{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:EVSGWYYXYIN2QMBQXDBMQBLF3G","short_pith_number":"pith:EVSGWYYX","canonical_record":{"source":{"id":"1302.0375","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2013-02-02T13:24:09Z","cross_cats_sorted":[],"title_canon_sha256":"f80d653c2f2d03fe45ed0f48f451f289324859d7ab1b82a0dbf386e20db241f5","abstract_canon_sha256":"0c0324d46ba4417fba7c946b3190df4009c223ad6b2d3791428866135a558c6b"},"schema_version":"1.0"},"canonical_sha256":"25646b6317c21ba83030b8c2c80565d9a4c5a2a89c7a723b8f4ae35356f1a8f8","source":{"kind":"arxiv","id":"1302.0375","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1302.0375","created_at":"2026-05-18T01:51:51Z"},{"alias_kind":"arxiv_version","alias_value":"1302.0375v1","created_at":"2026-05-18T01:51:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1302.0375","created_at":"2026-05-18T01:51:51Z"},{"alias_kind":"pith_short_12","alias_value":"EVSGWYYXYIN2","created_at":"2026-05-18T12:27:43Z"},{"alias_kind":"pith_short_16","alias_value":"EVSGWYYXYIN2QMBQ","created_at":"2026-05-18T12:27:43Z"},{"alias_kind":"pith_short_8","alias_value":"EVSGWYYX","created_at":"2026-05-18T12:27:43Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:EVSGWYYXYIN2QMBQXDBMQBLF3G","target":"record","payload":{"canonical_record":{"source":{"id":"1302.0375","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2013-02-02T13:24:09Z","cross_cats_sorted":[],"title_canon_sha256":"f80d653c2f2d03fe45ed0f48f451f289324859d7ab1b82a0dbf386e20db241f5","abstract_canon_sha256":"0c0324d46ba4417fba7c946b3190df4009c223ad6b2d3791428866135a558c6b"},"schema_version":"1.0"},"canonical_sha256":"25646b6317c21ba83030b8c2c80565d9a4c5a2a89c7a723b8f4ae35356f1a8f8","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:51:51.159358Z","signature_b64":"OyZVKimxLuJ1myNGCNvvtzi+7fCW7yyU1+Q6pwpxQC5gBi0+kG3tx12+/zVNI4/wV+GJji77GnIDJVK3hZmaBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"25646b6317c21ba83030b8c2c80565d9a4c5a2a89c7a723b8f4ae35356f1a8f8","last_reissued_at":"2026-05-18T01:51:51.158785Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:51:51.158785Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1302.0375","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:51:51Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zh/7IWpqBRl7TMn0LJoWEORiazPjzaIpyX/t0H95A1JU95hyL8rJo/asAO4AJOH9KKL3MN30D7o2hFBjrbNbAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T12:40:38.143975Z"},"content_sha256":"4a1850bfbb961e4ce30b4d49024e12599110f912f8bc95ee8de1996a4654fc89","schema_version":"1.0","event_id":"sha256:4a1850bfbb961e4ce30b4d49024e12599110f912f8bc95ee8de1996a4654fc89"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:EVSGWYYXYIN2QMBQXDBMQBLF3G","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Classical aspects of Hawking radiation verified in analogue gravity experiment","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"gr-qc","authors_text":"Edmund W. Tedford, Gregory A. Lawrence, Matthew C.J. Penrice, Silke Weinfurtner, William G. Unruh","submitted_at":"2013-02-02T13:24:09Z","abstract_excerpt":"There is an analogy between the propagation of fields on a curved spacetime and shallow water waves in an open channel flow. By placing a streamlined obstacle into an open channel flow we create a region of high velocity over the obstacle that can include wave horizons. Long (shallow water) waves propagating upstream towards this region are blocked and converted into short (deep water) waves. This is the analogue of the stimulated Hawking emission by a white hole (the time inverse of a black hole). The measurements of amplitudes of the converted waves demonstrate that they appear in pairs and "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1302.0375","kind":"arxiv","version":1},"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":"2026-05-18T01:51:51Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"CQFNY5v78aL7uipMFvWu3izkT1QGVlQfd26ktAv1pRvzROIM695rB6Ixpjf84D1V8sjsPBEjlRtDsn9xOO4bAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T12:40:38.144683Z"},"content_sha256":"411d38ab741fcdaa9086d6b19fcadc2ce1661dd263a73d1abbf78bc1194525e6","schema_version":"1.0","event_id":"sha256:411d38ab741fcdaa9086d6b19fcadc2ce1661dd263a73d1abbf78bc1194525e6"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/EVSGWYYXYIN2QMBQXDBMQBLF3G/bundle.json","state_url":"https://pith.science/pith/EVSGWYYXYIN2QMBQXDBMQBLF3G/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/EVSGWYYXYIN2QMBQXDBMQBLF3G/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":"2026-05-25T12:40:38Z","links":{"resolver":"https://pith.science/pith/EVSGWYYXYIN2QMBQXDBMQBLF3G","bundle":"https://pith.science/pith/EVSGWYYXYIN2QMBQXDBMQBLF3G/bundle.json","state":"https://pith.science/pith/EVSGWYYXYIN2QMBQXDBMQBLF3G/state.json","well_known_bundle":"https://pith.science/.well-known/pith/EVSGWYYXYIN2QMBQXDBMQBLF3G/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:EVSGWYYXYIN2QMBQXDBMQBLF3G","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":"0c0324d46ba4417fba7c946b3190df4009c223ad6b2d3791428866135a558c6b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2013-02-02T13:24:09Z","title_canon_sha256":"f80d653c2f2d03fe45ed0f48f451f289324859d7ab1b82a0dbf386e20db241f5"},"schema_version":"1.0","source":{"id":"1302.0375","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1302.0375","created_at":"2026-05-18T01:51:51Z"},{"alias_kind":"arxiv_version","alias_value":"1302.0375v1","created_at":"2026-05-18T01:51:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1302.0375","created_at":"2026-05-18T01:51:51Z"},{"alias_kind":"pith_short_12","alias_value":"EVSGWYYXYIN2","created_at":"2026-05-18T12:27:43Z"},{"alias_kind":"pith_short_16","alias_value":"EVSGWYYXYIN2QMBQ","created_at":"2026-05-18T12:27:43Z"},{"alias_kind":"pith_short_8","alias_value":"EVSGWYYX","created_at":"2026-05-18T12:27:43Z"}],"graph_snapshots":[{"event_id":"sha256:411d38ab741fcdaa9086d6b19fcadc2ce1661dd263a73d1abbf78bc1194525e6","target":"graph","created_at":"2026-05-18T01:51:51Z","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":"There is an analogy between the propagation of fields on a curved spacetime and shallow water waves in an open channel flow. By placing a streamlined obstacle into an open channel flow we create a region of high velocity over the obstacle that can include wave horizons. Long (shallow water) waves propagating upstream towards this region are blocked and converted into short (deep water) waves. This is the analogue of the stimulated Hawking emission by a white hole (the time inverse of a black hole). The measurements of amplitudes of the converted waves demonstrate that they appear in pairs and ","authors_text":"Edmund W. Tedford, Gregory A. Lawrence, Matthew C.J. Penrice, Silke Weinfurtner, William G. Unruh","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2013-02-02T13:24:09Z","title":"Classical aspects of Hawking radiation verified in analogue gravity experiment"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1302.0375","kind":"arxiv","version":1},"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":"sha256:4a1850bfbb961e4ce30b4d49024e12599110f912f8bc95ee8de1996a4654fc89","target":"record","created_at":"2026-05-18T01:51:51Z","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":"0c0324d46ba4417fba7c946b3190df4009c223ad6b2d3791428866135a558c6b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2013-02-02T13:24:09Z","title_canon_sha256":"f80d653c2f2d03fe45ed0f48f451f289324859d7ab1b82a0dbf386e20db241f5"},"schema_version":"1.0","source":{"id":"1302.0375","kind":"arxiv","version":1}},"canonical_sha256":"25646b6317c21ba83030b8c2c80565d9a4c5a2a89c7a723b8f4ae35356f1a8f8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"25646b6317c21ba83030b8c2c80565d9a4c5a2a89c7a723b8f4ae35356f1a8f8","first_computed_at":"2026-05-18T01:51:51.158785Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:51:51.158785Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"OyZVKimxLuJ1myNGCNvvtzi+7fCW7yyU1+Q6pwpxQC5gBi0+kG3tx12+/zVNI4/wV+GJji77GnIDJVK3hZmaBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:51:51.159358Z","signed_message":"canonical_sha256_bytes"},"source_id":"1302.0375","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4a1850bfbb961e4ce30b4d49024e12599110f912f8bc95ee8de1996a4654fc89","sha256:411d38ab741fcdaa9086d6b19fcadc2ce1661dd263a73d1abbf78bc1194525e6"],"state_sha256":"89238d726c8c6b098c8cf5b1c3b86bd1e9389c3acb12326294077223af0be578"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1o1lCYg2KtOJmUagapEZg5sHWTMsTqSgpGErD/9us0AZTPodegBQs3PHA870xhsMd7ga+uVNHNB8M1oNSlDRDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T12:40:38.148140Z","bundle_sha256":"91b1d701f4d38ec2756769ed3f5e178014b55c4ee283c8a507ee6a08f9a7ac04"}}