{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"cdf656557a0235b0a23df559d5e7dd3cda89c60b7238adf1b5fd6a6e4d00e7d0","created":"2026-10-03T07:18:04Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"971829a56b901917f07161c07a0150cbd088cf53c05bc5b68215fc8b746a7dd7","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"grav.modified-gravity.scalarization-constraints","kind":"well-posed","literature_status":"open","n":"1","parents":[],"plain":"In some theories a black hole becomes surrounded by a cloud of a new scalar field once it is small enough or spins fast enough. This would change how binaries emit gravitational waves.","posed_since":"2018","precise":"In scalar-Gauss-Bonnet theories with $f(\\phi)$ allowing spontaneous scalarization (Doneva and Yazadjiev 2018; Silva et al. 2018), determine from binary inspirals (dipole radiation entering at $-1$ post-Newtonian order) and ringdowns whether scalarized black holes exist, by constraining the coupling length $\\sqrt{\\alpha}$ relative to observed black hole masses. An answer is a detection of dipole radiation or a bound on $\\sqrt{\\alpha}$ that excludes scalarization for all observed masses.","problem_ref":null,"references":"","settled_by":"Gravitational-wave constraints on $\\sqrt{\\alpha}$ below the horizon scale of the lightest observed black holes, or a detection of scalar dipole emission.","status_note":"Current bounds on $\\sqrt{\\alpha}$ from binary inspirals are approximately of order kilometers, leaving scalarization of the lightest black holes allowed as of 2026.","title":"Do black holes carry scalar hair from spontaneous 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