{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:BMCQUTLXOZBGJ3QYHXEF4LJW3H","short_pith_number":"pith:BMCQUTLX","canonical_record":{"source":{"id":"2608.04806","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2026-08-05T13:12:10Z","cross_cats_sorted":[],"title_canon_sha256":"deb4cd8a80f4b852b672309cae2fb910658dc962e82c514f46d8551270583474","abstract_canon_sha256":"4745b689ff3f8612661477faf3bce1ce6aa2012bf887f3458dcff36c499cda77"},"schema_version":"1.0"},"canonical_sha256":"0b050a4d77764264ee183dc85e2d36d9f9dee578bff66b3d272897cb60865509","source":{"kind":"arxiv","id":"2608.04806","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2608.04806","created_at":"2026-08-06T01:47:13Z"},{"alias_kind":"arxiv_version","alias_value":"2608.04806v1","created_at":"2026-08-06T01:47:13Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2608.04806","created_at":"2026-08-06T01:47:13Z"},{"alias_kind":"pith_short_12","alias_value":"BMCQUTLXOZBG","created_at":"2026-08-06T01:47:13Z"},{"alias_kind":"pith_short_16","alias_value":"BMCQUTLXOZBGJ3QY","created_at":"2026-08-06T01:47:13Z"},{"alias_kind":"pith_short_8","alias_value":"BMCQUTLX","created_at":"2026-08-06T01:47:13Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:BMCQUTLXOZBGJ3QYHXEF4LJW3H","target":"record","payload":{"canonical_record":{"source":{"id":"2608.04806","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2026-08-05T13:12:10Z","cross_cats_sorted":[],"title_canon_sha256":"deb4cd8a80f4b852b672309cae2fb910658dc962e82c514f46d8551270583474","abstract_canon_sha256":"4745b689ff3f8612661477faf3bce1ce6aa2012bf887f3458dcff36c499cda77"},"schema_version":"1.0"},"canonical_sha256":"0b050a4d77764264ee183dc85e2d36d9f9dee578bff66b3d272897cb60865509","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-08-06T01:47:13.899781Z","signature_b64":"pQeilawCV3iQVonM+DmJULjfHFSljESWsAV9gJcJpIcq6yrnridknMqs0pn6jqgn1Dr0BKPba0cdLTW6Gbi4BQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0b050a4d77764264ee183dc85e2d36d9f9dee578bff66b3d272897cb60865509","last_reissued_at":"2026-08-06T01:47:13.898329Z","signature_status":"signed_v1","first_computed_at":"2026-08-06T01:47:13.898329Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2608.04806","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":"2026-08-06T01:47:13Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5OYyBUnQdm62uEb2BO4eZIu1iwY/ppxT3PwnCqiPH3GdHA9RPR8th9ehHwUJg48uRPp7bbqlU8PW8z0RtBQnDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-20T18:11:39.855281Z"},"content_sha256":"32166aacde9677acf69c9fae46478c8de8be716ea654c9d01c48baf2a1e50701","schema_version":"1.0","event_id":"sha256:32166aacde9677acf69c9fae46478c8de8be716ea654c9d01c48baf2a1e50701"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:BMCQUTLXOZBGJ3QYHXEF4LJW3H","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"An Exchange-Correlation Functional for Fast and Accurate Modeling of Ferroelectric Perovskites","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Chiara Gattinoni, Owain T. Beynon","submitted_at":"2026-08-05T13:12:10Z","abstract_excerpt":"We present a novel exchange correlation functional, C09x-PBEc, which combines C09 exchange with PBE correlation, to accurately model the ferroelectric properties of perovskites while retaining the computational efficiency of GGA functionals. With a growing interest in developing machine learning interatomic potentials (MLIPs) to model large-scale ferroelectric systems of technological relevance, it is important to scrutinise the density functional theory exchange-correlation functionals which are used to compute the forces, energies and stresses the MLIP is trained on. Using the example of the"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2608.04806","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/2608.04806/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":"2026-08-06T01:47:13Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BuJSDiVBTErG1f5wNvd+krC0JoF8RzbQ4T0DsXayrF1TTVt7Z3yhmr3dSsdknYHIIP7Rbu307fTjXwEo/6B+BA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-20T18:11:39.855622Z"},"content_sha256":"df294bf67b6b251c612e409a92bda760321f1e68686cea4429793fb1ddb7df75","schema_version":"1.0","event_id":"sha256:df294bf67b6b251c612e409a92bda760321f1e68686cea4429793fb1ddb7df75"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/BMCQUTLXOZBGJ3QYHXEF4LJW3H/bundle.json","state_url":"https://pith.science/pith/BMCQUTLXOZBGJ3QYHXEF4LJW3H/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/BMCQUTLXOZBGJ3QYHXEF4LJW3H/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":"2026-08-20T18:11:39Z","links":{"resolver":"https://pith.science/pith/BMCQUTLXOZBGJ3QYHXEF4LJW3H","bundle":"https://pith.science/pith/BMCQUTLXOZBGJ3QYHXEF4LJW3H/bundle.json","state":"https://pith.science/pith/BMCQUTLXOZBGJ3QYHXEF4LJW3H/state.json","well_known_bundle":"https://pith.science/.well-known/pith/BMCQUTLXOZBGJ3QYHXEF4LJW3H/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:BMCQUTLXOZBGJ3QYHXEF4LJW3H","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":"4745b689ff3f8612661477faf3bce1ce6aa2012bf887f3458dcff36c499cda77","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2026-08-05T13:12:10Z","title_canon_sha256":"deb4cd8a80f4b852b672309cae2fb910658dc962e82c514f46d8551270583474"},"schema_version":"1.0","source":{"id":"2608.04806","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2608.04806","created_at":"2026-08-06T01:47:13Z"},{"alias_kind":"arxiv_version","alias_value":"2608.04806v1","created_at":"2026-08-06T01:47:13Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2608.04806","created_at":"2026-08-06T01:47:13Z"},{"alias_kind":"pith_short_12","alias_value":"BMCQUTLXOZBG","created_at":"2026-08-06T01:47:13Z"},{"alias_kind":"pith_short_16","alias_value":"BMCQUTLXOZBGJ3QY","created_at":"2026-08-06T01:47:13Z"},{"alias_kind":"pith_short_8","alias_value":"BMCQUTLX","created_at":"2026-08-06T01:47:13Z"}],"graph_snapshots":[{"event_id":"sha256:df294bf67b6b251c612e409a92bda760321f1e68686cea4429793fb1ddb7df75","target":"graph","created_at":"2026-08-06T01:47:13Z","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/2608.04806/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present a novel exchange correlation functional, C09x-PBEc, which combines C09 exchange with PBE correlation, to accurately model the ferroelectric properties of perovskites while retaining the computational efficiency of GGA functionals. With a growing interest in developing machine learning interatomic potentials (MLIPs) to model large-scale ferroelectric systems of technological relevance, it is important to scrutinise the density functional theory exchange-correlation functionals which are used to compute the forces, energies and stresses the MLIP is trained on. Using the example of the","authors_text":"Chiara Gattinoni, Owain T. Beynon","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2026-08-05T13:12:10Z","title":"An Exchange-Correlation Functional for Fast and Accurate Modeling of Ferroelectric Perovskites"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2608.04806","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":"sha256:32166aacde9677acf69c9fae46478c8de8be716ea654c9d01c48baf2a1e50701","target":"record","created_at":"2026-08-06T01:47:13Z","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":"4745b689ff3f8612661477faf3bce1ce6aa2012bf887f3458dcff36c499cda77","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2026-08-05T13:12:10Z","title_canon_sha256":"deb4cd8a80f4b852b672309cae2fb910658dc962e82c514f46d8551270583474"},"schema_version":"1.0","source":{"id":"2608.04806","kind":"arxiv","version":1}},"canonical_sha256":"0b050a4d77764264ee183dc85e2d36d9f9dee578bff66b3d272897cb60865509","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0b050a4d77764264ee183dc85e2d36d9f9dee578bff66b3d272897cb60865509","first_computed_at":"2026-08-06T01:47:13.898329Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-08-06T01:47:13.898329Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"pQeilawCV3iQVonM+DmJULjfHFSljESWsAV9gJcJpIcq6yrnridknMqs0pn6jqgn1Dr0BKPba0cdLTW6Gbi4BQ==","signature_status":"signed_v1","signed_at":"2026-08-06T01:47:13.899781Z","signed_message":"canonical_sha256_bytes"},"source_id":"2608.04806","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:32166aacde9677acf69c9fae46478c8de8be716ea654c9d01c48baf2a1e50701","sha256:df294bf67b6b251c612e409a92bda760321f1e68686cea4429793fb1ddb7df75"],"state_sha256":"2e31097e23b234b909031ef89f13daf61f080475363759cd0451d8e11d9f1ccd"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"iuT+LWkxCWY65X03a7GEa8sfNnKe4PoriqsfTZBlpVWsnSKYmdT9eY8xg3mKwv31iIGwIaHovJONHA0X+xc0BQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-20T18:11:39.858569Z","bundle_sha256":"8a8d1b51da6c135dacc78b3b5d5f6fa4f904e3085e98c2210ca4545a171a97b9"}}