Astrophysical influences in Balance based G experiments

Details Astrophysical influences in Balance based G experiments Astrophysical influences in Balance based G experiments

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aps..apr.u6014y&link_type=abstract

American Physical Society, April Meeting, 2003, April 5-8, 2003 Philadelphia, Pennsylvania, MEETING ID: APR03, abstract #U6.014

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In many gravitational experiments a balance is employed. Balances are one of most precise, commodity instruments manufactured and permit sensitive weight measurements, avoiding difficulties arising from non-linear effects of a torsion fiber. However, balances have to contend with the local background, g(r,t). Astrophysical influences uncontrollably change g and the equilibrium of a balance is affected. Over a long period, our data for delta[W(t)], the relative variation in the apparent weight of a test mass, clearly tracks the tides and in rather short time intervals steep changes (ppb/s)take place. Implications of our observations on the other [St. Schlamminger et al.,PRL 89,161102, 2002]work will be discussed.

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