6533b85ffe1ef96bd12c1d85
RESEARCH PRODUCT
Testing isotropy of the universe using the Ramsey resonance technique on ultracold neutron spins
M. HorrasG. BanKlaus KirchA. KozelaPhilipp Schmidt-wellenburgT. LefortJacek ZejmaD. RebreyendMartin RebetezS. RocciaPaul E. KnowlesGuillaume PignolN. V. KhomutovE. PierreWerner HeilErwin GutsmiedlJ. ZennerYu. SobolevM. DaumY. LemièreFlorian M. PiegsaNatalis SeverijnsBernhard LaussOscar Naviliat-cuncicG. QuéménerMartin FertlT. LauerPeter FierlingerA. KraftG. PetzoldtA. S. PazgalevI. AltarevKazimierz BodekAndreas KnechtA. MtchedlishviliB. FrankeAntoine WeisReinhold HenneckGeza ZsigmondSt. KistrynGeorg Bisonsubject
Neutron electric dipole momentAtomic Physics (physics.atom-ph)FOS: Physical sciences[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]Lorentz covariance01 natural sciencesResonance (particle physics)Physics - Atomic PhysicsHigh Energy Physics - ExperimentHigh Energy Physics - Experiment (hep-ex)Quantum mechanics0103 physical sciences[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]NeutronNuclear Experiment (nucl-ex)Electrical and Electronic Engineering010306 general physicsNuclear ExperimentLarmor precessionPhysics[PHYS.PHYS.PHYS-ATOM-PH]Physics [physics]/Physics [physics]/Atomic Physics [physics.atom-ph]Spins010308 nuclear & particles physicsCondensed Matter PhysicsElectronic Optical and Magnetic MaterialsNeutron spectroscopyUltracold neutronsdescription
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.
year | journal | country | edition | language |
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2010-07-05 |