Astrophysical influences in Balance based G experiments

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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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