{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:XTI6OTX3FMNNJYXQHYJIFJ3OXG","short_pith_number":"pith:XTI6OTX3","canonical_record":{"source":{"id":"2512.09460","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-th","submitted_at":"2025-12-10T09:29:15Z","cross_cats_sorted":["gr-qc"],"title_canon_sha256":"fee50cf8cf40662601976f1d1be20600057d688beb07b30425c66631f153995c","abstract_canon_sha256":"c47bab28935018a8730bdb6bde55aaf7ee09d9ea0eacbdec0ef2758e458fb5eb"},"schema_version":"1.0"},"canonical_sha256":"bcd1e74efb2b1ad4e2f03e1282a76eb9a9b86654396c18e752f37f29e85c47c4","source":{"kind":"arxiv","id":"2512.09460","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2512.09460","created_at":"2026-06-30T02:17:12Z"},{"alias_kind":"arxiv_version","alias_value":"2512.09460v2","created_at":"2026-06-30T02:17:12Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2512.09460","created_at":"2026-06-30T02:17:12Z"},{"alias_kind":"pith_short_12","alias_value":"XTI6OTX3FMNN","created_at":"2026-06-30T02:17:12Z"},{"alias_kind":"pith_short_16","alias_value":"XTI6OTX3FMNNJYXQ","created_at":"2026-06-30T02:17:12Z"},{"alias_kind":"pith_short_8","alias_value":"XTI6OTX3","created_at":"2026-06-30T02:17:12Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:XTI6OTX3FMNNJYXQHYJIFJ3OXG","target":"record","payload":{"canonical_record":{"source":{"id":"2512.09460","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-th","submitted_at":"2025-12-10T09:29:15Z","cross_cats_sorted":["gr-qc"],"title_canon_sha256":"fee50cf8cf40662601976f1d1be20600057d688beb07b30425c66631f153995c","abstract_canon_sha256":"c47bab28935018a8730bdb6bde55aaf7ee09d9ea0eacbdec0ef2758e458fb5eb"},"schema_version":"1.0"},"canonical_sha256":"bcd1e74efb2b1ad4e2f03e1282a76eb9a9b86654396c18e752f37f29e85c47c4","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-06-30T02:17:12.774687Z","signature_b64":"HlZblo+gyhKfXONjBp+dKS9XHz+oudyPalPqmKXwnWRyFch8KNR2OSP7FEJ01MUVYSk9/sE5rYoB45PAfMDSCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bcd1e74efb2b1ad4e2f03e1282a76eb9a9b86654396c18e752f37f29e85c47c4","last_reissued_at":"2026-06-30T02:17:12.773932Z","signature_status":"signed_v1","first_computed_at":"2026-06-30T02:17:12.773932Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2512.09460","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-06-30T02:17:12Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dG3kMPcmiN6pqfsK/oZi/uuptQhazYMecdbsDsFKw+BXuLn6oYe3GuMdcNnKhATdZ3WWYFdZy3P+hsqzJFQRBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-10T21:08:43.324456Z"},"content_sha256":"24e76c30fa68567a473737617b9a05a74c2cf31bdd511a86dcf149709e4896ad","schema_version":"1.0","event_id":"sha256:24e76c30fa68567a473737617b9a05a74c2cf31bdd511a86dcf149709e4896ad"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:XTI6OTX3FMNNJYXQHYJIFJ3OXG","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Island of acoustic black hole in Schwarzschild spacetime","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["gr-qc"],"primary_cat":"hep-th","authors_text":"Jia-Rui Sun, Yu-Ye Cheng","submitted_at":"2025-12-10T09:29:15Z","abstract_excerpt":"We study an analogue information paradox in acoustic black holes which are emerged from the superfluid surrounding a Schwarzschild black hole. The resulting acoustic black hole contains both acoustic horizons and optical horizon, with analogue Hawking radiation, i.e. phonons, emitted from the outer acoustic horizon. By using the island formula, we calculate the entanglement entropy of analogue Hawking radiation of the acoustic black hole in both non-extremal and extremal cases. In the non-extremal case, the entanglement entropy of phonons follow the Page curve due to the emergence of islands, "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2512.09460","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2512.09460/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-06-30T02:17:12Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"no0h0OqpsAU0j43VyuIim2K5x1fSBv6UcpqfwTP/THcyrmghSBqreqrw3jDIim+znyX6oD/41i3yKoCj4cFSBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-10T21:08:43.325103Z"},"content_sha256":"fa66ae28dbb3d594fb4a4b46a51d2a9a409916a344e47ced5b0189fc56e32648","schema_version":"1.0","event_id":"sha256:fa66ae28dbb3d594fb4a4b46a51d2a9a409916a344e47ced5b0189fc56e32648"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XTI6OTX3FMNNJYXQHYJIFJ3OXG/bundle.json","state_url":"https://pith.science/pith/XTI6OTX3FMNNJYXQHYJIFJ3OXG/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XTI6OTX3FMNNJYXQHYJIFJ3OXG/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-08-10T21:08:43Z","links":{"resolver":"https://pith.science/pith/XTI6OTX3FMNNJYXQHYJIFJ3OXG","bundle":"https://pith.science/pith/XTI6OTX3FMNNJYXQHYJIFJ3OXG/bundle.json","state":"https://pith.science/pith/XTI6OTX3FMNNJYXQHYJIFJ3OXG/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XTI6OTX3FMNNJYXQHYJIFJ3OXG/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:XTI6OTX3FMNNJYXQHYJIFJ3OXG","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"c47bab28935018a8730bdb6bde55aaf7ee09d9ea0eacbdec0ef2758e458fb5eb","cross_cats_sorted":["gr-qc"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-th","submitted_at":"2025-12-10T09:29:15Z","title_canon_sha256":"fee50cf8cf40662601976f1d1be20600057d688beb07b30425c66631f153995c"},"schema_version":"1.0","source":{"id":"2512.09460","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2512.09460","created_at":"2026-06-30T02:17:12Z"},{"alias_kind":"arxiv_version","alias_value":"2512.09460v2","created_at":"2026-06-30T02:17:12Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2512.09460","created_at":"2026-06-30T02:17:12Z"},{"alias_kind":"pith_short_12","alias_value":"XTI6OTX3FMNN","created_at":"2026-06-30T02:17:12Z"},{"alias_kind":"pith_short_16","alias_value":"XTI6OTX3FMNNJYXQ","created_at":"2026-06-30T02:17:12Z"},{"alias_kind":"pith_short_8","alias_value":"XTI6OTX3","created_at":"2026-06-30T02:17:12Z"}],"graph_snapshots":[{"event_id":"sha256:fa66ae28dbb3d594fb4a4b46a51d2a9a409916a344e47ced5b0189fc56e32648","target":"graph","created_at":"2026-06-30T02:17:12Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2512.09460/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We study an analogue information paradox in acoustic black holes which are emerged from the superfluid surrounding a Schwarzschild black hole. The resulting acoustic black hole contains both acoustic horizons and optical horizon, with analogue Hawking radiation, i.e. phonons, emitted from the outer acoustic horizon. By using the island formula, we calculate the entanglement entropy of analogue Hawking radiation of the acoustic black hole in both non-extremal and extremal cases. In the non-extremal case, the entanglement entropy of phonons follow the Page curve due to the emergence of islands, ","authors_text":"Jia-Rui Sun, Yu-Ye Cheng","cross_cats":["gr-qc"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-th","submitted_at":"2025-12-10T09:29:15Z","title":"Island of acoustic black hole in Schwarzschild spacetime"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2512.09460","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:24e76c30fa68567a473737617b9a05a74c2cf31bdd511a86dcf149709e4896ad","target":"record","created_at":"2026-06-30T02:17:12Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"c47bab28935018a8730bdb6bde55aaf7ee09d9ea0eacbdec0ef2758e458fb5eb","cross_cats_sorted":["gr-qc"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-th","submitted_at":"2025-12-10T09:29:15Z","title_canon_sha256":"fee50cf8cf40662601976f1d1be20600057d688beb07b30425c66631f153995c"},"schema_version":"1.0","source":{"id":"2512.09460","kind":"arxiv","version":2}},"canonical_sha256":"bcd1e74efb2b1ad4e2f03e1282a76eb9a9b86654396c18e752f37f29e85c47c4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bcd1e74efb2b1ad4e2f03e1282a76eb9a9b86654396c18e752f37f29e85c47c4","first_computed_at":"2026-06-30T02:17:12.773932Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-06-30T02:17:12.773932Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"HlZblo+gyhKfXONjBp+dKS9XHz+oudyPalPqmKXwnWRyFch8KNR2OSP7FEJ01MUVYSk9/sE5rYoB45PAfMDSCw==","signature_status":"signed_v1","signed_at":"2026-06-30T02:17:12.774687Z","signed_message":"canonical_sha256_bytes"},"source_id":"2512.09460","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:24e76c30fa68567a473737617b9a05a74c2cf31bdd511a86dcf149709e4896ad","sha256:fa66ae28dbb3d594fb4a4b46a51d2a9a409916a344e47ced5b0189fc56e32648"],"state_sha256":"9ab675ef604837f366685f83c7139144d6afed4b01f3a4f26bc44846d6516e4e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"HO6Ew9hXvLlAh3tEZT8CTzZoyFh76OD7TjNU2t3YnrDYAhUu3TRfNMB+WCSk3xEbjVukfdKjPmfRTaCdh+76BA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-10T21:08:43.330030Z","bundle_sha256":"5b1f3a9109b85dd3f929ab4e28432605a0964f52f56993e2d12176650d1c531f"}}