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Terrestrial Gravity Fluctuations.

Jan Harms1

  • 1Università degli Studi di Urbino 'Carlo Bo', 61029 Urbino, Italy.

Living Reviews in Relativity
|February 10, 2017
PubMed
Summary
This summary is machine-generated.

Terrestrial gravity fluctuations impact gravity experiments, acting as noise for gravitational-wave (GW) detectors and signals in geophysics. Understanding these perturbations is key for advancing GW detection and precision gravimetry.

Keywords:
MitigationNewtonian noiseTerrestrial gravityWiener filter

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Area of Science:

  • Geophysics and Astrophysics
  • Gravitational-Wave Detection
  • Precision Measurement Science

Background:

  • Terrestrial gravity field fluctuations are observed in various gravity experiments, posing challenges and opportunities.
  • Atmospheric pressure and seismic fields create gravity noise, limiting sensitivity in superconducting gravimeters and satellite missions like GRACE.
  • Ground-based gravitational-wave (GW) detectors, such as LIGO and Virgo, face limitations from high-frequency terrestrial gravity fluctuations.

Purpose of the Study:

  • To provide an analytical framework for describing terrestrial gravity perturbations in ground-based gravimetry experiments.
  • To model gravity perturbations from seismic fields, atmospheric disturbances, and mechanical sources.
  • To evaluate noise mitigation strategies for GW detectors and explore geophysical applications of gravity perturbation models.

Main Methods:

  • Derivation and analysis of mathematical models for terrestrial gravity perturbations.
  • Investigation of seismic scattering effects on gravity perturbations.
  • Development of time-domain models for gravity perturbations from atmospheric and seismic point sources.

Main Results:

  • Established analytical frameworks to describe terrestrial gravity perturbations relevant to GW detectors and gravimetry.
  • Evaluated passive and active noise mitigation strategies for gravity noise in GW detectors.
  • Presented new analyses on seismic scattering and time-domain gravity perturbation models.

Conclusions:

  • Accurate modeling of terrestrial gravity fluctuations is crucial for the advancement of gravitational-wave detectors.
  • Understanding these perturbations can also enhance high-precision gravimetry and geophysical studies.
  • Further research is needed to address open questions in terrestrial gravity fluctuation analysis.