{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2026:BTKDH5EOTWDIQUUEU3LNVPJZWG","short_pith_number":"pith:BTKDH5EO","schema_version":"1.0","canonical_sha256":"0cd433f48e9d86885284a6d6dabd39b1b8859ace69d47aee11e5a57ccb7a8caa","source":{"kind":"arxiv","id":"2608.11529","version":1},"attestation_state":"computed","paper":{"title":"Relativistic Dirac-Coulomb-Breit Four-Component Multireference Perturbation Theory within the Small Tensor Product Distributed Active Space Framework","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.chem-ph","authors_text":"Martijn Oele, Rajat Majumder, Ryan A. Beck, Shiv Upadhyay, Xiaosong Li","submitted_at":"2026-08-12T00:44:19Z","abstract_excerpt":"We present a four-component multireference second-order perturbation theory (4C-MRPT2) within the small tensor product distributed active space (STP-DAS) framework. The formulation is compatible with the Dirac-Coulomb (DC), Dirac-Coulomb-Gaunt (DCG), and Dirac-Coulomb-Breit (DCB) Hamiltonians, and inherits the memory-efficient and massively parallel STP-DAS algorithm, enabling perturbative treatments over very large external spaces. Benchmark calculations on noble-gas and group-13 atoms demonstrate that 4C-MRPT2 efficiently recovers all-electron dynamic correlation while providing new insight "},"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":"2608.11529","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.chem-ph","submitted_at":"2026-08-12T00:44:19Z","cross_cats_sorted":[],"title_canon_sha256":"3acbeb2dc840c083789f74a645eb213b8b6bd7ac1424a01bda40e9952871f512","abstract_canon_sha256":"4b47a74dd87df9e9989b005d7e2373ae46ffa4a1dc268c98e5c294a1d1dccbbe"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-08-13T00:22:07.579521Z","signature_b64":"Vdf1o5AhJ4hmFCbfQIh+ZLIhBq/qeOjYpHM22wSb5zreRhCFO4ZrvBhbQi/FPAlLJoC2a7Q3BDpljd/YA1uTAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0cd433f48e9d86885284a6d6dabd39b1b8859ace69d47aee11e5a57ccb7a8caa","last_reissued_at":"2026-08-13T00:22:07.577983Z","signature_status":"signed_v1","first_computed_at":"2026-08-13T00:22:07.577983Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Relativistic Dirac-Coulomb-Breit Four-Component Multireference Perturbation Theory within the Small Tensor Product Distributed Active Space Framework","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.chem-ph","authors_text":"Martijn Oele, Rajat Majumder, Ryan A. Beck, Shiv Upadhyay, Xiaosong Li","submitted_at":"2026-08-12T00:44:19Z","abstract_excerpt":"We present a four-component multireference second-order perturbation theory (4C-MRPT2) within the small tensor product distributed active space (STP-DAS) framework. The formulation is compatible with the Dirac-Coulomb (DC), Dirac-Coulomb-Gaunt (DCG), and Dirac-Coulomb-Breit (DCB) Hamiltonians, and inherits the memory-efficient and massively parallel STP-DAS algorithm, enabling perturbative treatments over very large external spaces. Benchmark calculations on noble-gas and group-13 atoms demonstrate that 4C-MRPT2 efficiently recovers all-electron dynamic correlation while providing new insight "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2608.11529","kind":"arxiv","version":1},"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/2608.11529/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"},"aliases":[{"alias_kind":"arxiv","alias_value":"2608.11529","created_at":"2026-08-13T00:22:07.578286+00:00"},{"alias_kind":"arxiv_version","alias_value":"2608.11529v1","created_at":"2026-08-13T00:22:07.578286+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2608.11529","created_at":"2026-08-13T00:22:07.578286+00:00"},{"alias_kind":"pith_short_12","alias_value":"BTKDH5EOTWDI","created_at":"2026-08-13T00:22:07.578286+00:00"},{"alias_kind":"pith_short_16","alias_value":"BTKDH5EOTWDIQUUE","created_at":"2026-08-13T00:22:07.578286+00:00"},{"alias_kind":"pith_short_8","alias_value":"BTKDH5EO","created_at":"2026-08-13T00:22:07.578286+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/BTKDH5EOTWDIQUUEU3LNVPJZWG","json":"https://pith.science/pith/BTKDH5EOTWDIQUUEU3LNVPJZWG.json","graph_json":"https://pith.science/api/pith-number/BTKDH5EOTWDIQUUEU3LNVPJZWG/graph.json","events_json":"https://pith.science/api/pith-number/BTKDH5EOTWDIQUUEU3LNVPJZWG/events.json","paper":"https://pith.science/paper/BTKDH5EO"},"agent_actions":{"view_html":"https://pith.science/pith/BTKDH5EOTWDIQUUEU3LNVPJZWG","download_json":"https://pith.science/pith/BTKDH5EOTWDIQUUEU3LNVPJZWG.json","view_paper":"https://pith.science/paper/BTKDH5EO","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2608.11529&json=true","fetch_graph":"https://pith.science/api/pith-number/BTKDH5EOTWDIQUUEU3LNVPJZWG/graph.json","fetch_events":"https://pith.science/api/pith-number/BTKDH5EOTWDIQUUEU3LNVPJZWG/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/BTKDH5EOTWDIQUUEU3LNVPJZWG/action/timestamp_anchor","attest_storage":"https://pith.science/pith/BTKDH5EOTWDIQUUEU3LNVPJZWG/action/storage_attestation","attest_author":"https://pith.science/pith/BTKDH5EOTWDIQUUEU3LNVPJZWG/action/author_attestation","sign_citation":"https://pith.science/pith/BTKDH5EOTWDIQUUEU3LNVPJZWG/action/citation_signature","submit_replication":"https://pith.science/pith/BTKDH5EOTWDIQUUEU3LNVPJZWG/action/replication_record"}},"created_at":"2026-08-13T00:22:07.578286+00:00","updated_at":"2026-08-13T00:22:07.578286+00:00"}