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Archivio mensile: Luglio 2013

Did the Milky Way and Andromeda already collide?

Gli scienziati ritengono che tra circa 3 miliardi di anni la Via Lattea si scontrerà con Andromeda e che tale evento sarà il primo di una serie di collisioni galattiche. Oggi, però, un gruppo di astronomi guidati da Hongsheng Zhao della University of St Andrews propone un nuovo scenario in cui viene ipotizzato che le due…

Protostars and Planets

Protostars and Planets

The Protostars and Planets series for more than two decades has served the community with state of the art compilations of the current knowledge in the fields of star and planet formation. The previous volume PPV is published in 2007, but the contents is based on the year of the corresponding conference in 2005 in…

Probes of Dark Matter on Galaxy Scales

Probes of Dark Matter on Galaxy Scales

The goal of this meeting is to bring together international experts who work on probes of dark matter on galactic scales — on Dynamical studies (utilizing new simulations as well as new observational data), Gravitational Lensing, Kinematical studies of Dwarf Galaxies in the Local Group and beyond, and Direct and Indirect searches for Dark Matter.  A key aspect of…

G191-B2B, a stellar test on a constant of nature

Un gruppo di fisici della University of New South Wales (UNSW) hanno studiato una nana bianca distante dove la gravità diventa oltre 30.000 volte maggiore rispetto alla superficie terrestre per verificare una teoria controversa sulla variabilità, o meno, di una delle costanti della natura. Julian Berengut and his international team used the Hubble Space Telescope…

Varying fundamental constants and dynamical dark energy

Varying fundamental constants and dynamical dark energy

The behaviour of physical fundamental constants is an effective way to probe fundamental physics and cosmological models. The fine-structure constant α and the proton-to-electron mass ratio µ can be studied with a range of physical observables across the Universe, including  spectra of the more distant quasars, Cosmic Microwave Background and Primordial Nucleosynthesis. A connection between…