Gravity Probe Spin: Prospects for measuring general-relativistic precession of intrinsic spin using a ferromagnetic gyroscope
Gravity Probe Spin: Prospects for measuring general-relativistic precession of intrinsic spin using a ferromagnetic gyroscope
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DOI：
10.1103/physrevd.103.044056
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发表时间：
2021-02-25
影响因子：
5
通讯作者：
Kimball, Derek F. Jackson
中科院分区：
文献类型：
--
作者：
Fadeev, Pavel;Wang, Tao;Kimball, Derek F. Jackson
本文提出了一个量子物理和广义相对论交叉点的实验测试：利用电子的内禀自旋测量相对论标架拖曳和测地岁差。在被大质量旋转体拖曳和扭曲的时空中，内禀自旋的行为是一个实验上的开放问题，因此这样的测量结果可能具有重要的理论意义。这种测量是可能的，通过使用毫米级的铁磁陀螺仪在轨道上围绕地球。在铁磁体的旋转角动量足够小的条件下，铁磁体的角动量由原子电子自旋主导，并被预测表现出宏观陀螺行为。如果这样的铁磁陀螺仪与环境充分隔离，则通过自旋-晶格相互作用对量子不确定性进行快速平均使得能够以足够的灵敏度读出铁磁陀螺仪动力学，以测量由于地球引起的Lense-Thirring（框架拖曳）和de Sitter（大地进动）效应。
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.