cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
On the nature of the absorber in IRAS 09104+4109: the X-ray and mid-infrared view
Creators: name: Vignali, C.
name: Piconcelli, E.
name: Lanzuisi, G.
name: Feltre, A.
name: Feruglio, C.
name: Maiolino, R.
name: Fiore, F.
name: Fritz, J.
name: La Parola, V.
name: Mignoli, M.
name: Pozzi, F.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present a long (~76 ks) Chandra observation of IRAS 09104+4109, a hyper-luminous galaxy, optically classified as a Type 2 AGN hosted in a cD galaxy in a cluster at z=0.442. We also report on the results obtained by fitting its broad-band spectral energy distribution. The Compton-thick nature of this source (which has been often referred to as an "archetype" of Compton-thick Type 2 quasars) was formerly claimed on the basis of its marginal detection in the PDS instrument onboard BeppoSAX, being then disputed using XMM-Newton data. Both Chandra analysis and optical/mid-IR spectral fitting are consistent with the presence of heavy (~1-5 10^{23} cm^{-2}) but not extreme (Compton-thick) obscuration. However, using the mid-IR and the [OIII] emission as proxies of the nuclear hard X-ray luminosity suggests the presence of heavier obscuration. The 54-month Swift BAT map shows excess hard X-ray emission likely related to a nearby (z=0.009) Type 2 AGN, close enough to IRAS 09104+4109 to significantly enhance and contaminate its emission in the early BeppoSAX PDS data.
description: 10 pages, 4 figures, 2 tables, MNRAS. Some references added
Extremal problems for the central projection
Creators: name: Sakata, Shigehiro
Publisher: name: arXiv
Year: 2011
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 51M16, 51M25

description: We consider a projection from the center of the unit sphere to a tangent space of it, the central projection, and study two area minimizing problems of the image of a closed subset in the sphere. One of the problems is the uniqueness of the tangent plane that minimizes the area for an arbitrary fixed subset. The other is the shape of the subset that minimizes the minimum value of the area. We also study the similar problems for the hyperbolic space.
description: 4 pages, 1 figure
Ordinal Compactness
Creators: name: Lipparini, Paolo
Publisher: name: arXiv
Year: 2010
Subjects: subject: General Topology (math.GN)
subject: FOS: Mathematics
subject: 54D20, 03E10, 54A05, 54D10

description: We introduce a new covering property, defined in terms of order types of sequences of open sets, rather than in terms of cardinalities of families. The most general form of this compactness notion depends on two ordinal parameters. In the particular case when the parameters are cardinal numbers, we get back a classical notion. Generalized to ordinal numbers, this notion turns out to behave in a much more varied way. We present many examples of spaces satisfying the very same cardinal compactness properties, but with a broad range of distinct behaviors, with respect to ordinal compactness. A much more refined theory is obtained for $T_1$ spaces, in comparison with arbitrary topological spaces. The notion of ordinal compactness becomes partly trivial for spaces of small cardinality.
description: v.2 Largely expanded and improved 46 pages
Search for flavor changing neutral currents via quark-gluon couplings in single top quark production using 2.3 fb^-1 of ppbar collisions
Creators: name: D0 Collaboration
name: Abazov, V.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We present a search for flavor changing neutral currents via quark-gluon couplings in a sample of single top quark final states corresponding to 2.3 fb^-1 of integrated luminosity collected with the D0 detector at the Fermilab Tevatron Collider. We select events containing a single top quark candidates with an additional jet, and obtain separation between signal and background using Bayesian neural networks. We find consistency between background expectation and observed data, and set limits on flavor changing neutral current gluon couplings of the top quark to up quarks (tgu) and charm quarks (tgc). The cross section limits at the 95% C.L. are sigma_tgu<0.20pb and sigma_tgc<0.27pb. These correspond to limits on the top quark decay branching fractions of B(t->gu)<2.0*10^-4 and B(t->gc)<3.9*10^-3.
description: published by Phys. Lett. B
Discrete holomorphic parafermions in the Ashkin-Teller model and SLE
Creators: name: Ikhlef, Y.
name: Rajabpour, M. A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We find discrete holomorphic parafermions of the Ashkin-Teller model on the critical line, by mapping appropriate interfaces of the model to the $O(n=1)$ model. We give support to the conjecture that the curve created by the insertion of parafermionic operators at two points on the boundary is $SLE(4,ρ,ρ)$, where $ρ$ varies along the critical line.
description: 13 pages, 12 figures
Memorandum from Charles Dollard to Frederick P. Keppel and Eliza Gaylord, May 25, 1940
Creators: name: Dollard, Charles, 1907-1977
Publisher: name: Columbia University
Year: 2019
Subjects: Race relations
African Americans--Social conditions
Endowments

description: Details of Charles Dollard's meeting with Samuel A. Stouffer to review the Carnegie-Myrdal Study budget.
Memorandum from Gunnar Myrdal to staff of Carnegie-Myrdal Study, May 9, 1940
Creators: name: Myrdal, Gunnar, 1898-1987
Publisher: name: Columbia University
Year: 2019
Subjects: Race relations
African Americans--Social conditions
Endowments

description: In advance of his departure for Sweden, Gunnar Myrdal addresses the team of the Carnegie-Myrdal Study, outlining his last meeting with Frederick P. Keppel to discuss the future of the study, and thanking the staff for their service.
The Effects of Tachyonic and Phantom Fields in the Intermediate and Logamediate Scenarios of the Anisotropic Universe
Creators: name: Chakraborty, Shuvendu
name: Debnath, Ujjal
Publisher: name: arXiv
Year: 2011
Subjects: subject: General Physics (physics.gen-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this work, we have analyzed two scenarios namely, "intermediate" and "logamadiate" scenarios for closed, open and flat anisotropic universe in presence of phantom field, normal tachyonic field and phantom tachyonic field. We have assumed that there is no interaction between the above mentioned dark energy and dark matter. In these two types of the scenarios of the universe, the nature of the scalar fields and corresponding potentials have been investigated. In intermediate scenario, (i) the potential for normal tachyonic field decreases, (ii) the potentials for phantom tachyonic field and phantom field increase with the corresponding fields. Also in logamediate scenario, (i) the potential for normal tachyonic field increases, (ii) the potentials for phantom tachyonic field and phantom field decrease with the corresponding fields.
description: 20 figures
Process dependent Sivers function and implications for single spin asymmetry in inclusive hadron production
Creators: name: Gamberg, Leonard
name: Kang, Zhong-Bo
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the single transverse spin asymmetries in the single inclusive particle production within the framework of the generalized parton model (GPM). By carefully analyzing the initial- and final-state interactions, we include the process-dependence of the Sivers functions into the GPM formalism. The modified GPM formalism has a close connection with the collinear twist-3 approach. Within the new formalism, we make predictions for inclusive $π^0$ and direct photon productions at RHIC energies. We find the predictions are opposite to those in the conventional GPM approach.
description: 12 pages, 5 figures, extended discussion on connection with twist three approach, references added
Exploring the myth- women-led small businesses have low growth aspirations!
Creators: name: Hynes, Briga
name: Costin, Yvonne
Publisher: name: University of Limerick
Year: 2023
Subjects: classificationCode: 3506
subject: Marketing
subject: FOS: Economics and business

description: This research examines the phenomenon of small firm growth as it applies to the established female owner-managed business to build on the lacuna of Irish empirical research on this topic. In particular, issues such as their perception of firm growth, the objectives and strategies for growth, and the challenges encountered in achieving firm growth are examined. The study concludes that female owner-managers have definite objectives for business growth which are achieved through a focus on product and market development. The challenges encountered in growing their business are in the majority of instances non-gender specific and relate to internal management issues.
Cosmological Daemon
Creators: name: Aref'eva, I. Ya.
name: Volovich, I. V.
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: Classical versions of the Big Bang cosmological models of the universe contain a singularity at the start of time, hence the time variable in the field equations should run over a half-line. Nonlocal string field theory equations with infinite number of derivatives are considered and an important difference between nonlocal operators on the whole real line and on a half-line is pointed out. We use the heat equation method and show that on the half-line in addition to the usual initial data a new arbitrary function (external source) occurs that we call the daemon function. The daemon function governs the evolution of the universe similar to Maxwell`s demon in thermodynamics. The universe and multiverse are open systems interacting with the daemon environment. In the simplest case the nonlocal scalar field reduces to the usual local scalar field coupled with an external source which is discussed in the stochastic approach to inflation. The daemon source can help to get the chaotic inflation scenario with a small scalar field.
description: LATEX, 31 pages, Sect. "Inflation and External Sources" and refs. are added
Is the common envelope ejection efficiency a function of the binary parameters?
Creators: name: Davis, P. J.
name: Kolb, U.
name: Knigge, C.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We reconstruct the common envelope (CE) phase for the current sample of observed white dwarf-main sequence post-common envelope binaries (PCEBs). We apply multi-regression analysis in order to investigate whether correlations exist between the CE ejection efficiencies, alpha_CE, inferred from the sample, and the binary parameters: white dwarf mass, secondary mass, orbital period at the point the CE commences, or the orbital period immediately after the CE phase. We do this with and without consideration for the internal energy of the progenitor primary giants' envelope. Our fits should pave the first steps towards an observationally motivated recipe for calculating alpha_CE using the binary parameters at the start of the CE phase, which will be useful for population synthesis calculations or models of compact binary evolution. If we do consider the internal energy of the giants' envelope, we find a statistically significant correlation between alpha_CE and the white dwarf mass. If we do not, a correlation is found between alpha_CE and the orbital period at the point the CE phase commences. Furthermore, if the internal energy of the progenitor primary envelope is taken into account, then the CE ejection efficiencies are within the canonical range 0=1.
description: Accepted for publication in MNRAS. Minor corrections made. 21 pages, 13 figures
Real-space renormalization group for the transverse-field Ising model in two and three dimensions
Creators: name: Miyazaki, Ryoji
name: Nishimori, Hidetoshi
name: Ortiz, Gerardo
Publisher: name: arXiv
Year: 2010
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The two- and three-dimensional transverse-field Ising models with ferromagnetic exchange interactions are analyzed by means of the real-space renormalization group method. The basic strategy is a generalization of a method developed for the one-dimensional case, which exploits the exact invariance of the model under renormalization and is known to give the exact values of the critical point and critical exponent $ν$. The resulting values of the critical exponent $ν$ in two and three dimensions are in good agreement with those for the classical Ising model in three and four dimensions. This is the first example in which a real-space renormalization group on (2+1)- and (3+1)-dimensional Bravais lattices yields accurate estimates of the critical exponents.
description: 14 pages, 5 figures, 4 tables
Memorandum from Frederick P. Keppel to staff of Carnegie-Myrdal Study, May 13, 1940
Creators: name: Keppel, Frederick P. (Frederick Paul), 1875-1943
Publisher: name: Columbia University
Year: 2019
Subjects: Race relations
African Americans--Social conditions
Endowments

description: Frederick P. Keppel addresses the departure of Gunnar Myrdal for Sweden, and outlines the future of the Carnegie-Myrdal Study under the direction of Samuel A. Stouffer and Richard Sterner.
Gender Imbalances at the Macro-Level: A Comparative Analysis of Partners' Legal and Policy Contexts
Creators: name: Solera, Cristina
name: Balzano, Angela
name: The MINDtheGEPs Consortium
Publisher: name: Zenodo
Year: 2023
Subjects: GEPs
Gender Equality Plans

description: To lay the foundation for gender equality plans (GEPs) in research organisations, MINDtheGEPs has gathered various types of data to understand and address the multiple intersecting barriers. The initial step involved analyzing the strengths and weaknesses of each national context. This report, initially shared as part of the project titled Gender Imbalances at the Macro-Level: A Comparative Analysis of Partners' Legal and Policy Contexts, assessed research and higher education legislation and policies (particularly in terms of recruitment, promotion, and access to research funds), the gender equality approaches adopted in each country to meet EU directives, as well as labour market and welfare policies (especially those supporting the "dual earner-dual carer" model, breaking away from the traditional "unconditional worker" assumption). 
The collected material provides an overview of the differences in national settings where our partner organisations and researchers operate. These settings shape a set of opportunities and constraints that are not gender-neutral and inevitably influence the actions and achievements of organisations and male and female researchers in their pursuit of more inclusive and innovative science in a "happier" equilibria with other spheres of their lives.
High-order perturbations of a spherical collapsing star
Creators: name: Brizuela, David
name: Martin-Garcia, Jose M.
name: Sperhake, Ulrich
name: Kokkotas, Kostas D.
Publisher: name: arXiv
Year: 2010
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: In Ref. [1, 2] a formalism to deal with high-order perturbations of a general spherical background was developed. In this article, we apply it to the particular case of a perfect fluid background. We have expressed the perturbations of the energy-momentum tensor at any order in terms of the perturbed fluid's pressure, density and velocity. In general, these expressions are not linear and have sources depending on lower order perturbations. For the second-order case we make the explicit decomposition of these sources in tensor spherical harmonics. Then, a general procedure is given to evolve the perturbative equations of motions of the perfect fluid for any value of the harmonic label. Finally, with the problem of a spherical collapsing star in mind, we discuss the high-order perturbative matching conditions across a timelike surface, in particular the surface separating the perfect fluid interior from the exterior vacuum.
description: 21 pages
Memorandum from Ernest A. Farintosh to Charles Dollard, May 6, 1940
Creators: name: Farintosh, Ernest A.
Publisher: name: Columbia University
Year: 2019
Subjects: Race relations
African Americans--Social conditions
Endowments

description: Memorandum regarding payments to Gunnar Myrdal for the months of May through August, 1940 following Myrdal's return to Sweden.
Relaxation time ansatz and shear and bulk viscosities of gluon matter
Creators: name: Khvorostukhin, A. S.
name: Toneev, V. D.
name: Voskresensky, D. N.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Shear and bulk viscosity-to-entropy density ratios are calculated for the pure gluon matter in a non-equilibrium mean-field quasiparticle approach within the relaxation time approximation. We study how different approximations used in the literature affect the results for the shear and bulk viscosities. Though the results for the shear viscosity turned out to be quite robust, all evaluations of the shear and bulk viscosities obtained in the framework of the relaxation time approximation can be considered only as rough estimations.
description: 9 pages, 3 figures
Memorandum from Charles Dollard to Frederick P. Keppel, May 20, 1940
Creators: name: Dollard, Charles, 1907-1977
Publisher: name: Columbia University
Year: 2019
Subjects: Race relations
African Americans--Social conditions
Endowments

description: Notes on Charles Dollard's meeting with Samuel A. Stouffer to discuss research on economic conditions for the Carnegie-Myrdal Study.
Low Energy Signatures of the TeV Scale See-Saw Mechanism
Creators: name: Ibarra, A.
name: Molinaro, E.
name: Petcov, S. T.
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: We study a type I see-saw scenario where the right-handed (RH) neutrinos, responsible for the light neutrino mass generation, lie at the electroweak scale. Under certain conditions, the strength of the charged and neutral current weak interactions of the Standard Model particles with the heavy RH neutrinos can be large enough to allow their production at the LHC, opening also the possibility of observing other low energy signatures of the new physics in the electroweak precision observables as well as in searches for rare leptonic decays or neutrinoless double beta decay. We argue that in this scenario the flavour structure of the neutrino Yukawa couplings is essentially determined by the low energy neutrino parameters, leading to fairly strong correlations among the new phenomena. In particular, we show that the present bound on the $μ\to e +γ$ decay rate makes very difficult the observation of the heavy RH neutrinos at the LHC or the observation of deviations from the Standard Model predictions in the electroweak precision data. We also argue that all present experimental constraints on this scenario still allow i) for an enhancement of the rate of neutrinoless double beta decay, which thus can be in the range of sensitivity of the GERDA experiment even when the light Majorana neutrinos possess a normal hierarchical mass spectrum, and ii) for the predicted $μ\to e+ γ$ decay rate to be within the sensitivity range of the MEG experiment.
description: Published version: 19 pages, 6 figures; references added; results unchanged
Letter from Gunnar Myrdal to Frederick P. Keppel, May 9, 1940
Creators: name: Myrdal, Gunnar, 1898-1987
Publisher: name: Columbia University
Year: 2019
Subjects: Race relations
African Americans--Social conditions
Endowments

description: Letter discussing Gunnar Myrdal's imminent departure for Sweden and the status of Doxey A. Wilkerson's research on education for the Carnegie-Myrdal Study.
Search for the Elusive Higgs Boson Using Jet Structure at LHC
Creators: name: Chen, Chuan-Ren
name: Nojiri, Mihoko M.
name: Sreethawong, Warintorn
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We consider the production of a light non-standard model Higgs boson of order $100~\GEV$ with an associated $W$ boson at CERN Large Hadron Collider. We focus on an interesting scenario that, the Higgs boson decays predominately into two light scalars $χ$ with mass of few GeV which sequently decay into four gluons, i.e. $h\to 2χ\to 4g$. Since $χ$ is much lighter than the Higgs boson, it will be highly boosted and its decay products, the two gluons, will move close to each other, resulting in a single jet for $χ$ decay in the detector. By using electromagnetic calorimeter-based and jet substructure analyses, we show in two cases of different $χ$ masses that it is quite promising to extract the signal of Higgs boson out of large QCD background.
description: 20 pages, 7 figures
Impression formation of investors december23
Creators: name: Erlandsson, Arvid
Publisher: name: OSF Registries
Year: 2023
Subjects: subject: Social and Behavioral Sciences
subject: Psychology
subject: FOS: Psychology

description: This study investigates how people form impressions of others based on how they invest their money. Participants read ostensibly real hand-written responses made by investors about their preferences when creating their investment portfolios. This is an initial study that is in part exploratory but in part has directed hypotheses.
Teleportation of squeezing: Optimization using non-Gaussian resources
Creators: name: Dell'Anno, F.
name: De Siena, S.
name: Adesso, G.
name: Illuminati, F.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: Other Condensed Matter (cond-mat.other)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We study the continuous-variable quantum teleportation of states, statistical moments of observables, and scale parameters such as squeezing. We investigate the problem both in ideal and imperfect Vaidman-Braunstein-Kimble protocol setups. We show how the teleportation fidelity is maximized and the difference between output and input variances is minimized by using suitably optimized entangled resources. Specifically, we consider the teleportation of coherent squeezed states, exploiting squeezed Bell states as entangled resources. This class of non-Gaussian states includes photon-added and photon-subtracted squeezed states as special cases. At variance with the case of entangled Gaussian resources, the use of entangled non-Gaussian squeezed Bell resources allows for different optimization procedures that lead to inequivalent results. Performing two independent optimization procedures one can either maximize the state teleportation fidelity, or minimize the difference between input and output quadrature variances. The two different procedures are compared depending on the degrees of displacement and squeezing of the input states and on the working conditions in ideal and non-ideal setups.
description: 10 pages, 3 figures, 1 table
Letter from Gunnar Myrdal April 29, 1940
Creators: name: Myrdal, Gunnar, 1898-1987
Publisher: name: Columbia University
Year: 2019
Subjects: Race relations
African Americans--Social conditions
Endowments

description: Gunnar Myrdal writes to Will Winton Alexander prior to his return to Sweden to bid Alexander farewell and thank him for his friendship.
Localized endomorphisms in Kitaev's toric code on the plane
Creators: name: Naaijkens, Pieter
Publisher: name: arXiv
Year: 2010
Subjects: subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences
subject: 81T05 (Primary) 81T25, 18D10 (Secondary)

description: We consider various aspects of Kitaev's toric code model on a plane in the C^*-algebraic approach to quantum spin systems on a lattice. In particular, we show that elementary excitations of the ground state can be described by localized endomorphisms of the observable algebra. The structure of these endomorphisms is analyzed in the spirit of the Doplicher-Haag-Roberts program (specifically, through its generalization to infinite regions as considered by Buchholz and Fredenhagen). Most notably, the statistics of excitations can be calculated in this way. The excitations can equivalently be described by the representation theory of D(Z_2), i.e., Drinfel'd's quantum double of the group algebra of Z_2.
description: 26 pages, 5 figures. v2: proof of Prop. 2.2 fixed, other minor corrections
Archimedes' law and its corrections for an active particle in a granular sea
Creators: name: Maes, Christian
name: Thomas, Simi R.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mathematical Physics (math-ph)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the origin of buoyancy forces acting on a larger particle moving in a granular medium subject to horizontal shaking and its corrections before fluidization. In the fluid limit Archimedes' law is verified; before the limit memory effects counteract buoyancy, as also found experimentally. The origin of the friction is an excluded volume effect between active particles, which we study more exactly for a random walker in a random environment. The same excluded volume effect is also responsible for the mutual attraction between bodies moving in the granular medium. Our theoretical modeling proceeds via an asymmetric exclusion process, i.e., via a dissipative lattice gas dynamics simulating the position degrees of freedom of a low density granular sea.
description: 22 pages,5 figures
Simulating rare events in dynamical processes
Creators: name: Giardina, Cristian
name: Kurchan, Jorge
name: Lecomte, Vivien
name: Tailleur, Julien
Publisher: name: arXiv
Year: 2011
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: Probability (math.PR)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: Atypical, rare trajectories of dynamical systems are important: they are often the paths for chemical reactions, the haven of (relative) stability of planetary systems, the rogue waves that are detected in oil platforms, the structures that are responsible for intermittency in a turbulent liquid, the active regions that allow a supercooled liquid to flow... Simulating them in an efficient, accelerated way, is in fact quite simple. In this paper we review a computational technique to study such rare events in both stochastic and Hamiltonian systems. The method is based on the evolution of a family of copies of the system which are replicated or killed in such a way as to favor the realization of the atypical trajectories. We illustrate this with various examples.
Memorandum from Samuel A. Stouffer and Richard Sterner to Gunnar Myrdal, May 6, 1940
Creators: name: Stouffer, Samuel A., 1900-1960
name: Sterner, Richard, 1901-1978
Publisher: name: Columbia University
Year: 2019
Subjects: Race relations
African Americans--Social conditions
Endowments

description: Memorandum discussing the budget and time schedule of Doxey A. Wilkerson's research on education for the Carnegie-Myrdal Study.
Togoperla canilimbata
Creators: name: Li, Wenliang
name: Wang, Yingying
name: Li, Weihai
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Plecoptera
Perlidae
Togoperla
Togoperla canilimbata

description: Togoperla canilimbata (Enderlein, 1909) (Fig. 3) Material examined. 2 males (HIST), China: Guangxi Zhuang Autonomous Region, Nanning City, Neichao village, N 23°29.533’, E 108°21.483’, 194 m, 2020. V.20, Raorao Mo, Yan Lai & Yingying Mo; 1 male (HIST), Guangxi Zhuang Autonomous Region, Fangcheng, Jinhuacha Nature Reserve, light trap, N 21°76.09’, E 108°43.49’, 2012. IV.16, Guoquan Wang; 1 male (CAUC), Hubei Province, Yingshan County, Caopan Town, Dabie Mountains, Taohuachong Forest Park, light trap, N 30°57.606’, E 115°45.426’, 634 m, 2014. VI.25; 1 male (CAUC), Guizhou Province, Tongren City, Fanjing Mountain, Yu’ao, scenic spot, 1400 m, 2006.VII.19, Gang Yao. Remarks. The primary dark interocellar area with truncate anterior margin is consistent and the presence/absence of two triangular marking forward and posterior to M-line could be explained as related to degree of aging of specimens (Figs. 3A, 3B & 3D). The armatures of aedeagal sac and three apical lobe agree well with Stark & Sivec (2008) and may serve as good characters for identification of this species (Figs. 3C & 3E).
description: Published as part of Li, Wenliang, Wang, Yingying & Li, Weihai, 2021, Additions to the genus Togoperla (Plecoptera: Perlidae) from China, pp. 102-110 in Zootaxa 5040 (1) on pages 105-106, DOI: 10.11646/zootaxa.5040.1.5, http://zenodo.org/record/5531046
description: {"references": ["Stark, B. P. & Sivec, I. (2008) The genus Togoperla Klapalek (Plecoptera: Perlidae). Illiesia, 4, 208 - 225."]}
Detecting monopoles on the lattice
Creators: name: Bonati, Claudio
name: Di Giacomo, Adriano
name: D'Elia, Massimo
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We address the issue why the number and the location of magnetic monopoles detected on lattice configurations are gauge dependent, in contrast with the physical expectation that monopoles have a gauge invariant status. By use of the Non-Abelian Bianchi Identities we show that monopoles are gauge invariant, but the efficiency of the technique usually adopted to detect them depends on the choice of the gauge in a well understood way. In particular we have studied a class of gauges which interpolates between the Maximal Abelian gauge, where all monopoles are observed, and the Landau gauge, where all monopoles escape detection.
description: 5 pages, 1 ps figure
Modification of black-body radiance at low temperatures and frequencies
Creators: name: Falquez, Carlos
name: Hofmann, Ralf
name: Baumbach, Tilo
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In contrast to earlier reports, where the spectrum of the {\sl energy density} of photonic black-body radiation modified by SU(2) effects was discussed, we discuss the low-frequency spectrum of the {\sl radiance} at temperatures ranging between 5 and 20 Kelvin. We conclude that compared to the conventional theory the only observable effect is associated with the spectral gap (total screening). We also discuss how a low-temperature black body cavity under the influence of a sufficiently strong static electric field is forced to emit according to Planck's radiation law (pure U(1) theory) even at low frequencies and how this effect can be utilized to measure SU(2) induced deviations.
description: 10 pp, 5 figs; v2: slight changes in text, extended discussion of Rydberg-atom experiment
New observations in the BRST analysis of dynamical non-Abelian 2-form gauge theory
Creators: name: Kumar, R.
name: Malik, R. P.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We generalize the usual gauge transformations connected with the 1-form gauge potential to the Becchi-Rouet-Stora-Tyutin (BRST) and anti-BRST symmetry transformations for the four (3+1)-dimensional (4D) topologically massive non-Abelian gauge theory that incorporates the famous (B\wedge F) term where there is an explicit topological coupling between 1-form and 2-form gauge fields. A novel feature of our present investigation is the observation that the (anti-)BRST symmetry transformations for the auxiliary 1-form field (K_μ) and 2-form gauge potential (B_{0i}) are not generated by the (anti-)BRST charges that are derived by exploiting all the relevant (anti-)BRST symmetry transformations corresponding to all the fields of the present theory. This observation is a new result because it is drastically different from the application of the BRST formalism to (non-)Abelian 1-form and Abelian 2-form as well as 3-form gauge theories.
description: LaTeX file, 11 pages, journal-version
Letter from Frederick P. Keppel to Edwin G. Nourse, May 20, 1940
Creators: name: Keppel, Frederick P. (Frederick Paul), 1875-1943
Publisher: name: Columbia University
Year: 2019
Subjects: Race relations
African Americans--Social conditions
Endowments

description: Frederick P. Keppel writes to Edwin G. Nourse to request the assistance of Nourse and his colleagues at the Brookings Institution in advising the Carnegie-Myrdal Study on the effects of recent social legislation.
Dark Matter Cores and Cusps: The Case of Multiple Stellar Populations in Dwarf Spheroidals
Creators: name: Amorisco, N. C.
name: Evans, N. W.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: A number of dwarf spheroidal (dSph) galaxies are known to contain a more extended, metal-poor population with a flattish velocity dispersion profile, and a more concentrated, metal-rich population with a velocity dispersion declining with radius. The two populations can be modelled with Michie-King distribution functions (DFs) in the isothermal and in the sharply truncated limits, respectively. We argue that the truncation of the metal-rich population can be traced back to the spatial distribution of the star forming gas. Suppose D is the exponent of the first non-constant term in the Taylor expansion of the total potential at the center (D=1 for NFW halos, D=2 for cored halos). Then, we show that the ratio of the half-light radii of the populations raised to the D/2 power must be smaller than the ratio of the line-of-sight velocity dispersions. Specialising to the case of the Sculptor dSph, we develop a technique to fit simultaneously both populations with Michie-King DFs. This enables us to determine the mass profile of the Sculptor dSph with unprecedented accuracy in the radial range between 0.2 and 1.2 kpc. We show that cored halo models are preferred over cusped halo models, with a likelihood ratio test rejecting NFW models at any significance level higher than 0.05%. Even more worryingly, the best-fit NFW models require concentrations with c<20, which is not in the cosmologically preferred range for dwarf galaxies. We conclude that the kinematics of multiple populations in dSphs provides a substantial new challenge for theories of galaxy formation, with the weight of available evidence strongly against dark matter cusps at the centre.
description: MNRAS, accepted, 14 pages, 11 figures
Memorandum from Charles Dollard to Frederick P. Keppel, April 29, 1940
Creators: name: Dollard, Charles, 1907-1977
Publisher: name: Columbia University
Year: 2019
Subjects: Race relations
African Americans--Social conditions
Endowments

description: Discussion of Charles Dollard's meetings during a trip to Washington and Gunnar Myrdal's return to Sweden in the wake of the Nazi invasion of Norway.
Memorandum from Charles Dollard to Eliza Gaylord, April 30, 1940
Creators: name: Dollard, Charles, 1907-1977
Publisher: name: Columbia University
Year: 2019
Subjects: Race relations
African Americans--Social conditions
Endowments

description: Memorandum regarding telephone conversation between Charles Dollard and Frederick P. Keppel discussing Gunnar Myrdal's salary in the months following his departure for Sweden.
The Many Worlds of Hugh Everett III
Creators: name: Kent, Adrian
Publisher: name: arXiv
Year: 2011
Subjects: subject: History and Philosophy of Physics (physics.hist-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A review of Peter Byrne's biography of Hugh Everett III, "The Many Worlds of Hugh Everett III: Multiple Universes, Mutual Assured Destruction, and the Meltdown of a Nuclear Family", (Oxford University Press, 2010).
description: Small typo corrections
Constraints on Decaying Dark Matter from Fermi Observations of Nearby Galaxies and Clusters
Creators: name: Dugger, Leanna
name: Jeltema, Tesla E.
name: Profumo, Stefano
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We analyze the impact of Fermi gamma-ray observations (primarily non-detections) of selected nearby galaxies, including dwarf spheroidals, and of clusters of galaxies on decaying dark matter models. We show that the fact that galaxy clusters do not shine in gamma rays puts the most stringent limits available to-date on the lifetime of dark matter particles for a wide range of particle masses and decay final states. In particular, our results put strong constraints on the possibility of ascribing to decaying dark matter both the increasing positron fraction reported by PAMELA and the high-energy feature in the electron-positron spectrum measured by Fermi. Observations of nearby dwarf galaxies and of the Andromeda Galaxy (M31) do not provide as strong limits as those from galaxy clusters, while still improving on previous constraints in some cases.
description: 27 pages, 5 figures, submitted to JCAP, revised version with some additions and corrections
Influence of the $A$ cation on the low-temperature antiferromagnetism of ordered antiferroelectric $A_2$CoTeO$_6$ perovskites
Creators: name: Mathieu, R.
name: Ivanov, S. A.
name: Tellgren, R.
name: Nordblad, P.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We have investigated the structural and magnetic properties of antiferroelectric $A_2$CoTeO$_6$ perovskites with $A$ = Cd, Ca, Sr, Pb, and Ba. All compounds are antiferromagnetic at low temperatures, with the antiferromagnetic transition temperature slightly decreasing with decreasing ionic size of the $A$ cation. Such a decrease in antiferromagnetic interaction is not observed in $A^{2+}_2$Co$M^{6+}$O$_6$ materials with other $M^{6+}$ cations of similar ionic sizes, suggesting that Te$^{6+}$ cations affect the electronic and in turn the magnetic structure of the system.
description: REVTeX style; 6 pages, 8 figures
Memorandum from Frederick P. Keppel to Robert M. Lester and Charles Dollard, April 29, 1940
Creators: name: Keppel, Frederick P. (Frederick Paul), 1875-1943
Publisher: name: Columbia University
Year: 2019
Subjects: Race relations
African Americans--Social conditions
Endowments

description: Discussion of Samuel A. Stouffer's interim direction of the Carnegie-Myrdal Study following Gunnar Myrdal's return to Sweden.
Exploring the effects of student choice of topic on reading fluency interventions
Creators: name: Cheng, Michèle Pellan
Publisher: name: University of British Columbia
Year: 2017

description: Intrinsic motivation to read and reading difficulties reciprocally interact—students who have difficulties in reading are often less motivated to read, resulting in reading disengagement and even greater reading difficulties. However, by increasing a student’s reading motivation, deep practice in reading also increases, resulting in improved reading outcomes. A way to improve student motivation is by incorporating student autonomy (through choice) in an intervention. The purpose of the study was to examine the effectiveness of a reading fluency intervention that incorporates student choice of topic through a multiple baseline across students design. Results indicated improvements in student reading fluency, both with the instructional passages and the generalization passages. Results from this study provide support for reading interventions that include choice of topic, even though students may choose passages or topics that are above their current reading levels.
Letter from Gunnar Myrdal to Frederick P. Keppel, May 3, 1940
Creators: name: Myrdal, Gunnar, 1898-1987
Publisher: name: Columbia University
Year: 2019
Subjects: Race relations
African Americans--Social conditions
Endowments

description: Letter discussing Frederick P. Keppel's offer to pay Gunnar Myrdal up to September 1 following Myrdal's May 7 departure from the Carnegie-Myrdal Study to return to Sweden.
Negative parity baryons in the $1/N_c$ expansion: the quark excitation versus the meson-nucleon resonance picture
Creators: name: Matagne, N.
name: Stancu, Fl.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In order to better understand the fundamental issue regarding the compatibility between the quark-shell picture and that of resonances in meson-nucleon scattering in large $N_c$ QCD we extend the work of Cohen and Lebed on mixed symmetric $\ell $ = 1 baryons to analyze excited states with $\ell $ = 3. We give an explicit proof on the degeneracy of mass eigenvalues of a simple Hamiltonian including operators up to order $\mathcal{O}(N^0_c)$ \emph{i. e.} neglecting $1/N_c$ corrections in the quark-shell picture in the large $N_c$ limit. We obtain three degenerate multiplets formed of $\ell = 3$ states, as in the case of $\ell $ = 1 baryons. The compatibility between this picture and that of resonances in meson-nucleon scattering is discussed in the light of the present results.
description: 18 pages, 4 tables. Published version. Note that Eqs. A1, A3 and A4 contain SO(3) Clebsch-Gordan coefficients, not Wigner 3j coefficients
Shear banding and flow-concentration coupling in colloidal glasses
Creators: name: Besseling, R.
name: Isa, L.
name: Ballesta, P.
name: Petekidis, G.
name: Cates, M. E.
name: Poon, W. C. K.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report experiments on hard sphere colloidal glasses that reveal a type of shear banding hitherto unobserved in soft glasses. We present a scenario that relates this to an instability arising from shear-concentration coupling, a mechanism previously thought unimportant in this class of materials. Below a characteristic shear rate $\dotγ_c$ we observe increasingly non-linear velocity profiles and strongly localized flows. We attribute this trend to very slight concentration gradients (likely to evade direct detection) arising in the unstable flow regime. A simple model accounts for both the observed increase of $\dotγ_c$ with concentration, and the fluctuations observed in the flow.
description: 4 pages, 4 figures, accepted for publication in Phys. Rev. Lett
Letter from Frederick P. Keppel to Guy Benton Johnson, April 30, 1940
Creators: name: Keppel, Frederick P. (Frederick Paul), 1875-1943
Publisher: name: Columbia University
Year: 2019
Subjects: Race relations
African Americans--Social conditions
Endowments

description: Letter regarding Gunnar Myrdal's departure for Sweden and details on Samuel A. Stouffer and Richard Sterner taking over direction of the Carnegie-Myrdal Study in his stead.
Anyonic entanglement renormalization
Creators: name: Koenig, Robert
name: Bilgin, Ersen
Publisher: name: arXiv
Year: 2010
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We introduce a family of variational ansatz states for chains of anyons which optimally exploits the structure of the anyonic Hilbert space. This ansatz is the natural analog of the multi-scale entanglement renormalization ansatz for spin chains. In particular, it has the same interpretation as a coarse-graining procedure and is expected to accurately describe critical systems with algebraically decaying correlations. We numerically investigate the validity of this ansatz using the anyonic golden chain and its relatives as a testbed. This demonstrates the power of entanglement renormalization in a setting with non-abelian exchange statistics, extending previous work on qudits, bosons and fermions in two dimensions.
description: 19 pages, 10 figures, v2: extended, updated to match published version
Letter from Charles Dollard to Frederick P. Keppel, April 24, 1940
Creators: name: Dollard, Charles, 1907-1977
Publisher: name: Columbia University
Year: 2019
Subjects: Race relations
African Americans--Social conditions
Endowments

description: Discussion of the establishment of an executive committee to operate Carnegie-Myrdal Study after Gunnar Myrdal's departure for Sweden.
Transport across nanogaps using semiclassically consistent boundary conditions
Creators: name: Biswas, Debabrata
name: Baraila, Pradeep
name: Kumar, Raghwendra
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Plasma Physics (physics.plasm-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Charge particle transport across nanogaps is studied theoretically within the Schrodinger-Poisson mean field framework and the existence of limiting current investigated. It is shown that the choice of a first order WKB wavefunction as the transmitted wave leads to self consistent boundary conditions and gives results that are significantly different in the non-classical regime from those obtained using a plane transmitted wave. At zero injection energies, the quantum limiting current density, J_c, is found to obey the local scaling law J_c ~ (V_g)^alpha/(D)^{5-2alpha} with the gap separation D and voltage V_g. The exponent alpha > 1.1 with alpha --> 3/2 in the classical regime of small de Broglie wavelengths. These results are consistent with recent experiments using nanogaps most of which are found to be in a parameter regime where classical space charge limited scaling holds away from the emission dominated regime.
description: 4 pages, 4 ps figures
Noise-induced dynamical transition in systems with symmetric absorbing states
Creators: name: Russell, D. I.
name: Blythe, R. A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We investigate the effect of noise strength on the macroscopic ordering dynamics of systems with symmetric absorbing states. Using an explicit stochastic microscopic model, we present evidence for a phase transition in the coarsening dynamics, from an Ising-like to a voter-like behavior, as the noise strength is increased past a nontrivial critical value. By mapping to a thermal diffusion process, we argue that the transition arises due to locally-absorbing states being entered more readily in the high-noise regime, which in turn prevents surface tension from driving the ordering process.
description: v2 with improved introduction and figures, to appear in PRL. 4 pages, 4 figures