{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2015:UM6YCZOBX55TGPSXC5Z6PX2JLT","short_pith_number":"pith:UM6YCZOB","schema_version":"1.0","canonical_sha256":"a33d8165c1bf7b333e571773e7df495cdf332af102d825a96f3790f017fc0b7a","source":{"kind":"arxiv","id":"1501.01637","version":2},"attestation_state":"computed","paper":{"title":"Quasi-normal acoustic oscillations in the Michel flow","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"gr-qc","authors_text":"Eliana Chaverra, Manuel D. Morales, Olivier Sarbach","submitted_at":"2015-01-07T21:00:12Z","abstract_excerpt":"We study spherical and nonspherical linear acoustic perturbations of the Michel flow, which describes the steady radial accretion of a perfect fluid into a nonrotating black hole. The dynamics of such perturbations are governed by a scalar wave equation on an effective curved background geometry determined by the acoustic metric, which is constructed from the spacetime metric and the particle density and four-velocity of the fluid. For the problem under consideration in this article the acoustic metric has the same qualitative features as an asymptotically flat, static and spherically symmetri"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1501.01637","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2015-01-07T21:00:12Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"563914068a50435bad9753e9680045b50b6519be9587aa4957d1d5804fd97507","abstract_canon_sha256":"d5673a40ef28edf0b6821634b8a4cc35e5e9f1f7f1de04ea98c84a3d5cee58ea"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:55:42.400228Z","signature_b64":"fco8JdQ3rGQNgseqtxE7f7BqJCQwCysJd5R9O0FnfK6L4kyrizk8jKqZvW6foVQfD9/OKwCDt1cjFH7Ui8JnDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a33d8165c1bf7b333e571773e7df495cdf332af102d825a96f3790f017fc0b7a","last_reissued_at":"2026-05-18T01:55:42.399500Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:55:42.399500Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Quasi-normal acoustic oscillations in the Michel flow","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"gr-qc","authors_text":"Eliana Chaverra, Manuel D. Morales, Olivier Sarbach","submitted_at":"2015-01-07T21:00:12Z","abstract_excerpt":"We study spherical and nonspherical linear acoustic perturbations of the Michel flow, which describes the steady radial accretion of a perfect fluid into a nonrotating black hole. The dynamics of such perturbations are governed by a scalar wave equation on an effective curved background geometry determined by the acoustic metric, which is constructed from the spacetime metric and the particle density and four-velocity of the fluid. For the problem under consideration in this article the acoustic metric has the same qualitative features as an asymptotically flat, static and spherically symmetri"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1501.01637","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1501.01637","created_at":"2026-05-18T01:55:42.399627+00:00"},{"alias_kind":"arxiv_version","alias_value":"1501.01637v2","created_at":"2026-05-18T01:55:42.399627+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1501.01637","created_at":"2026-05-18T01:55:42.399627+00:00"},{"alias_kind":"pith_short_12","alias_value":"UM6YCZOBX55T","created_at":"2026-05-18T12:29:44.643036+00:00"},{"alias_kind":"pith_short_16","alias_value":"UM6YCZOBX55TGPSX","created_at":"2026-05-18T12:29:44.643036+00:00"},{"alias_kind":"pith_short_8","alias_value":"UM6YCZOB","created_at":"2026-05-18T12:29:44.643036+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/UM6YCZOBX55TGPSXC5Z6PX2JLT","json":"https://pith.science/pith/UM6YCZOBX55TGPSXC5Z6PX2JLT.json","graph_json":"https://pith.science/api/pith-number/UM6YCZOBX55TGPSXC5Z6PX2JLT/graph.json","events_json":"https://pith.science/api/pith-number/UM6YCZOBX55TGPSXC5Z6PX2JLT/events.json","paper":"https://pith.science/paper/UM6YCZOB"},"agent_actions":{"view_html":"https://pith.science/pith/UM6YCZOBX55TGPSXC5Z6PX2JLT","download_json":"https://pith.science/pith/UM6YCZOBX55TGPSXC5Z6PX2JLT.json","view_paper":"https://pith.science/paper/UM6YCZOB","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1501.01637&json=true","fetch_graph":"https://pith.science/api/pith-number/UM6YCZOBX55TGPSXC5Z6PX2JLT/graph.json","fetch_events":"https://pith.science/api/pith-number/UM6YCZOBX55TGPSXC5Z6PX2JLT/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/UM6YCZOBX55TGPSXC5Z6PX2JLT/action/timestamp_anchor","attest_storage":"https://pith.science/pith/UM6YCZOBX55TGPSXC5Z6PX2JLT/action/storage_attestation","attest_author":"https://pith.science/pith/UM6YCZOBX55TGPSXC5Z6PX2JLT/action/author_attestation","sign_citation":"https://pith.science/pith/UM6YCZOBX55TGPSXC5Z6PX2JLT/action/citation_signature","submit_replication":"https://pith.science/pith/UM6YCZOBX55TGPSXC5Z6PX2JLT/action/replication_record"}},"created_at":"2026-05-18T01:55:42.399627+00:00","updated_at":"2026-05-18T01:55:42.399627+00:00"}