cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Radial Transport and Meridional Circulation in Accretion Disks
Creators: name: Philippov, Alexander A.
name: Rafikov, Roman R.
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Radial transport of particles, elements and fluid driven by internal stresses in three-dimensional (3D) astrophysical accretion disks is an important phenomenon, potentially relevant for the outward dust transport in protoplanetary disks, origin of the refractory particles in comets, isotopic equilibration in the Earth-Moon system, etc. To gain better insight into these processes, we explore the dependence of meridional circulation in 3D disks with shear viscosity on their thermal stratification, and demonstrate strong effect of the latter on the radial flow. Previous locally isothermal studies have normally found a pattern of the radial outflow near the midplane, switching to inflow higher up. Here we show, both analytically and numerically, that a flow, which is inward at all altitudes, is possible in disks with entropy and temperature steeply increasing with height. Such thermodynamic conditions may be typical in the optically thin, viscously heated accretion disks. Disks in which these conditions do not hold should feature radial outflow near the midplane, as long as their internal stress is provided by the shear viscosity. Our results can also be used for designing hydrodynamical disk simulations with a prescribed pattern of the meridional circulation.
description: 11 pages, 5 figures, under review in ApJ, revised version after the referee report
Dark photon relic dark matter production through the dark axion portal
Creators: name: Kaneta, Kunio
name: Lee, Hye-Sung
name: Yun, Seokhoon
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present a new mechanism to produce the dark photon ($γ'$) in the early universe with a help of the axion ($a$) using a recently proposed dark axion portal. The dark photon, a light gauge boson in the dark sector, can be a relic dark matter if its lifetime is long enough. The main process we consider is a variant of the Primakoff process $f a \to f γ'$ mediated by a photon, which is possible with the axion--photon--dark photon coupling. The axion is thermalized in the early universe because of the strong interaction and it can contribute to the non-thermal dark photon production through the dark axion portal coupling. It provides a two-component dark matter sector, and the relic density deficit issue of the axion dark matter can be addressed by the compensation with the dark photon. The dark photon dark matter can also address the reported 3.5 keV $X$-ray excess via the $γ' \to γa$ decay.
description: 10 pages, 8 figures, Version accepted by PRD
Bell violation in primordial cosmology
Creators: name: Choudhury, Sayantan
name: Panda, Sudhakar
name: Singh, Rajeev
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this paper, we have worked on the possibility of setting up an Bell's inequality violating experiment in the context of primordial cosmology following the fundamental principles of quantum mechanics. To set up this proposal we have introduced a model independent theoretical framework using which we have studied the creation of new massive particles for the scalar fluctuations in the presence of additional time dependent mass parameter. Next we explicitly computed the one point and two point correlation functions from this setup. Then we comment on the measurement techniques of isospin breaking interactions of newly introduced massive particles and its further prospects. After that, we give an example of string theory originated axion monodromy model in this context. Finally, we provide a bound on the heavy particle mass parameter for any arbitrary spin field.
description: 10 pages, 6 figures, 1 table, Shorter version of arXiv:1607.00237, "Talk presented at Varying Constants and Fundamental Cosmology-VARCOSMOFUN'16. To appear in a special issue of Universe."
Solid State Thermionic Power Generators: an analytical analysis in the nonlinear regime
Creators: name: Zebarjadi, Mona
Publisher: name: arXiv
Year: 2017
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: Solid-state thermionic power generators are an alternative to thermoelectric modules. In this manuscript, we develop an analytical model to investigate the performance of these generators in the non-linear regime. We identify dimensionless parameters determining their performance and provide measures to estimate acceptable range of thermal and electrical resistances of thermionic generators. We find the relation between the optimum load resistance and the internal resistance and suggest guide lines for the design of thermionic power generators. Finally, we show that in the nonlinear regime, thermionic power generators can have efficiency values higher than the state of the art thermoelectric modules.
Supernova Driving. IV. The Star Formation Rate of Molecular Clouds
Creators: name: Padoan, Paolo
name: Haugbølle, Troels
name: Nordlund, Åke
name: Frimann, Søren
Publisher: name: arXiv
Year: 2017
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We compute the star formation rate (SFR) in molecular clouds (MCs) that originate {\it ab initio} in a new, higher-resolution simulation of supernova-driven turbulence. Because of the large number of well-resolved clouds with self-consistent boundary and initial conditions, we obtain a large range of cloud physical parameters with realistic statistical distributions, an unprecedented sample of star-forming regions to test SFR models and to interpret observational surveys. We confirm the dependence of the SFR per free-fall time, $SFR_{\rm ff}$, on the virial parameter, $α_{\rm vir}$, found in previous simulations, and compare a revised version of our turbulent fragmentation model with the numerical results. The dependences on Mach number, ${\cal M}$, gas to magnetic pressure ratio, $β$, and compressive to solenoidal power ratio, $χ$ at fixed $α_{\rm vir}$ are not well constrained, because of random scatter due to time and cloud-to-cloud variations in $SFR_{\rm ff}$. We find that $SFR_{\rm ff}$ in MCs can take any value in the range $0 \le SFR_{\rm ff} \lesssim 0.2$, and its probability distribution peaks at a value $SFR_{\rm ff}\approx 0.025$, consistent with observations. The values of $SFR_{\rm ff}$ and the scatter in the $SFR_{\rm ff}$--$α_{\rm vir}$ relation are consistent with recent measurements in nearby MCs and in clouds near the Galactic center. Although not explicitly modeled by the theory, the scatter is consistent with the physical assumptions of our revised model and may also result in part from a lack of statistical equilibrium of the turbulence, due to the transient nature of MCs.
description: ApJ, in press
Momificación artificial en el Pacífico Sur, ¿paralelismo o difusión?
Creators: name: Bittmann, Bente
name: Munizaga, Juan R.
Publisher: name: INDIANA
Year: 1980

description: Se describe y compara la momificación artificial que se practicaba en épocas históricas en Melanesia y aquella que aparece en épocas precolombinas en América (Cultura Chinchorro, Chile), las que presentan grandes similitudes a pesar de estar separadas por más de 10.000kmsen el espacio y 5000 años en el tiempo. De acuerdo con el conocimiento actual que se tiene acerca del desarrollo cultural en ambas regiones y con la ausencia de este tipo de momificación en otras áreas, se estima éste como un caso de paralelismo cultural.
description: INDIANA, Bd. 6 (1980)
Nuclear Weak Rates and Detailed Balance in Stellar Conditions
Creators: name: Misch, G. Wendell
Publisher: name: arXiv
Year: 2016
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Detailed balance is often invoked in discussions of nuclear weak transitions in astrophysical environments. Satisfaction of detailed balance is rightly touted as a virtue of some methods of computing nuclear transition strengths, but we argue that it need not necessarily be strictly obeyed, especially when the system is far from weak equilibrium. We present the results of shell model calculations of nuclear weak strengths in both charged current and neutral current channels at astrophysical temperatures. Using these strengths to compute some reaction rates, we find that, despite some violation of detailed balance, our method is robust up to high temperature, and we comment on the relationship between detailed balance and weak equilibrium in astrophysical conditions.
description: 10 pages, 11 figures
A review for compact model of graphene field-effect transistors
Creators: name: Lu, Nianduan
name: Wang, Lingfei
name: Li, Ling
name: Liu, Ming
Publisher: name: arXiv
Year: 2017
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences
subject: F.2.2; I.2.7
subject: 65Zxx

description: Graphene has attracted enormous interests due to its unique physical, mechanical, and electrical properties. Specially, graphene-based field-effect transistors (FETs) have evolved rapidly and are now considered as an option for conventional silicon devices. As a critical step in the design cycle of modern IC products, compact model refers to the development of models for integrated semiconductor devices for use in circuit simulations. The purpose of this review is to provide a theoretical description of current compact model of graphene field-effect transistors. Special attention is devoted to the charge sheet model, drift-diffusion model, Boltzmann equation, density of states (DOS), and surface-potential-based compact model. Finally, an outlook of this field is briefly discussed.
description: 18 pages, 20 figures
Evaluating the electron density model by applying an imaginary modification
Creators: name: Li, Hui
name: He, Meng
name: Zhang, Ze
Publisher: name: arXiv
Year: 2017
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: A function has been proposed to evaluate the electron density model constructed by inverse Fourier transform using the observed structure amplitudes and trial phase set. The strategy of this function is applying an imaginary electron density modification to the model, and then measuring how well the calculated structure amplitudes of the modified model matches the expected structure amplitudes for the modified correct model. Since the correct model is not available in advance, a method has been developed to estimate the structure amplitudes of the modified correct model. With the estimated structure amplitudes of the modified correct model, the evaluation function can be calculated approximately. Limited tests on simulated diffraction data indicate that this evaluation function may be valid at the data resolution better than 2.5 Å.
description: 5 figures
A fixed point formula and Harish-Chandra's character formula
Creators: name: Hochs, Peter
name: Wang, Hang
Publisher: name: arXiv
Year: 2017
Subjects: subject: Differential Geometry (math.DG)
subject: K-Theory and Homology (math.KT)
subject: Operator Algebras (math.OA)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics

description: The main result in this paper is a fixed point formula for equivariant indices of elliptic differential operators, for proper actions by connected semisimple Lie groups on possibly noncompact manifolds, with compact quotients. For compact groups and manifolds, this reduces to the Atiyah-Segal-Singer fixed point formula. Other special cases include an index theorem by Connes and Moscovici for homogeneous spaces, and an earlier index theorem by the second author, both in cases where the group acting is connected and semisimple. As an application of this fixed point formula, we give a new proof of Harish-Chandra's character formula for discrete series representations.
description: 45 pages; corrections and clarifications
Supergravity at 40: Reflections and Perspectives
Creators: name: Ferrara, S.
name: Sagnotti, A.
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Mathematical Physics (math-ph)
subject: History and Philosophy of Physics (physics.hist-ph)
subject: FOS: Physical sciences

description: The fortieth anniversary of the original construction of Supergravity provides an opportunity to combine some reminiscences of its early days with an assessment of its impact on the quest for a quantum theory of gravity.
description: 27 pages, LaTeX. Based in part on the talk delivered by S. F. at the "Infeld Colloquium and Discrete", in Warsaw, on December 1 2016, and on a joint CERN Courier article. Dedicated to John H. Schwarz on the occasion of his 75-th birthday. Comment and references added
Drei Steinarbeiten aus Nordwest-Argentinien im Staatlichen Museum für Völkerkunde München
Creators: name: Zerries, Otto
Publisher: name: INDIANA
Year: 1980

description: El Museo Etnográfico Estatal de Munich, en el cual Walter Lehmann estuvo a cargo de la sección americana entre los años 1910y 1913, adquirió a partir de 1968, por gestión del autor, tres objetos de piedra procedentes del noroeste argentino: un pequeño ídolo en forma de una mujer desnuda, de pie, realizado en piedra verde laminar; un cuenco rectangular, confeccionado en un material similar, que presenta figuras de víboras y hombres en relieve (presumiblemente utilizadas para consumo de drogas) y, por último, un gran mortero con dos rostros, de granito gris claro. Los tres objetos pertenecen presumiblemente a la cultura Ciénega y pueden ser datados entre los siglos I y III de nuestra era.
description: INDIANA, Bd. 6 (1980)
Räumliche und zeitliche Bezugspunktein mesoamerikanischen Konzeptenv om Mondzyklus
Creators: name: Köhler, Ulrich
Publisher: name: INDIANA
Year: 1982

description: Con este artículo se persigue la meta de revelar conceptos autóctonos de los indígenas mesoamericanos acerca del ciclo lunar. Desafortunadamente existen sólo muy pocas fuentes valuables; las más amplias provienen aún de investigaciones propias del autor, efectuadas entre los tzotzil de Chiapas. En el estudio se enfocan dos aspectos principales: las subdivisiones de la lunación como están registradas en los idiomas indígenas, y su posible determinación por su relación con puntos de referencia temporales o espaciales. Como resultados sostenidos por casi todas las fuentes, tanto antiguas como recientes, se hallaron:  1) Los puntos principales dentro del ciclo son: la primera aparición, la luna llena, el fin de su visibilidad, y su ausencia. 2) El ciclo empieza con la primera visibilidad de la luna por el poniente y no con la conjunción, la llamada 'luna nueva' de los conceptos europeos. Entre los resultados menos representativos están los siguientes: 1) La luna llena aparece como sustituto del sol. 2) La determinación de la edad lunar se realiza por la posición que ocupa la luna en el firmamento al anochecer o al amanecer. 3) La determinación de la edad lunar se realiza por su salida en relación con la subdivisión temporal tradicional de los indígenas . 4) Relacionado con el último método existe el de la determinación de la edad lunar hecha por la salida de la luna en relación con la posición de ciertos astros en su curso en el firmamento, refiriéndose notablemente a las Pléyades y a Venus (como estrella matutina).  La escasez de informaciones detalladas subraya la necesidad de practicar más investigaciones de campo en unfuturo cercano. El ejemplo de los ricos datos recientes que se poseen de los tzotzil sugiere y muestra claramente que aún hoy tal esfuerzo vale la pena.
description: INDIANA, Bd. 7 (1982)
Classical stability of higher-derivative q-theory in the four-form-field-strength realization
Creators: name: Klinkhamer, F. R.
name: Mistele, T.
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We show that higher-derivative $q$-theory in the four-form-field-strength realization does not suffer from the Ostrogradsky instability at the classical level.
description: 10 pages, v4: published version, expanded references
MPEC 2024-B142 : 2024 AD3
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
A Unified Model for Repeating and Non-repeating Fast Radio Bursts
Creators: name: Bagchi, Manjari
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The model that fast radio bursts are caused by plunges of asteroids onto neutron stars can explain both repetitive and non-repetitive bursts. If a neutron star passes through an asteroid belt around another star, there would be a series of bursts caused by series of asteroid impacts. Moreover, the neutron star would cross the same belt repetitively if it is in a binary with the star hosting the asteroid belt, leading to a repeated series of bursts. I explore the properties of neutron star binaries which could lead to the only known repetitive fast radio burst so far (FRB121102). In this model, the next two epochs of bursts are expected around 27-February-2017 and 18-December-2017. On the other hand, if the asteroid belt is located around the neutron star itself, then a chance fall of an asteroid from that belt onto the neutron star would lead to a non-repetitive burst. Even a neutron star grazing an asteroid belt can lead to a non-repetitive burst caused by just one asteroid plunge during the grazing. This is possible even when the neutron star is in a binary with the asteroid hosting star, if the belt and the neutron star orbit are non-coplanar.
description: 6 pages
Error-transparent quantum gates for small logical qubit architectures
Creators: name: Kapit, Eliot
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Physics (quant-ph)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: One of the largest obstacles to building a quantum computer is gate error, where the physical evolution of the state of a qubit or group of qubits during a gate operation does not match the intended unitary transformation. Gate error stems from a combination of control errors and random single qubit errors from interaction with the environment. While great strides have been made in mitigating control errors, intrinsic qubit error remains a serious problem that sets the primary limit for gate fidelity in modern superconducting qubit architectures. Simultaneously, recent developments of small error-corrected logical qubit devices promise significant increases in logical state lifetime, but translating those improvements into increases in gate fidelity is a complex challenge. In this Letter, we propose a new formalism for implementing gates on and between small logical qubit devices which inherit the parent device's tolerance to single qubit errors which occur at any time before or during the gate. Using a standard phenomenological noise model for superconducting qubits, we demonstrate a universal one- and two-qubit gate set with error rates an order of magnitude lower than those for equivalent operations on single qubits or pairs of qubits, running for the same total duration. The effective logical gate error rate in these models displays superlinear error reduction with linear increases in single qubit lifetime, proving that passive error correction is capable of increasing gate fidelity. These developments further suggest that incorporating small logical qubits into a measurement based code could substantially improve code performance.
description: 8 pages, 5 figures, includes supplemental information
The Mazapan Maps of Teotihuacan in 1560
Creators: name: Kubler, George
Publisher: name: INDIANA
Year: 1982

description: Los planos de San Francisco Mazapan retratan las ruinas del centro de Teotihuacan, con la pirámide de la Luna y la Ciudadela, en un área construida entre 150 a. C. y 750d. C. Estos tres planos, él de Nueva York (American Museum of Natural History, Plano Saville), él de Chicago (Newberry Library, Plano Ayer) y el de San Francisco Mazapan (ubicación desconocida) deben ser fechados como del año 1560 d. C. Las glosas en náhuatl fueron agregadas con posterioridad, posiblemente a principios del siglo XVll. Son similares en muchos detalles. El plano de Mazapan es una copia del siglo XIX (ubicación desconocida ) de un original perdido y puede provenir de una fuente primaria (también perdida). Se considera suposición en la historia de la cartografía de Teotihuacan y su relación con la mitología y cosmología aztecas es establecida en la ponencia. Los planos enseñan construcciones coloniales hoy en día destruidas y delinean propietarios indígenas, límites y cosechas. Muchas localidades de Teotihuacan están identificadas, así como lugares de interés arqueológico y mitológico. Ofrece un retrato de la vida colonial de la época temprana en una inmensa ruina precolombina, continua describiendo la situación cultural de Teotihuacan de la era después del abandono en el siglo Vlll d. C., según un patrón mesoamericano de ruina súbita, seguido por el retorno a la agricultura en grandes ciudades de piedra y yeso.
description: INDIANA, Bd. 7 (1982)
Hydrogenating VO2 with protons in acid solution
Creators: name: Chen, Yuliang
name: Wang, Zhaowu
name: Chen, Shi
name: Ren, Hui
name: Wang, Liangxin
name: Zhang, Guobin
name: Lu, Yalin
name: Jiang, Jun
name: Zou, Chongwen
name: Luo, Yi
Publisher: name: arXiv
Year: 2017
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences
subject: 82B27

description: Hydrogenation is an effective way to tune material property1-5. Traditional techniques for doping hydrogen atoms into solid materials are very costly due to the need for noble metal catalysis and high-temperature/pressure annealing treatment or even high energy proton implantation in vacuum condition5-8. Acid solution contains plenty of freely-wandering protons, but it is difficult to act as a proton source for doping, since the protons always cause corrosions by destroying solid lattices before residing into them. Here we achieve a facile way to hydrogenate monoclinic vanadium dioxide (VO2) with protons in acid solution by attaching suitable metal to it. Considering the Schottky contact at the metal/VO2 interface, electrons flow from metal to VO2 due to workfunction difference and simultaneously attract free protons in acid solution to penetrate, forming the hydrogens dopants inside VO2 lattice. This metal-acid treatment constitutes an electron-proton co-doping strategy, which not only protects the VO2 lattice from corrosion, but also causes pronounced insulator-to-metal transitions. In addition, the metal-acid induced hydrogen doping behavior shows a ripple effect, and it can spread contagiously up to wafer-size area (>2 inch) even triggered by a tiny metal particle attachment (~1.0mm). This will stimulate a new way of simple and cost-effective atomic doping technique for some other oxide materials.
description: 15 pages, 4 figures
Die Wurzeln der formativen Kulturen im östlichen Nordamerika
Creators: name: Lindig, Wolfgang
Publisher: name: INDIANA
Year: 1982

description: Recent archaeological research in the Midwestern United States has shown that the roots of the Formative of this area lie embedded in the autochthonous late Archaic cultures (Lake Forest and Central Archaic ), where local wild plants (sunflower, sumpweed, chenopodium) were domesticated and a burial cult had developed. Except for cucurbits tropical plants (maize and beans in several varieties) did not change Woodland economy to any great extent until the beginning of the Mississippi Period (seventh century A.D .). Likewise, the earliest pottery in the Ohio region (dated at the middle of the last millennium B.C.) developed locally after steatite or sandstone prototypes. Adena culture thus appears now as a result of local developments, not of Mesoamerican influences.
description: INDIANA, Bd. 7 (1982)
Nicolás de Valenzuelas "Relación" über die Lacandón-Expedition von 1695
Creators: name: Riese, Berthold
name: Heimann, Marie-Luise
Publisher: name: INDIANA
Year: 1977

description: Hasta ahora solamente se ha identificado y localizado una copia (Instituto Ibero-Americano, Berlin) de la "Relación" de Nicolás de Valenzuela sobre la expedición de 1695 al territorio de los lacandones . Las actas que sobre este particular se encuentran en el Archivo General de Indias de Sevilla concuerdan con el contenido de la "Relación". Sin embargo, no fueron estas actas las que sirvieron de base para la redacción de la "Relación", sino los originales de ellas, los cuales se suponen en el Archivo General de Centroamérica de Guatemala. Por medio de un detallado análisis del texto y de una comparación de toda la "Relación" con las actas originales de Guatemala se podría aclarar la posición exacta que corresponde a la copia de Berlín en el cuadro de los documentos relacionados. Esta comparación permitiría establecer además si la "Relación" es reducible en su totalidad a informaciones contenidas en las actas que sirvieron de base, o si acaso en ella figuran informaciones auténticas que son independientes de aquellas.
description: INDIANA, Bd. 4 (1977)
Lattice corrections to the quark quasidistribution at one-loop
Creators: name: Carlson, Carl E.
name: Freid, Michael
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We calculate radiative corrections to the quark quasidistribution in lattice perturbation theory at one loop to leading orders in the lattice spacing. We also consider one-loop corrections in continuum Euclidean space. We find the infrared behavior of the corrections in Euclidean and Minkowski space are different. We explore features of momentum loop integrals and demonstrate why loop corrections from the lattice perturbation theory and Euclidean continuum do not correspond with their Minkowski brethren, and comment on a recent suggestion for transcending the differences in the results. Further, we examine the role of the lattice spacing $a$ and of the $r$ parameter in the Wilson action in these radiative corrections.
description: 7 pages, 4 figures, v2 has added references, v3 has discussion of a recent paper
Three new roads to the Planck scale
Creators: name: Faraoni, Valerio
Publisher: name: arXiv
Year: 2017
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Three new heuristic derivations of the Planck scale are described. They are based on basic principles or phenomena of relativistic gravity and quantum physics. The Planck scale quantities thus obtained are within one order of magnitude of the "standard" ones. We contemplate the pair creation of causal bubbles so small that they can be treated as particles, the scattering of a matter wave off the background curvature of spacetime that it induces, and the Hawking evaporation of a black hole in a single burst at the Planck scale.
description: 10 pages, to appear in Am. J. Phys
La estructura verbal del otomí clásico
Creators: name: Kudlek, Manfred
Publisher: name: INDIANA
Year: 1982

description: Una de las lenguas menos conocidas del México antiguo es el otomí. Por un lado hay menos documentos y, por el otro, la estructura de la gramática es muy complicada comparándola con la del mexicano. Esta contribución trata especialmente del complejo verbal del otomí, entre otras cosas de los pronombres personales, de la estructura del verbo y de las mutaciones. Las mutaciones, comparables con las de las lenguas célticas, dan causa a muchas dificultades del otomí. Ciertos adverbios y verbos también hacen mutar las formas del verbo.
description: INDIANA, Bd. 7 (1982)
Recuay Gaming Boards: A Preliminary Study
Creators: name: John W., Smith
Publisher: name: INDIANA
Year: 1977

description: Las curiosas tablas de madera aquí tratadas, fueron interpretadas de los más diferentes modos, como ser: planos, mapas, ábacos o tableros de juego. Lo más probable, sin embargo, es que hayan formado parte de algún juego. El presente intento de reconstrucción de este juego consiste en la variación y estandarización de la disposición de los diversos elementos de los tableros. Las diferentes combinaciones que acaso hubiesen podido formar la base del juego en cuestión, son sometidas a un examen detenido y, finalmente, se exponen en detalle las posibles reglas, respectivamente el desarrollo del mismo.
description: INDIANA, Bd. 4 (1977)
Inflation from $(R+γR^n-2Λ)$ Gravity in Higher Dimensions
Creators: name: Ketov, Sergei V.
name: Nakada, Hiroshi
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We propose a derivation of the inflaton scalar potential from the higher $(D)$ dimensional $(R+γR^n-2Λ)$ gravity, with the new coupling constant $γ$ and the cosmological constant $Λ$. We assume that a compactification of extra dimensions happened before inflation, so that the inflaton scalar potential in four spacetime dimensions appears to be dependent upon the parameters $(γ,Λ,D,n)$. We find that consistency requires $n=D/2$, while the dimension $D$ has to be a multiple of four. We calculate the potential for any $D$, and determine the values of $γ$ and $Λ$ from observations. The cases of $D=8$ and $D=12$ are considered in more detail. Our approach results in the viable models of chaotic large-field inflation, and leads to the sharp predictions of an observable value of the tensor-to-scalar ratio $r$ of the Cosmic Microwave Background radiation.
description: 13 pages, 2 figures, LaTeX2e; more comments and references added
La cerámica inca de Chinchero, Perú
Creators: name: Rivera-Dorado, Miguel
Publisher: name: INDIANA
Year: 1977

description: En el curso de las excavaciones practicadas por una Misión Española entre los años 1968-1970 en el municipio de Chinchero, Departamento de Cuzco, en el Perú, fue recuperado un número considerable de fragmentos de cerámica inca. Estos hallazgos, cuyo análisis y descripción se intentará a continuación, pueden constituir una aportación interesante para el mejor conocimiento de la cultura inca, ya que la muestra obtenida en Chinchero, siendo relativamente abundante, permite un estudio detenido de los diversos grupos tipológicos de la alfarería de esta región. Finalmente se propone como conclusión y a manera experimental una clasificación en cinco grupos para definir la cerámica del Imperio incaico.
description: INDIANA, Bd. 4 (1977)
Filtering Tweets for Social Unrest
Creators: name: Mishler, Alan
name: Wonus, Kevin
name: Chambers, Wendy
name: Bloodgood, Michael
Publisher: name: arXiv
Year: 2017
Subjects: subject: Computation and Language (cs.CL)
subject: Information Retrieval (cs.IR)
subject: Machine Learning (cs.LG)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences
subject: H.3.3; I.2.6; I.2.7; I.5.4

description: Since the events of the Arab Spring, there has been increased interest in using social media to anticipate social unrest. While efforts have been made toward automated unrest prediction, we focus on filtering the vast volume of tweets to identify tweets relevant to unrest, which can be provided to downstream users for further analysis. We train a supervised classifier that is able to label Arabic language tweets as relevant to unrest with high reliability. We examine the relationship between training data size and performance and investigate ways to optimize the model building process while minimizing cost. We also explore how confidence thresholds can be set to achieve desired levels of performance.
description: 7 pages, 8 figures, 3 tables; published in Proceedings of the 2017 IEEE 11th International Conference on Semantic Computing (ICSC), San Diego, CA, USA, pages 17-23, January 2017
Excavaciones en Sama (Dpto. Tacna, Perú)
Creators: name: Trimborn, Hermann
Publisher: name: INDIANA
Year: 1977

description: El artículo relata brevemente el redescubrimiento de la población prehispánica de Sama, en el curso medio del río de igual nombre, en el Sur del Perú. En 1567 Garci Diez de San Miguel nos informa sobre las colonias de los lupaqa, un grupo aimara ubicado en la ribera occidental del lago Titicaca, en algunos valles que conducen a la costa del Pacífico. Estos oasis de los lupaqa existían en los últimos siglos antes de la Conquista y representaban una conexión de las posibilidades ecológicas de los valles regados y del altiplano. El punto de gravedad de los asentamientos en el valle de Sama estaba situado sobre una terraza fluvial en aquel lugar donde el río abandona la sierra y entra en una amplia vega. En el momento de su redescubrimiento se presentó como una acumulación de montículos dispersos y enterrados bajo la arena, cuya excavación empezó en 1972 y fue continuada en 1975, en una colaboración de arqueólogos alemanes y peruanos. Fueron dos objetos que ante todo llamaron la atención de los investigadores: un evidente puesto de mando que sobresalía del nivel de la terraza de igual modo como los restos de una iglesia de la época colonial temprana, aparte de numerosas agrupaciones de piedras como fundamentos de antiguas habitaciones que aparentemente habían sido construidas de material vegetal. La destrucción y el abandono de Sama sucedieron probablemente en 1Ó04, como consecuencia de un terremoto que iba unido con una erupción del volcán Huainaputina y causó el éxodo de los habitantes en dirección al Arica actual.
description: INDIANA, Bd. 4 (1977)
La monarquía del mundo Guamán Poma de Ayala
Creators: name: Zavala, Silvio
Publisher: name: INDIANA
Year: 1977

description: Influido por las reminiscencias del pasado incaico, el cronista peruano Guarnan Poma de Ayala propone hacia 1613 al rey de España, Felipe III, que ejerza la monarquía del mundo rodeado de otros cuatro príncipes que representarían las cuatro partes del mundo (Europa, Asia, América, África). Al mismo tiempo proclama los derechos del español en Castilla, del indio en las Indias, del negro en Guinea, es decir, de cada natural en su reino. Admite la soberanía del monarca español - que para él rige en el mundo - y la extensión de la fe católica, pero reclama el respeto a los derechos de los naturales en su propio reino.
description: INDIANA, Bd. 4 (1977)
A Distributed Nash Equilibrium Seeking in Networked Graphical Games
Creators: name: Salehisadaghiani, Farzad
name: Pavel, Lacra
Publisher: name: arXiv
Year: 2017
Subjects: subject: Computer Science and Game Theory (cs.GT)
subject: Systems and Control (eess.SY)
subject: Optimization and Control (math.OC)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Mathematics

description: This paper considers a distributed gossip approach for finding a Nash equilibrium in networked games on graphs. In such games a player's cost function may be affected by the actions of any subset of players. An interference graph is employed to illustrate the partially-coupled cost functions and the asymmetric information requirements. For a given interference graph, network communication between players is considered to be limited. A generalized communication graph is designed so that players exchange only their required information. An algorithm is designed whereby players, with possibly partially-coupled cost functions, make decisions based on the estimates of other players' actions obtained from local neighbors. It is shown that this choice of communication graph guarantees that all players' information is exchanged after sufficiently many iterations. Using a set of standard assumptions on the cost functions, the interference and the communication graphs, almost sure convergence to a Nash equilibrium is proved for diminishing step sizes. Moreover, the case when the cost functions are not known by the players is investigated and a convergence proof is presented for diminishing step sizes. The effect of the second largest eigenvalue of the expected communication matrix on the convergence rate is quantified. The trade-off between parameters associated with the communication graph and the ones associated with the interference graph is illustrated. Numerical results are presented for a large-scale networked game.
Absence of magnetic long range order in Ba$_3$ZnRu$_2$O$_9$: A spin-liquid candidate in the $S=3/2$ dimer lattice
Creators: name: Terasaki, Ichiro
name: Igarashi, Taichi
name: Nagai, Takayuki
name: Tanabe, Kenji
name: Taniguchi, Hiroki
name: Matsushita, Taku
name: Wada, Nobuo
name: Takata, Atsushi
name: Kida, Takanori
name: Hagiwara, Masayuki
name: Kobayashi, Kensuke
name: Sagayama, Hajime
name: Kumai, Reiji
name: Nakao, Hironori
name: Murakami, Youichi
Publisher: name: arXiv
Year: 2017
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We have discovered a novel candidate for a spin liquid state in a ruthenium oxide composed of dimers of $S = $ 3/2 spins of Ru$^{5+}$,Ba$_3$ZnRu$_2$O$_9$. This compound lacks a long range order down to 37 mK, which is a temperature 5000-times lower than the magnetic interaction scale of around 200 K. Partial substitution for Zn can continuously vary the magnetic ground state from an antiferromagnetic order to a spin-gapped state through the liquid state. This indicates that the spin-liquid state emerges from a delicate balance of inter- and intra-dimer interactions, and the spin state of the dimer plays a vital role. This unique feature should realize a new type of quantum magnetism.
description: 5 pages, 4 figures
Zu einem Zusammenhang zwischen Keru-Malerei und Cuzco-Schule
Creators: name: Fischer-Hollweg, Brigitte
Publisher: name: INDIANA
Year: 1977

description: En el siguiente ensayo se trata de comprobar una afinidad entre los kerues indígenas y las pinturas cuzqueñas más diversas (principalmente hechas por mestizos) en base a similitudes de estilo. Una alusión al respecto se encuentra también en la "Nueva Corónica" de Guamán Poma de Ayala, que no hace diferencia entre pintores de kerues y pintores de cuadros. A modo de ejemplo se comparan dos kerues del Museo Estatal de Etnografía en Munich (Völkerkundemuseum), probablemente realizados poco antes o inmediatamente después de la Conquista (número de catálogo 285 y 276) con tres cuadros típicos de la escuela cuzqueña.
description: INDIANA, Bd. 4 (1977)
Beam energy scan theory: Status and open questions
Creators: name: Petersen, H.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The goal of heavy ion reactions at low beam energies is to explore the QCD phase diagram at high net baryon chemical potential. To relate experimental observations with a first order phase transition or a critical endpoint, dynamical approaches for the theoretical description have to be developed. In this summary of the corresponding plenary talk, the status of the dynamical modeling including the most recent advances is presented. The remaining challenges are highlighted and promising experimental measurements are pointed out.
description: 8 pages, 10 figures; updated with the version accepted for publication in the proceedings for Quark Matter 2017; only minor changes
Embedding FLRW Geometries in Pseudo-Euclidean and Anti-de Sitter Spaces
Creators: name: Akbar, M. M.
Publisher: name: arXiv
Year: 2017
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences
subject: 30L05, 53B30

description: Contrary to the general consensus in the literature that Friedmann--Lemaître--Robertson--Walker (FLRW) geometries are of embedding class one (i.e.,\ embeddable in one higher dimensional pseudo-Euclidean spaces), we show that the most general $k=0$ and $k=-1$ FLRW geometries are of embedding class two, and their corresponding pseudo-Euclidean spaces have strictly one and two negative eigenvalues, respectively. These are particular results that follow from the new perspective on FLRW embedding that we develop in this paper, namely that these embeddings are equivalent to unit-speed parametrized curves in two or three dimensions. A careful analysis of appropriate tensor fields then gives identical results and further explains why the class-two geometries remained hidden. However, the signatures of the embedding spaces, as well as the explicit embedding formulae, follow only from the curve picture. This also streamlines the comparatively difficult $k=0$ class and provides new explicit embedding formulae for it and reproduces known embedding formulae for the $k=1,-1$ classes. Embedding into anti-de Sitter space in one higher dimension can likewise be done by constructing associated curves. In particular, we find that all $k=1$ and mildly restricted subclasses of $k=0, -1$ geometries are embeddable in anti-de Sitter space in one higher dimension.
description: 17 pages. Minor changes, mostly reflecting journal's editorial style; one missing reference added
La survivance d´un vase portrait mochica
Creators: name: Hocquenghem, Anne Marie
Publisher: name: INDIANA
Year: 1977

description: En el año 1972, la autora pudo adquirir en el mercado de Cajamarca (norte del Perú) dos vasijas modernas, las que - confeccionadas según la tradición alfarera local - ostentaban una gran similitud con un tipo determinado de las conocidas "vasijas-retrato" de la cultura mochica. Como modelo para estas obras, le sirvió al alfarero lugareño una pieza que había visto en la escuela de su hijo. Mientras que él, según sus propias palabras, confecciono las vasijas "para adornar no más", se sigue desconociendo hasta la fecha la función verdadera de los huacos.
description: INDIANA, Bd. 4 (1977)
Woody Plant Species Diversity, Structure and Regeneration Status of Woynwuha Natural Forest, North West Ethiopia
Creators: name: Mekonen, Temesgen
name: Ayele, Belayneh
name: Ashagrie, Yeshanew
Publisher: name: Journal of Agriculture and Environmental Sciences
Year: 2019

description: A study was conducted in Woynwuha natural forest, North West Ethiopia to investigate woody plant species diversity, structure, and regeneration status of the forest. A total of 50 square quadrats each having an area of 625m2 were used for vegetation data collection. Vegetation data were collected through field observation, species counting, speciemen collection and height and DBH measurements. Data was analysed using Shannon Weiner diversity index, Simpson's index, important value index and height and diameter distribution graphs. A total of 69 woody plant species belonging to 41 families and 59 genera were recorded. Fabaceae was the most species-rich family in the area. The overall average Shannon-Wiener Diversity Index (H`) was 3.24 and the average evenness values (E’) was 0.76 indicating high diversity with more or less even distribution. The computational result of the important value index indicated that Carissa edulis was ecologically most important species. The tree cumulative diameter class frequency distribution in general resembles interrupted inverted-J- shape pattern indicating the existence of much seedling than big sized trees. The same pattern was also observed with regard to height class distribution indicating the selective removal of higher trees by the local communities.
description: Journal of Agriculture and Environmental Sciences, Vol 1 No 2 (2015)
Interplay of interfacial noise and curvature driven dynamics in two dimensions
Creators: name: Roy, Parna
name: Sen, Parongama
Publisher: name: arXiv
Year: 2017
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We explore the effect of interplay of interfacial noise and curvature driven dynamics in a binary spin system. An appropriate model is the generalised two dimensional voter model proposed earlier (J. Phys. A: Math. Gen. {\bf 26}, 2317 (1993)), where the flipping probability of a spin depends on the state of its neighbours and is given in terms of two parameters $x$ and $y$. $x = 0.5, y =1$ corresponds to the conventional voter model which is purely interfacial noise driven while $x = 1 $ and $y = 1$ corresponds to the Ising model, where coarsening is fully curvature driven. The coarsening phenomena for $0.5< x < 1$ keeping $y=1$ is studied in detail. The dynamical behaviour of the relevant quantities show characteristic differences from both $x=0.5$ and $1$. The most remarkable result is the existence of two time scales for $x\ge x_c$ where $x_c \approx 0.7$. On the other hand, we have studied the exit probability which shows Ising like behaviour with an universal exponent for any value of $x > 0.5$; the effect of $x$ appears in altering the value of the parameter occurring in the scaling function only.
description: 5 pages, 7 figures, published in PRE Rapid communication
Informaciones sobre la religión guayabera (Oriente de Colombia)
Creators: name: Schindler, Helmut
Publisher: name: INDIANA
Year: 1977

description: Los guayabero se imaginan el cosmos compuesto por varios niveles. Uno de éstos está habitado por los hombres; los otros por los difuntos, que llevaron una vida recta, y por personajes mitológicos, que han tomado parte en la formación del mundo de varias maneras. Las narraciones describen, por ejemplo, cómo uno de ellos formó la tierra firme, otro indujo la formación de la primera mujer y transformó en animales a hombres que contravinieron normas, mientras otro dejó elegir a los grupos humanos sus diferentes costumbres. Además, en el texto se encuentran caracterizados varios de los demonios que los hombres tienen que enfrentar.
description: INDIANA, Bd. 4 (1977)