{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"f737b0e406b408ecceb9a8f90af5e2cbc441b79d642ae8893a874fad2b8c691a","created":"2026-10-03T07:18:04Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011","81f40ab9b777608cb83bbb0343be0dab3999bc4c0a234695c3ffedcf2886542e"],"salt":"6b9312d279003aee9321b7c6969abf9349e90c18db4c4f67c6cc6b3950842cf1","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"grav.bh-information.soft-hair-information","kind":"well-posed","literature_status":"partially-resolved","n":"1","parents":[{"note":"","parent_revision":"81f40ab9b777608cb83bbb0343be0dab3999bc4c0a234695c3ffedcf2886542e","relation":"special_case"}],"plain":"A black hole can carry tiny extra charges tied to zero-energy gravitons and photons, called soft hair. The question is whether this hair can store enough information to make evaporation information-preserving.","posed_since":"2016","precise":"Supertranslation and superrotation (BMS) charges and the associated soft graviton modes at the horizon and null infinity were proposed as information carriers (Hawking, Perry, Strominger 2016). Count the independent soft-hair states accessible to a Schwarzschild black hole of mass M in the semiclassical regime and determine whether they can purify the Hawking radiation, i.e. carry of order $A c^{3}/(4 G \\hbar)$ units of entropy correlated with the hard quanta. Answer yes or no with the entropy count.","problem_ref":null,"references":"","settled_by":"A computation of the entanglement between soft modes and hard Hawking quanta over the full evaporation, compared with the Bekenstein-Hawking entropy.","status_note":"Several analyses argue soft modes decouple from hard Hawking quanta and cannot purify the radiation; no accepted count shows otherwise as of 2026.","title":"Can soft gravitational charges carry the information of an evaporating black hole?","topic_ref":"f95e49a99ff690ea4913bd0d781eb50f5c958009660d629087f8ddfc66cb8a3b"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"f9ec63e216ed1d566aaa75cfce399691489729a08ca6caa739d2a78a48709460","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"05be5e886288069d15a9d1ceb6c0725529fb0f00773f29799dcb25725bcbda6e","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"I8A5xE06lyb-XZjzBm2EPykwJyzP2bPqwJpFa_ugvE-VAEID0Wz9cYyGuwyz83dbzUJXyjh-XlX1NZiUWBOQAA"},"schema":"pubphys.envelope/1"},"record_hash":"f9ec63e216ed1d566aaa75cfce399691489729a08ca6caa739d2a78a48709460","leaf_index":1467}