New constraints on Lorentz invariance violation from the neutron electric dipole moment

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Published 4 January 2011 Europhysics Letters Association
, , Citation I. Altarev et al 2010 EPL 92 51001 DOI 10.1209/0295-5075/92/51001

0295-5075/92/5/51001

Abstract

We propose an original test of Lorentz invariance in the interaction between a particle spin and an electromagnetic field and report on a first measurement using ultracold neutrons. We used a high-sensitivity neutron electric dipole moment (nEDM) spectrometer and searched for a direction dependence of an nEDM signal leading to a modulation of its magnitude at periods of 12 and 24 hours. We constrain such a modulation to d12 < 10×10−25e cm and d24 < 14×10−25e cm at 95% C.L. The result translates into a limit on the energy scale for this type of Lorentz violation effect at the level of εLV > 1010 GeV.

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10.1209/0295-5075/92/51001