{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:IYGBG3UHYBZ4PVGIMOKA32BQTQ","short_pith_number":"pith:IYGBG3UH","canonical_record":{"source":{"id":"2112.04027","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-th","submitted_at":"2021-12-07T22:38:39Z","cross_cats_sorted":["quant-ph"],"title_canon_sha256":"94fb58ceeb585c97d5407f181b26cee4937fa4c25fcaf6d6afdfbe3aa323e765","abstract_canon_sha256":"dbb839c5969bc58c2088bfcc8ba299e08c505020eff837e055d53499be68ab5a"},"schema_version":"1.0"},"canonical_sha256":"460c136e87c073c7d4c863940de8309c19c3c065bbaf4716d773e3747324b554","source":{"kind":"arxiv","id":"2112.04027","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2112.04027","created_at":"2026-07-05T04:20:31Z"},{"alias_kind":"arxiv_version","alias_value":"2112.04027v2","created_at":"2026-07-05T04:20:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2112.04027","created_at":"2026-07-05T04:20:31Z"},{"alias_kind":"pith_short_12","alias_value":"IYGBG3UHYBZ4","created_at":"2026-07-05T04:20:31Z"},{"alias_kind":"pith_short_16","alias_value":"IYGBG3UHYBZ4PVGI","created_at":"2026-07-05T04:20:31Z"},{"alias_kind":"pith_short_8","alias_value":"IYGBG3UH","created_at":"2026-07-05T04:20:31Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:IYGBG3UHYBZ4PVGIMOKA32BQTQ","target":"record","payload":{"canonical_record":{"source":{"id":"2112.04027","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-th","submitted_at":"2021-12-07T22:38:39Z","cross_cats_sorted":["quant-ph"],"title_canon_sha256":"94fb58ceeb585c97d5407f181b26cee4937fa4c25fcaf6d6afdfbe3aa323e765","abstract_canon_sha256":"dbb839c5969bc58c2088bfcc8ba299e08c505020eff837e055d53499be68ab5a"},"schema_version":"1.0"},"canonical_sha256":"460c136e87c073c7d4c863940de8309c19c3c065bbaf4716d773e3747324b554","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T04:20:31.417738Z","signature_b64":"VtPUIDNZV/POfVbOHHxIXwsgEuPWQYMJkYdrYPgARDTeHY2W28mU3EO+QRi5eWo2bqkrDEprwPXgVogHEWMICQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"460c136e87c073c7d4c863940de8309c19c3c065bbaf4716d773e3747324b554","last_reissued_at":"2026-07-05T04:20:31.417311Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T04:20:31.417311Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2112.04027","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":"2026-07-05T04:20:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WdSW+Kka3l85PKSUKbfTFgFjf83uJIhz5VpaTRvcoF4hfReqX10DlP7bz+R+S0MON3HFE9HUYR30GiN/GOdQDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T21:18:04.038129Z"},"content_sha256":"5dd788be6855f5c89e6e77db1a49258429722d1e4f8f8317f412d48688a00980","schema_version":"1.0","event_id":"sha256:5dd788be6855f5c89e6e77db1a49258429722d1e4f8f8317f412d48688a00980"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:IYGBG3UHYBZ4PVGIMOKA32BQTQ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Natural orbitals for the ab initio no-core configuration interaction approach","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["quant-ph"],"primary_cat":"nucl-th","authors_text":"Chrysovalantis Constantinou, James P. Vary, Mark A. Caprio, Patrick J. Fasano, Pieter Maris","submitted_at":"2021-12-07T22:38:39Z","abstract_excerpt":"Ab initio no-core configuration interaction (NCCI) calculations for the nuclear many-body problem have traditionally relied upon an antisymmetrized product (Slater determinant) basis built from harmonic oscillator orbitals. The accuracy of such calculations is limited by the finite dimensions which are computationally feasible for the truncated many-body space. We therefore seek to improve the accuracy obtained for a given basis size by optimizing the choice of single-particle orbitals. Natural orbitals, which diagonalize the one-body density matrix, provide a basis which maximizes the occupat"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2112.04027","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/2112.04027/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":"2026-07-05T04:20:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZdBSfCKdpgYpRmPnYi/x/SamXfc5qcjb18wBcr829pBME2Djo6VdZQmQonQKPJp2kgPTbwMan19o0DZOBnIeAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T21:18:04.038662Z"},"content_sha256":"4c9b84681e5229a69775e1f37be86b0c7d4bc9891ca247eacb864c229dee8963","schema_version":"1.0","event_id":"sha256:4c9b84681e5229a69775e1f37be86b0c7d4bc9891ca247eacb864c229dee8963"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IYGBG3UHYBZ4PVGIMOKA32BQTQ/bundle.json","state_url":"https://pith.science/pith/IYGBG3UHYBZ4PVGIMOKA32BQTQ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IYGBG3UHYBZ4PVGIMOKA32BQTQ/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":"2026-08-16T21:18:04Z","links":{"resolver":"https://pith.science/pith/IYGBG3UHYBZ4PVGIMOKA32BQTQ","bundle":"https://pith.science/pith/IYGBG3UHYBZ4PVGIMOKA32BQTQ/bundle.json","state":"https://pith.science/pith/IYGBG3UHYBZ4PVGIMOKA32BQTQ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IYGBG3UHYBZ4PVGIMOKA32BQTQ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:IYGBG3UHYBZ4PVGIMOKA32BQTQ","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":"dbb839c5969bc58c2088bfcc8ba299e08c505020eff837e055d53499be68ab5a","cross_cats_sorted":["quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-th","submitted_at":"2021-12-07T22:38:39Z","title_canon_sha256":"94fb58ceeb585c97d5407f181b26cee4937fa4c25fcaf6d6afdfbe3aa323e765"},"schema_version":"1.0","source":{"id":"2112.04027","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2112.04027","created_at":"2026-07-05T04:20:31Z"},{"alias_kind":"arxiv_version","alias_value":"2112.04027v2","created_at":"2026-07-05T04:20:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2112.04027","created_at":"2026-07-05T04:20:31Z"},{"alias_kind":"pith_short_12","alias_value":"IYGBG3UHYBZ4","created_at":"2026-07-05T04:20:31Z"},{"alias_kind":"pith_short_16","alias_value":"IYGBG3UHYBZ4PVGI","created_at":"2026-07-05T04:20:31Z"},{"alias_kind":"pith_short_8","alias_value":"IYGBG3UH","created_at":"2026-07-05T04:20:31Z"}],"graph_snapshots":[{"event_id":"sha256:4c9b84681e5229a69775e1f37be86b0c7d4bc9891ca247eacb864c229dee8963","target":"graph","created_at":"2026-07-05T04:20:31Z","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/2112.04027/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Ab initio no-core configuration interaction (NCCI) calculations for the nuclear many-body problem have traditionally relied upon an antisymmetrized product (Slater determinant) basis built from harmonic oscillator orbitals. The accuracy of such calculations is limited by the finite dimensions which are computationally feasible for the truncated many-body space. We therefore seek to improve the accuracy obtained for a given basis size by optimizing the choice of single-particle orbitals. Natural orbitals, which diagonalize the one-body density matrix, provide a basis which maximizes the occupat","authors_text":"Chrysovalantis Constantinou, James P. Vary, Mark A. Caprio, Patrick J. Fasano, Pieter Maris","cross_cats":["quant-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-th","submitted_at":"2021-12-07T22:38:39Z","title":"Natural orbitals for the ab initio no-core configuration interaction approach"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2112.04027","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":"sha256:5dd788be6855f5c89e6e77db1a49258429722d1e4f8f8317f412d48688a00980","target":"record","created_at":"2026-07-05T04:20:31Z","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":"dbb839c5969bc58c2088bfcc8ba299e08c505020eff837e055d53499be68ab5a","cross_cats_sorted":["quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-th","submitted_at":"2021-12-07T22:38:39Z","title_canon_sha256":"94fb58ceeb585c97d5407f181b26cee4937fa4c25fcaf6d6afdfbe3aa323e765"},"schema_version":"1.0","source":{"id":"2112.04027","kind":"arxiv","version":2}},"canonical_sha256":"460c136e87c073c7d4c863940de8309c19c3c065bbaf4716d773e3747324b554","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"460c136e87c073c7d4c863940de8309c19c3c065bbaf4716d773e3747324b554","first_computed_at":"2026-07-05T04:20:31.417311Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T04:20:31.417311Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"VtPUIDNZV/POfVbOHHxIXwsgEuPWQYMJkYdrYPgARDTeHY2W28mU3EO+QRi5eWo2bqkrDEprwPXgVogHEWMICQ==","signature_status":"signed_v1","signed_at":"2026-07-05T04:20:31.417738Z","signed_message":"canonical_sha256_bytes"},"source_id":"2112.04027","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5dd788be6855f5c89e6e77db1a49258429722d1e4f8f8317f412d48688a00980","sha256:4c9b84681e5229a69775e1f37be86b0c7d4bc9891ca247eacb864c229dee8963"],"state_sha256":"510a8350f02d988a3d408302aa6f0967277c2d74ef891af77a6f8cae40d32fdb"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"gude15cXkm+Z4sLDVIsmFsHabAsKTJYt+7hJZXVU4i5emAHMo1lOu2XUVXJay6v0mjkDII/VpX+gIuHpidUJCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-16T21:18:04.042898Z","bundle_sha256":"94afda788b9d232f83d8a9c9071b99309dc87c3c7fc53b31e914aee38f399941"}}