Search for anomalous spin-dependent forces with a polarized-mass torsion pendulum

Ritter, R. C.; Winkler, L. I.; Gillies, G. T.

doi:10.1103/physrevlett.70.701

Cited by 61 publications

(63 citation statements)

References 11 publications

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“…IV, but could be a possible goal for the future [32]. Moody and Wilczek [33] have argued that centimeter-scale experiments with polarized bodies would be more promising, and several attempts in this direction have been made [34][35][36][37].…”

Section: Theoretical Predictionsmentioning

confidence: 99%

Experimental status of gravitational-strength forces in the sub-centimeter regime

1999

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Section: Theoretical Predictionsmentioning

confidence: 99%

Experimental status of gravitational-strength forces in the sub-centimeter regime

1999

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“…Only a few experiments for distances below 100 mm have placed upper limits on the product coupling in a system of magnetized media and test masses [6]. One experiment [13] had peak sensitivity at ∼ 100 mm and two other ones [14,15] had peak sensitivity at ∼ 10 mm.The constraint for the g s g p presented in this article is competitive in the distance range of 1 < λ < 10 3 µm. In the experimental method used [16,17,18,19] UCN move above a nearly perfect horizontal mirror in the presence of the Earth's gravitational field.…”

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confidence: 99%

Constraint on the coupling of axionlike particles to matter via an ultracold neutron gravitational experiment

et al. 2007

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We present a new constraint for the axion monopole-dipole coupling in the range of 1 µm -a few mm, previously unavailable for experimental study. The constraint was obtained using our recent results on the observation of neutron quantum states in the Earth's gravitational field. We exploit the ultimate sensitivity of ultra-cold neutrons (UCN) in the lowest gravitational states above a material surface to any additional interaction between the UCN and the matter, if the characteristic interaction range is within the mentioned domain. In particular, we find that the upper limit for the axion monopole-dipole coupling constant is gpgs/( c) < 2 10 −15 for the axion mass in the "promising" axion mass region MA ∼ 1 meV.A vanishing value for the neutron electric dipole moment motivated the introduction of hypothetical light (pseudo) scalar bosons (commonly called axions), as an extension of the Standard Model [1,2,3,4]. According to the suggested theories the axion mass could be in the range of 10 −6 < M A < 10 −1 eV, while its coupling to photons, leptons and nucleons is not fixed by the existing models (though it is extremely weak). Following the theoretical predictions mentioned intensive searches for axions have been performed over recent decades. These studies include testing the astrophysical consequences of the axion theories, QED effects (axion-two photon coupling) and macroscopic forces (spin-matter coupling). They put severe constraints on axion-matter coupling in different axion mass ranges. A detailed review of axion studies can be found in [5,6].The recently reported positive results of the PVLAS experiment on light polarization rotation in a vacuum in the presence of a transverse magnetic field [7] may be seen as evidence of the long sought axion [8]. According to [7], the mass of neutral boson possibly responsible for the observed signal is 1 < M A < 1.5 meV.The value of the axion-photon coupling strength obtained from the PVLAS experiment is in contradiction with recent CAST observations [9]. Several ideas have been discussed recently, in [10,11], capable of explaining this discrepancy.This intriguing result makes it particularly important to carry out independent testing on the axion-matter coupling in the corresponding distance range of 130 < λ < 200 µm.In the present Letter we report on constraints for axion monopole-dipole coupling. Such coupling results in a spin-matter CP violating Yukawa-type interaction potential [12]between spin and matter, where g p g s is the product of couplings at the scalar and polarized vertices and λ is the force range. Here r is the distance between a neutron and a nucleus, n = r/r is a unitary vector, and m is the nucleon mass. Only a few experiments for distances below 100 mm have placed upper limits on the product coupling in a system of magnetized media and test masses [6]. One experiment [13] had peak sensitivity at ∼ 100 mm and two other ones [14,15] had peak sensitivity at ∼ 10 mm.The constraint for the g s g p presented in this article is competitive in the dista...

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“…Spin-inertia and spin-gravity interactions are the subject of numerous theoretical [9,10,11,12,13,14,15,16] and experimental efforts [17,18,19,20,21]. At the same time precise Earth-bound and near space experimental tests of fundamental theories require that inertial effects be identified with great accuracy.…”

Section: Introductionmentioning

confidence: 99%

Quantum Systems in Weak Gravitational Fields

Papini

2002

Advances in the Interplay Between Quantum and Gravity Physics

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Search for anomalous spin-dependent forces with a polarized-mass torsion pendulum

Cited by 61 publications

References 11 publications

Experimental status of gravitational-strength forces in the sub-centimeter regime

Experimental status of gravitational-strength forces in the sub-centimeter regime

Constraint on the coupling of axionlike particles to matter via an ultracold neutron gravitational experiment

Quantum Systems in Weak Gravitational Fields

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