{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"4affbff73290e52bfb0ef99ee7df3f6f0a3467cefbce19a2ed1133c95810ec66","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["a837adbde970e80515b4f1e971e5f83b405eceaf54b4b4dbfd9582e49855d872","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"919ac8674ad035d217396bab9ab0315054fd89a51053f9073f59daf1cb216434","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"classification","assisted_by":[],"external_id":"grav.evaporation-backreaction.endpoint","kind":"phenomenon","literature_status":"open","n":"2","parents":[],"plain":"Hawking's calculation stops working when the black hole shrinks to about $2 \\times 10^{-5}\\,\\mathrm{g}$, the Planck mass. The options include complete disappearance into radiation, a stable tiny leftover, a white hole, or a disconnected baby universe.","posed_since":"","precise":"For a Schwarzschild black hole evaporating from $M \\gg m_P=\\sqrt{\\hbar c/G}$, approximately $2.2 \\times 10^{-5}\\,\\mathrm{g}$, determine the final state at $M \\sim m_P$: complete evaporation with a pure final radiation state, a stable or long-lived remnant, a black-to-white-hole transition, or topology change. An answer is a classification derived in a UV-complete or otherwise controlled framework, giving the remnant mass and lifetime if any and the entropy carried by the final burst.","problem_ref":"a837adbde970e80515b4f1e971e5f83b405eceaf54b4b4dbfd9582e49855d872","references":"","settled_by":"A controlled quantum gravity calculation of the last stage of evaporation, or an observation of the final burst of a primordial black hole.","status_note":"","title":"What remains after a black hole evaporates to the Planck scale?","topic_ref":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"f8ceb0c7efee33b71caa5440ae472871da418456b31ea40dd18cc71d6925a81d","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"8fb4c78e0c616123ebb0980354baaf9050a0a880951175759a0b3e9dc7a1d8c0","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"c7uApe-aZgroOA02D2Z1Z0oQEcwi0K1eyzQauhYmJZOLFDfNST0g4bmim0UNDEi2MRN1uNNR3MIhZztqxcAuBw"},"schema":"pubphys.envelope/1"},"record_hash":"f8ceb0c7efee33b71caa5440ae472871da418456b31ea40dd18cc71d6925a81d","leaf_index":3302}