{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2000:5Z2VOXQHTTZUD4V5M2NGTJSHZQ","short_pith_number":"pith:5Z2VOXQH","schema_version":"1.0","canonical_sha256":"ee75575e079cf341f2bd669a69a647cc2d5a68c5d0b7d611226653ae142f74d3","source":{"kind":"arxiv","id":"astro-ph/0009193","version":1},"attestation_state":"computed","paper":{"title":"Entropic-Acoustic instability in shocked accretion flows","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"M. Tagger (CEA-Saclay), T. Foglizzo","submitted_at":"2000-09-13T09:02:05Z","abstract_excerpt":"A new instability mechanism is described in accretion flows where the gas is accelerated from a stationary shock to a sonic surface. The instability is based on a cycle of acoustic and entropic waves in this subsonic region of the flow. When advected adiabatically inward, entropy perturbations trigger acoustic waves propagating outward. If a shock is present at the outer boundary, acoustic waves reaching the shock produce new entropy perturbations, thus creating an entropic-acoustic cycle between the shock and the sonic surface. The interplay of acoustic and entropy perturbations is estimated "},"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":"astro-ph/0009193","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2000-09-13T09:02:05Z","cross_cats_sorted":[],"title_canon_sha256":"7fbc4fbf687403fcb12b57408788f505f238c8067f9c7daa2842348445b0235f","abstract_canon_sha256":"dca05aeff1022df73b9061d36204eb1f63f3aaba9a5be88bc29f0cfb7b59ecf2"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T14:10:43.095808Z","signature_b64":"KzZ4O4rDWusgIMUCMT5s50FcPxmTEfTUiqLWwVXtokqmjWv7D6wuoJJyjQFHlYB7eT34SJprjHFTQU6P6XF7AQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ee75575e079cf341f2bd669a69a647cc2d5a68c5d0b7d611226653ae142f74d3","last_reissued_at":"2026-07-04T14:10:43.095464Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T14:10:43.095464Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Entropic-Acoustic instability in shocked accretion flows","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"M. Tagger (CEA-Saclay), T. Foglizzo","submitted_at":"2000-09-13T09:02:05Z","abstract_excerpt":"A new instability mechanism is described in accretion flows where the gas is accelerated from a stationary shock to a sonic surface. The instability is based on a cycle of acoustic and entropic waves in this subsonic region of the flow. When advected adiabatically inward, entropy perturbations trigger acoustic waves propagating outward. If a shock is present at the outer boundary, acoustic waves reaching the shock produce new entropy perturbations, thus creating an entropic-acoustic cycle between the shock and the sonic surface. The interplay of acoustic and entropy perturbations is estimated "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0009193","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/astro-ph/0009193/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"astro-ph/0009193","created_at":"2026-07-04T14:10:43.095519+00:00"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0009193v1","created_at":"2026-07-04T14:10:43.095519+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0009193","created_at":"2026-07-04T14:10:43.095519+00:00"},{"alias_kind":"pith_short_12","alias_value":"5Z2VOXQHTTZU","created_at":"2026-07-04T14:10:43.095519+00:00"},{"alias_kind":"pith_short_16","alias_value":"5Z2VOXQHTTZUD4V5","created_at":"2026-07-04T14:10:43.095519+00:00"},{"alias_kind":"pith_short_8","alias_value":"5Z2VOXQH","created_at":"2026-07-04T14:10:43.095519+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/5Z2VOXQHTTZUD4V5M2NGTJSHZQ","json":"https://pith.science/pith/5Z2VOXQHTTZUD4V5M2NGTJSHZQ.json","graph_json":"https://pith.science/api/pith-number/5Z2VOXQHTTZUD4V5M2NGTJSHZQ/graph.json","events_json":"https://pith.science/api/pith-number/5Z2VOXQHTTZUD4V5M2NGTJSHZQ/events.json","paper":"https://pith.science/paper/5Z2VOXQH"},"agent_actions":{"view_html":"https://pith.science/pith/5Z2VOXQHTTZUD4V5M2NGTJSHZQ","download_json":"https://pith.science/pith/5Z2VOXQHTTZUD4V5M2NGTJSHZQ.json","view_paper":"https://pith.science/paper/5Z2VOXQH","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=astro-ph/0009193&json=true","fetch_graph":"https://pith.science/api/pith-number/5Z2VOXQHTTZUD4V5M2NGTJSHZQ/graph.json","fetch_events":"https://pith.science/api/pith-number/5Z2VOXQHTTZUD4V5M2NGTJSHZQ/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/5Z2VOXQHTTZUD4V5M2NGTJSHZQ/action/timestamp_anchor","attest_storage":"https://pith.science/pith/5Z2VOXQHTTZUD4V5M2NGTJSHZQ/action/storage_attestation","attest_author":"https://pith.science/pith/5Z2VOXQHTTZUD4V5M2NGTJSHZQ/action/author_attestation","sign_citation":"https://pith.science/pith/5Z2VOXQHTTZUD4V5M2NGTJSHZQ/action/citation_signature","submit_replication":"https://pith.science/pith/5Z2VOXQHTTZUD4V5M2NGTJSHZQ/action/replication_record"}},"created_at":"2026-07-04T14:10:43.095519+00:00","updated_at":"2026-07-04T14:10:43.095519+00:00"}