{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2015:RIBDYEU5VMCHYAVUQRZK5KV6LJ","short_pith_number":"pith:RIBDYEU5","schema_version":"1.0","canonical_sha256":"8a023c129dab047c02b48472aeaabe5a6abd5a2e1f71cf9ed0dead1840af94e5","source":{"kind":"arxiv","id":"1503.04878","version":1},"attestation_state":"computed","paper":{"title":"Pair extended coupled cluster doubles","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.chem-ph","authors_text":"Gustavo E. Scuseria, Ireneusz W. Bulik, Thomas M. Henderson","submitted_at":"2015-03-16T23:33:56Z","abstract_excerpt":"The accurate and efficient description of strongly correlated systems remains an important challenge for computational methods. Doubly occupied configuration interaction (DOCI), in which all electrons are paired and no correlations which break these pairs are permitted, can in many cases provide an accurate account of strong correlations, albeit at combinatorial computational cost. Recently, there has been significant interest in a method we refer to as pair coupled cluster doubles (pCCD), a variant of coupled cluster doubles in which the electrons are paired. This is simply because pCCD provi"},"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":"1503.04878","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.chem-ph","submitted_at":"2015-03-16T23:33:56Z","cross_cats_sorted":[],"title_canon_sha256":"93f0fb769f7e2ad40ae827e6a6848bacb94f57e82e18b25f8a5bebdf478425af","abstract_canon_sha256":"e4a74a493b7c4192a99ae75ee812c2c964b561b06a525498d3ffad6c8268192a"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:20:03.706972Z","signature_b64":"5AEIVNrfu9d/Bu4hFb1wvwVV7pq+MrTU2XXwgkHBoyuluyyC1pLPMn6Gl9Er8W2gV3kfxXQ1PRNnKs83F0/JCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8a023c129dab047c02b48472aeaabe5a6abd5a2e1f71cf9ed0dead1840af94e5","last_reissued_at":"2026-05-18T01:20:03.706394Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:20:03.706394Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Pair extended coupled cluster doubles","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.chem-ph","authors_text":"Gustavo E. Scuseria, Ireneusz W. Bulik, Thomas M. Henderson","submitted_at":"2015-03-16T23:33:56Z","abstract_excerpt":"The accurate and efficient description of strongly correlated systems remains an important challenge for computational methods. Doubly occupied configuration interaction (DOCI), in which all electrons are paired and no correlations which break these pairs are permitted, can in many cases provide an accurate account of strong correlations, albeit at combinatorial computational cost. Recently, there has been significant interest in a method we refer to as pair coupled cluster doubles (pCCD), a variant of coupled cluster doubles in which the electrons are paired. This is simply because pCCD provi"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1503.04878","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":""},"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":"1503.04878","created_at":"2026-05-18T01:20:03.706497+00:00"},{"alias_kind":"arxiv_version","alias_value":"1503.04878v1","created_at":"2026-05-18T01:20:03.706497+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1503.04878","created_at":"2026-05-18T01:20:03.706497+00:00"},{"alias_kind":"pith_short_12","alias_value":"RIBDYEU5VMCH","created_at":"2026-05-18T12:29:39.896362+00:00"},{"alias_kind":"pith_short_16","alias_value":"RIBDYEU5VMCHYAVU","created_at":"2026-05-18T12:29:39.896362+00:00"},{"alias_kind":"pith_short_8","alias_value":"RIBDYEU5","created_at":"2026-05-18T12:29:39.896362+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/RIBDYEU5VMCHYAVUQRZK5KV6LJ","json":"https://pith.science/pith/RIBDYEU5VMCHYAVUQRZK5KV6LJ.json","graph_json":"https://pith.science/api/pith-number/RIBDYEU5VMCHYAVUQRZK5KV6LJ/graph.json","events_json":"https://pith.science/api/pith-number/RIBDYEU5VMCHYAVUQRZK5KV6LJ/events.json","paper":"https://pith.science/paper/RIBDYEU5"},"agent_actions":{"view_html":"https://pith.science/pith/RIBDYEU5VMCHYAVUQRZK5KV6LJ","download_json":"https://pith.science/pith/RIBDYEU5VMCHYAVUQRZK5KV6LJ.json","view_paper":"https://pith.science/paper/RIBDYEU5","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1503.04878&json=true","fetch_graph":"https://pith.science/api/pith-number/RIBDYEU5VMCHYAVUQRZK5KV6LJ/graph.json","fetch_events":"https://pith.science/api/pith-number/RIBDYEU5VMCHYAVUQRZK5KV6LJ/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/RIBDYEU5VMCHYAVUQRZK5KV6LJ/action/timestamp_anchor","attest_storage":"https://pith.science/pith/RIBDYEU5VMCHYAVUQRZK5KV6LJ/action/storage_attestation","attest_author":"https://pith.science/pith/RIBDYEU5VMCHYAVUQRZK5KV6LJ/action/author_attestation","sign_citation":"https://pith.science/pith/RIBDYEU5VMCHYAVUQRZK5KV6LJ/action/citation_signature","submit_replication":"https://pith.science/pith/RIBDYEU5VMCHYAVUQRZK5KV6LJ/action/replication_record"}},"created_at":"2026-05-18T01:20:03.706497+00:00","updated_at":"2026-05-18T01:20:03.706497+00:00"}