Gravity Probe Spin

Derek Jackson Kimball, Pavel Fadeev, Tao Wang, Alexander Sushkov, Yehuda Band, Peter Graham, Dmitry Budker

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


Under conditions where the total angular momentum of a ferromagnet is dominated by its intrinsic spin, the ferromagnet is predicted to behave as a gyroscope. If such a ferromagnetic gyroscope (FG) can be sufficiently isolated from the environment, it has the potential to measure spin-dependent interactions with a sensitivity far surpassing that of other systems. The high sensitivity is the result of rapid averaging of quantum noise. We propose to use a mm-scale FG in orbit around the Earth to investigate physics at the intersection between quantum mechanics and general relativity by measuring relativistic frame dragging (the Lense-Thirring effect) with intrinsic spin. The behavior of intrinsic spin in spacetime dragged by a massive rotating body is an experimentally open question, hence the results of such a measurement may have important theoretical consequences. This work was supported by the Moore Foundation, the Heising-Simons Foundation, and the National Science Foundation under Grant PHY-1707875.
Original languageEnglish
Title of host publication APS Division of Atomic and Molecular Physics Meeting 2020
StatePublished - 2020


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