{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"2ee561486f92d2fa6d1549e11e0260fd427019b7ffc433be810c83060ce9f113","created":"2026-10-03T07:18:04Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"7400bf41c42ca91291c77ee3a1aa617f725bffa03220fb5d3c613b5762c017da","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":"1","parents":[],"plain":"Hawking's calculation stops working when the black hole shrinks to about $2 x 10^{-5}\\,\\mathrm{g}$, 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 $2.2 x 10^{-5}\\,\\mathrm{g}$, 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":null,"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":"c6f0f7e9427ae2192894c5f52b801031bd05930fb85200c49b24b33d76d27ba6"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"a837adbde970e80515b4f1e971e5f83b405eceaf54b4b4dbfd9582e49855d872","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"f6c126e8f59afbc330c0c425b1a990d20e4bcdf98cb3d01d9711c8467c8de72d","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"XtJnODjQR0EQJgJex8QFa00Phmlx5oyL_0nw6vyUequJF6jzCjDmhik-3tgnE-0sf0fwPA4XWHJ471WYsqiUBQ"},"schema":"pubphys.envelope/1"},"record_hash":"a837adbde970e80515b4f1e971e5f83b405eceaf54b4b4dbfd9582e49855d872","leaf_index":1477}