{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"7fef42038149adc41544183da74a1db47aa04882762385b1ead35441af817fcc","created":"2026-10-03T07:18:04Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011","a837adbde970e80515b4f1e971e5f83b405eceaf54b4b4dbfd9582e49855d872"],"salt":"551e500c07ba02aa933920ec73d8f16e0254235f145327a9aabfb53c1f5933ec","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"grav.evaporation-backreaction.black-to-white","kind":"well-posed","literature_status":"open","n":"1","parents":[{"note":"","parent_revision":"a837adbde970e80515b4f1e971e5f83b405eceaf54b4b4dbfd9582e49855d872","relation":"special_case"}],"plain":"Some quantum gravity models predict that the collapsed matter bounces back, turning the black hole into a white hole that releases what fell in. The predicted lifetime, and therefore any observable signal, depends on poorly controlled quantum effects.","posed_since":"2014","precise":"Loop quantum gravity and related models propose a quantum transition from black hole to white hole (Haggard and Rovelli 2014) with a lifetime scaling between $M^{2}$ and $M^{3}$ in Planck units. Compute the transition amplitude from a well-defined quantum gravity path integral and determine whether this channel dominates over Hawking evaporation. Answer yes or no, with the lifetime as a function of $M$.","problem_ref":null,"references":"","settled_by":"A controlled amplitude calculation fixing the tunneling lifetime, compared with the Hawking evaporation time of order $G^{2} M^{3}/(\\hbar c^{4})$.","status_note":"Lifetime estimates remain model-dependent as of 2026.","title":"Does an evaporating black hole tunnel into a white hole?","topic_ref":"c6f0f7e9427ae2192894c5f52b801031bd05930fb85200c49b24b33d76d27ba6"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"01e14b62e118c5f3abb0fd9f5f759e9e057f2f92ffa46a988b8b5eb22ece8c60","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"9a4f09a95146cb9213f0f0d02019262b54d4fd04ae4959cb8e24b56b5c5d6643","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"Cf5JblJJOY3FHq17PK5QgZ08HGvvxsKPqOMhN4oqoxhBI6nEtmuqopvEhuxBVyv_0_unpLvNak3xyW8kAB6fDA"},"schema":"pubphys.envelope/1"},"record_hash":"01e14b62e118c5f3abb0fd9f5f759e9e057f2f92ffa46a988b8b5eb22ece8c60","leaf_index":1478}