{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"fc8e82567fefb3c2b2f17e00d96b78b57d7e1fc6d7b3d5234cd5bd3e0380b0b9","created":"2026-10-03T07:18:04Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"2e5f229f5bcbf95935655dac2a73d726e6cd225527b56edc96f679ef0398d37f","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"grav.bh-microstates.kerr-cft","kind":"well-posed","literature_status":"contested","n":"1","parents":[],"plain":"Rapidly spinning black holes show a hidden symmetry that lets their entropy be computed with a formula from two-dimensional quantum field theories. Whether such a theory really exists for ordinary spinning black holes, like those seen by gravitational-wave detectors, is unknown.","posed_since":"2009","precise":"The Kerr/CFT correspondence reproduces $S = 2\\pi J/\\hbar$ for extremal Kerr via the Cardy formula with central charge $c_L = 12 J/\\hbar$, and hidden conformal symmetry of low-frequency wave equations (2010) extends the Cardy match to non-extremal Kerr. Determine whether a unitary 2D CFT, or another quantum system, with these central charges exists whose states are the microstates of generic Kerr with $0 < a < M$. An answer is a construction or an obstruction (for example inconsistency of the boundary conditions or of modular invariance).","problem_ref":null,"references":"","settled_by":"Construction of a consistent dual quantum system for generic Kerr, or a proof that the required boundary conditions admit no unitary dual.","status_note":"Entropy matches hold, but no dual theory has been constructed as of 2026.","title":"Is there a holographic dual for non-extremal Kerr black 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