{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:3EK53UKJ46L6J2EDNVQ5FMVVEM","short_pith_number":"pith:3EK53UKJ","canonical_record":{"source":{"id":"1105.2466","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2011-05-12T13:17:38Z","cross_cats_sorted":["astro-ph.HE","astro-ph.SR","physics.comp-ph"],"title_canon_sha256":"71cab1459b73f6bd3cd4bb46be7d4147e5fce59d4ed940776711dc78c7ac70a7","abstract_canon_sha256":"7b7ca5b8fc0d45914843200021a41c962f4f3620d9d02487a97afa33f5f64657"},"schema_version":"1.0"},"canonical_sha256":"d915ddd149e797e4e8836d61d2b2b52303d960f732c5c948192140811e6a989f","source":{"kind":"arxiv","id":"1105.2466","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1105.2466","created_at":"2026-05-18T02:01:59Z"},{"alias_kind":"arxiv_version","alias_value":"1105.2466v2","created_at":"2026-05-18T02:01:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1105.2466","created_at":"2026-05-18T02:01:59Z"},{"alias_kind":"pith_short_12","alias_value":"3EK53UKJ46L6","created_at":"2026-05-18T12:26:18Z"},{"alias_kind":"pith_short_16","alias_value":"3EK53UKJ46L6J2ED","created_at":"2026-05-18T12:26:18Z"},{"alias_kind":"pith_short_8","alias_value":"3EK53UKJ","created_at":"2026-05-18T12:26:18Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:3EK53UKJ46L6J2EDNVQ5FMVVEM","target":"record","payload":{"canonical_record":{"source":{"id":"1105.2466","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2011-05-12T13:17:38Z","cross_cats_sorted":["astro-ph.HE","astro-ph.SR","physics.comp-ph"],"title_canon_sha256":"71cab1459b73f6bd3cd4bb46be7d4147e5fce59d4ed940776711dc78c7ac70a7","abstract_canon_sha256":"7b7ca5b8fc0d45914843200021a41c962f4f3620d9d02487a97afa33f5f64657"},"schema_version":"1.0"},"canonical_sha256":"d915ddd149e797e4e8836d61d2b2b52303d960f732c5c948192140811e6a989f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:01:59.169637Z","signature_b64":"nLyiOAW/T6jwV54iR3fWBh/+ivkHyerf7aVBMDj41O1PEGOpkTDG1xOxucoSj2S49GYARlHA/VXVImdXh/gLCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d915ddd149e797e4e8836d61d2b2b52303d960f732c5c948192140811e6a989f","last_reissued_at":"2026-05-18T02:01:59.169112Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:01:59.169112Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1105.2466","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:01:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kcldoJrjNsgnNAhK1e0AZM25i0DiF9DEsuW5pP8SlQw6i5GH9pvaSbbBnepmVgmwlaNV8wW+ccy+8vzssEcYBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T06:12:28.512524Z"},"content_sha256":"20d13495988cb12b13caf880fd02b32a8b4190475ec3a7801fc4ab219b58de9f","schema_version":"1.0","event_id":"sha256:20d13495988cb12b13caf880fd02b32a8b4190475ec3a7801fc4ab219b58de9f"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:3EK53UKJ46L6J2EDNVQ5FMVVEM","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"CASTRO: A New Compressible Astrophysical Solver. II. Gray Radiation Hydrodynamics","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE","astro-ph.SR","physics.comp-ph"],"primary_cat":"astro-ph.IM","authors_text":"A. Almgren (LBNL), A. Burrows (Princeton), J. Bell (LBNL), L. Howell (LLNL), W. Zhang (LBNL)","submitted_at":"2011-05-12T13:17:38Z","abstract_excerpt":"We describe the development of a flux-limited gray radiation solver for the compressible astrophysics code, CASTRO. CASTRO uses an Eulerian grid with block-structured adaptive mesh refinement based on a nested hierarchy of logically-rectangular variable-sized grids with simultaneous refinement in both space and time. The gray radiation solver is based on a mixed-frame formulation of radiation hydrodynamics. In our approach, the system is split into two parts, one part that couples the radiation and fluid in a hyperbolic subsystem, and another parabolic part that evolves radiation diffusion and"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1105.2466","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:01:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Bn6tCWJvLLvjTy4902b0dBXt8QfR3QSLC6rsp6+jOd9nhI64j3jtAGTD2EiXcLBLPpvYS7oBPFaqmk9WsiWDAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T06:12:28.512912Z"},"content_sha256":"821a4f08b91e000d2c95cf61d65ebc5f2b8a884fc482223d6c4fcfd52398c0d6","schema_version":"1.0","event_id":"sha256:821a4f08b91e000d2c95cf61d65ebc5f2b8a884fc482223d6c4fcfd52398c0d6"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/3EK53UKJ46L6J2EDNVQ5FMVVEM/bundle.json","state_url":"https://pith.science/pith/3EK53UKJ46L6J2EDNVQ5FMVVEM/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/3EK53UKJ46L6J2EDNVQ5FMVVEM/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-04T06:12:28Z","links":{"resolver":"https://pith.science/pith/3EK53UKJ46L6J2EDNVQ5FMVVEM","bundle":"https://pith.science/pith/3EK53UKJ46L6J2EDNVQ5FMVVEM/bundle.json","state":"https://pith.science/pith/3EK53UKJ46L6J2EDNVQ5FMVVEM/state.json","well_known_bundle":"https://pith.science/.well-known/pith/3EK53UKJ46L6J2EDNVQ5FMVVEM/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:3EK53UKJ46L6J2EDNVQ5FMVVEM","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"7b7ca5b8fc0d45914843200021a41c962f4f3620d9d02487a97afa33f5f64657","cross_cats_sorted":["astro-ph.HE","astro-ph.SR","physics.comp-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2011-05-12T13:17:38Z","title_canon_sha256":"71cab1459b73f6bd3cd4bb46be7d4147e5fce59d4ed940776711dc78c7ac70a7"},"schema_version":"1.0","source":{"id":"1105.2466","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1105.2466","created_at":"2026-05-18T02:01:59Z"},{"alias_kind":"arxiv_version","alias_value":"1105.2466v2","created_at":"2026-05-18T02:01:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1105.2466","created_at":"2026-05-18T02:01:59Z"},{"alias_kind":"pith_short_12","alias_value":"3EK53UKJ46L6","created_at":"2026-05-18T12:26:18Z"},{"alias_kind":"pith_short_16","alias_value":"3EK53UKJ46L6J2ED","created_at":"2026-05-18T12:26:18Z"},{"alias_kind":"pith_short_8","alias_value":"3EK53UKJ","created_at":"2026-05-18T12:26:18Z"}],"graph_snapshots":[{"event_id":"sha256:821a4f08b91e000d2c95cf61d65ebc5f2b8a884fc482223d6c4fcfd52398c0d6","target":"graph","created_at":"2026-05-18T02:01:59Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"We describe the development of a flux-limited gray radiation solver for the compressible astrophysics code, CASTRO. CASTRO uses an Eulerian grid with block-structured adaptive mesh refinement based on a nested hierarchy of logically-rectangular variable-sized grids with simultaneous refinement in both space and time. The gray radiation solver is based on a mixed-frame formulation of radiation hydrodynamics. In our approach, the system is split into two parts, one part that couples the radiation and fluid in a hyperbolic subsystem, and another parabolic part that evolves radiation diffusion and","authors_text":"A. Almgren (LBNL), A. Burrows (Princeton), J. Bell (LBNL), L. Howell (LLNL), W. Zhang (LBNL)","cross_cats":["astro-ph.HE","astro-ph.SR","physics.comp-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2011-05-12T13:17:38Z","title":"CASTRO: A New Compressible Astrophysical Solver. II. Gray Radiation Hydrodynamics"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1105.2466","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:20d13495988cb12b13caf880fd02b32a8b4190475ec3a7801fc4ab219b58de9f","target":"record","created_at":"2026-05-18T02:01:59Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"7b7ca5b8fc0d45914843200021a41c962f4f3620d9d02487a97afa33f5f64657","cross_cats_sorted":["astro-ph.HE","astro-ph.SR","physics.comp-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2011-05-12T13:17:38Z","title_canon_sha256":"71cab1459b73f6bd3cd4bb46be7d4147e5fce59d4ed940776711dc78c7ac70a7"},"schema_version":"1.0","source":{"id":"1105.2466","kind":"arxiv","version":2}},"canonical_sha256":"d915ddd149e797e4e8836d61d2b2b52303d960f732c5c948192140811e6a989f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d915ddd149e797e4e8836d61d2b2b52303d960f732c5c948192140811e6a989f","first_computed_at":"2026-05-18T02:01:59.169112Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:01:59.169112Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"nLyiOAW/T6jwV54iR3fWBh/+ivkHyerf7aVBMDj41O1PEGOpkTDG1xOxucoSj2S49GYARlHA/VXVImdXh/gLCg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:01:59.169637Z","signed_message":"canonical_sha256_bytes"},"source_id":"1105.2466","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:20d13495988cb12b13caf880fd02b32a8b4190475ec3a7801fc4ab219b58de9f","sha256:821a4f08b91e000d2c95cf61d65ebc5f2b8a884fc482223d6c4fcfd52398c0d6"],"state_sha256":"9d6ed15b0221d009d77921a8aa132e1e2f48d4898263751122d5239bea405beb"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kXvsUdGAEnNUCdb5WWSDD84yWrF8OJhUZBaQHQH42SlEMQonBqeZ7s1c1SrJ2mhq7bu9KfYe1+jtMANKVBbGCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-04T06:12:28.515029Z","bundle_sha256":"3e3eac90b7b3948301faaa7a01141427d710e813df32df838450e7a16d7e82e2"}}