Journal
PHYSICS LETTERS A
Volume 372, Issue 5, Pages 547-552Publisher
ELSEVIER
DOI: 10.1016/j.physleta.2007.08.020
Keywords
torsion pendulum; torsional mode couplings; analytic solution
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The coupling of the swing modes of a torsion pendulum to the torsional mode has been solved analytically. Our solution provides a clear explanation of why a magnetic damper is effective in suppressing unwanted modes in most gravitational experiments. The analytic solution also shows that the amplitude of the mode coupling is greatest at the lowest frequencies. This explains why mode coupling at the lowest frequency is all that is observed in the experiments reported here. (c) 2007 Elsevier B.V. All rights reserved.
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