{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2019:7RS5E2XMCRXHA7U7LLBAS2BE52","short_pith_number":"pith:7RS5E2XM","schema_version":"1.0","canonical_sha256":"fc65d26aec146e707e9f5ac2096824eeb65ebee809d2e825fe43c2cffb0a0c13","source":{"kind":"arxiv","id":"1901.07120","version":2},"attestation_state":"computed","paper":{"title":"Constraints on Earth-mass primordial black holes from OGLE 5-year microlensing events","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Hiroko Niikura, Masahiro Takada, Shogo Masaki, Shuichiro Yokoyama, Takahiro Sumi","submitted_at":"2019-01-21T23:39:22Z","abstract_excerpt":"We constrain the abundance of primordial black holes (PBH) using 2622 microlensing events obtained from 5-years observations of stars in the Galactic bulge by the Optical Gravitational Lensing Experiment (OGLE). The majority of microlensing events display a single or at least continuous population that has a peak around the light curve timescale $t_{\\rm E}\\simeq 20~{\\rm days}$ and a wide distribution over the range $t_{\\rm E}\\simeq [1, 300]~{\\rm days}$, while the data also indicates a second population of 6 ultrashort-timescale events in $t_{\\rm E}\\simeq [0.1,0.3]~{\\rm days}$, which are advoca"},"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":"1901.07120","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2019-01-21T23:39:22Z","cross_cats_sorted":[],"title_canon_sha256":"2a5462c850824918edaef625cdc8c32492773420f1f0ec4f6915e2adce3b0e46","abstract_canon_sha256":"e599787ff99bf554c0c851681fccace981e865a7552876c4338cec89a9500c23"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:48:04.617000Z","signature_b64":"tVrbpVHma+yLuVvVlrPJuHNGI3F4SYqBkOeLoGw+B+ozAkYEsJZ5c9d+Y9nnhedb7gqUNacuZguiCAzLPNo1Aw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"fc65d26aec146e707e9f5ac2096824eeb65ebee809d2e825fe43c2cffb0a0c13","last_reissued_at":"2026-05-17T23:48:04.616627Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:48:04.616627Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Constraints on Earth-mass primordial black holes from OGLE 5-year microlensing events","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Hiroko Niikura, Masahiro Takada, Shogo Masaki, Shuichiro Yokoyama, Takahiro Sumi","submitted_at":"2019-01-21T23:39:22Z","abstract_excerpt":"We constrain the abundance of primordial black holes (PBH) using 2622 microlensing events obtained from 5-years observations of stars in the Galactic bulge by the Optical Gravitational Lensing Experiment (OGLE). The majority of microlensing events display a single or at least continuous population that has a peak around the light curve timescale $t_{\\rm E}\\simeq 20~{\\rm days}$ and a wide distribution over the range $t_{\\rm E}\\simeq [1, 300]~{\\rm days}$, while the data also indicates a second population of 6 ultrashort-timescale events in $t_{\\rm E}\\simeq [0.1,0.3]~{\\rm days}$, which are advoca"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.07120","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":"1901.07120","created_at":"2026-05-17T23:48:04.616688+00:00"},{"alias_kind":"arxiv_version","alias_value":"1901.07120v2","created_at":"2026-05-17T23:48:04.616688+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.07120","created_at":"2026-05-17T23:48:04.616688+00:00"},{"alias_kind":"pith_short_12","alias_value":"7RS5E2XMCRXH","created_at":"2026-05-18T12:33:12.712433+00:00"},{"alias_kind":"pith_short_16","alias_value":"7RS5E2XMCRXHA7U7","created_at":"2026-05-18T12:33:12.712433+00:00"},{"alias_kind":"pith_short_8","alias_value":"7RS5E2XM","created_at":"2026-05-18T12:33:12.712433+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":13,"internal_anchor_count":7,"sample":[{"citing_arxiv_id":"2504.17064","citing_title":"Imprints of energy injection by compact dark stars in the 21-cm signal","ref_index":16,"is_internal_anchor":true},{"citing_arxiv_id":"2508.09965","citing_title":"GW231123: A Possible Primordial Black Hole Origin","ref_index":110,"is_internal_anchor":true},{"citing_arxiv_id":"2006.02838","citing_title":"Primordial Black Holes as Dark Matter: Recent Developments","ref_index":167,"is_internal_anchor":true},{"citing_arxiv_id":"2602.15974","citing_title":"Stellar microlensing surveys as a probe of Primordial Black Holes: status and prospects","ref_index":117,"is_internal_anchor":true},{"citing_arxiv_id":"2602.22587","citing_title":"Shadows of Giants: Constraints on Stupendously Large Black Holes from Negative Sources against the Cosmic Microwave Background","ref_index":20,"is_internal_anchor":true},{"citing_arxiv_id":"2605.15197","citing_title":"Primordial Black Hole from Tensor-induced Density Fluctuation: First-order Phase Transitions and Domain Walls","ref_index":193,"is_internal_anchor":true},{"citing_arxiv_id":"2002.12778","citing_title":"Constraints on Primordial Black Holes","ref_index":286,"is_internal_anchor":true},{"citing_arxiv_id":"2605.10467","citing_title":"Axial Quasi-normal Modes of Admixed Neutron Stars","ref_index":12,"is_internal_anchor":false},{"citing_arxiv_id":"2604.25434","citing_title":"Microlensing of fast and slow compact objects","ref_index":46,"is_internal_anchor":false},{"citing_arxiv_id":"2604.22731","citing_title":"Precision Analysis for $\\boldsymbol{H_0}$ Using Upcoming Multi-band Gravitational Wave Observations","ref_index":71,"is_internal_anchor":false},{"citing_arxiv_id":"2604.14871","citing_title":"Microscopic primordial black holes as macroscopic dark matter from large extra dimensions","ref_index":93,"is_internal_anchor":false},{"citing_arxiv_id":"2604.16154","citing_title":"Probing Primordial Black Holes with upcoming Radio Telescopes: a case study for LOFAR2.0, FAST Core Array and BINGO","ref_index":37,"is_internal_anchor":false},{"citing_arxiv_id":"2604.17083","citing_title":"Dark ages bounds on non-accreting massive compact halo objects","ref_index":45,"is_internal_anchor":false}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/7RS5E2XMCRXHA7U7LLBAS2BE52","json":"https://pith.science/pith/7RS5E2XMCRXHA7U7LLBAS2BE52.json","graph_json":"https://pith.science/api/pith-number/7RS5E2XMCRXHA7U7LLBAS2BE52/graph.json","events_json":"https://pith.science/api/pith-number/7RS5E2XMCRXHA7U7LLBAS2BE52/events.json","paper":"https://pith.science/paper/7RS5E2XM"},"agent_actions":{"view_html":"https://pith.science/pith/7RS5E2XMCRXHA7U7LLBAS2BE52","download_json":"https://pith.science/pith/7RS5E2XMCRXHA7U7LLBAS2BE52.json","view_paper":"https://pith.science/paper/7RS5E2XM","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1901.07120&json=true","fetch_graph":"https://pith.science/api/pith-number/7RS5E2XMCRXHA7U7LLBAS2BE52/graph.json","fetch_events":"https://pith.science/api/pith-number/7RS5E2XMCRXHA7U7LLBAS2BE52/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/7RS5E2XMCRXHA7U7LLBAS2BE52/action/timestamp_anchor","attest_storage":"https://pith.science/pith/7RS5E2XMCRXHA7U7LLBAS2BE52/action/storage_attestation","attest_author":"https://pith.science/pith/7RS5E2XMCRXHA7U7LLBAS2BE52/action/author_attestation","sign_citation":"https://pith.science/pith/7RS5E2XMCRXHA7U7LLBAS2BE52/action/citation_signature","submit_replication":"https://pith.science/pith/7RS5E2XMCRXHA7U7LLBAS2BE52/action/replication_record"}},"created_at":"2026-05-17T23:48:04.616688+00:00","updated_at":"2026-05-17T23:48:04.616688+00:00"}