{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2009:NSM5AVG7EYKN2WJD3XHZAS4YVN","short_pith_number":"pith:NSM5AVG7","schema_version":"1.0","canonical_sha256":"6c99d054df2614dd5923ddcf904b98ab5e89f37b1c3a50b7d2835a238c6f785a","source":{"kind":"arxiv","id":"0912.2393","version":3},"attestation_state":"computed","paper":{"title":"A New Open-Source Code for Spherically-Symmetric Stellar Collapse to Neutron Stars and Black Holes","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.IM","astro-ph.SR","gr-qc"],"primary_cat":"astro-ph.HE","authors_text":"Caltech), Christian D. Ott (TAPIR, Evan O'Connor","submitted_at":"2009-12-14T20:59:55Z","abstract_excerpt":"We present the new open-source spherically-symmetric general-relativistic (GR) hydrodynamics code GR1D. It is based on the Eulerian formulation of GR hydrodynamics (GRHD) put forth by Romero-Ibanez-Gourgoulhon and employs radial-gauge, polar-slicing coordinates in which the 3+1 equations simplify substantially. We discretize the GRHD equations with a finite-volume scheme, employing piecewise-parabolic reconstruction and an approximate Riemann solver. GR1D is intended for the simulation of stellar collapse to neutron stars and black holes and will also serve as a testbed for modeling technology"},"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":"0912.2393","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2009-12-14T20:59:55Z","cross_cats_sorted":["astro-ph.IM","astro-ph.SR","gr-qc"],"title_canon_sha256":"d82a6db09255bcf439039dd8a64095a0ae884fd291cfcbb4662b4cc3854c1161","abstract_canon_sha256":"1dda6f0d805287d7b76e3fb2bc26f80d8b8213bc89ea3c8cb86bf4e68773fe69"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:24:45.750805Z","signature_b64":"CGnH5FVCPwHdApM/wD8XA9U78ZO9NfNKhHzsGXmCHTe+Q4M1DarcQ6dq3yri+fkfhPW9tKO7GEo3I00DdqFJAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6c99d054df2614dd5923ddcf904b98ab5e89f37b1c3a50b7d2835a238c6f785a","last_reissued_at":"2026-05-18T02:24:45.750211Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:24:45.750211Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"A New Open-Source Code for Spherically-Symmetric Stellar Collapse to Neutron Stars and Black Holes","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.IM","astro-ph.SR","gr-qc"],"primary_cat":"astro-ph.HE","authors_text":"Caltech), Christian D. Ott (TAPIR, Evan O'Connor","submitted_at":"2009-12-14T20:59:55Z","abstract_excerpt":"We present the new open-source spherically-symmetric general-relativistic (GR) hydrodynamics code GR1D. It is based on the Eulerian formulation of GR hydrodynamics (GRHD) put forth by Romero-Ibanez-Gourgoulhon and employs radial-gauge, polar-slicing coordinates in which the 3+1 equations simplify substantially. We discretize the GRHD equations with a finite-volume scheme, employing piecewise-parabolic reconstruction and an approximate Riemann solver. GR1D is intended for the simulation of stellar collapse to neutron stars and black holes and will also serve as a testbed for modeling technology"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0912.2393","kind":"arxiv","version":3},"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":"0912.2393","created_at":"2026-05-18T02:24:45.750304+00:00"},{"alias_kind":"arxiv_version","alias_value":"0912.2393v3","created_at":"2026-05-18T02:24:45.750304+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0912.2393","created_at":"2026-05-18T02:24:45.750304+00:00"},{"alias_kind":"pith_short_12","alias_value":"NSM5AVG7EYKN","created_at":"2026-05-18T12:26:00.592388+00:00"},{"alias_kind":"pith_short_16","alias_value":"NSM5AVG7EYKN2WJD","created_at":"2026-05-18T12:26:00.592388+00:00"},{"alias_kind":"pith_short_8","alias_value":"NSM5AVG7","created_at":"2026-05-18T12:26:00.592388+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":2,"internal_anchor_count":2,"sample":[{"citing_arxiv_id":"2605.16504","citing_title":"Neutrino Flavor Conversion Shapes the Rate of Failed Core-collapse Supernovae","ref_index":61,"is_internal_anchor":true},{"citing_arxiv_id":"2605.18972","citing_title":"Flavor Conversion Enhances or Suppresses Supernova Explodability Independent of the Progenitor Mass","ref_index":62,"is_internal_anchor":true}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/NSM5AVG7EYKN2WJD3XHZAS4YVN","json":"https://pith.science/pith/NSM5AVG7EYKN2WJD3XHZAS4YVN.json","graph_json":"https://pith.science/api/pith-number/NSM5AVG7EYKN2WJD3XHZAS4YVN/graph.json","events_json":"https://pith.science/api/pith-number/NSM5AVG7EYKN2WJD3XHZAS4YVN/events.json","paper":"https://pith.science/paper/NSM5AVG7"},"agent_actions":{"view_html":"https://pith.science/pith/NSM5AVG7EYKN2WJD3XHZAS4YVN","download_json":"https://pith.science/pith/NSM5AVG7EYKN2WJD3XHZAS4YVN.json","view_paper":"https://pith.science/paper/NSM5AVG7","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=0912.2393&json=true","fetch_graph":"https://pith.science/api/pith-number/NSM5AVG7EYKN2WJD3XHZAS4YVN/graph.json","fetch_events":"https://pith.science/api/pith-number/NSM5AVG7EYKN2WJD3XHZAS4YVN/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/NSM5AVG7EYKN2WJD3XHZAS4YVN/action/timestamp_anchor","attest_storage":"https://pith.science/pith/NSM5AVG7EYKN2WJD3XHZAS4YVN/action/storage_attestation","attest_author":"https://pith.science/pith/NSM5AVG7EYKN2WJD3XHZAS4YVN/action/author_attestation","sign_citation":"https://pith.science/pith/NSM5AVG7EYKN2WJD3XHZAS4YVN/action/citation_signature","submit_replication":"https://pith.science/pith/NSM5AVG7EYKN2WJD3XHZAS4YVN/action/replication_record"}},"created_at":"2026-05-18T02:24:45.750304+00:00","updated_at":"2026-05-18T02:24:45.750304+00:00"}