Test of the Equivalence Principle with Chiral Masses Using a Rotating Torsion Pendulum

Zhu, Lin; Liu, Qi; Zhao, Honghong; Gong, Qi-Long; Yang, Shan-Qing; Luo, Pengshun; Shao, Cheng-Gang; Wang, Qinglan; Tu, Lai; Luo, Jun

doi:10.1103/physrevlett.121.261101

Cited by 32 publications

(24 citation statements)

References 38 publications

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“…Finally, we would like to remark that even though the electroweak force is the only one among the fundamental interactions that incorporates PV naturally, there are some interesting models that extend the usual gravitational theory (Newtonian or Einsteinian) by incorporating PV effects. Although their possible effects towards establishing complete enantioselection have not been considered until very recently [37], here we remark that some of the parity-violating extensions of general relativity proposed in [37,38] have been already tested [39], therefore paving the way for future experimental observations of gravity-induced homochirality.…”

Section: Introductionmentioning

confidence: 93%

Homochirality: A Perspective from Fundamental Physics

Dorta-Urra

Bargueño

2019

Symmetry

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Section: Introductionmentioning

confidence: 93%

Homochirality: A Perspective from Fundamental Physics

Dorta-Urra

Bargueño

2019

Symmetry

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“…They used a rotating torsion balance to study the differential acceleration of various materials in the Earth's gravitational field; their most sensitive constraint on EP violation came from tests using beryllium and titanium test bodies [14]. Their work is complemented by the work of a group at Huazhong University of Science and Technology, China who also used a rotating torsion balance [15]. There is yet another set of torsion balance EP experiments which operate in the "Dicke/Braginsky" mode, where the differential acceleration of tests masses toward the Sun is measured.…”

Section: Types Of Wep Testsmentioning

confidence: 99%

“…Eötvös -1922 [1] η < 4 × 10 −9 Princeton -1964 [17] η = [1.3 ± 1.0] × 10 −11 Moscow -1972 [18] η = [0.3 ± 0.9] × 10 −12 Eöt-Wash -2012 [14] η = [−0.7 ± 1.3] × 10 −13 Huazhong -2018 [15] With this in mind, G εε Lab hopes to push forward and test the EP at the level of η ∼ 5 × 10 −14 .…”

Section: Types Of Wep Testsmentioning

confidence: 99%

“…From cross couplings in the various modes of the balance bob, pendular oscillations are capable of feeding energy into the torsional modes. To address this, the feedthrough also features an assembly similar to those used in [25,15] which damps pendular oscillations. A copper plate attached to the fiber is suspended between two ceramic ring magnets such that as the balance bob swings the copper plate will follow a similar motion.…”

Section: Pos(ffk2019)043mentioning

confidence: 99%

See 1 more Smart Citation

$G^{\epsilon\epsilon}$ Lab's Equivalence Principle Experiment

Wagoner¹,

Cowsik²,

Huth³

et al. 2019

Proceedings of International Conference on Precision Physics and Fundamental Physical Constants — PoS(FFK2019)

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Baron Roland von Eötvös performed amazing experiments on the equivalence of inertial and gravitational mass. Since his work experiments have become progressively more refined. The G εε Lab at Washington University in St. Louis has built a new experiment in the hopes of refining these tests even further. We have operated a prototype of this experiment by continuously monitoring the angular orientation of a torsion balance for over 115 days and the results we have obtained are promising. The experience we have gained from this experiment suggest the need for improved thermal and magnetic shielding; it also gives us confidence that long-period torsion balances have the ability to significantly improve the bounds on violation of the Equivalence Principle. Here we describe our instrument and how these experiences will be used to improve our next generation torsion balance.

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“…Mass tests of EP have been performed in different ways including Lunar laser ranging 15 , torsion balance 16,17 , satellite 3 and AIs [4][5][6][7][8][9] . However, it is unknown whether the energy behaves the same as mass in a gravitational field although MEE holds at least at 10 -7 level 18 .…”

mentioning

confidence: 99%

A Mass-Energy United Test of the Equivalence Principle

Zhan

Zhang

et al. 2020

Preprint

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The equivalence principle (EP) is one of the basic assumptions of general relativity. Almost all new theories[1] that attempt to unify gravity with the standard model[2] require the EP be broken. Experimental tests of EP provide opportunities for verification of different theoretical models and emergence of new physics. Traditional mass tests[3-9] of EP have achieved the precision of 10-15 level[3]. Tests with quantum properties including spin[10,11], superposition[12], quantum statistics[10] and internal state[4,13], have been performed, and entanglement[14] test was also proposed. Energy is another very important property and is related to mass by the mass-energy equivalence (MEE). However, mass-energy united tests of EP have never been carried out. Here, we achieve for the first time the united EP test covering energy interval from micro-eV to giga-eV by a mass and internal energy specified atom interferometer (AI). The AI was realized by taking advantage of the Four-Wave Double-diffraction Raman transition (4WDR) method[7] for specified internal energy states, and by extending 4WDR to include excited states. The Eötvös parameters of the four paired combinations (87Rb|F＝1>-85Rb|F＝2>, 87Rb|F＝2>-85Rb|F＝2>, 87Rb|F＝1>-85Rb|F＝3> and 87Rb|F＝2>-85Rb|F＝3>) were measured to be η1=(1.5±3.2)×10-10, η2=(-0.6 ±3.7)×10-10, η3=(-2.5±4.1)×10-10 and η4=(-2.7±3.6)×10-10, respectively. The violation parameters of mass and internal energy are constrained to η0 = (-0.8±1.4)×10-10 and β = (-0.6±6.9)×105. This work opens a door for united tests of EP and MEE in large energy range with quantum systems.

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Test of the Equivalence Principle with Chiral Masses Using a Rotating Torsion Pendulum

Cited by 32 publications

References 38 publications

Homochirality: A Perspective from Fundamental Physics

Homochirality: A Perspective from Fundamental Physics

$G^{\epsilon\epsilon}$ Lab's Equivalence Principle Experiment

A Mass-Energy United Test of the Equivalence Principle

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