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Published July 11, 2014 | Published + Submitted
Journal Article Open

Correlated noise in networks of gravitational-wave detectors: Subtraction and mitigation


One of the key science goals of advanced gravitational-wave detectors is to observe a stochastic gravitational-wave background. However, recent work demonstrates that correlated magnetic fields from Schumann resonances can produce correlated strain noise over global distances, potentially limiting the sensitivity of stochastic background searches with advanced detectors. In this paper, we estimate the correlated noise budget for the worldwide advanced detector network and conclude that correlated noise may affect upcoming measurements. We investigate the possibility of a Wiener filtering scheme to subtract correlated noise from Advanced LIGO searches, and estimate the required specifications. We also consider the possibility that residual correlated noise remains following subtraction, and we devise an optimal strategy for measuring astronomical parameters in the presence of correlated noise. Using this new formalism, we estimate the loss of sensitivity for a broadband, isotropic stochastic background search using 1 yr of LIGO data at design sensitivity. Given our current noise budget, the uncertainty with which LIGO can estimate energy density will likely increase by a factor of ≈12 —if it is impossible to achieve significant subtraction. Additionally, narrow band cross-correlation searches may be severely affected at low frequencies f≲70  Hz without effective subtraction.

Additional Information

© 2014 American Physical Society. Received 9 June 2014; published 11 July 2014. We gratefully acknowledge the use of environmental monitoring data from the LIGO experiment. We thank Grant Meadors, Stan Whitcomb, David Yeaton-Massey, and Shivaraj Kandhasamy for helpful discussions. E. T. is a member of the LIGO Laboratory, which is supported by funding from United States National Science Foundation. LIGO was constructed by the California Institute of Technology and Massachusetts Institute of Technology with funding from the National Science Foundation and operates under cooperative agreement No. PHY-0757058. N. C. and R. S. are supported by NSF Grants No. PHY-1204371 and No. PHY-0855686, respectively. A. E. is supported by NSF Grants No. PHY-0905184 and No. PHY-1205882.

Attached Files

Submitted - 1406.2367v2.pdf

Published - PhysRevD.90.023013.pdf


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August 20, 2023
August 20, 2023