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Towards constraining parity-violations in gravity with satellite gradiometry.

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Title: Towards constraining parity-violations in gravity with satellite gradiometry.
Authors: Xu, Peng1,2,3 xupeng@amss.ac.cn, Wang, Zhi1,2,4, Qiang, Li-E5
Source: Physics Letters B. Feb2019, Vol. 789, p378-386. 9p.
Subjects: Constraints (Physics), Parity (Physics), Curvature, Gravitational fields, Gravimeters (Geophysical instruments)
Abstract: Abstract Parity violation in gravity, if existed, could have important implications, and it is meaningful to search and test the possible observational effects. Chern–Simons modified gravity serves as a natural model for gravitational parity-violations. Especially, considering extensions to Einstein–Hilbert action up to second order curvature terms, it is known that theories of gravitational parity-violation will reduce to the dynamical Chern–Simons gravity. In this letter, we outline the theoretical principles of testing the dynamical Chern–Simons gravity with orbiting gravity gradiometers, which could be naturally incorporated into future satellite gravity missions. The secular gravity gradient signals, due to the Mashhoon–Theiss (anomaly) effect, in dynamical Chern–Simons gravity are worked out, which can improve the constraint of the corresponding Chern–Simons length scale ξ c s 1 4 obtained from such measurement scheme. For orbiting superconducting gradiometers or gradiometers with optical readout, a bound ξ c s 1 4 ≤ 10 6 km (or even better) could in principle be obtained, which will be at least 2 orders of magnitude stronger than the current one based on the observations from the GP-B mission and the LAGEOS I, II satellites. [ABSTRACT FROM AUTHOR]
Copyright of Physics Letters B is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Abstract Parity violation in gravity, if existed, could have important implications, and it is meaningful to search and test the possible observational effects. Chern–Simons modified gravity serves as a natural model for gravitational parity-violations. Especially, considering extensions to Einstein–Hilbert action up to second order curvature terms, it is known that theories of gravitational parity-violation will reduce to the dynamical Chern–Simons gravity. In this letter, we outline the theoretical principles of testing the dynamical Chern–Simons gravity with orbiting gravity gradiometers, which could be naturally incorporated into future satellite gravity missions. The secular gravity gradient signals, due to the Mashhoon–Theiss (anomaly) effect, in dynamical Chern–Simons gravity are worked out, which can improve the constraint of the corresponding Chern–Simons length scale ξ c s 1 4 obtained from such measurement scheme. For orbiting superconducting gradiometers or gradiometers with optical readout, a bound ξ c s 1 4 ≤ 10 6 km (or even better) could in principle be obtained, which will be at least 2 orders of magnitude stronger than the current one based on the observations from the GP-B mission and the LAGEOS I, II satellites. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Physics Letters B is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.physletb.2018.12.049
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      – Code: eng
        Text: English
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        Type: general
      – SubjectFull: Parity (Physics)
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      – SubjectFull: Gravitational fields
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      – SubjectFull: Gravimeters (Geophysical instruments)
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              Text: Feb2019
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