{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:IRHBHC7IG53EL5KBGOEPL4NSK5","short_pith_number":"pith:IRHBHC7I","canonical_record":{"source":{"id":"0910.1250","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.chem-ph","submitted_at":"2009-10-07T15:09:47Z","cross_cats_sorted":["cond-mat.soft"],"title_canon_sha256":"0fe862a49e872a4293d4931212f8804edcfb342cf922c551da66bbe493bb3dc0","abstract_canon_sha256":"029fd191a93dba176f614b6ba7869f28d4a460822f1f86e19376b97fac9c2a9a"},"schema_version":"1.0"},"canonical_sha256":"444e138be8377645f5413388f5f1b2577d2a9e810acee640be9f90d2af41f63c","source":{"kind":"arxiv","id":"0910.1250","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0910.1250","created_at":"2026-05-18T04:00:28Z"},{"alias_kind":"arxiv_version","alias_value":"0910.1250v1","created_at":"2026-05-18T04:00:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0910.1250","created_at":"2026-05-18T04:00:28Z"},{"alias_kind":"pith_short_12","alias_value":"IRHBHC7IG53E","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_16","alias_value":"IRHBHC7IG53EL5KB","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_8","alias_value":"IRHBHC7I","created_at":"2026-05-18T12:26:00Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:IRHBHC7IG53EL5KBGOEPL4NSK5","target":"record","payload":{"canonical_record":{"source":{"id":"0910.1250","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.chem-ph","submitted_at":"2009-10-07T15:09:47Z","cross_cats_sorted":["cond-mat.soft"],"title_canon_sha256":"0fe862a49e872a4293d4931212f8804edcfb342cf922c551da66bbe493bb3dc0","abstract_canon_sha256":"029fd191a93dba176f614b6ba7869f28d4a460822f1f86e19376b97fac9c2a9a"},"schema_version":"1.0"},"canonical_sha256":"444e138be8377645f5413388f5f1b2577d2a9e810acee640be9f90d2af41f63c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:00:28.614359Z","signature_b64":"NhUUEK3l1zvPbnzjVxCFpeQdvP5Z2kSR/X3Ae9U5MR6Ded9meEaEUqMddZ0t+95VmlB6JPWR1K9GqPenSQkYBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"444e138be8377645f5413388f5f1b2577d2a9e810acee640be9f90d2af41f63c","last_reissued_at":"2026-05-18T04:00:28.613792Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:00:28.613792Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0910.1250","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":"2026-05-18T04:00:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aR6fhGbiIXXysIXIrVK580peOlWYkEqJ8cFXammVyvQe+1rcL2kWpmxqpQh6WIhUX11kRB9EvTm8/dypKOAkDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T05:52:22.757208Z"},"content_sha256":"72305a46e06f5a81b2f0947a9e13531be291c22ad815e67314f9d70fb0c8db00","schema_version":"1.0","event_id":"sha256:72305a46e06f5a81b2f0947a9e13531be291c22ad815e67314f9d70fb0c8db00"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:IRHBHC7IG53EL5KBGOEPL4NSK5","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Van der Waals density functional: an appropriate exchange functional","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.soft"],"primary_cat":"physics.chem-ph","authors_text":"Valentino R. Cooper","submitted_at":"2009-10-07T15:09:47Z","abstract_excerpt":"In this paper, an exchange functional which is compatible with the non-local Rutgers-Chalmers correlation functional (vdW-DF) is presented. This functional, when employed with vdW-DF, demonstrates remarkable improvements on intermolecular separation distances while further improving the accuracy of vdW-DF interaction energies. The key to the success of this three parameter functional is its reduction of short range exchange repulsion through matching to the gradient exchange approximation in the slowly varying/high density limit while recovering the large reduced gradient, s, limit set in the "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0910.1250","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":"2026-05-18T04:00:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"p5R2oe81U7NAIFbod5M66JnrDpto+YHJdZuE7JVxihQ5jCTDHYTpWic7GvCwJknVVtzK4m69TxcYqkhFydN7Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T05:52:22.757601Z"},"content_sha256":"4787035c39103b68eb4212f3181112b66c739061e02dccdcd0cd73516d2004a8","schema_version":"1.0","event_id":"sha256:4787035c39103b68eb4212f3181112b66c739061e02dccdcd0cd73516d2004a8"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IRHBHC7IG53EL5KBGOEPL4NSK5/bundle.json","state_url":"https://pith.science/pith/IRHBHC7IG53EL5KBGOEPL4NSK5/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IRHBHC7IG53EL5KBGOEPL4NSK5/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":"2026-05-30T05:52:22Z","links":{"resolver":"https://pith.science/pith/IRHBHC7IG53EL5KBGOEPL4NSK5","bundle":"https://pith.science/pith/IRHBHC7IG53EL5KBGOEPL4NSK5/bundle.json","state":"https://pith.science/pith/IRHBHC7IG53EL5KBGOEPL4NSK5/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IRHBHC7IG53EL5KBGOEPL4NSK5/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:IRHBHC7IG53EL5KBGOEPL4NSK5","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":"029fd191a93dba176f614b6ba7869f28d4a460822f1f86e19376b97fac9c2a9a","cross_cats_sorted":["cond-mat.soft"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.chem-ph","submitted_at":"2009-10-07T15:09:47Z","title_canon_sha256":"0fe862a49e872a4293d4931212f8804edcfb342cf922c551da66bbe493bb3dc0"},"schema_version":"1.0","source":{"id":"0910.1250","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0910.1250","created_at":"2026-05-18T04:00:28Z"},{"alias_kind":"arxiv_version","alias_value":"0910.1250v1","created_at":"2026-05-18T04:00:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0910.1250","created_at":"2026-05-18T04:00:28Z"},{"alias_kind":"pith_short_12","alias_value":"IRHBHC7IG53E","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_16","alias_value":"IRHBHC7IG53EL5KB","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_8","alias_value":"IRHBHC7I","created_at":"2026-05-18T12:26:00Z"}],"graph_snapshots":[{"event_id":"sha256:4787035c39103b68eb4212f3181112b66c739061e02dccdcd0cd73516d2004a8","target":"graph","created_at":"2026-05-18T04:00:28Z","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":"In this paper, an exchange functional which is compatible with the non-local Rutgers-Chalmers correlation functional (vdW-DF) is presented. This functional, when employed with vdW-DF, demonstrates remarkable improvements on intermolecular separation distances while further improving the accuracy of vdW-DF interaction energies. The key to the success of this three parameter functional is its reduction of short range exchange repulsion through matching to the gradient exchange approximation in the slowly varying/high density limit while recovering the large reduced gradient, s, limit set in the ","authors_text":"Valentino R. Cooper","cross_cats":["cond-mat.soft"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.chem-ph","submitted_at":"2009-10-07T15:09:47Z","title":"Van der Waals density functional: an appropriate exchange functional"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0910.1250","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":"sha256:72305a46e06f5a81b2f0947a9e13531be291c22ad815e67314f9d70fb0c8db00","target":"record","created_at":"2026-05-18T04:00:28Z","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":"029fd191a93dba176f614b6ba7869f28d4a460822f1f86e19376b97fac9c2a9a","cross_cats_sorted":["cond-mat.soft"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.chem-ph","submitted_at":"2009-10-07T15:09:47Z","title_canon_sha256":"0fe862a49e872a4293d4931212f8804edcfb342cf922c551da66bbe493bb3dc0"},"schema_version":"1.0","source":{"id":"0910.1250","kind":"arxiv","version":1}},"canonical_sha256":"444e138be8377645f5413388f5f1b2577d2a9e810acee640be9f90d2af41f63c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"444e138be8377645f5413388f5f1b2577d2a9e810acee640be9f90d2af41f63c","first_computed_at":"2026-05-18T04:00:28.613792Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:00:28.613792Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"NhUUEK3l1zvPbnzjVxCFpeQdvP5Z2kSR/X3Ae9U5MR6Ded9meEaEUqMddZ0t+95VmlB6JPWR1K9GqPenSQkYBw==","signature_status":"signed_v1","signed_at":"2026-05-18T04:00:28.614359Z","signed_message":"canonical_sha256_bytes"},"source_id":"0910.1250","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:72305a46e06f5a81b2f0947a9e13531be291c22ad815e67314f9d70fb0c8db00","sha256:4787035c39103b68eb4212f3181112b66c739061e02dccdcd0cd73516d2004a8"],"state_sha256":"afd317669b3057e8be2e8f71a177b78d714bf71e6e6ce7f8a02d5811e542ece4"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8YOQSl5Go7EO+6U3hzLmsYjznpw0oIrLHJxO6niy8sGad1pAlIWc3uxvdetJ41pTsIuxWEQT8swrb8OQNP3rDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T05:52:22.759580Z","bundle_sha256":"488b61efca17cd8011068a0135872aafc64a421c31c40a59bf72f440843ebeb3"}}