{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2022:42QAUPM5TYX2GROKUBA3AV4ECI","short_pith_number":"pith:42QAUPM5","canonical_record":{"source":{"id":"2208.09412","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.comp-ph","submitted_at":"2022-08-19T15:54:51Z","cross_cats_sorted":[],"title_canon_sha256":"25108fc8e28b138f35d6044dfc81f5c910376c6c6be2ac4fd6a288d6a7502e0f","abstract_canon_sha256":"34a216ac30bf43a6526ff961b609240d35270df952f130e780e6efa545e0835c"},"schema_version":"1.0"},"canonical_sha256":"e6a00a3d9d9e2fa345caa041b05784120b94002df33ae5412789dd1404fc9964","source":{"kind":"arxiv","id":"2208.09412","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2208.09412","created_at":"2026-07-05T05:21:43Z"},{"alias_kind":"arxiv_version","alias_value":"2208.09412v2","created_at":"2026-07-05T05:21:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2208.09412","created_at":"2026-07-05T05:21:43Z"},{"alias_kind":"pith_short_12","alias_value":"42QAUPM5TYX2","created_at":"2026-07-05T05:21:43Z"},{"alias_kind":"pith_short_16","alias_value":"42QAUPM5TYX2GROK","created_at":"2026-07-05T05:21:43Z"},{"alias_kind":"pith_short_8","alias_value":"42QAUPM5","created_at":"2026-07-05T05:21:43Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2022:42QAUPM5TYX2GROKUBA3AV4ECI","target":"record","payload":{"canonical_record":{"source":{"id":"2208.09412","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.comp-ph","submitted_at":"2022-08-19T15:54:51Z","cross_cats_sorted":[],"title_canon_sha256":"25108fc8e28b138f35d6044dfc81f5c910376c6c6be2ac4fd6a288d6a7502e0f","abstract_canon_sha256":"34a216ac30bf43a6526ff961b609240d35270df952f130e780e6efa545e0835c"},"schema_version":"1.0"},"canonical_sha256":"e6a00a3d9d9e2fa345caa041b05784120b94002df33ae5412789dd1404fc9964","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T05:21:43.224424Z","signature_b64":"8t0gEyaKuhpkhP0oRZcoN1+UlBWzKr+55hlVuyYSwHmAkRcnBHLbdyRQez2IpT/TwcrxwVaDJEWkaxnMYPbqDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e6a00a3d9d9e2fa345caa041b05784120b94002df33ae5412789dd1404fc9964","last_reissued_at":"2026-07-05T05:21:43.224072Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T05:21:43.224072Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2208.09412","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":"2026-07-05T05:21:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zzf0u8teFAtm3SOmgFkKeh35Z+Ozr99FtcYHrPjQKypM9TLeA7HvJVfjnZGHqOTSjrcSlhjIyUk9gJjVWqcvDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-20T18:52:44.258625Z"},"content_sha256":"fadec2d8219f15de9d5351ef4cce6ae43caff109a0caa1a091c3d0f4da9a758c","schema_version":"1.0","event_id":"sha256:fadec2d8219f15de9d5351ef4cce6ae43caff109a0caa1a091c3d0f4da9a758c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2022:42QAUPM5TYX2GROKUBA3AV4ECI","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Multigroup Neutron Transport using a Collision-Based Hybrid Method","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"physics.comp-ph","authors_text":"Ben Whewell, Cory D. Hauck, Minwoo Shin, Ryan G. McClarren","submitted_at":"2022-08-19T15:54:51Z","abstract_excerpt":"A collision-based hybrid algorithm for the discrete ordinates approximation of the neutron transport equation is extended to the multigroup setting. The algorithm uses discrete energy and angle grids at two different resolutions and approximates the fission and scattering sources on the coarser grids. The coupling of a collided transport equation, discretized on the coarse grid, with an uncollided transport equation, discretized on the fine grid, yields an algorithm that, in most cases, is more efficient than the traditional multigroup approach. The improvement over existing techniques is demo"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2208.09412","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/2208.09412/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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T05:21:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"f6MUUC0noInJNF99A14PHCnTSH13w6BM6KFyoF1FpoQaOZXWUoMKmhxmJmRAgmQStnlXcP8TJsDh3LnJNJwSBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-20T18:52:44.259014Z"},"content_sha256":"bdb97904e2d8f47605fe99a274c6aee56ea5e86d5cb5fa015d12945a3de61451","schema_version":"1.0","event_id":"sha256:bdb97904e2d8f47605fe99a274c6aee56ea5e86d5cb5fa015d12945a3de61451"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/42QAUPM5TYX2GROKUBA3AV4ECI/bundle.json","state_url":"https://pith.science/pith/42QAUPM5TYX2GROKUBA3AV4ECI/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/42QAUPM5TYX2GROKUBA3AV4ECI/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":"2026-07-20T18:52:44Z","links":{"resolver":"https://pith.science/pith/42QAUPM5TYX2GROKUBA3AV4ECI","bundle":"https://pith.science/pith/42QAUPM5TYX2GROKUBA3AV4ECI/bundle.json","state":"https://pith.science/pith/42QAUPM5TYX2GROKUBA3AV4ECI/state.json","well_known_bundle":"https://pith.science/.well-known/pith/42QAUPM5TYX2GROKUBA3AV4ECI/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2022:42QAUPM5TYX2GROKUBA3AV4ECI","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":"34a216ac30bf43a6526ff961b609240d35270df952f130e780e6efa545e0835c","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.comp-ph","submitted_at":"2022-08-19T15:54:51Z","title_canon_sha256":"25108fc8e28b138f35d6044dfc81f5c910376c6c6be2ac4fd6a288d6a7502e0f"},"schema_version":"1.0","source":{"id":"2208.09412","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2208.09412","created_at":"2026-07-05T05:21:43Z"},{"alias_kind":"arxiv_version","alias_value":"2208.09412v2","created_at":"2026-07-05T05:21:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2208.09412","created_at":"2026-07-05T05:21:43Z"},{"alias_kind":"pith_short_12","alias_value":"42QAUPM5TYX2","created_at":"2026-07-05T05:21:43Z"},{"alias_kind":"pith_short_16","alias_value":"42QAUPM5TYX2GROK","created_at":"2026-07-05T05:21:43Z"},{"alias_kind":"pith_short_8","alias_value":"42QAUPM5","created_at":"2026-07-05T05:21:43Z"}],"graph_snapshots":[{"event_id":"sha256:bdb97904e2d8f47605fe99a274c6aee56ea5e86d5cb5fa015d12945a3de61451","target":"graph","created_at":"2026-07-05T05:21:43Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2208.09412/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"A collision-based hybrid algorithm for the discrete ordinates approximation of the neutron transport equation is extended to the multigroup setting. The algorithm uses discrete energy and angle grids at two different resolutions and approximates the fission and scattering sources on the coarser grids. The coupling of a collided transport equation, discretized on the coarse grid, with an uncollided transport equation, discretized on the fine grid, yields an algorithm that, in most cases, is more efficient than the traditional multigroup approach. The improvement over existing techniques is demo","authors_text":"Ben Whewell, Cory D. Hauck, Minwoo Shin, Ryan G. McClarren","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.comp-ph","submitted_at":"2022-08-19T15:54:51Z","title":"Multigroup Neutron Transport using a Collision-Based Hybrid Method"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2208.09412","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:fadec2d8219f15de9d5351ef4cce6ae43caff109a0caa1a091c3d0f4da9a758c","target":"record","created_at":"2026-07-05T05:21:43Z","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":"34a216ac30bf43a6526ff961b609240d35270df952f130e780e6efa545e0835c","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.comp-ph","submitted_at":"2022-08-19T15:54:51Z","title_canon_sha256":"25108fc8e28b138f35d6044dfc81f5c910376c6c6be2ac4fd6a288d6a7502e0f"},"schema_version":"1.0","source":{"id":"2208.09412","kind":"arxiv","version":2}},"canonical_sha256":"e6a00a3d9d9e2fa345caa041b05784120b94002df33ae5412789dd1404fc9964","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e6a00a3d9d9e2fa345caa041b05784120b94002df33ae5412789dd1404fc9964","first_computed_at":"2026-07-05T05:21:43.224072Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T05:21:43.224072Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"8t0gEyaKuhpkhP0oRZcoN1+UlBWzKr+55hlVuyYSwHmAkRcnBHLbdyRQez2IpT/TwcrxwVaDJEWkaxnMYPbqDA==","signature_status":"signed_v1","signed_at":"2026-07-05T05:21:43.224424Z","signed_message":"canonical_sha256_bytes"},"source_id":"2208.09412","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:fadec2d8219f15de9d5351ef4cce6ae43caff109a0caa1a091c3d0f4da9a758c","sha256:bdb97904e2d8f47605fe99a274c6aee56ea5e86d5cb5fa015d12945a3de61451"],"state_sha256":"4bccb23dc6036412f6c773d4b9870d025e50e1e9acb262d11f74954d699c3db2"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"g7sSQ7HCK9JIpTlZyypDcMrvcBNrW0cwR58oV0FnPsPt3c9/9T9i+axfWPS3d2J0xZE7ai6JHG9Rf07azm7RDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-20T18:52:44.261150Z","bundle_sha256":"4de241fdeeea6baae086831f1a3aa54601897766235632285b6457c9a85b31c4"}}