Physics
Scientific paper
Apr 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aps..apr.k1105e&link_type=abstract
American Physical Society, APS/AAPT Joint Meeting, April 18-21, 1997, abstract #K11.05
Physics
1
Scientific paper
The solar potential perturbs light propagating in the solar system, providing the basis for tests of gravity through Very Long Baseline Interferometry (VLBI) observations of radio waves from extragalactic radio sources. Such observations determine the γ parameter of the Parameterized Post Newtonian (PPN) expansion of the spacetime metric, with the effect being largest for raypaths close to the Sun. The determination of γ is currently improving rapidly, both due to improvements in the VLBI state-of-the-art, and the current ``quiet'' stage of the solar cycle, which facilitates observations of sources angularly close to the Sun. The VLBI data can be combined with recent estimates of the Nordtvedt parameter using Lunar Laser Ranging and determinations of the perihelion precession of Mercury to estimate both the PPN γ and β parameters, yielding γ = 0.99994 ± 0.00031 and β = 0.99981 ± 0.00026, together with a solar J2 estimate of (-1.8 ± 4.5) \cdot 10-7. These data are thus consistent with General Relativity at the level of ~3 parts in 10^4 (one standard error).
Archinal Brent A.
Eubanks Thomas Marshall
Klioner Sergei A.
Martin James O.
Matsakis Demetrios N.
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