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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.

GRB-SN Association within the Binary-Driven Hypernova Model

Sep 22, 2023

GRB-SN Association within the Binary-Driven Hypernova Model The GRB-SN association, probably the most constraining property of GRB theoretical models, is the subject of a new article by an ICRA-ICRANet collaboration, accepted for publication in The Astrophysical Journal

The polyhedric scientist and his sharp tones

Sep 08, 2023

Tomaso Belloni passed away suddenly on August 26th. He was a leading scientist of the Italian astrophysics community and was well known internationally for his work on compact objects in the X-ray and gamma-ray bands

Farewell Krakow, see you in Padua for EAS 2024

Jul 14, 2023

Farewell Krakow, see you in Padua for EAS 2024 The annual meeting of the European Astronomical Society (EAS) ended today in Krakow, Poland. Next year, Padua will host the annual EAS meeting from 1st to 5th July 2024