{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:1994:6CN5XYCC2DIJG4LHYBTIZESYKF","short_pith_number":"pith:6CN5XYCC","schema_version":"1.0","canonical_sha256":"f09bdbe042d0d0937167c0668c9258517988113cf9f91ab9c1f043a099b33de1","source":{"kind":"arxiv","id":"astro-ph/9401016","version":2},"attestation_state":"computed","paper":{"title":"Origin of Quasar Progenitors from the Collapse of Low-Spin Cosmological Perturbations","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Abraham Loeb (Harvard Univ.), Daniel J. Eisenstein","submitted_at":"1994-01-11T18:56:30Z","abstract_excerpt":"We show that seeds for quasar black holes could have originated from the initial cosmological collapse of overdense regions with unusually small rotation. The gas in these rare regions collapses into a compact disk that shrinks on a short viscous time scale. Using an analytical model, we calculate the low-spin tail of the probability distribution of angular momenta for objects that collapse out of a Gaussian random field of initial density perturbations. The population of low-spin systems is significant for any viable power spectrum of primordial density perturbations. Most objects form just a"},"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/9401016","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1994-01-11T18:56:30Z","cross_cats_sorted":[],"title_canon_sha256":"6818aefe717a6797ebb9c8256d89a6c44f6fd8f48120dd501a0bcc51074b91b6","abstract_canon_sha256":"f8a92d23ce560f03e6243a0cd59470f7b5496152e5e572fb5df35f4ac492aefd"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T15:50:36.637510Z","signature_b64":"VCXVQ6aHK1A8HA2LyzVDqmmB4Z8F7Gmnn2KSPR94UrV472vQni3LzdAXZEKQadRHTpXzEOFRR8CYLdzbU9AQAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f09bdbe042d0d0937167c0668c9258517988113cf9f91ab9c1f043a099b33de1","last_reissued_at":"2026-07-04T15:50:36.637070Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T15:50:36.637070Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Origin of Quasar Progenitors from the Collapse of Low-Spin Cosmological Perturbations","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Abraham Loeb (Harvard Univ.), Daniel J. Eisenstein","submitted_at":"1994-01-11T18:56:30Z","abstract_excerpt":"We show that seeds for quasar black holes could have originated from the initial cosmological collapse of overdense regions with unusually small rotation. The gas in these rare regions collapses into a compact disk that shrinks on a short viscous time scale. Using an analytical model, we calculate the low-spin tail of the probability distribution of angular momenta for objects that collapse out of a Gaussian random field of initial density perturbations. The population of low-spin systems is significant for any viable power spectrum of primordial density perturbations. Most objects form just a"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9401016","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/astro-ph/9401016/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/9401016","created_at":"2026-07-04T15:50:36.637135+00:00"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9401016v2","created_at":"2026-07-04T15:50:36.637135+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9401016","created_at":"2026-07-04T15:50:36.637135+00:00"},{"alias_kind":"pith_short_12","alias_value":"6CN5XYCC2DIJ","created_at":"2026-07-04T15:50:36.637135+00:00"},{"alias_kind":"pith_short_16","alias_value":"6CN5XYCC2DIJG4LH","created_at":"2026-07-04T15:50:36.637135+00:00"},{"alias_kind":"pith_short_8","alias_value":"6CN5XYCC","created_at":"2026-07-04T15:50:36.637135+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":2,"internal_anchor_count":2,"sample":[{"citing_arxiv_id":"2606.27426","citing_title":"Too shy to spin? Cosmic wallflowers as proto-globular clusters","ref_index":71,"is_internal_anchor":true},{"citing_arxiv_id":"2606.00205","citing_title":"Ultraviolet diversity of Little Red Dots as a probe for direct-collapse black hole ages","ref_index":124,"is_internal_anchor":true}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/6CN5XYCC2DIJG4LHYBTIZESYKF","json":"https://pith.science/pith/6CN5XYCC2DIJG4LHYBTIZESYKF.json","graph_json":"https://pith.science/api/pith-number/6CN5XYCC2DIJG4LHYBTIZESYKF/graph.json","events_json":"https://pith.science/api/pith-number/6CN5XYCC2DIJG4LHYBTIZESYKF/events.json","paper":"https://pith.science/paper/6CN5XYCC"},"agent_actions":{"view_html":"https://pith.science/pith/6CN5XYCC2DIJG4LHYBTIZESYKF","download_json":"https://pith.science/pith/6CN5XYCC2DIJG4LHYBTIZESYKF.json","view_paper":"https://pith.science/paper/6CN5XYCC","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=astro-ph/9401016&json=true","fetch_graph":"https://pith.science/api/pith-number/6CN5XYCC2DIJG4LHYBTIZESYKF/graph.json","fetch_events":"https://pith.science/api/pith-number/6CN5XYCC2DIJG4LHYBTIZESYKF/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/6CN5XYCC2DIJG4LHYBTIZESYKF/action/timestamp_anchor","attest_storage":"https://pith.science/pith/6CN5XYCC2DIJG4LHYBTIZESYKF/action/storage_attestation","attest_author":"https://pith.science/pith/6CN5XYCC2DIJG4LHYBTIZESYKF/action/author_attestation","sign_citation":"https://pith.science/pith/6CN5XYCC2DIJG4LHYBTIZESYKF/action/citation_signature","submit_replication":"https://pith.science/pith/6CN5XYCC2DIJG4LHYBTIZESYKF/action/replication_record"}},"created_at":"2026-07-04T15:50:36.637135+00:00","updated_at":"2026-07-04T15:50:36.637135+00:00"}