Testing the weak equivalence principle at the Bremen drop tower: report on recent developments

Dittus, Hansjörg; Greger, R.; Lochmann, S.; Vodel, W.; Koch, H.; Nietzsche, Sándor; Glyscinski, J.V. Zameck; Mehls, C.; Mazilu, P.

doi:10.1088/0264-9381/13/11a/006

Cited by 15 publications

(5 citation statements)

References 5 publications

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“…To validate these new theories and explore the applicable scope of WEP, more accurate WEP tests are needed. The accuracy of WEP test using macroscopic objects [59][60][61][62] has reached a level of 10 −13 ∼ 10 −15 . The early work of WEP test using microparticles was done by a neutron interferometer [63,64], the accuracy is only 10 −4 due to experimental technical limitations.…”

Section: Equivalence Principlementioning

confidence: 99%

ZAIGA: Zhaoshan long-baseline atom interferometer gravitation antenna

Zhan

Wang

et al. 2019

Int. J. Mod. Phys. D

143

116

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The Zhaoshan long-baseline Atom Interferometer Gravitation Antenna (ZAIGA) is a new type of underground laser-linked interferometer facility, and is currently under construction. It is in the 200-meter-on-average underground of a mountain named Zhaoshan which is about 80 km southeast to Wuhan. ZAIGA will be equipped with long-baseline atom interferometers, high-precision atom clocks, and large-scale gyros. ZAIGA facility will take an equilateral triangle configuration with two 1-km-apart atom interferometers in each arm, a 300-meter vertical tunnel with atom fountain and atom clocks mounted, and a tracking-and-ranging 1-km-arm-length prototype with lattice optical clocks linked by locked lasers. The ZAIGA facility will be used for experimental research on gravitation and related problems including gravitational wave detection, high-precision test of the equivalence principle of micro-particles, clock based gravitational red-shift measurement, rotation measurement and gravito-magnetic effect. arXiv:1903.09288v4 [physics.atom-ph]

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Section: Equivalence Principlementioning

confidence: 99%

ZAIGA: Zhaoshan long-baseline atom interferometer gravitation antenna

Zhan

Wang

et al. 2019

Int. J. Mod. Phys. D

143

116

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“…Make the inner sphere free-fall by turning off the power supply of the gyroscope during the outer shell free moving in the vacuum outer capsule after cutting off the suspension. This proposed experiment at a drop tower of one hundred meter high could reach an accuracy of ∆a/a < 10 −12 [7]. A more longer-distance free-fall experiment could be done in such a way: A balloon can lift the facilities to about 40 kilometers altitude and then drop it down.…”

mentioning

confidence: 99%

Gravitational Effects of Rotating Bodies

2001

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We study two type effects of gravitational field on mechanical gyroscopes (i.e. rotating extended bodies). The first depends on special relativity and equivalence principle. The second is related to the coupling (i.e. a new force) between the spins of mechanical gyroscopes, which would violate the equivalent principle. In order to give a theoretical prediction to the second we suggest a spin-spin coupling model for two mechanical gyroscopes. An upper limit on the coupling strength is then determined by using the observed perihelion precession of the planet's orbits in solar system. We also give predictions violating the equivalence principle for free-fall gyroscopes .It is known that the gravitational couplings of intrinsic spins of elementary particles have been investigated for long time in both theory and experiment (see, e.g., Ref.[1] and the literature quoted there). On the other hand, some experiments have been performed by use of mechanical gyroscopes and give contradictory results [2][3][4][5][6]. However, in theory the spin of a mechanical gyroscope (i.e. the rotation of an extended body) is essentially different from the intrinsic spin of an elementary particle. A reasonable deduction is then that the gravitational couplings of intrinsic spin could not be used to describe those of the spin of mechanical gyroscope. Thus it is necessary to study theoretically such effects of possible spin-gravitational couplings on the motion of the center-of-mass for a mechanical gyroscope in an external gravitational field.

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“…Traditional WEP tests include torsion balance experiments, [74] drop tower experiments, [75] lunar laser ranging experiments, [76] and macroscopic gyros experiments. [77][78][79] There are few WEP test experiments using microscopic particles, and neutrons were used to test the WEP [80,81] with a poor accuracy.…”

Section: Test Of Equivalence Principlementioning

confidence: 99%

Precision measurement with atom interferometry

Wang¹

2015

Chinese Phys. B

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Development of atom interferometry and its application in precision measurement are reviewed in this paper. The principle, features and the implementation of atom interferometers are introduced, the recent progress of precision measurement with atom interferometry, including determination of gravitational constant and fine structure constant, measurement of gravity, gravity gradient and rotation, test of weak equivalence principle, proposal of gravitational wave detection, and measurement of quadratic Zeeman shift are reviewed in detail. Determination of gravitational redshift, new definition of kilogram, and measurement of weak force with atom interferometry are also briefly introduced.

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Testing the weak equivalence principle at the Bremen drop tower: report on recent developments

Cited by 15 publications

References 5 publications

ZAIGA: Zhaoshan long-baseline atom interferometer gravitation antenna

ZAIGA: Zhaoshan long-baseline atom interferometer gravitation antenna

Gravitational Effects of Rotating Bodies

Precision measurement with atom interferometry

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