{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"b48cba36f63d7bd770e633f53a76e02add2dabe492b79faa7a755f8d841311b3","created":"2026-10-03T07:18:04Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"f9cbca0bfa8aecba91cf117ac028e316d61c402ef10bddc48cfc0a70690ca31a","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"value","assisted_by":[],"external_id":"grav.bh-microstates.schwarzschild-state-count","kind":"well-posed","literature_status":"open","n":"1","parents":[],"plain":"For a black hole with no charge and no spin, like those formed from dead stars, nobody has derived its number of internal states from a microscopic theory. All exact counts so far need extra charges and supersymmetry (a symmetry between matter and force particles).","posed_since":"","precise":"Within a UV-complete theory, identify the sector of the Hilbert space that describes a 4D Schwarzschild black hole of mass $M$ and compute the logarithm of its dimension, reproducing $S = 4 \\pi G M^2/(\\hbar c)$ (entropy in units of $k_B$). An answer is a controlled microscopic count valid away from supersymmetry and extremality.","problem_ref":null,"references":"","settled_by":"A microscopic state count, in a defined UV-complete theory, that matches $4 \\pi G M^{2}/(\\hbar c)$ and its logarithmic correction.","status_note":"Exact counts exist only for supersymmetric or near-supersymmetric black holes; none for Schwarzschild as of 2026.","title":"Count the microstates of a four-dimensional Schwarzschild black 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