{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2018:LPVSS4EXSOIJYJRNNXI3OBJPGR","short_pith_number":"pith:LPVSS4EX","schema_version":"1.0","canonical_sha256":"5beb29709793909c262d6dd1b7052f347a96ab684b908c0ffe12b23c916a3f95","source":{"kind":"arxiv","id":"1811.09589","version":2},"attestation_state":"computed","paper":{"title":"On the radial stability of ultra compact Schwarzschild stars beyond the Buchdahl limit","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"gr-qc","authors_text":"Camilo Posada, Cecilia Chirenti","submitted_at":"2018-11-23T18:26:05Z","abstract_excerpt":"In this paper we used the theory of adiabatic radial oscillations developed by Chandrasekhar to study the conditions for dynamical stability of constant energy-density stars, or Schwarzschild stars, in the unstudied ultra compact regime beyond the Buchdahl limit, that is, for configurations with radius $R$ in the range $R_{\\rm S}<R<(9/8)R_{\\rm S}$, where $R_{\\rm S}$ is the Schwarzschild radius of the star. These recently found analytical solutions exhibit a negative pressure region in their centre and, in the limit when $R\\to R_{\\rm S}$, the full interior region of the star becomes filled with"},"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":"1811.09589","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2018-11-23T18:26:05Z","cross_cats_sorted":[],"title_canon_sha256":"9179d94f363e6a172b551cf030ad8e8a8930d37fab1158a6ac3423d0777f2e0e","abstract_canon_sha256":"0bf04982d9bf937e5fc80a008c6a3a9e5da62942a409ea96f6dad89379c766aa"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:53:41.486284Z","signature_b64":"TElbkcDKqV0Xvk+Q4WN8HIS3P+1nLufjP2AncgZSUeCyqA1VHVb1IIXYo5iOBDRFlZn4/yhryCr47ABGJhKcDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5beb29709793909c262d6dd1b7052f347a96ab684b908c0ffe12b23c916a3f95","last_reissued_at":"2026-05-17T23:53:41.485812Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:53:41.485812Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"On the radial stability of ultra compact Schwarzschild stars beyond the Buchdahl limit","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"gr-qc","authors_text":"Camilo Posada, Cecilia Chirenti","submitted_at":"2018-11-23T18:26:05Z","abstract_excerpt":"In this paper we used the theory of adiabatic radial oscillations developed by Chandrasekhar to study the conditions for dynamical stability of constant energy-density stars, or Schwarzschild stars, in the unstudied ultra compact regime beyond the Buchdahl limit, that is, for configurations with radius $R$ in the range $R_{\\rm S}<R<(9/8)R_{\\rm S}$, where $R_{\\rm S}$ is the Schwarzschild radius of the star. These recently found analytical solutions exhibit a negative pressure region in their centre and, in the limit when $R\\to R_{\\rm S}$, the full interior region of the star becomes filled with"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1811.09589","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":"1811.09589","created_at":"2026-05-17T23:53:41.485886+00:00"},{"alias_kind":"arxiv_version","alias_value":"1811.09589v2","created_at":"2026-05-17T23:53:41.485886+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1811.09589","created_at":"2026-05-17T23:53:41.485886+00:00"},{"alias_kind":"pith_short_12","alias_value":"LPVSS4EXSOIJ","created_at":"2026-05-18T12:32:37.024351+00:00"},{"alias_kind":"pith_short_16","alias_value":"LPVSS4EXSOIJYJRN","created_at":"2026-05-18T12:32:37.024351+00:00"},{"alias_kind":"pith_short_8","alias_value":"LPVSS4EX","created_at":"2026-05-18T12:32:37.024351+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":0,"sample":[{"citing_arxiv_id":"1904.05363","citing_title":"Testing the nature of dark compact objects: a status report","ref_index":261,"is_internal_anchor":false}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/LPVSS4EXSOIJYJRNNXI3OBJPGR","json":"https://pith.science/pith/LPVSS4EXSOIJYJRNNXI3OBJPGR.json","graph_json":"https://pith.science/api/pith-number/LPVSS4EXSOIJYJRNNXI3OBJPGR/graph.json","events_json":"https://pith.science/api/pith-number/LPVSS4EXSOIJYJRNNXI3OBJPGR/events.json","paper":"https://pith.science/paper/LPVSS4EX"},"agent_actions":{"view_html":"https://pith.science/pith/LPVSS4EXSOIJYJRNNXI3OBJPGR","download_json":"https://pith.science/pith/LPVSS4EXSOIJYJRNNXI3OBJPGR.json","view_paper":"https://pith.science/paper/LPVSS4EX","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1811.09589&json=true","fetch_graph":"https://pith.science/api/pith-number/LPVSS4EXSOIJYJRNNXI3OBJPGR/graph.json","fetch_events":"https://pith.science/api/pith-number/LPVSS4EXSOIJYJRNNXI3OBJPGR/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/LPVSS4EXSOIJYJRNNXI3OBJPGR/action/timestamp_anchor","attest_storage":"https://pith.science/pith/LPVSS4EXSOIJYJRNNXI3OBJPGR/action/storage_attestation","attest_author":"https://pith.science/pith/LPVSS4EXSOIJYJRNNXI3OBJPGR/action/author_attestation","sign_citation":"https://pith.science/pith/LPVSS4EXSOIJYJRNNXI3OBJPGR/action/citation_signature","submit_replication":"https://pith.science/pith/LPVSS4EXSOIJYJRNNXI3OBJPGR/action/replication_record"}},"created_at":"2026-05-17T23:53:41.485886+00:00","updated_at":"2026-05-17T23:53:41.485886+00:00"}