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The large scale structure of the universe

The large scale distribution of matter provides one of the principal observables for testing the cosmological model. The inhomogeneity of the distribution of galaxies and dark matter, the dependence of this on the scale, and its time evolution, depend critically on the parameter values of the model. The combination of measurements of the expansion rate of the Universe with those of the rate of growth of density fluctuations, allow, in principle, the basis of the theory to be tested, and also provide a verification of the theory of General Relativity. In fact, there exists the fascinating possibility that dark energy is a manifestation of a modified gravity, that is, a deviation from the Einstein equations. This is currently one of the alternatives to dark energy most actively explored. Along with observation of the cosmic microwave background, the quantitative characterisation of the large scale structure of the Universe via redshift surveys of galaxies and clusters and weak lensing measurements are surely the methods that promise the best results in this field, thanks to the large surveys either underway or planned.

The long journey of human missions to Mars and back to Earth

Aug 09, 2021

The long journey of human missions to Mars and back to Earth The Embassy of Italy, in collaboration with the Italian Cultural Institute in Sydney and the Australian Academy of Science, invites you to an Italian Night with Five Southern Stars!

Gaia draws a new map of the galactic spirals

Jul 28, 2021

Gaia draws a new map of the galactic spirals An international team led by researchers of the the Italian National Institute for Astrophysics (INAF) has compiled the most detailed map yet of the Milky Way’s spiral structure within about 16,000 light years from the Sun, by making use of the position and brightness of around 600,000 young stars measured by Gaia, the European Space Agency’s star surveyor

The morphology of the X-ray afterglows and of the jetted GeV emission in long gamma-ray bursts

May 12, 2021

The morphology of the X-ray afterglows and of the jetted GeV emission in long gamma-ray bursts In a new article published in the Monthly Notices of the Royal Astronomical Society, an ICRA-ICRANet research team (some of them INAF associates) sheds light on the mass and spin of stellar-mass BHs from an extensive analysis of long-duration GRBs