{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"83220d1ccfb92614ffff4e413411774c2c190ea7e50eba0c334110b9ccd6d123","created":"2026-10-03T07:18:02Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011","758593ddd21934f5cafd29de60d162dd327db8579db4b33708c8bb9394fd068a"],"salt":"0fba48fcb201e3654faae10bd9a95c0ab299ce3df11198976923316aa1e4fa27","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"cosmo.cosmic-magnetism.field-helicity","kind":"well-posed","literature_status":"open","n":"1","parents":[{"note":"","parent_revision":"758593ddd21934f5cafd29de60d162dd327db8579db4b33708c8bb9394fd068a","relation":"special_case"}],"plain":"Magnetic fields produced in the early universe by processes that distinguish left from right would be twisted with a preferred handedness. Measuring that twist would point to their origin.","posed_since":"","precise":"Measure the magnetic helicity of void fields through parity-odd correlations in the arrival directions and energies of cascade $\\gamma$ rays (the $Q$ statistic of Tashiro and Vachaspati) or through Faraday rotation. CP-violating magnetogenesis (for example during baryogenesis) predicts maximal helicity of one sign. An answer is a detection with sign, or a bound on the helical fraction.","problem_ref":null,"references":"","settled_by":"Parity-odd statistics of diffuse GeV gamma rays from Fermi and future gamma-ray telescopes with controlled Galactic foregrounds.","status_note":"","title":"Do intergalactic magnetic fields carry net helicity?","topic_ref":"4a10d151d11d41a3a49cfa9ae855770ef191bf64efebccf6b46e1162c895e62e"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"5367d41b7a5a05cfc5300007a1437cb9bfe28c6063342145c1ce2de136af55b7","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"1a4d3afc33e0a2e5f1b11855b8de13c963846a7fbcd0e1151725c1a8ced9a87c","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"U7lFSVgl-OIOpVzjNVatMaKmNH7hMpvuPPPRWyMCPF8unr4aRSl7yP6_S7qsSwnols15Dv8QHfuoPCmv7D2xDQ"},"schema":"pubphys.envelope/1"},"record_hash":"5367d41b7a5a05cfc5300007a1437cb9bfe28c6063342145c1ce2de136af55b7","leaf_index":1236}