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dc.contributor.advisorHeckel, Blayne R
dc.contributor.advisorAdelberger, Eric G
dc.contributor.authorLee, John Greendeer
dc.date.accessioned2020-04-30T17:45:28Z
dc.date.available2020-04-30T17:45:28Z
dc.date.submitted2020
dc.identifier.otherLee_washington_0250E_21241.pdf
dc.identifier.urihttp://hdl.handle.net/1773/45542
dc.descriptionThesis (Ph.D.)--University of Washington, 2020
dc.description.abstractThis dissertation presents the latest E\"{o}t-Wash group test of the gravitiational Inverse Square Law (ISL) at the shortest possible distances using a stationary torsion pendulum above a rotating attractor. It largely builds off of earlier Fourier-Bessel work of Ted Cook \cite{cook2013test} that utilized test-masses with both 18-fold and 120-fold azimuthal symmetries. In this case, the effective masses of the platinum test bodies of the 18- and 120-fold patterns on the pendulum were 0.21 and 0.62 mg. We tested the ISL at separations ranging from 52$\mu$m to 3mm. We have excluded at 95\% confidence gravitational strength Yukawa interactions with length scales $\lambda > 39\mu$m and set new limits between $\lambda = 8\mu$m and $90\mu$m. We have resolved gravitational interactions at the closest separations ever and measured a new systematic arising from the magnetic susceptibilities of our test-mass materials. We present a full description of the instrument, the analysis methods, and the results.
dc.format.mimetypeapplication/pdf
dc.language.isoen_US
dc.rightsCC BY
dc.subjectdark energy
dc.subjectextra dimensions
dc.subjectgravity
dc.subjectinverse-square law
dc.subjectNewton
dc.subjecttorsion balance
dc.subjectPhysics
dc.subject.otherPhysics
dc.titleA Fourier-Bessel Test of the Gravitational Inverse-Square Law
dc.typeThesis
dc.embargo.termsOpen Access


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