The isotropy of gravity from lunar laser ranging

Details The isotropy of gravity from lunar laser ranging The isotropy of gravity from lunar laser ranging

Jun 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996cqgra..13.1309n&link_type=abstract

Classical and Quantum Gravity, Volume 13, Issue 6, pp. 1309-1316 (1996).

Physics

6

Scientific paper

Laser ranging measurement of the lunar orbit (LLR) is examined for its ability to detect any spatial anisotropy in the gravitational interaction. Considering this possibility within the framework of energy - momentum-conserving generalizations of post-Newtonian metric gravity, it is found that the amplitude of an Earth - Moon range oscillation of frequency 0264-9381/13/6/005/img1 ( twice sidereal-anomalistic) is the system's most sensitive probe of any effective anistropy in gravity. Given the very significant improvement in precision of LLR data which has been achieved over the last decade, anisotropy of Newton's coupling parameter G at five parts in 0264-9381/13/6/005/img2 should be detectable with LLR. This is equivalent to measurement of the preferred frame PPN coefficient 0264-9381/13/6/005/img3 to two parts in 0264-9381/13/6/005/img4.

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