{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:NIT5KYJIZRA5B6F4MI4BWZLJ2W","short_pith_number":"pith:NIT5KYJI","canonical_record":{"source":{"id":"1305.7134","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2013-05-30T15:16:01Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"35fd942dfcbc793f300cc6be6dc6dae6ee57be194b35e41df44c6ab7515d1684","abstract_canon_sha256":"0d54b500feb2ff7f0df05c4cbf76cb42208c7eff546a2a3302d79f5781368cf8"},"schema_version":"1.0"},"canonical_sha256":"6a27d56128cc41d0f8bc62381b6569d5bc4459fe109dd3943c694c4297f0ecdb","source":{"kind":"arxiv","id":"1305.7134","version":4},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1305.7134","created_at":"2026-05-18T01:41:00Z"},{"alias_kind":"arxiv_version","alias_value":"1305.7134v4","created_at":"2026-05-18T01:41:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1305.7134","created_at":"2026-05-18T01:41:00Z"},{"alias_kind":"pith_short_12","alias_value":"NIT5KYJIZRA5","created_at":"2026-05-18T12:27:52Z"},{"alias_kind":"pith_short_16","alias_value":"NIT5KYJIZRA5B6F4","created_at":"2026-05-18T12:27:52Z"},{"alias_kind":"pith_short_8","alias_value":"NIT5KYJI","created_at":"2026-05-18T12:27:52Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:NIT5KYJIZRA5B6F4MI4BWZLJ2W","target":"record","payload":{"canonical_record":{"source":{"id":"1305.7134","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2013-05-30T15:16:01Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"35fd942dfcbc793f300cc6be6dc6dae6ee57be194b35e41df44c6ab7515d1684","abstract_canon_sha256":"0d54b500feb2ff7f0df05c4cbf76cb42208c7eff546a2a3302d79f5781368cf8"},"schema_version":"1.0"},"canonical_sha256":"6a27d56128cc41d0f8bc62381b6569d5bc4459fe109dd3943c694c4297f0ecdb","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:41:00.301578Z","signature_b64":"XPsg5M2mS8Vi3okccyFmN5CF7P3hKEol3IGuz4GQhNhmJ3250JuAAVXCuzRBYAee0BW2dBfjU5UwEqB1jR3ABA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6a27d56128cc41d0f8bc62381b6569d5bc4459fe109dd3943c694c4297f0ecdb","last_reissued_at":"2026-05-18T01:41:00.300925Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:41:00.300925Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1305.7134","source_version":4,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:41:00Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XY9uY7+67TlZNu5L8qTWq8JRowtsbVdHBfQWQi4HT3Fe8weienIzCL5rOANDASF5FOrHByZ/BFoGbTYvW6uOCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T16:56:30.117402Z"},"content_sha256":"c9294402c8eec6d3b5e97dcdd83d2016986aa5d92a2aa81f086cacfd1ab91ad7","schema_version":"1.0","event_id":"sha256:c9294402c8eec6d3b5e97dcdd83d2016986aa5d92a2aa81f086cacfd1ab91ad7"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:NIT5KYJIZRA5B6F4MI4BWZLJ2W","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Dependence of acoustic surface gravity on geometric configuration of matter for axially symmetric background flows in the Schwarzschild metric ~","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE"],"primary_cat":"gr-qc","authors_text":"Pratik Tarafdar, Tapas K Das","submitted_at":"2013-05-30T15:16:01Z","abstract_excerpt":"In black hole evaporation process, the mass of the hole anti-correlates with the Hawking temperature. This indicates that the smaller holes have higher surface gravity. For analogue Hawking effects, however, the acoustic surface gravity is determined by the local values of the dynamical velocity of the stationary background fluid flow and the speed of propagation of the characteristic perturbation embedded in the background fluid, as well as by their space derivatives evaluated along the direction normal to the acoustic horizon, respectively. The mass of the analogue system - whether classical"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1305.7134","kind":"arxiv","version":4},"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":"2026-05-18T01:41:00Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+z5TdspRSXX1VGSAIjPppcdS5Jc0YwpErr/GPP8cRXcQCNVwDwwHp973zbtdjHwKCIj62ovXtQvg64I79AZmCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T16:56:30.117771Z"},"content_sha256":"f1d380c48a7ed7cec2b26910962f8b48643fb5094d9169947bb76106cc5e15b4","schema_version":"1.0","event_id":"sha256:f1d380c48a7ed7cec2b26910962f8b48643fb5094d9169947bb76106cc5e15b4"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/NIT5KYJIZRA5B6F4MI4BWZLJ2W/bundle.json","state_url":"https://pith.science/pith/NIT5KYJIZRA5B6F4MI4BWZLJ2W/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/NIT5KYJIZRA5B6F4MI4BWZLJ2W/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":"2026-05-28T16:56:30Z","links":{"resolver":"https://pith.science/pith/NIT5KYJIZRA5B6F4MI4BWZLJ2W","bundle":"https://pith.science/pith/NIT5KYJIZRA5B6F4MI4BWZLJ2W/bundle.json","state":"https://pith.science/pith/NIT5KYJIZRA5B6F4MI4BWZLJ2W/state.json","well_known_bundle":"https://pith.science/.well-known/pith/NIT5KYJIZRA5B6F4MI4BWZLJ2W/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:NIT5KYJIZRA5B6F4MI4BWZLJ2W","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":"0d54b500feb2ff7f0df05c4cbf76cb42208c7eff546a2a3302d79f5781368cf8","cross_cats_sorted":["astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2013-05-30T15:16:01Z","title_canon_sha256":"35fd942dfcbc793f300cc6be6dc6dae6ee57be194b35e41df44c6ab7515d1684"},"schema_version":"1.0","source":{"id":"1305.7134","kind":"arxiv","version":4}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1305.7134","created_at":"2026-05-18T01:41:00Z"},{"alias_kind":"arxiv_version","alias_value":"1305.7134v4","created_at":"2026-05-18T01:41:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1305.7134","created_at":"2026-05-18T01:41:00Z"},{"alias_kind":"pith_short_12","alias_value":"NIT5KYJIZRA5","created_at":"2026-05-18T12:27:52Z"},{"alias_kind":"pith_short_16","alias_value":"NIT5KYJIZRA5B6F4","created_at":"2026-05-18T12:27:52Z"},{"alias_kind":"pith_short_8","alias_value":"NIT5KYJI","created_at":"2026-05-18T12:27:52Z"}],"graph_snapshots":[{"event_id":"sha256:f1d380c48a7ed7cec2b26910962f8b48643fb5094d9169947bb76106cc5e15b4","target":"graph","created_at":"2026-05-18T01:41:00Z","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":"In black hole evaporation process, the mass of the hole anti-correlates with the Hawking temperature. This indicates that the smaller holes have higher surface gravity. For analogue Hawking effects, however, the acoustic surface gravity is determined by the local values of the dynamical velocity of the stationary background fluid flow and the speed of propagation of the characteristic perturbation embedded in the background fluid, as well as by their space derivatives evaluated along the direction normal to the acoustic horizon, respectively. The mass of the analogue system - whether classical","authors_text":"Pratik Tarafdar, Tapas K Das","cross_cats":["astro-ph.HE"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2013-05-30T15:16:01Z","title":"Dependence of acoustic surface gravity on geometric configuration of matter for axially symmetric background flows in the Schwarzschild metric ~"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1305.7134","kind":"arxiv","version":4},"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:c9294402c8eec6d3b5e97dcdd83d2016986aa5d92a2aa81f086cacfd1ab91ad7","target":"record","created_at":"2026-05-18T01:41:00Z","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":"0d54b500feb2ff7f0df05c4cbf76cb42208c7eff546a2a3302d79f5781368cf8","cross_cats_sorted":["astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2013-05-30T15:16:01Z","title_canon_sha256":"35fd942dfcbc793f300cc6be6dc6dae6ee57be194b35e41df44c6ab7515d1684"},"schema_version":"1.0","source":{"id":"1305.7134","kind":"arxiv","version":4}},"canonical_sha256":"6a27d56128cc41d0f8bc62381b6569d5bc4459fe109dd3943c694c4297f0ecdb","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6a27d56128cc41d0f8bc62381b6569d5bc4459fe109dd3943c694c4297f0ecdb","first_computed_at":"2026-05-18T01:41:00.300925Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:41:00.300925Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"XPsg5M2mS8Vi3okccyFmN5CF7P3hKEol3IGuz4GQhNhmJ3250JuAAVXCuzRBYAee0BW2dBfjU5UwEqB1jR3ABA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:41:00.301578Z","signed_message":"canonical_sha256_bytes"},"source_id":"1305.7134","source_kind":"arxiv","source_version":4}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c9294402c8eec6d3b5e97dcdd83d2016986aa5d92a2aa81f086cacfd1ab91ad7","sha256:f1d380c48a7ed7cec2b26910962f8b48643fb5094d9169947bb76106cc5e15b4"],"state_sha256":"f448ddf30e22b8a132de52e368691cc285248d1a99681500428d980e1a0b08b8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9vdrWuBuIb3OmEZEMzHrrBu/x/hLmdplPvX9KTLl+PkGJo6yaGItPXc/t4XH7wWr7uCo7dcq5BTJG/akcooZBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T16:56:30.120413Z","bundle_sha256":"4271a0c6423a806d800f7838c31edfa007dce566b58679abc97062bf7365abf6"}}