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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.

Farewell to Giovanni Bignami

May 26, 2017

Farewell to Giovanni Bignami Great astrophysicist and former President of INAF and ASI, Bignami passed away suddenly while in Madrid where he was carrying out his research activities.

INAF researcher involved in the discovery of a millisecond pulsar

May 20, 2017

INAF researcher involved in the discovery of a millisecond pulsar An international team of astronomers led by Ivan Zolotukhin of the Institut de Recherche en Astrophysique et Planétologie (IRAP) of Toulouse, also including Matteo Bachetti, a researcher of the INAF in Cagliari, has discovered that this pulsar is at the beginning of the recycle phase, i.e. the process that causes slow and "turned-off” neutron stars to turn on again as “millisecond pulsar”.

Cassini Scientist for a Day: the competition for young scientists sets new records

May 20, 2017

Cassini Scientist for a Day: the competition for young scientists sets new records New record numbers for the 15th edition of Cassini Scientist for a Day, the international competition launched by NASA and promoted in Europe by the European Space Agency (ESA), open to lower and upper secondary school students. In Italy, 181 students participated in the competition, sending a total of 81 essays to a panel of researchers and experts in science communication.