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Proceedings Paper

Gravitation Astrometric Measurement Experiment (GAME)
Author(s): M. Gai; A. Vecchiato; S. Ligori; A. Riva; M. G. Lattanzi; D. Busonero; A. Fienga; D. Loreggia; M. T. Crosta
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Paper Abstract

GAME is a recent concept for a small/medium class mission aimed at Fundamental Physics tests in the Solar system, by means of an optimised instrument in the visible, based on smart combination of coronagraphy and Fizeau interferometry. The targeted precision on the γ and β parameters of the Parametrised Post-Newtonian formulation of General Relativity are respectively in the 10-7-10-8 and 10-5-10-6 range, improving by one or two orders of magnitude with respect to the expectations on current or near future experiments. Such precision is suitable to detect possible deviations from the unity value, associated to generalised Einstein models for gravitation, with potentially huge impacts on the cosmological distribution of dark matter and dark energy from a Solar system scale experiment. The measurement principle is based on the differential astrometric signature on the stellar positions, i.e. based on the spatial component of the effect rather than the temporal component as in the most recent experiments using radio link delay timing variation (Cassini). The instrument concept is based on multiple field, multiple aperture Fizeau interferometry, observing simultaneously regions close to the Solar limb (requiring the adoption of coronagraphic techniques), and others in opposition to the Sun. The diluted optics approach is selected for achieving an efficient rejection of the scattered solar radiation, while retaining an acceptable angular resolution on the science targets. The multiple field observation is aimed at cost-effective control of systematic effects through simultaneous calibration. We describe the science motivation, the proposed mission profile, the instrument concept and the expected performance.

Paper Details

Date Published: 12 September 2012
PDF: 9 pages
Proc. SPIE 8445, Optical and Infrared Interferometry III, 844513 (12 September 2012); doi: 10.1117/12.926875
Show Author Affiliations
M. Gai, INAF - Osservatorio Astronomico di Torino (Italy)
A. Vecchiato, INAF - Osservatorio Astronomico di Torino (Italy)
S. Ligori, INAF - Osservatorio Astronomico di Torino (Italy)
A. Riva, INAF - Osservatorio Astronomico di Torino (Italy)
M. G. Lattanzi, INAF - Osservatorio Astronomico di Torino (Italy)
D. Busonero, INAF - Osservatorio Astronomico di Torino (Italy)
A. Fienga, Univ. de Franche-Comté (France)
D. Loreggia, INAF - Osservatorio Astronomico di Torino (Italy)
M. T. Crosta, INAF - Osservatorio Astronomico di Torino (Italy)

Published in SPIE Proceedings Vol. 8445:
Optical and Infrared Interferometry III
Françoise Delplancke; Jayadev K. Rajagopal; Fabien Malbet, Editor(s)

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