{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:QTDBYDCWQTHE456LWR5I5LLNP3","short_pith_number":"pith:QTDBYDCW","canonical_record":{"source":{"id":"1504.06583","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2015-04-24T17:57:02Z","cross_cats_sorted":[],"title_canon_sha256":"22f686000039209cca2676d72485affd4b9cefbddeec1bc3ce65e6d9aa72475a","abstract_canon_sha256":"40ceae9f1beaeef9d48e03da2abdf56a932d027d6c0b8ba4fe8af33a6f95e0b6"},"schema_version":"1.0"},"canonical_sha256":"84c61c0c5684ce4e77cbb47a8ead6d7ee1bf6708cb11779baf3df5a710dcdd34","source":{"kind":"arxiv","id":"1504.06583","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1504.06583","created_at":"2026-05-18T01:35:59Z"},{"alias_kind":"arxiv_version","alias_value":"1504.06583v3","created_at":"2026-05-18T01:35:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1504.06583","created_at":"2026-05-18T01:35:59Z"},{"alias_kind":"pith_short_12","alias_value":"QTDBYDCWQTHE","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_16","alias_value":"QTDBYDCWQTHE456L","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_8","alias_value":"QTDBYDCW","created_at":"2026-05-18T12:29:37Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:QTDBYDCWQTHE456LWR5I5LLNP3","target":"record","payload":{"canonical_record":{"source":{"id":"1504.06583","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2015-04-24T17:57:02Z","cross_cats_sorted":[],"title_canon_sha256":"22f686000039209cca2676d72485affd4b9cefbddeec1bc3ce65e6d9aa72475a","abstract_canon_sha256":"40ceae9f1beaeef9d48e03da2abdf56a932d027d6c0b8ba4fe8af33a6f95e0b6"},"schema_version":"1.0"},"canonical_sha256":"84c61c0c5684ce4e77cbb47a8ead6d7ee1bf6708cb11779baf3df5a710dcdd34","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:35:59.718424Z","signature_b64":"eirbC6l6/ujevAjXjMllq73mjR9t9IK8g9Zx7BfFnsHYd45ajA1UONzbAoLfzJheNzPQBSwyzTxlKWXZ4OMwDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"84c61c0c5684ce4e77cbb47a8ead6d7ee1bf6708cb11779baf3df5a710dcdd34","last_reissued_at":"2026-05-18T01:35:59.717744Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:35:59.717744Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1504.06583","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:35:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0gExTQQxHZMmG0uyhKknrqlusxBEGtGb2cSqKNMR7O0KrCWyM58hheDPG5y3SpBLEISNjYB5eLFKK3E2WY7sBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T18:53:40.494095Z"},"content_sha256":"0b4a1a459244ceb7f1dae4903f360a0beabb13437f95cbd56cabbbeae021ae24","schema_version":"1.0","event_id":"sha256:0b4a1a459244ceb7f1dae4903f360a0beabb13437f95cbd56cabbbeae021ae24"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:QTDBYDCWQTHE456LWR5I5LLNP3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Measuring the entanglement of analogue Hawking radiation by the density-density correlation function","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"gr-qc","authors_text":"Jeff Steinhauer","submitted_at":"2015-04-24T17:57:02Z","abstract_excerpt":"We theoretically study the entanglement of Hawking radiation pairs emitted by an analogue black hole. We find that this entanglement can be measured by the experimentally accessible density-density correlation function, vastly simplifying the measurement. We find that while the Hawking radiation exiting the black hole might be Planck-distributed, the correlations between the Hawking radiation and the partner particles has a distribution which is weaker but broader than Planckian. Thus, the high energy tail of the distribution of Hawking radiation should be entangled, whereas the low energy par"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1504.06583","kind":"arxiv","version":3},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"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":"2026-05-18T01:35:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mrrPcHxVZkJXkzxZwJxIREY2AP/rKUYD/Il5isXasW2DAamYRruYHPlTD0S7r9rzgPT7CvJeikmMIKE7Dk53BA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T18:53:40.494818Z"},"content_sha256":"85c74c121c3772b9ef499a420adbb8e701ebd798350b3515508bd2c2d1574759","schema_version":"1.0","event_id":"sha256:85c74c121c3772b9ef499a420adbb8e701ebd798350b3515508bd2c2d1574759"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/QTDBYDCWQTHE456LWR5I5LLNP3/bundle.json","state_url":"https://pith.science/pith/QTDBYDCWQTHE456LWR5I5LLNP3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/QTDBYDCWQTHE456LWR5I5LLNP3/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":"2026-05-25T18:53:40Z","links":{"resolver":"https://pith.science/pith/QTDBYDCWQTHE456LWR5I5LLNP3","bundle":"https://pith.science/pith/QTDBYDCWQTHE456LWR5I5LLNP3/bundle.json","state":"https://pith.science/pith/QTDBYDCWQTHE456LWR5I5LLNP3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/QTDBYDCWQTHE456LWR5I5LLNP3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:QTDBYDCWQTHE456LWR5I5LLNP3","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":"40ceae9f1beaeef9d48e03da2abdf56a932d027d6c0b8ba4fe8af33a6f95e0b6","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2015-04-24T17:57:02Z","title_canon_sha256":"22f686000039209cca2676d72485affd4b9cefbddeec1bc3ce65e6d9aa72475a"},"schema_version":"1.0","source":{"id":"1504.06583","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1504.06583","created_at":"2026-05-18T01:35:59Z"},{"alias_kind":"arxiv_version","alias_value":"1504.06583v3","created_at":"2026-05-18T01:35:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1504.06583","created_at":"2026-05-18T01:35:59Z"},{"alias_kind":"pith_short_12","alias_value":"QTDBYDCWQTHE","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_16","alias_value":"QTDBYDCWQTHE456L","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_8","alias_value":"QTDBYDCW","created_at":"2026-05-18T12:29:37Z"}],"graph_snapshots":[{"event_id":"sha256:85c74c121c3772b9ef499a420adbb8e701ebd798350b3515508bd2c2d1574759","target":"graph","created_at":"2026-05-18T01:35:59Z","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"},"paper":{"abstract_excerpt":"We theoretically study the entanglement of Hawking radiation pairs emitted by an analogue black hole. We find that this entanglement can be measured by the experimentally accessible density-density correlation function, vastly simplifying the measurement. We find that while the Hawking radiation exiting the black hole might be Planck-distributed, the correlations between the Hawking radiation and the partner particles has a distribution which is weaker but broader than Planckian. Thus, the high energy tail of the distribution of Hawking radiation should be entangled, whereas the low energy par","authors_text":"Jeff Steinhauer","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2015-04-24T17:57:02Z","title":"Measuring the entanglement of analogue Hawking radiation by the density-density correlation function"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1504.06583","kind":"arxiv","version":3},"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":"sha256:0b4a1a459244ceb7f1dae4903f360a0beabb13437f95cbd56cabbbeae021ae24","target":"record","created_at":"2026-05-18T01:35:59Z","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":"40ceae9f1beaeef9d48e03da2abdf56a932d027d6c0b8ba4fe8af33a6f95e0b6","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2015-04-24T17:57:02Z","title_canon_sha256":"22f686000039209cca2676d72485affd4b9cefbddeec1bc3ce65e6d9aa72475a"},"schema_version":"1.0","source":{"id":"1504.06583","kind":"arxiv","version":3}},"canonical_sha256":"84c61c0c5684ce4e77cbb47a8ead6d7ee1bf6708cb11779baf3df5a710dcdd34","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"84c61c0c5684ce4e77cbb47a8ead6d7ee1bf6708cb11779baf3df5a710dcdd34","first_computed_at":"2026-05-18T01:35:59.717744Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:35:59.717744Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"eirbC6l6/ujevAjXjMllq73mjR9t9IK8g9Zx7BfFnsHYd45ajA1UONzbAoLfzJheNzPQBSwyzTxlKWXZ4OMwDw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:35:59.718424Z","signed_message":"canonical_sha256_bytes"},"source_id":"1504.06583","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0b4a1a459244ceb7f1dae4903f360a0beabb13437f95cbd56cabbbeae021ae24","sha256:85c74c121c3772b9ef499a420adbb8e701ebd798350b3515508bd2c2d1574759"],"state_sha256":"35d7bcab74a740ca08400c125b44d2e5cca39eff76de85403bde3fa95c2006a5"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OU01Mt7UbxEWGpcZqS2eHuXcYe0BrhUSviXQpVvo+MJmb7EYktvk/SSVsnH97fwhdOVb9NzeOcJ0jnE4hyi9Ag==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T18:53:40.498339Z","bundle_sha256":"49e1b18cb1e3aca3de502bb7b24bb293bb787d663cc44410ee043499d3e20d1b"}}