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Published December 15, 2021 | Published + Submitted
Journal Article Open

Impact of Schumann resonances on the Einstein Telescope and projections for the magnetic coupling function


Correlated magnetic noise in the form of Schumann resonances could introduce limitations to the gravitational-wave background searches of future Earth-based gravitational-wave detectors. We consider recorded magnetic activity at a candidate site for the Einstein Telescope, and forecast the necessary measures to ensure that magnetic contamination will not pose a threat to the science goals of this third-generation detector. In addition to global magnetic effects, we study local magnetic noise and the impact it might have on colocated interferometers. We express our results as upper limits on the coupling function of magnetic fields to the interferometer arms, implying that any larger values of magnetic coupling into the strain channel would lead to a reduction in the detectors' sensitivity. For gravitational-wave background searches below ∼30 Hz it will be necessary for the Einstein Telescope magnetic isolation coupling to be two to four orders of magnitude better than that measured in the current Advanced LIGO and Virgo detectors.

Additional Information

© 2021 American Physical Society. (Received 30 October 2021; accepted 30 November 2021; published 27 December 2021) The authors acknowledge access to computational resources provided by the LIGO Laboratory supported by National Science Foundation Grants No. PHY-0757058 and No. PHY-0823459. Furthermore the authors acknowledge the Sos Enattos former mine, hosting the instrumentation used for this study, the Istituto Nazionale di Fisica Nucleare (INFN), the Istituto Nazionale di Geofisica e Vulcanologia (INGV), the European Gravitational Observatory (EGO), the University of Sassary and the Regione Autonoma Sardegna for the support to the site characterization activities. Furthermore the authors would like to thank Michael Coughlin, Irene Fiori and Jan Harms for useful comments and discussions. This paper has been given LIGO DCC number P2100356, Virgo TDS number VIR-1050A-21, and ET TDS number ET-0427A-21. K. J. is supported by FWO-Vlaanderen via Grant No. 11C5720N. K. M. is supported by King's College London through a Postgraduate International Scholarship. M. S. is supported in part by the Science and Technology Facility Council (STFC), United Kingdom, under the research Grant No. ST/P000258/1. Parts of this research were conducted by the Australian Research Council Centre of Excellence for Gravitational Wave Discovery (OzGrav), through Project No. CE170100004.

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Submitted - 2110.14730.pdf

Published - PhysRevD.104.122006.pdf


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