{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:C6M57ETBQZXLMBVT6YUHRLZRME","short_pith_number":"pith:C6M57ETB","canonical_record":{"source":{"id":"1801.03840","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2018-01-11T16:02:54Z","cross_cats_sorted":["physics.flu-dyn"],"title_canon_sha256":"f2ab4b344dbe2d5362d2e748a90d3cf99bb526074247ada410efc995132efa43","abstract_canon_sha256":"848df6d20deb149d488cf53105990a99313f41a5d53323a12864dcdf653b7ab3"},"schema_version":"1.0"},"canonical_sha256":"1799df9261866eb606b3f62878af316130264e070e03a5ad834fe1a1a1a0ea0c","source":{"kind":"arxiv","id":"1801.03840","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1801.03840","created_at":"2026-05-18T00:17:59Z"},{"alias_kind":"arxiv_version","alias_value":"1801.03840v2","created_at":"2026-05-18T00:17:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1801.03840","created_at":"2026-05-18T00:17:59Z"},{"alias_kind":"pith_short_12","alias_value":"C6M57ETBQZXL","created_at":"2026-05-18T12:32:16Z"},{"alias_kind":"pith_short_16","alias_value":"C6M57ETBQZXLMBVT","created_at":"2026-05-18T12:32:16Z"},{"alias_kind":"pith_short_8","alias_value":"C6M57ETB","created_at":"2026-05-18T12:32:16Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:C6M57ETBQZXLMBVT6YUHRLZRME","target":"record","payload":{"canonical_record":{"source":{"id":"1801.03840","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2018-01-11T16:02:54Z","cross_cats_sorted":["physics.flu-dyn"],"title_canon_sha256":"f2ab4b344dbe2d5362d2e748a90d3cf99bb526074247ada410efc995132efa43","abstract_canon_sha256":"848df6d20deb149d488cf53105990a99313f41a5d53323a12864dcdf653b7ab3"},"schema_version":"1.0"},"canonical_sha256":"1799df9261866eb606b3f62878af316130264e070e03a5ad834fe1a1a1a0ea0c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:17:59.682023Z","signature_b64":"wM2/8HQkBIejUcO6QKW1eFGCDRRPlsVe/ZI7Af2YkbaM0pr2NFlJdfCdzKdm+NPK0SgvIVmy6E1uJKEZJ2j6BQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1799df9261866eb606b3f62878af316130264e070e03a5ad834fe1a1a1a0ea0c","last_reissued_at":"2026-05-18T00:17:59.681526Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:17:59.681526Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1801.03840","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":"2026-05-18T00:17:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3UH9u7v39iT8aBnvPwLGhJV1K+XWWZmLUNWZiViq1D8WpMfuVj0BdegxFjCLk8IpItq7pm/yXI6MZ+DEsxbXDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T08:47:22.881418Z"},"content_sha256":"f2a9867e6098bf60fb483f06cee8d67d2aa40767fba3c026942167da4a1c2f52","schema_version":"1.0","event_id":"sha256:f2a9867e6098bf60fb483f06cee8d67d2aa40767fba3c026942167da4a1c2f52"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:C6M57ETBQZXLMBVT6YUHRLZRME","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Gravity waves on modulated flows downstream from an obstacle: The transcritical case","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.flu-dyn"],"primary_cat":"gr-qc","authors_text":"Florent Michel, Renaud Parentani, Scott Robertson","submitted_at":"2018-01-11T16:02:54Z","abstract_excerpt":"Periodic spatial variations of some parameter arise in analogue gravity experiments aimed at detecting the analogue version of the Hawking effect in a white hole flow. Having the same spatial periodicity as low-frequency dispersive modes, they can induce resonances which significantly modify the scattering coefficients. This has been shown numerically in a previous work [X. Busch et al., Phys. Rev. D 90, 105005 (2014)], but the precise dependence of the low-frequency effective temperature on the amplitude and length of the undulation remains elusive. In this article, using the Korteweg-de Vrie"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.03840","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":""},"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":"2026-05-18T00:17:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xrAx79nIjmHAgiyc//rgQYNwIFasM9vjJjB+qImiroJ0F2mWy3HuPlngfRQNeAHXAyJz1iC1qKUjybQlp/GQCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T08:47:22.882058Z"},"content_sha256":"ba1946a0e8269a297c835329a79500b4897c4c217a20403d7fa70ef19a9d1939","schema_version":"1.0","event_id":"sha256:ba1946a0e8269a297c835329a79500b4897c4c217a20403d7fa70ef19a9d1939"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/C6M57ETBQZXLMBVT6YUHRLZRME/bundle.json","state_url":"https://pith.science/pith/C6M57ETBQZXLMBVT6YUHRLZRME/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/C6M57ETBQZXLMBVT6YUHRLZRME/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":"2026-05-30T08:47:22Z","links":{"resolver":"https://pith.science/pith/C6M57ETBQZXLMBVT6YUHRLZRME","bundle":"https://pith.science/pith/C6M57ETBQZXLMBVT6YUHRLZRME/bundle.json","state":"https://pith.science/pith/C6M57ETBQZXLMBVT6YUHRLZRME/state.json","well_known_bundle":"https://pith.science/.well-known/pith/C6M57ETBQZXLMBVT6YUHRLZRME/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:C6M57ETBQZXLMBVT6YUHRLZRME","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":"848df6d20deb149d488cf53105990a99313f41a5d53323a12864dcdf653b7ab3","cross_cats_sorted":["physics.flu-dyn"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2018-01-11T16:02:54Z","title_canon_sha256":"f2ab4b344dbe2d5362d2e748a90d3cf99bb526074247ada410efc995132efa43"},"schema_version":"1.0","source":{"id":"1801.03840","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1801.03840","created_at":"2026-05-18T00:17:59Z"},{"alias_kind":"arxiv_version","alias_value":"1801.03840v2","created_at":"2026-05-18T00:17:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1801.03840","created_at":"2026-05-18T00:17:59Z"},{"alias_kind":"pith_short_12","alias_value":"C6M57ETBQZXL","created_at":"2026-05-18T12:32:16Z"},{"alias_kind":"pith_short_16","alias_value":"C6M57ETBQZXLMBVT","created_at":"2026-05-18T12:32:16Z"},{"alias_kind":"pith_short_8","alias_value":"C6M57ETB","created_at":"2026-05-18T12:32:16Z"}],"graph_snapshots":[{"event_id":"sha256:ba1946a0e8269a297c835329a79500b4897c4c217a20403d7fa70ef19a9d1939","target":"graph","created_at":"2026-05-18T00:17:59Z","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":"Periodic spatial variations of some parameter arise in analogue gravity experiments aimed at detecting the analogue version of the Hawking effect in a white hole flow. Having the same spatial periodicity as low-frequency dispersive modes, they can induce resonances which significantly modify the scattering coefficients. This has been shown numerically in a previous work [X. Busch et al., Phys. Rev. D 90, 105005 (2014)], but the precise dependence of the low-frequency effective temperature on the amplitude and length of the undulation remains elusive. In this article, using the Korteweg-de Vrie","authors_text":"Florent Michel, Renaud Parentani, Scott Robertson","cross_cats":["physics.flu-dyn"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2018-01-11T16:02:54Z","title":"Gravity waves on modulated flows downstream from an obstacle: The transcritical case"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.03840","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:f2a9867e6098bf60fb483f06cee8d67d2aa40767fba3c026942167da4a1c2f52","target":"record","created_at":"2026-05-18T00:17:59Z","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":"848df6d20deb149d488cf53105990a99313f41a5d53323a12864dcdf653b7ab3","cross_cats_sorted":["physics.flu-dyn"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2018-01-11T16:02:54Z","title_canon_sha256":"f2ab4b344dbe2d5362d2e748a90d3cf99bb526074247ada410efc995132efa43"},"schema_version":"1.0","source":{"id":"1801.03840","kind":"arxiv","version":2}},"canonical_sha256":"1799df9261866eb606b3f62878af316130264e070e03a5ad834fe1a1a1a0ea0c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1799df9261866eb606b3f62878af316130264e070e03a5ad834fe1a1a1a0ea0c","first_computed_at":"2026-05-18T00:17:59.681526Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:17:59.681526Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"wM2/8HQkBIejUcO6QKW1eFGCDRRPlsVe/ZI7Af2YkbaM0pr2NFlJdfCdzKdm+NPK0SgvIVmy6E1uJKEZJ2j6BQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:17:59.682023Z","signed_message":"canonical_sha256_bytes"},"source_id":"1801.03840","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f2a9867e6098bf60fb483f06cee8d67d2aa40767fba3c026942167da4a1c2f52","sha256:ba1946a0e8269a297c835329a79500b4897c4c217a20403d7fa70ef19a9d1939"],"state_sha256":"7dbff18c84538bd2e1e99e0f27d7a5e14f8eeed15a571afdd01147bbf764e392"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZKXV19OU479H3SAPJioNuEvMxUrd2zIin78bj14xWU7h3Dibn8egbfEqtjQxZc/abtlFW9qX7u+Q9XRIMEzLCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T08:47:22.885678Z","bundle_sha256":"4a29fae910632f84e52f4372825c9104504840b28b4595a3393ee32937776a44"}}