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Archivio mensile: Maggio 2014

Raggi gamma dal nucleo delle galassie attive

Tra le varie classi di nuclei galattici attivi, i blazar rappresentano gli oggetti più estremi. Una delle caratteristiche che contraddistingue questa particolare famiglia di galassie attive è data dalla presenza di getti di materia, allineati quasi lungo la linea di vista, che emergono dal nucleo centrale e che sono spesso accompagnati da una forte emissione…

Astronomical Polarimetry 2014

Astronomical Polarimetry 2014

ASTROPOL 2014 is the next of a series of large international conferences held regularly, every 5 years or so. The aim of this series of conferences is to bring together all researchers interested in astronomical polarimetry to discuss the most recent results and advances, technical and scientific. The previous ASTROPOL meetings were held in Baie…

The Extragalactic Distance Scale

The Extragalactic Distance Scale

MIAPP programmes last for four weeks and are organised by external and local coordinators on a topic in Astro, Particle and Nuclear Physics. The workshop programme typically consists of regular seminars, but leaves much time for collaborations and discussions between the participants in a casual, relaxed atmosphere.  MIAPP 2014

Statistical Challenges in 21° Century Cosmology

Statistical Challenges in 21° Century Cosmology

In the era of large astronomical surveys that are grappling with unsolved methodological and data challenges, transforming Data into Science is a huge, and exciting, problem. With surveys and instruments such as Planck, Pan-STARRS1, DES, VST KiDS, LSST, Gaia, EUCLID, JPAS, SKA, wide-field spectroscopic surveys and the large and interconnected databases of archival material coming online, a…

Dwarf Galaxies as Cosmological Probes

Dwarf Galaxies as Cosmological Probes

Recent wide-field surveys have revolutionized our understanding of the Local Group of Galaxies. The Sloan Digital Sky Survey, in particular, has more than doubled the number of known dwarf galaxies orbiting the Milky Way and revealed a new population of ultrafaint dwarf satellites. At the same time, advances in computational cosmology have led to improved…

Messaggi nel tempo attraverso lunghi cunicoli spazio-temporali

Secondo uno studio recente condotto da Luke Butcher dell'University of Cambridge, potrebbero esistere alcuni tipi di cunicoli spazio-temporali, i cosiddetti "wormhole" noti anche come ponti di Einstein-Rosen, in grado di rimanere "aperti" per un tempo tale che un fotone li possa attraversare. Questo fenomeno, dovuto ad una forma di energia negativa, detta energia Casimir, implicherebbe la…