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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.

Light in Astronomy 2017

Nov 14, 2017

Light in Astronomy 2017 Light in Astronomy, organized by INAF in collaboration with the Italian Astronomical Society-SAIt, will be a week (13-19 November) dedicated to satisfying curiosity about the Universe thanks to the opening in Italy of INAF premises, including the astronomical observatories.

Marsis radar reveals that on Mars all that echoes is not ice

Oct 28, 2017

Marsis radar reveals that on Mars all that echoes is not ice The low dielectric constant of the Meridiani Planum deposits is consistent with a thick layer of ice-free, porous, basaltic sand. This study is fundamental to identify techniques that may help find the planet’s areas with accessible water ice.

A 3D step towards sorting out the Gamma-Ray Bursts zoo

Oct 13, 2017

A 3D step towards sorting out the Gamma-Ray Bursts zoo A powerful tool for characterizing and classifying gamma-ray bursts (GRBs) to allow their use as tracers of the expansion history of the universe has recently been presented by an international team of researchers led by Dr. Maria Dainotti