{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"02e3fb72dcd134b10ec0616db02fa945755782010e679ea2f4f12f3dc371f18e","created":"2026-10-03T07:18:02Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"f0a7725856387de134b0500b9a96a6f35d594bea7a40738ee6883835bf6c7540","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"identification","assisted_by":[],"external_id":"cosmo.cmb-anomalies.chance-or-physics","kind":"phenomenon","literature_status":"open","n":"1","parents":[],"plain":"Several odd patterns appear on the largest scales of the microwave sky, each with odds of roughly one in a hundred to one in a thousand. With a single sky to look at, it is hard to know if they mean anything.","posed_since":"","precise":"The anomalies are: low quadrupole power, lack of temperature correlation above 60 degrees (S_1/2), quadrupole-octopole alignment, hemispherical power asymmetry, the cold spot and an odd-even parity asymmetry, each at $p \\sim 0.1 \\text{ to } 1\\,\\text{percent}$ in LCDM, with a posteriori choice of statistics. Decide whether they are flukes or physical by testing predictions fixed in advance on independent data (large-angle E-mode polarization, CMB lensing, galaxy surveys).","problem_ref":null,"references":"","settled_by":"Pre-registered tests on large-angle polarization and lensing maps whose outcome under LCDM is predicted conditional on the temperature map.","status_note":"2025 re-analyses of foreground-cleaned low-multipole maps still find the temperature anomalies at similar significance.","title":"Are the CMB large-angle anomalies statistical flukes or 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