{"paper":{"title":"Circular polarization of the cosmic microwave background induced by the optical Magnus effect on gravitational lensing","license":"http://creativecommons.org/licenses/by/4.0/","headline":"Incorporating the optical Magnus effect into gravitational lensing induces circular polarization in the CMB from temperature fluctuations.","cross_cats":["gr-qc","hep-ph"],"primary_cat":"astro-ph.CO","authors_text":"Yusuke Nishida","submitted_at":"2026-05-16T11:50:38Z","abstract_excerpt":"Polarization of the cosmic microwave background (CMB) brings out information not only on the early universe but also on the late-time large-scale structure via weak gravitational lensing. Here, we show that circular polarization is induced in principle from CMB temperature fluctuations when the optical Magnus effect is incorporated into gravitational lensing. This is a consequence of the transverse shift of a trajectory of light depending on its helicity that requires right-handed and left-handed components at the same observation point to be sourced from different points of the surface of las"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"Circular polarization is induced in principle from CMB temperature fluctuations when the optical Magnus effect is incorporated into gravitational lensing, because right-handed and left-handed components at the same observation point are sourced from different points of the surface of last scattering.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The optical Magnus effect produces a helicity-dependent transverse shift for CMB photons propagating through gravitational potentials in the same manner as for light in dielectric media; this assumption is invoked when mapping the shift to different last-scattering points (abstract and implied derivation).","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"Circular polarization of the CMB is generated by the helicity-dependent transverse shift of photon trajectories under the optical Magnus effect during gravitational lensing.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"Incorporating the optical Magnus effect into gravitational lensing induces circular polarization in the CMB from temperature fluctuations.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"c78ddd9f099b11759594a9b948f38c871cbd23f989cf48e5c922fa1e65152755"},"source":{"id":"2605.16945","kind":"arxiv","version":1},"verdict":{"id":"de323097-59d1-4872-80b5-f260bf724c80","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-19T20:26:27.602381Z","strongest_claim":"Circular polarization is induced in principle from CMB temperature fluctuations when the optical Magnus effect is incorporated into gravitational lensing, because right-handed and left-handed components at the same observation point are sourced from different points of the surface of last scattering.","one_line_summary":"Circular polarization of the CMB is generated by the helicity-dependent transverse shift of photon trajectories under the optical Magnus effect during gravitational lensing.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The optical Magnus effect produces a helicity-dependent transverse shift for CMB photons propagating through gravitational potentials in the same manner as for light in dielectric media; this assumption is invoked when mapping the shift to different last-scattering points (abstract and implied derivation).","pith_extraction_headline":"Incorporating the optical Magnus effect into gravitational lensing induces circular polarization in the CMB from temperature fluctuations."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2605.16945/integrity.json","findings":[],"available":true,"detectors_run":[{"name":"doi_compliance","ran_at":"2026-05-19T20:40:51.799459Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"doi_title_agreement","ran_at":"2026-05-19T20:31:19.072388Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"cited_work_retraction","ran_at":"2026-05-19T20:21:56.880065Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"claim_evidence","ran_at":"2026-05-19T18:41:56.243033Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"ai_meta_artifact","ran_at":"2026-05-19T18:33:26.325936Z","status":"skipped","version":"1.0.0","findings_count":0}],"snapshot_sha256":"a9653ec806941ffddeb1a8ce376905d74c2ef2c58921d2d02616fe1dddd007d0"},"references":{"count":47,"sample":[{"doi":"","year":2018,"title":"Planck 2018 results I. 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