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16 April 2024

» arxiv » gr-qc/0506104

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Fundamental Physics with the Laser Astrometric Test Of Relativity
LATOR Collaboration: S.G. Turyshev ; H. Dittus ; M. Shao ; K.L. Nordtvedt ; Jr. ; C. Laemmerzahl ; S. Theil ; W. Ertmer ; E. Rasel ; R. Foerstner ; U. Johann ; S. Klioner ; M. Soffel ; B. Dachwald ; W. Seboldt ; V. Perlick ; M.C.W. Sandford ; R. Bingham ; B. Kent ; T.J. Sumner ; O. Bertolami ; J.Paramos ; B. Christophe ; B. Foulon ; P. Touboul ; P. Bouyer ; T. Damour ; S. Reynaud ; C. Salomon ; A. Brillet ; F. Bondu ; J.-F. Mangin ; E. Samain ; C. Erd ; J.C. Grenouilleau ; D. Izzo ; A. Rathke ; S.W. Asmar ; M. Colavita ; Y. Gursel ; et al ;
Date:	21 Jun 2005
Subject:	gr-qc
Abstract:	The Laser Astrometric Test Of Relativity (LATOR) is a joint European-U.S. Michelson-Morley-type experiment designed to test the pure tensor metric nature of gravitation - a fundamental postulate of Einstein’s theory of general relativity. By using a combination of independent time-series of highly accurate gravitational deflection of light in the immediate proximity to the Sun, along with measurements of the Shapiro time delay on interplanetary scales (to a precision respectively better than 0.1 picoradians and 1 cm), LATOR will significantly improve our knowledge of relativistic gravity. The primary mission objective is to i) measure the key post-Newtonian Eddington parameter gamma with accuracy of a part in 10^9. (1-gamma) is a direct measure for presence of a new interaction in gravitational theory, and, in its search, LATOR goes a factor 30,000 beyond the present best result, Cassini’s 2003 test. The mission will also provide: ii) first measurement of gravity’s non-linear effects on light to ~0.01% accuracy; including both the Eddington eta parameter and also the spatial metric’s 2nd order potential contribution (never measured before); iii) direct measurement of the solar quadrupole moment J2 (currently unavailable) to accuracy of a part in 200 of its expected size; iv) direct measurement of the "frame-dragging" effect on light by the Sun’s gravitomagnetic field, to 1% accuracy. LATOR’s primary measurement pushes to unprecedented accuracy the search for cosmologically relevant scalar-tensor theories of gravity by looking for a remnant scalar field in today’s solar system. We discuss the mission design of this proposed experiment.
Source:	arXiv, gr-qc/0506104
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