{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:KRBH4ORVAEZMLYXLGXNHX3X5NF","short_pith_number":"pith:KRBH4ORV","canonical_record":{"source":{"id":"2507.23369","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2025-07-31T09:33:01Z","cross_cats_sorted":[],"title_canon_sha256":"79ab38a8224b414194691c7bf31f771ff490f9b0a15c03719a2e749baf5b85fc","abstract_canon_sha256":"7f28737e74f10e358d2fc08fae909eb87ef89b1465f5c770a38736ab02a3341a"},"schema_version":"1.0"},"canonical_sha256":"54427e3a350132c5e2eb35da7beefd695d62e1e875a699aa8bed27e057815553","source":{"kind":"arxiv","id":"2507.23369","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2507.23369","created_at":"2026-07-05T11:46:10Z"},{"alias_kind":"arxiv_version","alias_value":"2507.23369v1","created_at":"2026-07-05T11:46:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2507.23369","created_at":"2026-07-05T11:46:10Z"},{"alias_kind":"pith_short_12","alias_value":"KRBH4ORVAEZM","created_at":"2026-07-05T11:46:10Z"},{"alias_kind":"pith_short_16","alias_value":"KRBH4ORVAEZMLYXL","created_at":"2026-07-05T11:46:10Z"},{"alias_kind":"pith_short_8","alias_value":"KRBH4ORV","created_at":"2026-07-05T11:46:10Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:KRBH4ORVAEZMLYXLGXNHX3X5NF","target":"record","payload":{"canonical_record":{"source":{"id":"2507.23369","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2025-07-31T09:33:01Z","cross_cats_sorted":[],"title_canon_sha256":"79ab38a8224b414194691c7bf31f771ff490f9b0a15c03719a2e749baf5b85fc","abstract_canon_sha256":"7f28737e74f10e358d2fc08fae909eb87ef89b1465f5c770a38736ab02a3341a"},"schema_version":"1.0"},"canonical_sha256":"54427e3a350132c5e2eb35da7beefd695d62e1e875a699aa8bed27e057815553","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T11:46:10.870695Z","signature_b64":"OwR6To03d6+KCaGTzPuP9YPqnDywcArll/qtVoJV1bRtLM/lJY+aFu1w/OeLytlIwJUHrKBu+m7k1qtm+XDTDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"54427e3a350132c5e2eb35da7beefd695d62e1e875a699aa8bed27e057815553","last_reissued_at":"2026-07-05T11:46:10.870221Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T11:46:10.870221Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2507.23369","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":"2026-07-05T11:46:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"G7zU/ezYP7+SsO6HAkw2LHbKLUxHxLpfP+S462yVTysrJLbl3/dq23gJffxDuqqEt2XpXxV4jIBfrdV8zmcQBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-08T03:34:32.620274Z"},"content_sha256":"b682243ddf9b75cdc7e5736255cb5bd9c7e877c52c42df50624566fe10e71059","schema_version":"1.0","event_id":"sha256:b682243ddf9b75cdc7e5736255cb5bd9c7e877c52c42df50624566fe10e71059"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:KRBH4ORVAEZMLYXLGXNHX3X5NF","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Machine learning Landau free energy potentials","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Hugo Aramberri, Jorge \\'I\\~niguez-Gonz\\'alez, Mauro Pulzone, Natalya S. Fedorova","submitted_at":"2025-07-31T09:33:01Z","abstract_excerpt":"We show how to construct Landau-like free energy potentials using a machine-learning approach. For concreteness, we focus on perovskite oxide PbTiO$_{3}$. We work with a training set obtained from Monte Carlo simulations based on an atomistic ''second-principles'' potential for PbTiO$_{3}$. We rely exclusively on data that would be experimentally accessible -- i.e., temperature-dependent polarization and strain, both with and without external electric fields and stresses applied --, to explore scenarios where the training set could be obtained from laboratory measurements. We introduce a schem"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2507.23369","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/2507.23369/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":"2026-07-05T11:46:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fGQQajB3XZ77xetrJoei+2s33aZ9AUC4+jQxqMiT3cqAb23lNr4NQoUMr6T+akvVhV01yVdgqHOES7W5x15QAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-08T03:34:32.620767Z"},"content_sha256":"de57331c91e6fbfb815ade2a68626540728e1ee5af54d98b5d370c1d3fafb8f8","schema_version":"1.0","event_id":"sha256:de57331c91e6fbfb815ade2a68626540728e1ee5af54d98b5d370c1d3fafb8f8"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/KRBH4ORVAEZMLYXLGXNHX3X5NF/bundle.json","state_url":"https://pith.science/pith/KRBH4ORVAEZMLYXLGXNHX3X5NF/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/KRBH4ORVAEZMLYXLGXNHX3X5NF/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":"2026-08-08T03:34:32Z","links":{"resolver":"https://pith.science/pith/KRBH4ORVAEZMLYXLGXNHX3X5NF","bundle":"https://pith.science/pith/KRBH4ORVAEZMLYXLGXNHX3X5NF/bundle.json","state":"https://pith.science/pith/KRBH4ORVAEZMLYXLGXNHX3X5NF/state.json","well_known_bundle":"https://pith.science/.well-known/pith/KRBH4ORVAEZMLYXLGXNHX3X5NF/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:KRBH4ORVAEZMLYXLGXNHX3X5NF","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":"7f28737e74f10e358d2fc08fae909eb87ef89b1465f5c770a38736ab02a3341a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2025-07-31T09:33:01Z","title_canon_sha256":"79ab38a8224b414194691c7bf31f771ff490f9b0a15c03719a2e749baf5b85fc"},"schema_version":"1.0","source":{"id":"2507.23369","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2507.23369","created_at":"2026-07-05T11:46:10Z"},{"alias_kind":"arxiv_version","alias_value":"2507.23369v1","created_at":"2026-07-05T11:46:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2507.23369","created_at":"2026-07-05T11:46:10Z"},{"alias_kind":"pith_short_12","alias_value":"KRBH4ORVAEZM","created_at":"2026-07-05T11:46:10Z"},{"alias_kind":"pith_short_16","alias_value":"KRBH4ORVAEZMLYXL","created_at":"2026-07-05T11:46:10Z"},{"alias_kind":"pith_short_8","alias_value":"KRBH4ORV","created_at":"2026-07-05T11:46:10Z"}],"graph_snapshots":[{"event_id":"sha256:de57331c91e6fbfb815ade2a68626540728e1ee5af54d98b5d370c1d3fafb8f8","target":"graph","created_at":"2026-07-05T11:46:10Z","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/2507.23369/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We show how to construct Landau-like free energy potentials using a machine-learning approach. For concreteness, we focus on perovskite oxide PbTiO$_{3}$. We work with a training set obtained from Monte Carlo simulations based on an atomistic ''second-principles'' potential for PbTiO$_{3}$. We rely exclusively on data that would be experimentally accessible -- i.e., temperature-dependent polarization and strain, both with and without external electric fields and stresses applied --, to explore scenarios where the training set could be obtained from laboratory measurements. We introduce a schem","authors_text":"Hugo Aramberri, Jorge \\'I\\~niguez-Gonz\\'alez, Mauro Pulzone, Natalya S. Fedorova","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2025-07-31T09:33:01Z","title":"Machine learning Landau free energy potentials"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2507.23369","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:b682243ddf9b75cdc7e5736255cb5bd9c7e877c52c42df50624566fe10e71059","target":"record","created_at":"2026-07-05T11:46:10Z","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":"7f28737e74f10e358d2fc08fae909eb87ef89b1465f5c770a38736ab02a3341a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2025-07-31T09:33:01Z","title_canon_sha256":"79ab38a8224b414194691c7bf31f771ff490f9b0a15c03719a2e749baf5b85fc"},"schema_version":"1.0","source":{"id":"2507.23369","kind":"arxiv","version":1}},"canonical_sha256":"54427e3a350132c5e2eb35da7beefd695d62e1e875a699aa8bed27e057815553","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"54427e3a350132c5e2eb35da7beefd695d62e1e875a699aa8bed27e057815553","first_computed_at":"2026-07-05T11:46:10.870221Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:46:10.870221Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"OwR6To03d6+KCaGTzPuP9YPqnDywcArll/qtVoJV1bRtLM/lJY+aFu1w/OeLytlIwJUHrKBu+m7k1qtm+XDTDw==","signature_status":"signed_v1","signed_at":"2026-07-05T11:46:10.870695Z","signed_message":"canonical_sha256_bytes"},"source_id":"2507.23369","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b682243ddf9b75cdc7e5736255cb5bd9c7e877c52c42df50624566fe10e71059","sha256:de57331c91e6fbfb815ade2a68626540728e1ee5af54d98b5d370c1d3fafb8f8"],"state_sha256":"98c9bf4a972125c69b144c3de5a1060068f64ee57a5cefd5b3126d5294ebc92d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ba66S+FzHbQRJo12LfCrDS6J9+vh5LE3hhs+755MmhFa/Lm5B5vGnnHQlIBplz3JAX0tH8esJ2X9HkByA2XqDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-08T03:34:32.624640Z","bundle_sha256":"078200753da3aca897d1006a0f90b5c6f4465aa57f4b7f3c487e5d5edd94e421"}}