{"paper":{"title":"Scattered light noise at LIGO Livingston Observatory during O4","license":"http://creativecommons.org/licenses/by/4.0/","headline":"High-SNR scattered light glitches at LIGO Livingston are driven solely by microseismic ground motion at the corner station in the X direction.","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"Anamaria Effler, Debasmita Nandi, Gabriela Gonz\\'alez, Huyen Pham, Robert Schofield, Siddharth Soni, Tabata Aira Ferreira, Timothy O'Hanlon, V. V. Frolov","submitted_at":"2026-05-13T21:49:46Z","abstract_excerpt":"Scattered light is one of the most common sources of noise in the LIGO gravitational wave detectors. Light scattering is a highly non-linear process through which motion at low frequencies gets up-converted and creates noise in a higher frequency band in the detector data. From the beginning of the fourth observation run, many glitches appeared in the data of LIGO Livingston detector in the frequency range 10-40 Hz, and the morphology of these glitches suggested that they were produced by scattered light. From our analysis, we identified two different populations of scattered light glitches, o"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"High-SNR scattered light glitches are modulated solely by microseismic ground motion at the corner station along the X direction; low-SNR glitches are modulated by 10-30 Hz vertical ground motion through a specific vacuum chamber; baffles and an isolation platform produced significant reductions.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"That the observed statistical correlations between specific ground-motion channels and glitch rates demonstrate direct causal coupling mechanisms rather than indirect or coincidental associations.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"Scattered light glitches at LIGO Livingston during O4 were traced to microseismic and high-frequency ground motions and mitigated by baffles and seismic isolation.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"High-SNR scattered light glitches at LIGO Livingston are driven solely by microseismic ground motion at the corner station in the X direction.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"f44f0a31eba27394ba04f3c63c3933a1bb0b61991a233d08b9a38d694403dca6"},"source":{"id":"2605.14143","kind":"arxiv","version":1},"verdict":{"id":"18038771-127a-4dc6-9db9-ed98415a16c6","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-15T01:50:45.941488Z","strongest_claim":"High-SNR scattered light glitches are modulated solely by microseismic ground motion at the corner station along the X direction; low-SNR glitches are modulated by 10-30 Hz vertical ground motion through a specific vacuum chamber; baffles and an isolation platform produced significant reductions.","one_line_summary":"Scattered light glitches at LIGO Livingston during O4 were traced to microseismic and high-frequency ground motions and mitigated by baffles and seismic isolation.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"That the observed statistical correlations between specific ground-motion channels and glitch rates demonstrate direct causal coupling mechanisms rather than indirect or coincidental associations.","pith_extraction_headline":"High-SNR scattered light glitches at LIGO Livingston are driven solely by microseismic ground motion at the corner station in the X direction."},"references":{"count":20,"sample":[{"doi":"","year":2024,"title":"However, in O4, the scattered light noise did not seem to be correlated with any particular frequency","work_id":"d3f19184-fa35-4adc-895a-35aff192b8c2","ref_index":1,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2025,"title":"is the one which holds the optics table from which the test mass mirrors are suspended with quadruple pendu- lums and the beam splitter (BS) is suspended using a triple suspension. A baffle (Arm Cavit","work_id":"4b7c6fbc-040b-4324-ab4d-aedcdfb12641","ref_index":2,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2024,"title":"Com- paring the top panels of the figures 17a and 17b, we can see a significant reduction in the hourly glitch rate given the same amount of microseismic ground motion","work_id":"7b9d4ad2-35d5-4172-b21b-de1b2eec96a0","ref_index":3,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2016,"title":"Observation of Gravitational Waves from a Binary Black Hole Merger","work_id":"ab878228-151c-4a29-8026-a4308b076d30","ref_index":4,"cited_arxiv_id":"1602.03837","is_internal_anchor":true},{"doi":"","year":2025,"title":"GWTC-4.0: Updating the Gravitational-Wave Transient Catalog with Observations from the First Part of the Fourth LIGO-Virgo-KAGRA Observing Run","work_id":"373a2c61-2309-4528-87c8-9053657b5ebd","ref_index":5,"cited_arxiv_id":"2508.18082","is_internal_anchor":true}],"resolved_work":20,"snapshot_sha256":"6128d1ed2bd3850936064117779865b6b17b3ef2a400b75f8bf5d438f8db17b3","internal_anchors":4},"formal_canon":{"evidence_count":2,"snapshot_sha256":"ae7983de8b56129661892beeae12a910b85d544bdbf86ebfa7d49f8325bdcbee"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}