{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:4ULWKWPQ3BXVV3RCAAU33ZZSZC","short_pith_number":"pith:4ULWKWPQ","canonical_record":{"source":{"id":"1506.00525","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2015-06-01T15:09:51Z","cross_cats_sorted":[],"title_canon_sha256":"f4b72639039bd0d991bfcd506e21a07b7ebd8631cf239216a596fdba36fc6559","abstract_canon_sha256":"839585608c702aa8879540e61ad1baa6eae9cf8d3a9c75d14e1f0fe32f2bb6b3"},"schema_version":"1.0"},"canonical_sha256":"e5176559f0d86f5aee220029bde732c8922c718d7e3bcef716e73d6dfd0165e7","source":{"kind":"arxiv","id":"1506.00525","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1506.00525","created_at":"2026-05-18T01:20:11Z"},{"alias_kind":"arxiv_version","alias_value":"1506.00525v1","created_at":"2026-05-18T01:20:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1506.00525","created_at":"2026-05-18T01:20:11Z"},{"alias_kind":"pith_short_12","alias_value":"4ULWKWPQ3BXV","created_at":"2026-05-18T12:29:05Z"},{"alias_kind":"pith_short_16","alias_value":"4ULWKWPQ3BXVV3RC","created_at":"2026-05-18T12:29:05Z"},{"alias_kind":"pith_short_8","alias_value":"4ULWKWPQ","created_at":"2026-05-18T12:29:05Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:4ULWKWPQ3BXVV3RCAAU33ZZSZC","target":"record","payload":{"canonical_record":{"source":{"id":"1506.00525","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2015-06-01T15:09:51Z","cross_cats_sorted":[],"title_canon_sha256":"f4b72639039bd0d991bfcd506e21a07b7ebd8631cf239216a596fdba36fc6559","abstract_canon_sha256":"839585608c702aa8879540e61ad1baa6eae9cf8d3a9c75d14e1f0fe32f2bb6b3"},"schema_version":"1.0"},"canonical_sha256":"e5176559f0d86f5aee220029bde732c8922c718d7e3bcef716e73d6dfd0165e7","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:20:11.765191Z","signature_b64":"zxmLnqGfw5LLSnt9zAIk7nzm1+/YmjDk9iwwdP4kiEu2rnt13VL+fp5atIoEc1aMmL2r+jCFkHJv2jlp8miZCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e5176559f0d86f5aee220029bde732c8922c718d7e3bcef716e73d6dfd0165e7","last_reissued_at":"2026-05-18T01:20:11.764722Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:20:11.764722Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1506.00525","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":"2026-05-18T01:20:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"J2cnmrf5AGBBKMVr4XiLdQdccMFZKTtlzFE0Ib4ubvHBjWqe6pJ/IDfZJtOuvFUYonirAAG0o1E2utVaqunoAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-06T23:22:49.044173Z"},"content_sha256":"20f13b7296e6a2b92033c7c21ae5fd352cd9743d9d8c4b64a4cae14ffcb82918","schema_version":"1.0","event_id":"sha256:20f13b7296e6a2b92033c7c21ae5fd352cd9743d9d8c4b64a4cae14ffcb82918"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:4ULWKWPQ3BXVV3RCAAU33ZZSZC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"First principles-based calculation of the electrocaloric effect in BaTiO$_3$: comparison between direct and indirect methods","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Anna Gr\\\"unebohm, Claude Ederer, Madhura Marathe, Peter Entel, Takeshi Nishimatsu","submitted_at":"2015-06-01T15:09:51Z","abstract_excerpt":"We use molecular dynamics simulations for a first principles-based effective Hamiltonian to calculate two important quantities characterizing the electrocaloric effect in BaTiO$_3$, the adiabatic temperature change $\\Delta T$ and the isothermal entropy change $\\Delta S$, for different electric field strengths. We compare direct and indirect methods to obtain $\\Delta T$ and $\\Delta S$, and we confirm that both methods indeed lead to identical result provided that the system does not actually undergo a first order phase transition. We also show that a large electrocaloric response is obtained fo"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1506.00525","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":"2026-05-18T01:20:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ENMErnbRw4BrmMB6hx7wvLXumGYKRjpGGSJNHg48KaxrMnYTIQWvR/FJuezEDgOVCfhLUJouv/oWd/4Chk2zDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-06T23:22:49.044890Z"},"content_sha256":"90620c1a6a475b9a5a689d14125c7d9073d3cadb93a13a87a5ed6efaaf58a6aa","schema_version":"1.0","event_id":"sha256:90620c1a6a475b9a5a689d14125c7d9073d3cadb93a13a87a5ed6efaaf58a6aa"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/4ULWKWPQ3BXVV3RCAAU33ZZSZC/bundle.json","state_url":"https://pith.science/pith/4ULWKWPQ3BXVV3RCAAU33ZZSZC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/4ULWKWPQ3BXVV3RCAAU33ZZSZC/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":"2026-06-06T23:22:49Z","links":{"resolver":"https://pith.science/pith/4ULWKWPQ3BXVV3RCAAU33ZZSZC","bundle":"https://pith.science/pith/4ULWKWPQ3BXVV3RCAAU33ZZSZC/bundle.json","state":"https://pith.science/pith/4ULWKWPQ3BXVV3RCAAU33ZZSZC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/4ULWKWPQ3BXVV3RCAAU33ZZSZC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:4ULWKWPQ3BXVV3RCAAU33ZZSZC","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":"839585608c702aa8879540e61ad1baa6eae9cf8d3a9c75d14e1f0fe32f2bb6b3","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2015-06-01T15:09:51Z","title_canon_sha256":"f4b72639039bd0d991bfcd506e21a07b7ebd8631cf239216a596fdba36fc6559"},"schema_version":"1.0","source":{"id":"1506.00525","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1506.00525","created_at":"2026-05-18T01:20:11Z"},{"alias_kind":"arxiv_version","alias_value":"1506.00525v1","created_at":"2026-05-18T01:20:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1506.00525","created_at":"2026-05-18T01:20:11Z"},{"alias_kind":"pith_short_12","alias_value":"4ULWKWPQ3BXV","created_at":"2026-05-18T12:29:05Z"},{"alias_kind":"pith_short_16","alias_value":"4ULWKWPQ3BXVV3RC","created_at":"2026-05-18T12:29:05Z"},{"alias_kind":"pith_short_8","alias_value":"4ULWKWPQ","created_at":"2026-05-18T12:29:05Z"}],"graph_snapshots":[{"event_id":"sha256:90620c1a6a475b9a5a689d14125c7d9073d3cadb93a13a87a5ed6efaaf58a6aa","target":"graph","created_at":"2026-05-18T01:20:11Z","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":"We use molecular dynamics simulations for a first principles-based effective Hamiltonian to calculate two important quantities characterizing the electrocaloric effect in BaTiO$_3$, the adiabatic temperature change $\\Delta T$ and the isothermal entropy change $\\Delta S$, for different electric field strengths. We compare direct and indirect methods to obtain $\\Delta T$ and $\\Delta S$, and we confirm that both methods indeed lead to identical result provided that the system does not actually undergo a first order phase transition. We also show that a large electrocaloric response is obtained fo","authors_text":"Anna Gr\\\"unebohm, Claude Ederer, Madhura Marathe, Peter Entel, Takeshi Nishimatsu","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2015-06-01T15:09:51Z","title":"First principles-based calculation of the electrocaloric effect in BaTiO$_3$: comparison between direct and indirect methods"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1506.00525","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":"sha256:20f13b7296e6a2b92033c7c21ae5fd352cd9743d9d8c4b64a4cae14ffcb82918","target":"record","created_at":"2026-05-18T01:20:11Z","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":"839585608c702aa8879540e61ad1baa6eae9cf8d3a9c75d14e1f0fe32f2bb6b3","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2015-06-01T15:09:51Z","title_canon_sha256":"f4b72639039bd0d991bfcd506e21a07b7ebd8631cf239216a596fdba36fc6559"},"schema_version":"1.0","source":{"id":"1506.00525","kind":"arxiv","version":1}},"canonical_sha256":"e5176559f0d86f5aee220029bde732c8922c718d7e3bcef716e73d6dfd0165e7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e5176559f0d86f5aee220029bde732c8922c718d7e3bcef716e73d6dfd0165e7","first_computed_at":"2026-05-18T01:20:11.764722Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:20:11.764722Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"zxmLnqGfw5LLSnt9zAIk7nzm1+/YmjDk9iwwdP4kiEu2rnt13VL+fp5atIoEc1aMmL2r+jCFkHJv2jlp8miZCA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:20:11.765191Z","signed_message":"canonical_sha256_bytes"},"source_id":"1506.00525","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:20f13b7296e6a2b92033c7c21ae5fd352cd9743d9d8c4b64a4cae14ffcb82918","sha256:90620c1a6a475b9a5a689d14125c7d9073d3cadb93a13a87a5ed6efaaf58a6aa"],"state_sha256":"341ba281af47eff6ab606edb55fccf6a0fd547135ba4fc7aa87c8767fa645175"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"sjUeSxMK2WHB0g0rdNuFcH0U7VrwQz3jMl4D/NAebAZCAbQoiYVGmhBiHrR1EEexGFadUSFPkc8ECBGrZy96AA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-06T23:22:49.048941Z","bundle_sha256":"ab7f370e469fb7626c320547633575be70b34abe3fa4e6295c82ca1dfc3eb7a0"}}