Seminarios
Seminarios científicos impartidos por científicos y tecnólogos del IAA y de los muchos centros e instituciones de investigación que nos visitan. Muestra del intenso intercambio científico, se celebra a las 12:30 de cada jueves. Los seminarios se retransmiten en directo en IAA - CSIC Seminars Live.
Instrucciones
Para más información contactar con seminars (at) iaa.es.
701 - 750 de un total de 1201
Pages
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24/03/2006 - 13:00
The many lives of AGN: from super-massive black holes to host galaxy colours and luminosities I use a detailed self-consistent model of galaxy formation and the Millennium Run LCDM N-body simulation to explore the evolution of the galaxy population, including super-massive black hole growth, in a cosmological context. Motivated by observations of local cooling flow systems I propose two modes of AGN activity, the merger driven high energy 'quasar' mode and the quiescent low energy 'radio' mode. I focus on the effect that 'radio' AGN... Darren Croton UC Berkeley |
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21/03/2006 - 13:00
TBD Tbd Holland Ford Instituto de Astrofísica de Andalucía - CSIC |
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06/03/2006 - 13:00
A Comprehensive Spitzer Survey of High-z Radio Galaxies Observational evidence suggests that Radio Galaxies are hosted by massive elliptical galaxies (M_sun=10**[11.5-12]) at every redshift. Using Spitzer we can for the first time measure the peak of the stellar luminosity at rest-frame NIR. From a sample of the 70 most well studied HzRGs we can directly derive their stellar mass from modeling of the SEDs using IRAC and MIPS data, and we find that radio galaxies are indeed hosted by massive galaxies... Nick Seymour Spitzer Science Center - Caltech |
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02/03/2006 - 13:00
UDP & DECOs. Un sistema de gestión integral de scripts. Los scripts son una poderosa herramienta de programación aplicable a las fases de validación y producción de Software. Se presentará un Sistema de trabajo altamente automatizado basado en scripts (DEfined COmmand y User Defined Program) que contempla desde su creación, documentación y validación hasta su ejecución. Así mismo se analizarán las ventajas, limitaciones y trabajos futuros de dicho Sistema. Por último se realizará una demostración... Pablo Mellado & Rafael Morales Instituto de Astrofísica de Andalucía - CSIC |
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24/02/2006 - 13:00
The Hubble ultra-deep field The Hubble Ultra Deep Field (UDF) provides us with our deepest view to date of the visible universe. The UDF ACS images cover twice the area of the previous Hubble Deep Fields and are about 1 magnitude deeper. NICMOS near-IR images of the UDF allow us to probe beyond redshift 6, perhaps to the era of reionization. I will discuss this reionization question as well as our own research, which traces the star formation history of the universe from z... Dan Coe Instituto de Astrofísica de Andalucía - CSIC |
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09/02/2006 - 13:00
Radio mix El enorme dinamismo científico del IAA-CSIC es la causa de que esta charla, pensada para impartirse allá por Marzo-Abril de 2005, se haya ido retrasando hasta la fecha. Como consecuencia, la charla, que inicialmente iba a versar sobre los resultados obtenidos para la supernova SN2001gd en NGC 5033 (D~13 Mpc) a partir de datos radio y de rayos X, también incluye ahora otros dos resultados: La posible existencia de una fábrica de supernovas en la... Miguel Ángel Pérez Torres Instituto de Astrofísica de Andalucía - CSIC |
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03/02/2006 - 13:00
Modeling the Martian ozone layer Ozone (O3) is the most reactive species measured in the Martian atmosphere. Since the first modeling studies carried out in the early 1970s, it has been known that the abundance of ozone on Mars is tightly controlled by the hydrogen radicals produced by the photolysis and oxidation of water vapor. Thus, ozone is a sensitive tracer of the hydrogen photochemistry that stabilizes the Mars CO2 atmosphere. It also provides important information on... Franck Lefèvre Service d'Aéronomie & Instituto de Astrofísica de Andalucía - CSIC |
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01/02/2006 - 13:00
TBD Tbd Miguel Cerviño Instituto de Astrofísica de Andalucía - CSIC |
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26/01/2006 - 13:00
Dos sorpresas astronómicas Hablaré de dos proyectos independientes y que por diferentes motivos han producido (o han partido de) resultados sorprendentes. Se trata de dos galaxias con fuertes líneas de emisión, de naturaleza, ambiente y épocas muy distintos: una radio galaxia con corrimiento al rojo z=0.23 y una galaxia HII a z=3.6. Los resultados se han obtenido a partir de datos espectrocópicos muy profundos que han revelado en el primer caso estructuras gaseosas antes... Montserrat Villar Martín Instituto de Astrofísica de Andalucía - CSIC |
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19/01/2006 - 13:00
Marzo 2006, ¿una nueva fecha límite? Instrumentos en el Observatorio Europeo Austral En vista de la proximidad del anuncio del acuerdo definitivo para la entrada de España en ESO y de la posibilidad que se nos abre a los astrofísicos españoles de poder solicitar tiempo en los telescopios del ESO en Chile, me propongo hacer un rápido repaso de los instrumentos disponibles en el observatorio de La Silla Paranal. Para que luego no digáis que no avisé, en este seminario no os voy a tocar (el) ALMA (del que muchos de vosotros sabéis... Pedro Amado Instituto de Astrofísica de Andalucía - CSIC |
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11/01/2006 - 13:00
TBD Tbd Eduardo Sánchez Sastre Instituto de Astrofísica de Andalucía - CSIC |
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20/12/2005 - 13:00
Latest results on Anomalous Microwave Emission from the COSMOSOMAS Experiment In the last few years, there is increasing evidence of a new process of microwave emission in our Galaxy, different from the classical processes of free-free, synchrotron and (thermal) dust emission. In this talk I will review the progress made by the IAC CMB group in the study of this new process using the COSMOSOMAS experiment. With this instrument, we have found direct evidence of anomalous emission in the Perseus molecular cloud. In addition... José Alberto Rubiño-Martín Instituto de Astrofísica de Canarias (IAC) |
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16/12/2005 - 13:00
Prestaciones científicas medidas en laboratorio del instrumento Elmer para el GTC Elmer es un espectrógrafo y cámara óptico que ha sido construido para el GTC. Elmer está completamente integrado y en una fase intensiva de pruebas en laboratorio. El objeto de las mismas es caracterizar las prestaciones científicas en todos los modos de observación, preparar las estrategias de observación y optimizar el plan de calibración y reducción de datos. En esta charla se presentan los resultados de las pruebas en los modos de Imagen y... María Luisa García Vargas Instituto de Astrofísica de Canarias (IAC) |
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15/12/2005 - 13:00
On the feedback from super stellar clusters: The structure of giant HII regions and HII galaxies We review the structural properties of giant extragalactic HII regions and HII galaxies based on two dimensional hydrodynamic calculations, and propose an evolutionary sequence that accounts for their observed detailed structure. The model assumes a massive and young stellar cluster surrounded by a large collection of clouds. These are thus exposed to the most important star-formation feedback mechanisms: photoionization and the cluster wind.... Guillermo Tenorio-Tagle Instituto de Astrofísica de Andalucía - CSIC & INAOE |
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02/12/2005 - 13:00
Estado térmico de la corteza de hielo de Europa La superficie de Europa presenta una amplia variedad de terrenos y estructuras geológicas, incluyendo llanuras densamente fracturadas, cruzadas por numerosas crestas, artesas y bandas, y áreas de aspecto caótico donde las llanuras han sido literalmente rotas y donde es frecuente observar bloques aislados y desplazados, que recuerdan iceberg. Además, existen fuertes evidencias a favor de la existencia de un océano interno bajo la corteza de hielo... Javier Ruiz Universidad Complutense de Madrid |
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30/11/2005 - 13:00
La electrónica y el software de control del instrumento IMaX en la misión SUNRISE El Imaging Magnetograph eXperiment es parte de la carga útil del proyecto del globo de larga duración SUNRISE, que tendrá un vuelo sobre el Ártico o la Antártida en el 2009. Estudiará los campos magnéticos solares con alta resolución espacial y espectral, midiendo los estados de polarización dentro de una línea seleccionada. Para ello irá dotado de unos dispositivos polarizadores basados en cristales líquidos y de un filtro sintonizable basado... Antonio López Jiménez, Julio Rodríguez & Rafael Morales Instituto de Astrofísica de Andalucía - CSIC |
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25/11/2005 - 13:00
Abundance Derivations from Solar and Stellar Optical and Ultraviolet Spectra We show and describe the extent to which spectral calculations match observed high-resolution spectra of standard stars. From such matches, elemental abundance ratios derived for metal-poor stars are now providing a look at the early nucleosynthesis history of the Galaxy. The age and metallicity of extragalactic globular clusters are being constrained by comparing their observed spectra to theoretical stellar spectra that are constructed by... Ruth Peterson University of Califormia at Santa Cruz |
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24/11/2005 - 13:00
Following the Trail of the Magnetic Field from the Solar Interior Through the Heliosphere The past decade has seen a wealth of new data from ground and space based Solar observatories. 24/7 monitoring of the full Sun has allowed helioseismologists to determine the temperature, density, equation of state of the solar interior, and velocity structure of the solar interior with high precision. Using tomographic techniques the subsurface layers and the magnetic structures on the backside of the Sun can be imaged. New adaptive mirrors and... Alan Title Stanford-Lockheed Institute for Space Research, Palo Alto, CA |
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22/11/2005 - 13:00
Gas and Dust in Galaxies and Quasars at High redshift The study of the molecular gas in quasars and submillimeter galaxies at high redshift has significantly progressed during the last few years. From the current detection of CO emission in 38 sources spanning a range in redshift from 1<z<6.4 with, in some cases, the measurement of a series of CO rotational transitions, it is possible to constrain the physical conditions of the massive (>= 10^10 Msol) reservoirs of gas in these objects.... Pierre Cox IRAM (Grenoble) |
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10/11/2005 - 13:00
Modeling of Morphology, Composition and Light Scattering Properties of Microscopic Individual Particles in Cometary Coma Cometary dust environment modeling is an essential tool for the planning of the future operations and the data evaluation of Rosetta and other missions towards comets. Observational and laboratory data indicate that dust particles from comets have an irregular structure and are composed mainly by fine mixtures of organic and silicate components, but the real nature of cometary dust is still elusive. Here we present our investigation about the... Ivano Bertini Physikalisches Institut, Bern, Switzerland |
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03/11/2005 - 13:00
3D Continuum Radiative Transfer: An adaptive grid construction algorithm based on the Monte Carlo method. The continuum radiative transfer is a common problem in astrophysics that must be solved to describe the physics and interpret observations of objects embedded for instance in a dusty medium. The high angular resolution of present ground-based and space instruments reveal or are expected to reveal complex structures and geometries in astrophysical objects. It is thus necessary to take into account the three spatial dimensions. We chose the Monte... Gilles Niccolini Observatorio Astronómico Nacional (Madrid) |
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27/10/2005 - 14:00
Propiedades Cinemáticas y Físicas de Nebulosas Planetarias Evolucionadas En los últimos años hemos recopilado datos de un conjunto de nebulosas planetarias (NP) cuyas propiedades indican que se encuentran en un estado evolutivo avanzado. En el estudio que desarrollamos sobre estos objetos tratamos de inferir los procesos físicos involucrados en la formación de las nebulosas, con el fin de determinar si son los mismos procesos que actúan en las nebulosas planetarias más jóvenes, o si se pueden identificar otros que... Sandra Ayala Instituto de Astrofísica de Andalucía - CSIC |
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20/10/2005 - 14:00
Observaciones de Objetos Jóvenes, Nebulosas Planetarias y AGNs en la Estación Espacial de Robledo La antena de 70m de la estación espacial de NASA en Robledo de Chavela se utiliza regularmente para realizar observaciones de líneas moleculares en 1cm. En este rango, es uno de los radiotelescopios más sensibles del mundo. En esta charla presentaremos las características observacionales de la antena y los proyectos instrumentales futuros. Así mismo, expondremos los resultados de varias búsquedas sistemáticas de emisión máser de agua en... José Francisco Gómez Instituto de Astrofísica de Andalucía - CSIC |
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10/10/2005 - 14:00
The Virtual Observatory: A general Overview Over the past four years, a collaboration of data centers and universities in the United States has been working in conjunction with international partners worldwide to build the framework for the Virtual Observatory. This work is now coming to fruition with the release of science applications software and toolkits, and initial VO-enabled research results are appearing in the peer-reviewed journals and conference proceedings. I will describe the... Robert Hanisch National Virtual Observatory Project Manager, Space Telescope Science Institute |
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06/10/2005 - 14:00
La Galaxia Enana de Canis Major: ¿Canibalismo Galáctico en el Disco de la Vía Láctea? La teoría cosmológica de la Materia Oscura Fría ("Cold Dark Matter") predice que las galaxias similares a la Vía Láctea se formaron a partir de la destrucción por marea y posterior aglutinamiento de un gran número de fragmentos de baja masa parecidos a las galaxias enanas que observamos en el presente. Los restos de estas galaxias satélites pueden observarse en la actualidad en forma de largas corrientes de marea o sub-estructura... David Martínez-Delgado Instituto de Astrofísica de Andalucía - CSIC |
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28/09/2005 - 13:00
IDL: La Plataforma de Referencia para el Análisis y la Visualización Científica I. Nuevas tecnologías disponible en IDL para soluciones potentes e integradas: Introducción a las Itools, utilidades interactivas para el análisis y la visualización de datos. Nuevos formatos soportados: JPEG 2000, XML y HDF5 Nuevas técnicas de enlace en lenguajes externos: Puente IDL-Java, tecnolocía COM. II. IDL 6.2 disponible! Presentación y demos de las principales novedades. Visualización "objeto... Amelie Bentz & Imanol Echave RSI |
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27/09/2005 - 14:00
La Distribución de Separaciones de las Estrellas Dobles y Múltiples: Cosmogonia y Evolución Dinámica La distribución de separaciones de las componentes de estrellas dobles y múltiples contiene importante información sobre las condiciones existentes durante la formación estelar y la posterior evolución dinámica de los parámetros orbitales. De particular interés es la distribución de las separaciones (semieje mayor) de binarias abiertas (a > 40-60 AU) que refleja la acción de la perturbación gravitacional producida por otros miembros del... Arcadio Poveda Instituto de Astronomía, Universidad Nacional Autónoma de México |
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22/09/2005 - 14:00
The Sloan Digital Sky Survey: Services and Databases The Sloan Digital Sky Survey (SDSS) will map one-quarter of the entire sky and perform a redshift survey of galaxies, quasars and stars. The SDSS Catalog Archive Server (CAS) offers efficient search tools for querying the imaging and spectra catalogs. I will talk about the CAS and associated databases and services to access and explore the catalog data. María A. Nieto Santisteban Johns Hopkins University |
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20/07/2005 - 14:00
Cluster Evolution Since z~1 We have used the Advanced Camera for Surveys (ACS) on the HST to obtain optical imaging of a sample of 7 galaxy clusters in the redshift range 0.8<z<1.3. The ACS data provides accurate photometry and the ACS high angular resolution makes it possible to obtain crucial morphological information of the cluster galaxy populations. These data are supported by X-ray observations and by ground based imaging and multi-object spectroscopy. I will... Ricardo Demarco Johns Hopkins University, USA |
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14/07/2005 - 14:00
Rotation Curves of Disk Galaxies at Low and High Redshift We present results and progress notes from an investigation into the rotation curves of spiral galaxies at high and low redshift. We discuss work done with data from the DEEP2 (Deep Extragalacitc Evolutionary Probe) spectroscopic survey, which is a major effort to characterize galaxies at z~1. A distinct advantage of this survey is the relatively high spatial and spectral resolution of the data, which allows us to measure spatially-resolved... Susan Kassin Universidad de California, Santa Cruz, USA |
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08/07/2005 - 14:00
Asteroid families Asteroid families are the remnants of catastrophic collisions between asteroids and, so, we should expect a sort of mineralogical coherence among its members. While the dynamics helps us defining the groupings in the space of proper elements, the analysis of the reflectance spectra is currently the main tool to assess the surface mineralogy of asteroids. This kind of information could provide us with information about asteroid interiors,... Thais Mothé-Diniz Observatorio de París |
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01/07/2005 - 14:00
Black hole growth: accretion, AGN feedback and black hole mergers The evolution of a galaxy and its nuclear black hole is now widely thought to be co-eval. The coupling of black hole growth with galaxy evolution is therefore of great interest. This talk will address parts of this issue of black hole growth with emphasis on black hole growth via low-luminosity accretion in "normal" galaxies, AGN feedback as a regulator of black hole mass, and black hole mass growth by accretion vs. black hole mergers... Neil Nagar Universidad de Concepción, Chile |
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30/06/2005 - 14:00
El Rol de las Resonancias en Galaxias Barradas La fracción de galaxias barradas ha crecido enormemente en las últimas décadas. Actualmente, las estructuras barradas (barras u óvalos) no deben tratarse como una rareza o una pecularidad que exhiben algunas galaxias. En cambio, las barras dominan la dinámica de la zona interna del disco de muchas galaxias. Las resonancias dinámicas juegan un papel importante en este escenario. Estas resonancias aparecen cuando existe un fuerte acoplo... Daniel Ceverino New Mexico State University, USA |
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24/06/2005 - 14:00
Reporte sobre el Congreso 'Communicating Astronomy with the Public' En esta charla se dará un informe del congreso "Communicating Astronomy with the Public", organizado por ESA, ESO e IAU en Munich, que tocará entre otros los siguientes puntos: La comunicación según distintos enfoques: visitas virtuales a los observatorios, el papel de los planetarios, la educación astronómica en las escuelas, la astronomía en el cine y la música, y mucho más... Astronomía y astrología Iniciativas... Valentina Luridiana Instituto de Astrofísica de Andalucía - CSIC |
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23/06/2005 - 14:00
Inequalities for Relativistic Embeddings in non-compact Kaluza-Klein Theories In recent years there has been a growing interest in the study of space-times embedded in some higher-dimensional space (see e.g. brane models, induced matter theory, ...). In induced matter theory for example, a space-time is considered to be a hypersurface in a five-dimensional space with vanishing Ricci tensor, such that the fifth variable, i.e. a matter coordinate, is constant on the hypersurface. The theory however provides no way to obtain... Stefan Haesen Dept. of Mathematics, Katholieke Universiteit Leuven |
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16/06/2005 - 14:00
Optical afterglow observations of gamma-ray bursts Optical afterglows of GRBs provide vital information about the nature of the progenitors and the energetics. Observed achromatic steepening in several optical afterglow light-curves show evidence for the presence of the jet-break, constraining the total output energy. Intrinsic values of spectral indices also indicate towards considerable host galaxy extinction in a few GRBs. Superposed variability in the observed afterglow light curves indicate... Shashi B. Pandey Aryabhatta Research Institute of observational SceincES, ARIES, Nainital, India |
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09/06/2005 - 14:00
Universe-The Cosmology Quest, Part. II Previews of both parts of this DVD can be seen at www.universe-film.com. It can be thought of as the "inelegant universe" response to the recently shown "Elegant Universe" film that glorifies the standard model. It is a well constructed two part film that benefitted from a collaboration with Walter Murch a Hollywood film editor who works with F. Coppola among others and who has more than a dozen academy awards to his credit.... J. Sulentic Department of Physics and Astronomy, University of Alabama, USA |
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08/06/2005 - 14:00
Universe-The Cosmology Quest, Part. I Previews of both parts of this DVD can be seen at www.universe-film.com. It can be thought of as the "inelegant universe" response to the recently shown "Elegant Universe" film that glorifies the standard model. It is a well constructed two part film that benefitted from a collaboration with Walter Murch a Hollywood film editor who works with F. Coppola among others and who has more than a dozen academy awards to his credit.... J. Sulentic Department of Physics and Astronomy, University of Alabama, USA |
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02/06/2005 - 14:00
The New Era in Stellar Population Synthesis: Methods & 50362 Applications The study of the stellar content of distant galaxies has a long and venerable history but, at the same time, something of a 'bad reputation' due to the numerous problems associated with dificulties in disentagling age, metallicity and extinction effects. I'll discuss recent developments in the field. In particular, I'll show how modeling the full spectrum (instead of a handfull of "pet" indices,as I and many others did in the past)... Roberto Cid Fernandes Depto. de Fisica, Universidade Federal de Santa Catarina, Florianopolis, Brasil |
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30/05/2005 - 14:00
Low Surface Brightness Galaxies with the Sloan Digital Sky Survey I will briefly review my research interest on Low Surface Brightness Galaxies (LSBGs). I will show the latest results from our survey for LSBGs with the Sloan Digital Sky Survey (SDSS) data. I used SDSS imaging data to establish a sample of all galaxies with radii >12 arcsec and a limiting surface brightness in g=26.5 mag/sq.arcsec within an area of 228 sq.deg using my own detection and analysis software. For all found galaxies (~5500) the... Alexei Kniazev ESO/MPIA |
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24/05/2005 - 14:00
Resumen del curso de comunicación científica COMCIENCIA05 Enrique, Valentina y Miguel Ángel nos presentarán un resumen (¡prometen que no será de más de 25 minutos!) de COMCIENCIA05, un curso de formación para científicios al que asistieron del 11 al 3 de Mayo, en Barcelona. El curso presentaba las herramientas necesarias para lograr una comunicación eficaz. La metodología usada se basaba en casos prácticos protagonizados por agentes de la comunicación de la ciencia con los que se encuentra el... Enrique, Valentina y Miguel Ángel Instituto de Astrofísica de Andalucía - CSIC |
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23/05/2005 - 14:00
Nanodiamantes y el Quiebre en la Distribución de Energía de Quasares The quasar spectral energy distribution (SED) in the UV is characterized by a sharp break near 1000 A. The SED (in Fnu) of quasars can be described by a broken powerlaw. Telfer et al. 2002 showed, using a composite quasar spectrum, that the powerlaw index changes from -0.6 in the near UV (longward of 1000 A) to -1.7 in the far-UV. This means that the quasar SED is very soft, which complicates the modeling of the high excitation emission lines... Luc Binette UNAM, México |
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19/05/2005 - 14:00
Solar coronal heating and photospheric magnetic field The solar coronal heating is one of the most important problem to be solved for the astrophysics. Although it is widely accepted that the magnetic filed emerging from the solar surface plays an essential role for the coronal heating, the detailed mechanism is totally unknown. In this study, we investigated the relationship between the coronal temperature distribution and the properties of small scale magnetic features, magnetic flux tubes, at... Shin'ichi Nagata Kwasan and Hida Observatories/Kyoto Univ., Japan |
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11/05/2005 - 14:00
Galaxy Morphology Near and Far: Machine-Automated Approaches I will discuss recent efforts to assemble and analyse a multi-band (UBVRIJH) galaxy image library for the purpose of quantifying the structural properties of nearby and distant galaxies. We wish to study the evolutionary changes in galaxy morphology by combining data from modern space-based instruments with new quantitive methods of image analysis. Using new Fourier-based automated surface photometry methods (Odewahn 2002) along with pattern... Steve Odewahn University of Texas, USA |
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28/04/2005 - 14:00
Fractales y Nubes Interestelares Definitivamente las nubes interestelares no son esféricas (ni cúbicas!). Su complejidad es difícil de modelar basados en cualquier figura geométrica simple. Parece ser que los objetos fractales son "mejores" para describir algunas de las propiedades que se observan en los grandes complejos de nubes moleculares (y en muchos otros fenómenos naturales). Describiremos brevemente las propiedades de los fractales, y como éstos pueden ser... Néstor Sánchez Departamento de Física, Universidad del Zulia, Venezuela |
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21/04/2005 - 14:00
Propiedades de los Objetos Colapsados Los sistemas "virializados" de partículas que interactúan sólo gravitatoriamente tienen perfiles de densidad y velocidad bien definidos que se extienden hasta varios radios viriales. Se discute la posibilidad de explicar estos perfiles a distancias suficientemente grandes del centro mediante la combinación de la estadística del campo inicial de fluctuaciones con el modelo de colapso esférico estándar. También se considerará la... Juan Betancort Instituto de Astrofísica de Canarias (IAC) |
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12/04/2005 - 19:00
The legacy of the first stars The end products of the life of the first stars in the Galaxy are preserved in the most metal-poor stars we see today. A Large Programme of high-resolution spectroscopy at the ESO VLT has enabled us to study the compositon of such stars in unprecedented detail. The results shed new light on both the structure of the first SNe II, the first synthesis of the heavy elements, and the early chemical evolution of the Galaxy. Johannes Andersen Director of the Nordic Optical Telescope, NOT |
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12/04/2005 - 14:00
The Nordic Optical Telescope: Present and Future The Nordic Optical Telescope (NOT) has now been in successful operation on La Palma for 15 years. Great changes have taken place in Nordic and European astronomy during that time. Notably, ESO has commissioned the VLT, to which most Nordic astronomers now have access. NOT is also a partner in OPTICON, which is broadening the scope of European cooperation in optical/IR astronomy. Accordingly, the instrumentation and mode of operation of NOT are... Johannes Andersen Director of the Nordic Optical Telescope, NOT |
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07/04/2005 - 14:15
Astrophysical Bounds on Planck Suppressed Lorentz Violations It is generally believed that Lorentz invariance is an exact symmetry of Nature. Together with the equivalence principle, local Lorentz invariance is one of the assumptions underpinning General Relativity. Several predictions from quantum gravity models have put in question the validity of Lorentz invariance at scales near the Planckian one. A major realization of recent years is that such violations/modifications of Lorentz invariance at high... Stefano Liberati SISSA, Trieste, Italy |
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30/03/2005 - 14:00
The Spanish Virtual Observatory Although astronomical archives constitute a basic tool for modern Astrophysics as revealed by their intensive usage (in particular for multiwavelength astronomy), it is also true that the efficiency in the scientific exploitation of the available information is seriously limited by two major facts. Archives lack of a real interoperability among them. Methodological bottlenecks: The "classical" methods of retrieving and... Enrique Solano Laboratorio de Astrofísica Espacial y Física Fundamental, INTA |