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Test of Lorentz invariance with spin precession of ultracold neutrons

Abstract : A clock comparison experiment, analyzing the ratio of spin precession frequencies of stored ultracold neutrons and $^{199}$Hg atoms is reported. %57 No daily variation of this ratio could be found, from which is set an upper limit on the Lorentz invariance violating cosmic anisotropy field $b_{\bot} < 2 \times 10^{-20} {\rm eV}$ (95% C.L.). This is the first limit for the free neutron. This result is also interpreted as a direct limit on the gravitational dipole moment of the neutron $|g_n| < 0.3 $eV/$c^2$ m from a spin-dependent interaction with the Sun. Analyzing the gravitational interaction with the Earth, based on previous data, yields a more stringent limit $|g_n| < 3 \times 10^{-4} $eV/$c^2 $m.
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Contributor : Emmanuelle Vernay <>
Submitted on : Tuesday, July 28, 2009 - 10:57:53 AM
Last modification on : Thursday, November 19, 2020 - 12:58:41 PM

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I. Altarev, C. A. Baker, G. Ban, G. Bison, K. Bodek, et al.. Test of Lorentz invariance with spin precession of ultracold neutrons. Physical Review Letters, American Physical Society, 2009, 103, pp.081602. ⟨10.1103/PhysRevLett.103.081602⟩. ⟨in2p3-00407985⟩



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