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Documentos disponibles de esta editorial (292)
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Guerrero Roman, Merce ; Mora Pérez, Gerardo ; Olmo, Gonzalo J. ; Orazi, Emanuele ; Rubiera García, Diego | IOP publishing ltd | 2020-07We find an exact, rotating charged black hole solution within Eddington-inspired Born-Infeld gravity. To this end we employ a recently developed correspondence or mapping between modified gravity models built as scalars out of contractions of th[...]texto impreso
We consider electron dynamics in two-band semiconductor superlattices within the envelope function approximation. We develop a numerical method, based on the properties of the periodic continued fractions, to find the dispersion relation inside [...]texto impreso
Ballesteros, H.G. ; Fernández Pérez, Luis Antonio ; Martín Mayor, Víctor ; Muñoz Sudupe, Antonio ; Parisi, G. ; Ruiz Lorenzo, J. J. | IOP publishing ltd | 1999-01-08Using Finite-Size Scaling techniques we obtain accurate results for critical quantities of the Ising model and the site percolation, in three dimensions. We pay special attention in parameterizing the corrections-to-scaling, what is necessary to[...]texto impreso
Dislocation lines in {110} sections of In-doped GaAs are imaged by scanning electron acoustic microscopy (SEAM). Cathodoluminescence measurements show the presence of a high indium concentration at dislocations. It is proposed that the semi-insu[...]texto impreso
Nogales Díaz, Emilio ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Plugaru, R | IOP publishing ltd | 2001-09Scanning tunnelling microscopy (STM) has been sometimes applied in recent years to characterize porous silicon. In contrast, other forms of light emitting Si, such as nanocrystalline silicon films, prepared by different methods, have not been, o[...]texto impreso
Urbieta Quiroga, Ana Irene ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier ; Sekiguchi, T. | IOP publishing ltd | 2001-07Bulk ZnO single crystals grown by the hydrothermal and flux methods have been characterized by scanning tunnelling spectroscopy performed in the different crystalline faces. Normalized differential conductance has been found to depend on the fac[...]texto impreso
Arqueros Martínez, Fernando ; García Pinto, Diego ; Minaya Flores, Ignacio Andrés ; Rosado Vélez, Jaime ; Vázquez Peñas, José Ramón | IOP publishing ltd | 2016-01This paper presents the results of different searches for correlations between very high-energy neutrino candidates detected by IceCube and the highest-energy cosmic rays measured by the Pierre Auger Observatory and the Telescope Array. We first[...]texto impreso
Arqueros Martínez, Fernando ; García Pinto, Diego ; Minaya Flores, Ignacio Andrés ; Vázquez Peñas, José Ramón ; otros, ... | IOP publishing ltd | 2017-04A search for ultra-high energy photons with energies above 1 EeV is performed using nine years of data collected by the Pierre Auger Observatory in hybrid operation mode. An unprecedented separation power between photon and hadron primaries is a[...]texto impreso
Arganda, E. ; Arqueros Martínez, Fernando ; Blanco Ramos, Francisco ; García Pinto, Diego ; Minaya Flores, Ignacio Andrés ; Ortiz Ramis, Montserrat ; Rosado Vélez, Jaime ; Vázquez Peñas, José Ramón | IOP publishing ltd | 2012-12-01A thorough search of the sky exposed at the Pierre Auger Cosmic Ray Observatory reveals no statistically significant excess of events in any small solid angle that would be indicative of a flux of neutral particles from a discrete source. The se[...]texto impreso
Arqueros Martínez, Fernando ; Blanco Ramos, Francisco ; García Pinto, Diego ; Minaya Flores, Ignacio Andrés ; Ortiz Ramis, Monserrat ; Rosado Vélez, Jaime ; Vázquez Peñas, José Ramón | IOP publishing ltd | 2014-07-10Measurements of air showers made using the hybrid technique developed with the fluorescence and surface detectors of the Pierre Auger Observatory allow a sensitive search for point sources of EeV photons anywhere in the exposed sky. A multivaria[...]texto impreso
Barrio Uña, Juan Abel ; Bonnefoy, Simon Francois Albert ; Contreras González, José Luis ; Dominguez, A. ; Fidalgo, D. ; Fonseca González, Mª Victoria ; López, M. ; Rosillo Nievas, Mirella ; otros, ... | IOP publishing ltd | 2017-01-01Blazars are variable emitters across all wavelengths over a wide range of timescales, from months down to minutes. It is therefore essential to observe blazars simultaneously at different wavelengths, especially in the X-ray and gamma-ray bands,[...]texto impreso
Aranda, V. M. ; Arqueros Martínez, Fernando ; García Pinto, Diego ; Minaya Flores, Ignacio Andrés ; Rosado, J. ; Vázquez Peñas, José Ramón | IOP publishing ltd | 2015-05-01We analyze the distribution of arrival directions of ultra-high-energy cosmic rays recorded at the Pierre Auger Observatory in 10 years of operation. The data set, about three times larger than that used in earlier studies, includes arrival dire[...]texto impreso
Antoranz Canales, Pedro ; Barrio Uña, Juan Abel ; Contreras González, José Luis ; Fonseca González, Mª Victoria ; López Moya, Marcos ; Miranda Pantoja, José Miguel ; Scapin, Valeria | IOP publishing ltd | 2011-06We report the results of the observation of the nearly satellite galaxy Segue 1 performed by the MAGIC-I ground-based gamma-ray telescope between November 2008 and March 2009 for a total of 43.2 hours. No significant gamma-ray emission was found[...]texto impreso
Piqueras de Noriega, Javier ; Fernández Sánchez, Paloma ; Ortega Villafuerte, Yanicet | IOP publishing ltd | 2011-08Al-doped ZnO nanorod networks and other microstructures have been grown by a thermal evaporation–deposition method with a mixture of ZnS and Al_2O_3 powders as precursor. Some of the grown structures consist of star-like arrays of nanorods arran[...]texto impreso
An iterative algorithm for determining a class of solutions of the dispersionful 2-Toda hierarchy characterized by string equations is developed. This class includes the solution which underlies the large N-limit of the Hermitian matrix model in[...]texto impreso
Gómez Gómez, José María ; Faleiro, E. ; Muñoz, L. ; Molina, R. A. ; Relaño Pérez, Armando | IOP publishing ltd | 2015Shell-model calculations with realistic empirical interactions constitute an excellent tool to study statistical properties of nuclei. Using large-scale shell-model calculations in pf-shell nuclei, we study how the onset of chaos depends on diff[...]texto impreso
A discretized form of the one-dimensional Dirac equation is solved to study relativistic band structures. Properties of periodic continued fractions are used to find the dispersion relation inside allowed bands. The Mathieu potential is consider[...]texto impreso
Ivanov, Peter A. ; Porras Torres, Diego ; Ivanov, Svetoslav S. ; Schmidt-Kaler, Ferdinand | IOP publishing ltd | 2013-05-28We study theoretically the collective E circle times e Jahn-Teller-Dicke distortion in a system of trapped ions. In a previous work (Porras et al 2012 Phys. Rev. Lett. 108 235701) we have focused on cooperative Jahn-Teller models consisting of a[...]texto impreso
Cassatella-Contra, Giovanni A ; Mañas Baena, Manuel ; Tempesta, Piergiulio | IOP publishing ltd | 2014-09We study the analytic properties of a matrix discrete system introduced by Cassatella and Manas (2012 Stud. Appl. Math. 128 252-74). The singularity confinement for this system is shown to hold generically, i.e. in the whole space of parameters [...]texto impreso
Hidalgo Alcalde, Pedro ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier | IOP publishing ltd | 2008-11-12Sn doped GeO_2 nanowires and microwires have been grown by an evaporation-deposition method, using a mixture of Ge and SnO_2 powders as precursors. Comparison with undoped GeO_2 nanowires grown by the same method shows that the presence of Sn pr[...]texto impreso
The class of solvable Lie algebras with an N-graded nilradical of maximal nilpotency index is classified. It is shown that such solvable extensions are unique up to isomorphism. The generalized Casimir invariants for the N-graded nilradicals and[...]texto impreso
Ruiz Cembranos, José Alberto ; Dobado González, Antonio ; López Maroto, Antonio | IOP publishing ltd | 2007-06-22In this work, we will review the main properties of braneworld models with low tension. Starting from very general principles, it is possible to obtain an effective action for the relevant degrees of freedom at low energies (branons). Using the [...]texto impreso
Pal, U. ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier ; Serrano, M. D. ; Dieguez, E. | IOP publishing ltd | 1994The nature of the 1.4eV band in CdTe is studied by cathodoluminescence. Results indicate that the band is not related only to surface defects.texto impreso
Catalán Torrecilla, C. ; Castillo Morales, África ; Gil de Paz, Armando ; Gallego Maestro, Jesús ; Chamorro Cazorla, Mario ; Pascual Ramírez, Sergio ; Cardiel López, Nicolás ; Dullo, Bililign | IOP publishing ltd | 2020-02-06We present a comprehensive analysis of the multiphase structure of the interstellar medium (ISM) and the stellar kinematics in the edge-on nearby galaxy UGC 10205 using integral field spectroscopy (IFS) data taken with MultiEspectrógrafo en GTC [...]texto impreso
We study the moduli space of the spectral curves y ^2 = W ‘ (z) ^2 + f(z) which characterize the vacua of N = 1 U(n) supersymmetric gauge theories with an adjoint Higgs field and a polynomial tree level potential W(z). The integrable structure o[...]texto impreso
López Maroto, Antonio ; Ruiz Cembranos, José Alberto ; Gammaldi, Viviana | IOP publishing ltd | 2013-04We study the main spectral features of the gamma-ray fluxes observed by the High Energy Stereoscopic System (HESS) from the J1745-290 Galactic Center source during the years 2004, 2005 and 2006. In particular, we show that these data are well fi[...]texto impreso
Bisigello, L. ; Caputi, K.I. ; Colina, L. ; Pérez González, Pablo Guillermo ; Koekemoer, A. ; Le Fèvre, O. ; Grogin, N. ; Norgaard-Nielsen, H.U. ; Van der Werf, P. | IOP publishing ltd | 2019-04Stellar masses in future James Webb Space Telescope (JWST) deep blank fields will be mainly derived by fitting the spectral energy distribution (SED) with theoretical galaxy templates. We investigate the uncertainties and biases of the stellar m[...]texto impreso
In this talk I briefly review the status of the f(0)(500) and f(0)(980) together with the other light scalar resonances, as well as the emerging picture of a non-ordinary light meson multiplet, paying particular attention to unitarized Chiral Pe[...]texto impreso
Cornide Castro-Piñeiro, Manuel ; Fernández Figueroa, María José ; Castro Rubio, Elisa de ; Armentia, J. A. ; Reglero, V. | IOP publishing ltd | 1992-04High dispersion spectra have been obtained in order to study the activity level of ten barium stars by means of the Ca II H and K emission flux, looking for a relation between barium intensity index and activity. Absolute magnitudes obtained fro[...]texto impreso
Llanes Estrada, Felipe José ; Cabrera, Daniel ; Luciano M., Abreu ; Bratkovskaya, Elena ; Ramos, Angels ; Torres Rincón, Juan M. | IOP publishing ltd | 2014We present selected results on the properties of strange and heavy-flavoured mesons in a hot and dense nuclear medium, with emphasis in selfconsistent coupled-channel approaches based on the chiral Lagrangian. In the strangeness sector, we discu[...]texto impreso
Díaz-Guerra Viejo, Carlos ; Montone, A. ; Piqueras de Noriega, Javier ; Cardellini, F. | IOP publishing ltd | 2002-01The structural and luminescent properties of nanocrystalline silicon produced by high-energy ball milling of Si single crystals have been investigated using transmission electron microscopy (TEM), x-ray diffraction (XRD) and cathodoluminescence [...]texto impreso
Muñoz San Martín, Sagrario ; Sebastián Franco, José Luis ; Sancho Ruíz, Miguel ; Miranda Pantoja, José Miguel | IOP publishing ltd | 2003-06-07This paper shows the importance of using realistic cell shapes with the proper geometry and orientation to study the mechanisms of direct cellular effects from radiofrequency (RF) exposure. For this purpose, the electric field distribution withi[...]texto impreso
Mártil de la Plaza, Ignacio ; González Díaz, Germán ; Olea Ariza, Javier ; Prado Millán, Álvaro del | IOP publishing ltd | 2013-12In this work we present the manufacturing processes and results obtained from the characterization of heterojunction with intrinsic thin layer solar cells that include a heavily Ti ion implanted Si absorbing layer. The cells exhibit external cir[...]texto impreso
The scope of this paper is to analyse the effect of Au and Cr impurities, diffused onto GaSb substrates on the formation of nanodots created by LEIS using Ar+ ions It is concluded that oblique incidence in rotating configuration delays the forma[...]texto impreso
Guerrero, E. ; Muñoz Márquez, M. A. ; García, M. A. ; Crespo del Arco, Patricia ; Fernandez Pinel, E. ; Hernando Grande, Antonio ; Fernández, A. | IOP publishing ltd | 2008-04-30Surface plasmon resonance measurements and magnetic characterization studies have been carried out for two types of thiol-capped gold nanoparticles (NPs) with similar diameters between 2.0 and 2.5 nm and different organic molecules linked to the[...]texto impreso
Antonov, A. N. ; Gaidarov, M. K. ; Kadrev, D. N. ; Sarriguren, P. ; Moya de Guerra, Elvira | IOP publishing ltd | 2018We derive the volume and surface components of the nuclear symmetry energy (NSE) and their ratio within the coherent density fluctuation model. The estimations use the results of the model for the NSE in finite nuclei based on the Brueckner and [...]texto impreso
Kawai, Shigeki ; Pina Martínez, Carlos Manuel ; Bubendorf, Alexander ; Fessler, Gregor ; Glatzel, Thilo ; Gnecco, Enrico ; Meyer, Ernest | IOP publishing ltd | 2013We have investigated the morphology and structure of dolomite MgCa.CO3/2.104/ surfaces by bimodal dynamic force microscopy with flexural and torsional resonance modes in ultra-high vacuum at room temperature. We found that the surface slowly dec[...]texto impreso
Abuín Herráez, Manuel ; Maicas, Marco ; García, M Ángel ; Pérez García, Lucas ; Mascaraque Susunaga, Arantzazu | IOP publishing ltd | 2017-12-06We have fabricated Fe52-54Co46-48 nanomagnet arrays as a function of several geometrical parameters like the spacing between nanostructures, the aspect ratio and the layers thicknesses. The nanomagnets consist in two magnetic layers, separated b[...]texto impreso
Arqueros Martínez, Fernando ; Blanco Ramos, Francisco ; García Pinto, Diego ; Minaya Flores, Ignacio Andrés ; Ortiz Ramis, Montserrat ; Rosado Vélez, Jaime ; Vázquez Peñas, José Ramón | IOP publishing ltd | 2013-04The Pierre Auger Observatory in Malargue, Argentina, is designed to study the properties of ultra-high energy cosmic rays with energies above 10(18) eV. It is a hybrid facility that employs a Fluorescence Detector to perform nearly calorimetric [...]texto impreso
What can we say about the spectra of a collection of microscopic variables when only their coarse-grained sums are experimentally accessible? In this paper, using the tools and methodology from the study of quantum nonlocality, we develop a math[...]texto impreso
The bulk of the stellar growth over cosmic time is dominated by IR-luminous galaxies at cosmic noon (z = 1–2), many of which harbor a hidden active galactic nucleus (AGN). We use state-of-the-art infrared color diagnostics, combining Spitzer and[...]texto impreso
Dullo, Bililign T. ; Bouquin, Alexandre Y. K. ; Gil de Paz, Armando ; Knapen, Johan H. ; Gorgas García, Francisco Javier | IOP publishing ltd | 2020-07Tight correlations between supermassive black hole (SMBH) mass (M_(BH)) and the properties of the host galaxy have useful implications for our understanding of the growth of SMBHs and evolution of galaxies. Here, we present newly observed correl[...]texto impreso
Barrio Uña, Juan Abel ; Contreras González, José Luis ; Domínguez Díaz, Alberto ; Carreto Fidalgo, David Friedrich ; Fonseca González, Victoria ; Hoang, Kim Dinh ; López Moya, Marcos ; Nievas Rosillo, Mireia ; Peñil del Campo, Pablo ; Saha, Lab | IOP publishing ltd | 2018-08-10A neutrino with energy similar to 290 TeV, IceCube-170922A, was detected in coincidence with the BL Lac object TXS. 0506+056 during enhanced gamma-ray activity, with chance coincidence being rejected at similar to 3 sigma level. We monitored the[...]texto impreso
The even-even N=90 isotones with Z=60-66 are known to undergo a first order phase transition. Such a phase transition in atomic nuclei is characterized by a sudden change of the shape of the nucleus due to changes in the location of the potentia[...]texto impreso
We investigate the burstiness of star formation histories (SFHs) of galaxies at 0.4texto impreso
Pérez González, Pablo Guillermo ; Alcalde Pampliega, Belén ; Cardiel López, Nicolás ; Espino Briones, Néstor ; Hernán Caballero, Antonio | IOP publishing ltd | 2019-08We present a WFC3 F160W (H-band) selected catalog in the CANDELS/GOODS-N field containing photometry from the ultraviolet (UV) to the far-infrared (IR), photometric redshifts, and stellar parameters derived from the analysis of the multiwaveleng[...]texto impreso
K2-18 is a nearby M2.5 dwarf, located at 34 pc and hosting a transiting planet that was first discovered by the K2 mission and later confirmed with Spitzer Space Telescope observations. With a radius of similar to 2 R-circle plus and an orbital [...]texto impreso
Madore, Barry F. ; Gil de Paz, Armando ; Pevunova, Olga ; Thompson, Ian | IOP publishing ltd | 2007-07The object NGC 6908 was once thought to simply be a surface brightness enhancement in the eastern spiral arm of the nearby spiral galaxy NGC 6907. Based on an examination of near-infrared imaging, the object is shown to in fact be a lenticular S[...]texto impreso
Critical points of semiclassical expansions of solutions to the dispersionful Toda hierarchy are considered and a double scaling limit method of regularization is formulated. The analogues of the critical points characterized by the strong condi[...]texto impreso
Jeskel, Jan ; Rivas, Ángel ; Ahmed, Muhammad H. ; Martín-Delgado Alcántara, Miguel Ángel ; Cole, Jared H. | IOP publishing ltd | 2018-09-18The dynamics and thermal equilibrium of spin waves (magnons) in a quantum ferromagnet as well as the macroscopic magnetisation are investigated. Thermal noise due to an interaction with lattice phonons and the effects of spatial correlations in [...]