{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"40cb0aeac835eeb93316c1f9ca8bf312727997323a05724ad4c54c44f2200f8d","created":"2026-10-03T07:17:54Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011","c1e2a1cd2e6fbd4139fbfdc11f91c70a9fb7e50f5c04e9ce96b450ca2deceb7a"],"salt":"1a1dd701d3780a7f017e96af3e87f9608f810cec28beda50ab98ebe35f650e7d","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"identification","assisted_by":[],"external_id":"astro.fast-radio-bursts.periodic-activity","kind":"well-posed","literature_status":"open","n":"1","parents":[{"note":"","parent_revision":"c1e2a1cd2e6fbd4139fbfdc11f91c70a9fb7e50f5c04e9ce96b450ca2deceb7a","relation":"special_case"}],"plain":"Some repeating sources are active only in windows that recur every 16 or about 160 days, and the clock behind this is unknown.","posed_since":"2020","precise":"FRB 20180916B shows activity windows with period $\\sim 16.3\\,\\mathrm{days}$ and FRB 20121102A a candidate $\\sim 160\\,\\mathrm{day}$ period. Identify the mechanism (binary orbit with a massive companion wind, free precession of a magnetar, or ultra-slow rotation) by predicting frequency-dependent window drift and phase-dependent dispersion measure, rotation measure and polarization. Answer: the mechanism consistent with all phase-resolved data.","problem_ref":null,"references":"","settled_by":"Phase-resolved monitoring of rotation measure, dispersion measure and polarization over many cycles, testing binary-orbit predictions against precession predictions of period drift.","status_note":"","title":"Origin of periodic activity windows in repeating FRB sources","topic_ref":"e34915880c8b4fcf234950c4bc4b644f158dd59b4baa5d82a78b1c9c3951edf9"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"db33e4d89e523c9c22fd25e1de41ca391b0762cfe227e4feb1505ccee8e73265","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"f110a20cd142f10a252386b6cb01eb7a2799a1962080ad781da35cb4f1ea694f","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"eSHjODGoOm8_qONgGiEMxBFjv9GMoASz99PQjgNNX_UFNi_2WLwm1czS6C-DXO6ixOLkSuQy-4zRcNO_0NFxBw"},"schema":"pubphys.envelope/1"},"record_hash":"db33e4d89e523c9c22fd25e1de41ca391b0762cfe227e4feb1505ccee8e73265","leaf_index":528}