Personal tools
Log in
You are here: Home Research Activities Relativistic and Particle Astrophysics Physics of gravitation and cosmology with high precision space astrometry

Physics of gravitation and cosmology with high precision space astrometry

The improvement of the precision in the verification of General Relativity (GR) is of crucial importance for fundamental physics, having a cosmological and astrophysical impact on all scales. In fact, the study of the evolution of the Universe covering a timescale of 60 orders of magnitude, from the primordial to the present, depends essentially on the understanding of gravitational interaction, most reliably interpreted through General Relativity. The most used theoretical instrument to compare these theories on a local scale is the parameterized post Newtonian (PPN), in which each theory is characterised by precise assumed values from a parameter set estimated from experiments. Amongst these parameters, , (related to the curvature of space-time induced by mass) is the most studied, and also the most accessible via astrometric measurements. The estimation of this parameter allows tight constraints to be placed also on alternative formalisms that can appreciably modify the current estimate of the mass/dark energy ratio. In this sense the measurement of the parameter can be considered a powerful cosmological test using local measurements.

It is predicted that the GAIA mission can reach an accuracy of 10-6 for at the 3-sigma level, for nominal performance, by measuring the temporal evolution of the positions of a billion objects all over the celestial sphere. The numerical verifications and the relevant parts of the code are under development under an Agenzia Spaziale Italiana contract, coordinated with the activity of the European consortium DPAC (Data Processing and Analysis Consortium) for the reduction of GAIA data.

Space, ASI’s Sardinia Deep Space Antenna inaugurated

Sep 09, 2017

Space, ASI’s Sardinia Deep Space Antenna inaugurated The SDSA is located at the Sardinia Radio Telescope-SRT: the large radio telescope for the study of the Universe, situated near Cagliari and developed by the National Institute for Astrophysics-INAF in collaboration with ASI, Regione Sardegna and the Ministry of Education, University and Research-MIUR.

Space, Let’s go to Mars

Sep 09, 2017

Space, Let’s go to Mars An educational video game to explore the Red Planet

Carina Nebula, INAF identifies new star formations

Sep 09, 2017

Carina Nebula, INAF identifies new star formations The Gaia-ESO Survey: Global properties of clusters Trumpler 14 and 16 in the Carina nebula study conducted by Francesco Damiani from INAF of Palermo, involving a number of researchers from the INAF observatories of Arcetri, Bologna, Catania, Padua and Palermo, has been recently published in Astronomy & Astrophysics.