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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 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

The best place and time to live in the Milky Way

Mar 05, 2021

The best place and time to live in the Milky Way More than 6 billion years ago, the outskirts of the Milky Way were the safest places for the development of possible life forms, sheltered from the most violent explosions in the universe: gamma-ray bursts and supernovae. This is demonstrated by a new study, led by researchers from INAF and the University of Insubria in Italy, which investigates the incidence of these events throughout the evolution of our galaxy

Magnetic anomalies on the young craters of Mercury

Feb 24, 2021

Magnetic anomalies on the young craters of Mercury It is possible to find a point of convergence between geophysics and planetary geology, and a group of researchers led by Valentina Galluzzi from INAF did so by analyzing the crustal magnetic field of the planet Mercury, focusing on some anomalies identified nearby two recently formed craters