO. In such case, the charge separation instability would become apparent and cause the charged accretion into the black hole, thus charge the hole up.
description: 15pages, 1 figure