{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2019:Y3QPPF7PONURGE7MDVRA6ALKAA","short_pith_number":"pith:Y3QPPF7P","schema_version":"1.0","canonical_sha256":"c6e0f797ef73691313ec1d620f016a003c52432477b5d2f0e1f7d0d347c98ef6","source":{"kind":"arxiv","id":"1905.13235","version":1},"attestation_state":"computed","paper":{"title":"Ultra-diffuse galaxies without dark matter","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO","hep-ph"],"primary_cat":"astro-ph.GA","authors_text":"Joseph Silk","submitted_at":"2019-05-30T18:00:02Z","abstract_excerpt":"I develop a high velocity galaxy collision model to explain a rare but puzzling phenomenon, namely the apparent existence of ultra-diffuse galaxies with little dark matter. Predictions include simultaneous triggering of overpressured dense clouds to form luminous old globular clusters, a protogroup environment to generate high relative velocities of the initially gas-rich galaxies in the early universe, and spatially separated dark halos, possibly detectable via gravitational lensing and containing relic low metallicity stars with enhanced [alpha/Fe] at ultralow surface brightness."},"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":"1905.13235","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-05-30T18:00:02Z","cross_cats_sorted":["astro-ph.CO","hep-ph"],"title_canon_sha256":"7fdb685324573276cd80e40bae8bd5519974cb2844baf710bf4cb5b83fa5ba27","abstract_canon_sha256":"d185482220b9dd38ff67a6ba92c75ce59f5566ebe7c45bcf0e2e2decda17bcc1"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:41:08.114653Z","signature_b64":"q8vqDaTIRP9hpGLU9Bun+d93D5LKTEU4sEKIjBZgjfGe3XAzbQfMVzxmR5mcuIHKuxqZ8Ee6pOP9emXITyBtAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c6e0f797ef73691313ec1d620f016a003c52432477b5d2f0e1f7d0d347c98ef6","last_reissued_at":"2026-05-17T23:41:08.113946Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:41:08.113946Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Ultra-diffuse galaxies without dark matter","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO","hep-ph"],"primary_cat":"astro-ph.GA","authors_text":"Joseph Silk","submitted_at":"2019-05-30T18:00:02Z","abstract_excerpt":"I develop a high velocity galaxy collision model to explain a rare but puzzling phenomenon, namely the apparent existence of ultra-diffuse galaxies with little dark matter. Predictions include simultaneous triggering of overpressured dense clouds to form luminous old globular clusters, a protogroup environment to generate high relative velocities of the initially gas-rich galaxies in the early universe, and spatially separated dark halos, possibly detectable via gravitational lensing and containing relic low metallicity stars with enhanced [alpha/Fe] at ultralow surface brightness."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1905.13235","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":""},"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":"1905.13235","created_at":"2026-05-17T23:41:08.114057+00:00"},{"alias_kind":"arxiv_version","alias_value":"1905.13235v1","created_at":"2026-05-17T23:41:08.114057+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1905.13235","created_at":"2026-05-17T23:41:08.114057+00:00"},{"alias_kind":"pith_short_12","alias_value":"Y3QPPF7PONUR","created_at":"2026-05-18T12:33:33.725879+00:00"},{"alias_kind":"pith_short_16","alias_value":"Y3QPPF7PONURGE7M","created_at":"2026-05-18T12:33:33.725879+00:00"},{"alias_kind":"pith_short_8","alias_value":"Y3QPPF7P","created_at":"2026-05-18T12:33:33.725879+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":2,"internal_anchor_count":2,"sample":[{"citing_arxiv_id":"2606.30718","citing_title":"Tidal origin of dark-matter free dwarf galaxies in the NGC 1052 group","ref_index":43,"is_internal_anchor":true},{"citing_arxiv_id":"2605.21598","citing_title":"Advancing the detection of low surface brightness galaxies. I. ATTILA: multi-tAsking deTecTIon tool for Lsb gAlaxies","ref_index":102,"is_internal_anchor":true}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/Y3QPPF7PONURGE7MDVRA6ALKAA","json":"https://pith.science/pith/Y3QPPF7PONURGE7MDVRA6ALKAA.json","graph_json":"https://pith.science/api/pith-number/Y3QPPF7PONURGE7MDVRA6ALKAA/graph.json","events_json":"https://pith.science/api/pith-number/Y3QPPF7PONURGE7MDVRA6ALKAA/events.json","paper":"https://pith.science/paper/Y3QPPF7P"},"agent_actions":{"view_html":"https://pith.science/pith/Y3QPPF7PONURGE7MDVRA6ALKAA","download_json":"https://pith.science/pith/Y3QPPF7PONURGE7MDVRA6ALKAA.json","view_paper":"https://pith.science/paper/Y3QPPF7P","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1905.13235&json=true","fetch_graph":"https://pith.science/api/pith-number/Y3QPPF7PONURGE7MDVRA6ALKAA/graph.json","fetch_events":"https://pith.science/api/pith-number/Y3QPPF7PONURGE7MDVRA6ALKAA/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/Y3QPPF7PONURGE7MDVRA6ALKAA/action/timestamp_anchor","attest_storage":"https://pith.science/pith/Y3QPPF7PONURGE7MDVRA6ALKAA/action/storage_attestation","attest_author":"https://pith.science/pith/Y3QPPF7PONURGE7MDVRA6ALKAA/action/author_attestation","sign_citation":"https://pith.science/pith/Y3QPPF7PONURGE7MDVRA6ALKAA/action/citation_signature","submit_replication":"https://pith.science/pith/Y3QPPF7PONURGE7MDVRA6ALKAA/action/replication_record"}},"created_at":"2026-05-17T23:41:08.114057+00:00","updated_at":"2026-05-17T23:41:08.114057+00:00"}