Gravity Probe Spin: Prospects for measuring general-relativistic precession of intrinsic spin using a ferromagnetic gyroscope

• URL: http://arxiv.org/abs/2006.09334v1
• Date: Tue, 16 Jun 2020 17:18:44 GMT
• Title: Gravity Probe Spin: Prospects for measuring general-relativistic precession of intrinsic spin using a ferromagnetic gyroscope
• Authors: Pavel Fadeev, Tao Wang, Y. B. Band, Dmitry Budker, Peter W. Graham, Alexander O. Sushkov, and Derek F. Jackson Kimball
• Abstract summary: An experimental test at the intersection of quantum physics and general relativity is proposed. The behavior of intrinsic spin in spacetime is an experimentally open question. A measurement is possible by using mm-scale ferromagnetic gyroscopes in orbit around the Earth.
• Score: 51.51258642763384
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: An experimental test at the intersection of quantum physics and general relativity is proposed: measurement of relativistic frame dragging and geodetic precession using intrinsic spin of electrons. The behavior of intrinsic spin in spacetime dragged and warped by a massive rotating body is an experimentally open question, hence the results of such a measurement could have important theoretical consequences. Such a measurement is possible by using mm-scale ferromagnetic gyroscopes in orbit around the Earth. Under conditions where the rotational angular momentum of a ferromagnet is sufficiently small, a ferromagnet's angular momentum is dominated by atomic electron spins and is predicted to exhibit macroscopic gyroscopic behavior. If such a ferromagnetic gyroscope is sufficiently isolated from the environment, rapid averaging of quantum uncertainty via the spin-lattice interaction enables readout of the ferromagnetic gyroscope dynamics with sufficient sensitivity to measure both the Lense-Thirring (frame dragging) and de Sitter (geodetic precession) effects due to the Earth.

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