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20 April 2024

» arxiv » 1009.6060

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Testing isotropy of the universe using the Ramsey resonance technique on ultracold neutron spins
I. Altarev ; G. Ban ; G. Bison ; K. Bodek ; M. Daum ; M. Fertl ; P. Fierlinger ; B. Franke ; E. Gutsmiedl ; W. Heil ; R. Henneck ; M. Horras ; N. Khomutov ; K. Kirch ; S. Kistryn ; A. Kraft ; A. Knecht ; P. Knowles ; A. Kozela ; T. Lauer ; B. Lauss ; T. Lefort ; Y. Lemière ; A. Mtchedlishvili ; O. Naviliat-Cuncic ; A. Pazgalev ; G. Petzoldt ; F. M. Piegsa ; E. Pierre ; G. Pignol ; G. Quéméner ; M. Rebetez ; D. Rebreyend ; S. Roccia ; P. Schmidt-Wellenburg ; N. Severijns ; Yu. Sobolev ; A. Weis ; J. Zejma ; J. Zenner ; G. Zsigmond ;
Date:	30 Sep 2010
Abstract:	Physics at the Planck scale could be revealed by looking for tiny violations of fundamental symmetries in low energy experiments. In 2008, a sensitive test of the isotropy of the Universe using has been performed with stored ultracold neutrons (UCN), this is the first clock-comparison experiment performed with free neutrons. During several days we monitored the Larmor frequency of neutron spins in a weak magnetic field using the Ramsey resonance technique. An non-zero cosmic axial field, violating rotational symmetry, would induce a daily variation of the precession frequency. Our null result constitutes one of the most stringent tests of Lorentz invariance to date.
Source:	arXiv, 1009.6060
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