{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:7DWSRN2OQNT6G3PYTDVHLK4M7W","short_pith_number":"pith:7DWSRN2O","canonical_record":{"source":{"id":"1403.0797","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2014-03-04T14:24:20Z","cross_cats_sorted":["cond-mat.mes-hall","cond-mat.soft","physics.atm-clus","physics.chem-ph"],"title_canon_sha256":"5393774937c3214ec1bcd05c3db31a5e3fd950c58c1e93b3552887292888fe78","abstract_canon_sha256":"2befd881f1b7d8ab3be1628647e852cf8d30dd9b296ee913fd93efbd234f097e"},"schema_version":"1.0"},"canonical_sha256":"f8ed28b74e8367e36df898ea75ab8cfd999ff53284cf2aba55d3b6c1e2fa1b25","source":{"kind":"arxiv","id":"1403.0797","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1403.0797","created_at":"2026-05-18T01:44:20Z"},{"alias_kind":"arxiv_version","alias_value":"1403.0797v1","created_at":"2026-05-18T01:44:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1403.0797","created_at":"2026-05-18T01:44:20Z"},{"alias_kind":"pith_short_12","alias_value":"7DWSRN2OQNT6","created_at":"2026-05-18T12:28:16Z"},{"alias_kind":"pith_short_16","alias_value":"7DWSRN2OQNT6G3PY","created_at":"2026-05-18T12:28:16Z"},{"alias_kind":"pith_short_8","alias_value":"7DWSRN2O","created_at":"2026-05-18T12:28:16Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:7DWSRN2OQNT6G3PYTDVHLK4M7W","target":"record","payload":{"canonical_record":{"source":{"id":"1403.0797","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2014-03-04T14:24:20Z","cross_cats_sorted":["cond-mat.mes-hall","cond-mat.soft","physics.atm-clus","physics.chem-ph"],"title_canon_sha256":"5393774937c3214ec1bcd05c3db31a5e3fd950c58c1e93b3552887292888fe78","abstract_canon_sha256":"2befd881f1b7d8ab3be1628647e852cf8d30dd9b296ee913fd93efbd234f097e"},"schema_version":"1.0"},"canonical_sha256":"f8ed28b74e8367e36df898ea75ab8cfd999ff53284cf2aba55d3b6c1e2fa1b25","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:44:20.305362Z","signature_b64":"jJ8QYLuGb2HHcEvI8caUMqfBcNFcjS16Iaw256ZaGg1lJhvXKQhIjX713q0ti6hxp1bFlmw/EU9H29uuOGDNCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f8ed28b74e8367e36df898ea75ab8cfd999ff53284cf2aba55d3b6c1e2fa1b25","last_reissued_at":"2026-05-18T01:44:20.304777Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:44:20.304777Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1403.0797","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:44:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Nol3qxNB2MzQGhd6JDAMydY0ULmD4hcnyOWneeZP9IV4jMXapeR3ojt/CCVESuHvhkki0N9kuyYhfAteutrCCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T11:13:15.422102Z"},"content_sha256":"84a9d2e3f2989fc7f3cfd60430453d2401f414027b195866ca972d7808ecfd24","schema_version":"1.0","event_id":"sha256:84a9d2e3f2989fc7f3cfd60430453d2401f414027b195866ca972d7808ecfd24"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:7DWSRN2OQNT6G3PYTDVHLK4M7W","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"van der Waals density functionals built upon the electron-gas tradition: Facing the challenge of competing interactions","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.mes-hall","cond-mat.soft","physics.atm-clus","physics.chem-ph"],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Bengt I. Lundqvist, Calvin A. Arter, Elsebeth Schr\\\"oder, Kristian Berland, Kyuho Lee, Per Hyldgaard, T. Thonhauser, Valentino R. Cooper","submitted_at":"2014-03-04T14:24:20Z","abstract_excerpt":"The theoretical description of sparse matter attracts much interest, in particular for those ground-state properties that can be described by density functional theory (DFT). One proposed approach, the van der Waals density functional (vdW-DF) method, rests on strong physical foundations and offers simple yet accurate and robust functionals. A very recent functional within this method called vdW-DF-cx [K. Berland and P. Hyldgaard, Phys. Rev. B 89, 035412] stands out in its attempt to use an exchange energy derived from the same plasmon-based theory from which the nonlocal correlation energy wa"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1403.0797","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:44:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9YejS7/6HeFg9Lr8GJ/fIjDWjq2qaAk/RDl6Y5kt53i+05SxAZjofmUMptfSt4Z632elXEWRqn4dYL+VT/f0Cw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T11:13:15.422833Z"},"content_sha256":"cf5d73013b4e5ab9b699b359e544ca5bf4d3f711bc38bc4427a60eec52193377","schema_version":"1.0","event_id":"sha256:cf5d73013b4e5ab9b699b359e544ca5bf4d3f711bc38bc4427a60eec52193377"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/7DWSRN2OQNT6G3PYTDVHLK4M7W/bundle.json","state_url":"https://pith.science/pith/7DWSRN2OQNT6G3PYTDVHLK4M7W/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/7DWSRN2OQNT6G3PYTDVHLK4M7W/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":"2026-05-31T11:13:15Z","links":{"resolver":"https://pith.science/pith/7DWSRN2OQNT6G3PYTDVHLK4M7W","bundle":"https://pith.science/pith/7DWSRN2OQNT6G3PYTDVHLK4M7W/bundle.json","state":"https://pith.science/pith/7DWSRN2OQNT6G3PYTDVHLK4M7W/state.json","well_known_bundle":"https://pith.science/.well-known/pith/7DWSRN2OQNT6G3PYTDVHLK4M7W/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:7DWSRN2OQNT6G3PYTDVHLK4M7W","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":"2befd881f1b7d8ab3be1628647e852cf8d30dd9b296ee913fd93efbd234f097e","cross_cats_sorted":["cond-mat.mes-hall","cond-mat.soft","physics.atm-clus","physics.chem-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2014-03-04T14:24:20Z","title_canon_sha256":"5393774937c3214ec1bcd05c3db31a5e3fd950c58c1e93b3552887292888fe78"},"schema_version":"1.0","source":{"id":"1403.0797","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1403.0797","created_at":"2026-05-18T01:44:20Z"},{"alias_kind":"arxiv_version","alias_value":"1403.0797v1","created_at":"2026-05-18T01:44:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1403.0797","created_at":"2026-05-18T01:44:20Z"},{"alias_kind":"pith_short_12","alias_value":"7DWSRN2OQNT6","created_at":"2026-05-18T12:28:16Z"},{"alias_kind":"pith_short_16","alias_value":"7DWSRN2OQNT6G3PY","created_at":"2026-05-18T12:28:16Z"},{"alias_kind":"pith_short_8","alias_value":"7DWSRN2O","created_at":"2026-05-18T12:28:16Z"}],"graph_snapshots":[{"event_id":"sha256:cf5d73013b4e5ab9b699b359e544ca5bf4d3f711bc38bc4427a60eec52193377","target":"graph","created_at":"2026-05-18T01:44:20Z","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":"The theoretical description of sparse matter attracts much interest, in particular for those ground-state properties that can be described by density functional theory (DFT). One proposed approach, the van der Waals density functional (vdW-DF) method, rests on strong physical foundations and offers simple yet accurate and robust functionals. A very recent functional within this method called vdW-DF-cx [K. Berland and P. Hyldgaard, Phys. Rev. B 89, 035412] stands out in its attempt to use an exchange energy derived from the same plasmon-based theory from which the nonlocal correlation energy wa","authors_text":"Bengt I. Lundqvist, Calvin A. Arter, Elsebeth Schr\\\"oder, Kristian Berland, Kyuho Lee, Per Hyldgaard, T. Thonhauser, Valentino R. Cooper","cross_cats":["cond-mat.mes-hall","cond-mat.soft","physics.atm-clus","physics.chem-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2014-03-04T14:24:20Z","title":"van der Waals density functionals built upon the electron-gas tradition: Facing the challenge of competing interactions"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1403.0797","kind":"arxiv","version":1},"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":"sha256:84a9d2e3f2989fc7f3cfd60430453d2401f414027b195866ca972d7808ecfd24","target":"record","created_at":"2026-05-18T01:44:20Z","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":"2befd881f1b7d8ab3be1628647e852cf8d30dd9b296ee913fd93efbd234f097e","cross_cats_sorted":["cond-mat.mes-hall","cond-mat.soft","physics.atm-clus","physics.chem-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2014-03-04T14:24:20Z","title_canon_sha256":"5393774937c3214ec1bcd05c3db31a5e3fd950c58c1e93b3552887292888fe78"},"schema_version":"1.0","source":{"id":"1403.0797","kind":"arxiv","version":1}},"canonical_sha256":"f8ed28b74e8367e36df898ea75ab8cfd999ff53284cf2aba55d3b6c1e2fa1b25","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f8ed28b74e8367e36df898ea75ab8cfd999ff53284cf2aba55d3b6c1e2fa1b25","first_computed_at":"2026-05-18T01:44:20.304777Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:44:20.304777Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"jJ8QYLuGb2HHcEvI8caUMqfBcNFcjS16Iaw256ZaGg1lJhvXKQhIjX713q0ti6hxp1bFlmw/EU9H29uuOGDNCw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:44:20.305362Z","signed_message":"canonical_sha256_bytes"},"source_id":"1403.0797","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:84a9d2e3f2989fc7f3cfd60430453d2401f414027b195866ca972d7808ecfd24","sha256:cf5d73013b4e5ab9b699b359e544ca5bf4d3f711bc38bc4427a60eec52193377"],"state_sha256":"85aab756c5fe446e5c2978cf065b61f1eb66c1f03f9f389bf2c10fd9d7a9c03e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"enyqLhjZH9tUneZwIbgMO4/Fdx6PQ9E41ZA9smwWsUG2+v81eIYD4y4VAMcO5Y2hOaBb/XPvUsGQmD9iIPJ9Bw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T11:13:15.427085Z","bundle_sha256":"e212235f169b3345f4aa0bffc44416478399a5dd26f25ddd41642c789b740019"}}